PROSPERITY BANCSHARES INC - Quarter Report: 2017 September (Form 10-Q)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

☒	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2017

☐	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE TRANSITION PERIOD FROM TO

COMMISSION FILE NUMBER: 001-35388

PROSPERITY BANCSHARES, INC.^®

(Exact name of registrant as specified in its charter)

TEXAS

74-2331986

(State or other jurisdiction

of incorporation or organization)

(I.R.S. Employer

Identification No.)

Prosperity Bank Plaza
4295 San Felipe, Houston, Texas	77027
(Address of principal executive offices)	(Zip Code)

(281) 269-7199

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See definitions of “accelerated filer”, “large accelerated filer”, “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act:

Large Accelerated Filer	☒		Accelerated Filer	☐

Non-accelerated Filer	☐	(Do not check if a smaller reporting company)	Smaller Reporting Company	☐

			Emerging Growth Company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

As of November 2, 2017, there were 69,484,012 outstanding shares of the registrant’s Common Stock, par value $1.00 per share.

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

INDEX TO FORM 10-Q

PART I—FINANCIAL INFORMATION

Item 1.	Financial Statements	3
	Consolidated Balance Sheets as of September 30, 2017 and December 31, 2016 (unaudited)	3
	Consolidated Statements of Income for the Three and Nine Months Ended September 30, 2017 and 2016 (unaudited)	4
	Consolidated Statements of Comprehensive Income for the Three and Nine Months Ended September 30, 2017 and 2016 (unaudited)	5
	Consolidated Statements of Changes in Shareholders’ Equity for the Nine Months Ended September 30, 2017 and 2016 (unaudited)	6
	Consolidated Statements of Cash Flows for the Nine Months Ended September 30, 2017 and 2016 (unaudited)	7
	Notes to Consolidated Financial Statements (unaudited)	8
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	34
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	55
Item 4.	Controls and Procedures	55

PART II—OTHER INFORMATION

Item 1.	Legal Proceedings	56
Item 1A.	Risk Factors	56
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	56
Item 3.	Defaults upon Senior Securities	56
Item 4.	Mine Safety Disclosures	56
Item 5.	Other Information	56
Item 6.	Exhibits	57
Signatures		58

PART I—FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(UNAUDITED)

	September 30,			December 31,
	2017			2016
	(Dollars in thousands, except par value)
ASSETS
Cash and due from banks	$	302,469		$	436,203
Federal funds sold		1,007			1,178
Total cash and cash equivalents		303,476			437,381
Available for sale securities, at fair value		233,651			221,176
Held to maturity securities, at cost (fair value of $9,154,725 and $9,339,455, respectively)		9,176,871			9,504,910
Total securities		9,410,522			9,726,086
Loans held for sale		25,473			26,975
Loans held for investment		9,885,729			9,595,085
Total loans		9,911,202			9,622,060
Less: allowance for credit losses		(86,812	)		(85,326	)
Loans, net		9,824,390			9,536,734
Accrued interest receivable		52,532			53,310
Goodwill		1,900,845			1,900,845
Core deposit intangibles, net		40,464			45,784
Bank premises and equipment, net		256,011			262,083
Other real estate owned		14,512			15,463
Bank owned life insurance (BOLI)		253,751			247,116
Federal Home Loan Bank of Dallas stock		61,815			55,430
Other assets		24,945			50,840
TOTAL ASSETS	$	22,143,263		$	22,331,072
LIABILITIES AND SHAREHOLDERS’ EQUITY
LIABILITIES:
Deposits:
Noninterest-bearing	$	5,465,474		$	5,190,973
Interest-bearing		11,442,002			12,116,329
Total deposits		16,907,476			17,307,302
Other borrowings		960,365			990,781
Securities sold under repurchase agreements		334,621			320,430
Accrued interest payable		3,121			2,319
Other liabilities		156,322			67,929
Total liabilities		18,361,905			18,688,761
COMMITMENTS AND CONTINGENCIES		—			—
SHAREHOLDERS’ EQUITY:
Preferred stock, $1 par value; 20,000,000 shares authorized; none issued or outstanding		—			—
Common stock, $1 par value; 200,000,000 shares authorized; 69,484,012 shares issued and outstanding at September 30, 2017; 69,491,012 shares issued and outstanding at December 31, 2016		69,484			69,491
Capital surplus		2,033,379			2,028,129
Retained earnings		1,677,432			1,543,280
Accumulated other comprehensive income—net unrealized gain on available for sale securities, net of tax of $572 and $760, respectively		1,063			1,411
Total shareholders’ equity		3,781,358			3,642,311
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$	22,143,263		$	22,331,072

See notes to consolidated financial statements.

PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME

(UNAUDITED)

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2017			2016		2017			2016
	(Dollars in thousands, except per share data)
INTEREST INCOME:
Loans, including fees	$	121,567		$	116,247	$	348,252		$	359,066
Securities		50,610			48,132		156,679			151,802
Federal funds sold		242			81		585			242
Total interest income		172,419			164,460		505,516			511,110
INTEREST EXPENSE:
Deposits		12,376			9,396		33,725			29,647
Other borrowings		3,540			752		10,056			1,944
Securities sold under repurchase agreements		356			248		922			694
Junior subordinated debentures		—			—		—			37
Total interest expense		16,272			10,396		44,703			32,322
NET INTEREST INCOME		156,147			154,064		460,813			478,788
PROVISION FOR CREDIT LOSSES		6,900			2,000		12,325			22,000
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES		149,247			152,064		448,488			456,788
NONINTEREST INCOME:
Nonsufficient funds (NSF) fees		8,350			8,764		24,244			24,984
Credit card, debit card and ATM card income		6,075			5,903		18,214			17,659
Service charges on deposit accounts		5,251			4,698		16,077			13,898
Trust income		2,040			1,851		6,466			5,640
Mortgage income		854			2,143		3,227			5,386
Brokerage income		461			1,213		1,376			3,789
Net gain (loss) on sale of assets		62			37		(1,962	)		1,389
Gain on sale of securities		—			—		3,270			—
Other		5,716			5,075		16,501			16,205
Total noninterest income		28,809			29,684		87,413			88,950
NONINTEREST EXPENSE:
Salaries and employee benefits		47,866			48,328		143,653			146,666
Net occupancy and equipment		5,691			5,997		16,654			17,362
Credit and debit card, data processing and software amortization		4,506			4,207		12,807			12,801
Regulatory assessments and FDIC insurance		3,455			3,434		10,552			10,311
Core deposit intangibles amortization		1,686			2,418		5,320			6,974
Depreciation		3,050			3,289		9,204			9,924
Communications		2,618			2,870		7,984			8,790
Other real estate expense		(30	)		44		112			136
Other		8,667			8,889		25,727			26,275
Total noninterest expense		77,509			79,476		232,013			239,239
INCOME BEFORE INCOME TAXES		100,547			102,272		303,888			306,499
PROVISION FOR INCOME TAXES		32,639			33,621		98,861			100,826
NET INCOME	$	67,908		$	68,651	$	205,027		$	205,673
EARNINGS PER SHARE:
Basic	$	0.98		$	0.99	$	2.95		$	2.95
Diluted	$	0.98		$	0.99	$	2.95		$	2.95

See notes to consolidated financial statements.

PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(UNAUDITED)

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2017			2016			2017			2016
	(Dollars in thousands)
Net income	$	67,908		$	68,651		$	205,027		$	205,673
Other comprehensive loss, before tax:
Securities available for sale:
Change in unrealized gain during period		(1,236	)		(186	)		(536	)		(828	)
Total other comprehensive loss		(1,236	)		(186	)		(536	)		(828	)
Deferred tax benefit related to other comprehensive loss		433			65			188			290
Other comprehensive loss, net of tax		(803	)		(121	)		(348	)		(538	)
Comprehensive income	$	67,105		$	68,530		$	204,679		$	205,135

See notes to consolidated financial statements.

PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY

(UNAUDITED)

													Accumulated
													Other						Total
	Common Stock						Capital			Retained			Comprehensive			Treasury			Shareholders’
	Shares			Amount			Surplus			Earnings			Income			Stock			Equity
	(In thousands, except share and per share data)
BALANCE AT DECEMBER 31, 2015		70,058,761		$	70,059		$	2,036,378		$	1,355,040		$	2,040		$	(607	)	$	3,462,910
Net income											205,673									205,673
Other comprehensive income														(538	)					(538	)
Common stock issued in connection with the exercise of stock options and restricted stock awards, net		21,267			21			646												667
Common stock issued in connection with the acquisition of Tradition Bancshares, Inc.		679,528			679			31,843												32,522
Treasury stock cancellation		(37,088	)		(37	)		(570	)								607		—
Common stock repurchase		(1,244,890	)		(1,245	)		(49,812	)											(51,057	)
Stock based compensation expense								7,237												7,237
Cash dividends declared, $0.9000 per share											(62,602	)								(62,602	)
BALANCE AT SEPTEMBER 30, 2016		69,477,578		$	69,477		$	2,025,722		$	1,498,111		$	1,502		$	—		$	3,594,812

BALANCE AT DECEMBER 31, 2016		69,491,012		$	69,491		$	2,028,129		$	1,543,280		$	1,411		$	—		$	3,642,311
Net income											205,027									205,027
Other comprehensive loss														(348	)					(348	)
Common stock issued in connection with the exercise of stock options and restricted stock awards, net		(7,000	)		(7	)		155												148
Stock based compensation expense								5,095												5,095
Cash dividends declared, $1.0200 per share											(70,875	)								(70,875	)
BALANCE AT SEPTEMBER 30, 2017		69,484,012		$	69,484		$	2,033,379		$	1,677,432		$	1,063		$	—		$	3,781,358

See notes to consolidated financial statements.

PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

(UNAUDITED)

	Nine Months Ended
	September 30,
	2017			2016
	(Dollars in thousands)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$	205,027		$	205,673
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and core deposit intangibles amortization		14,524			16,898
Provision for credit losses		12,325			22,000
Net amortization of premium on investments		29,401			31,972
Net (gain) loss on sale of other real estate		(221	)		330
Gain on sale of investment securities		(3,270	)		—
Net loss (gain) on sale of assets		1,962			(1,389	)
Net accretion of discount on loans		(17,110	)		(31,418	)
Net amortization of premium on deposits		(178	)		(935	)
Gain on sale of loans		(3,007	)		(4,910	)
Proceeds from sale of loans held for sale		151,645			205,137
Originations of loans held for sale		(148,297	)		(208,095	)
Stock based compensation expense		5,095			7,237
Decrease in accrued interest receivable and other assets		9,307			63,096
Increase in accrued interest payable and other liabilities		89,195			46,744
Net cash provided by operating activities		346,398			352,340

CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities and principal paydowns of held to maturity securities		1,367,648			1,410,155
Purchase of held to maturity securities		(1,065,091	)		(655,865	)
Proceeds from maturities and principal paydowns of available for sale securities		7,239,733			8,123,458
Purchase of available for sale securities		(7,253,393	)		(8,151,073	)
Net (increase) decrease in loans held for investment		(284,836	)		135,818
Purchase of bank premises and equipment		(6,643	)		(3,933	)
Proceeds from sale of bank premises, equipment and other real estate		8,879			7,206
Net cash used in the purchase of Tradition Bancshares, Inc.		—			(8,963	)
Net cash provided by investing activities		6,297			856,803

CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase (decrease) in noninterest-bearing deposits		274,501			(287,225	)
Net decrease in interest-bearing deposits		(674,149	)		(961,271	)
Net repayments of other short-term borrowings		(30,000	)		(65,000	)
Repayments of other long-term borrowings		(416	)		(483	)
Net increase in securities sold under repurchase agreements		14,191			3,196
Redemption of junior subordinated debentures		—			(7,217	)
Proceeds from stock option exercises		148			667
Repurchase of common stock		—			(51,057	)
Payments of cash dividends		(70,875	)		(62,602	)
Net cash used in financing activities		(486,600	)		(1,430,992	)
NET DECREASE IN CASH AND CASH EQUIVALENTS		(133,905	)		(221,849	)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD		437,381			563,962
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	303,476		$	342,113

NONCASH ACTIVITIES:
Stock issued in connection with the Tradition Bancshares, Inc. acquisition	$	—		$	32,522
Acquisition of real estate through foreclosure of collateral		1,483			14,583

SUPPLEMENTAL INFORMATION:
Income taxes paid	$	64,150		$	83,275
Interest paid		43,901			30,722

See notes to consolidated financial statements.

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

1. BASIS OF PRESENTATION

The consolidated financial statements include the accounts of Prosperity Bancshares, Inc.^® (“Bancshares”) and its wholly-owned subsidiary, Prosperity Bank^® (the “Bank,” and together with Bancshares, the “Company”). All intercompany transactions and balances have been eliminated.

The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for financial information and with the rules and regulations of the Securities and Exchange Commission. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, the statements reflect all adjustments necessary for a fair presentation of the financial position, results of operations and cash flows of the Company on a consolidated basis; and all such adjustments are of a normal recurring nature. These financial statements and the notes thereto should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2016. Operating results for the nine-month period ended September 30, 2017 are not necessarily indicative of the results that may be expected for the year ending December 31, 2017 or any other period.

2. INCOME PER COMMON SHARE

Outstanding stock options issued by the Company represent the only dilutive effect reflected in diluted weighted average shares.

The following table illustrates the computation of basic and diluted earnings per share:

	Three Months Ended September 30,								Nine Months Ended September 30,
	2017				2016				2017				2016
	Amount		Per Share Amount		Amount		Per Share Amount		Amount		Per Share Amount		Amount		Per Share Amount
	(Amounts in thousands, except per share data)
Net income	$	67,908			$	68,651			$	205,027			$	205,673
Basic:
Weighted average shares outstanding		69,485	$	0.98		69,478	$	0.99		69,484	$	2.95		69,738	$	2.95
Diluted:
Add incremental shares for:
Effect of dilutive securities - options		—				6				1				7
Total		69,485	$	0.98		69,484	$	0.99		69,485	$	2.95		69,745	$	2.95

There were no stock options exercisable during the three and nine months ended September 30, 2017 or 2016 that would have had an anti-dilutive effect on the above computation.

3. NEW ACCOUNTING STANDARDS

Accounting Standards Updates (“ASU”)

ASU 2017-09, “Compensation—Stock Compensation (Topic 718).” ASU 2017-09 clarifies when changes to the terms or conditions of a share-based payment award must be accounted for as modifications. Under the amendments in this update, an entity should account for changes to the terms or conditions of a share-based payment as a modification unless all of the following are met: 1) the fair value of the modified award is the same as the fair value of the original award immediately before modification, 2) the vesting conditions of the modified award are the same as the vesting conditions of the original award immediately before modification and 3) the classification of the modified award as an equity instrument or a liability instrument is the same as the classification of the original award immediately before modification. ASU 2017-09 will be effective for the Company on January 1, 2018 and is not expected to have a significant impact on the Company’s financial statements.

ASU 2017-08, “Receivables—Nonrefundable Fees and Other Costs (Subtopic 310-20).” ASU 2017-08 shortens the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. ASU 2017-08 will be effective for the Company on January 1, 2019 on a modified retrospective

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

basis with a cumulative-effect adjustment as of the beginning of the period of adoption and is not expected to have a significant impact on the Company’s financial statements.

ASU 2017-04, “Intangibles—Goodwill and Other (Topic 350).” ASU 2017-04 simplifies the subsequent measurement of goodwill by eliminating the second step of the goodwill impairment test, which required computing the implied fair value of goodwill. Under the amendments in this update, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. ASU 2017-04 will be effective for the Company on January 1, 2020 and is not expected to have a significant impact on the Company’s financial statements.

ASU 2017-01, “Business Combinations (Topic 805).” ASU 2017-01 is intended to clarify or correct unintended application of ASU 2014-09 “Revenue from Contracts with Customers (Topic 606).” ASU 2017-01 clarifies the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. Additionally, the amendments in this update provide a more robust framework to assist entities in evaluating whether a set of assets and activities constitutes a business. Lastly, the amendments in this update narrow the definition of the term output so that the term is consistent with how outputs are described in Topic 606. ASU 2017-01 will be effective for the Company on January 1, 2018 and is not expected to have a significant impact on the Company’s financial statements.

ASU 2016-18, “Statement of Cash Flows (Topic 230)—Restricted Cash.” ASU 2016-18 requires the Statement of Cash Flows to explain the change during the period in the total of cash, cash equivalents and amounts generally described as restricted cash or restricted cash equivalents. Therefore, restricted cash or cash equivalents should be included with cash and cash equivalents when recording the beginning-of-period and end-of-period total amounts on the Statement of Cash Flows. ASU 2016-18 will be effective for the Company on January 1, 2018 and is not expected to have a significant impact on the Company’s financial statements.

ASU 2016-15, “Statement of Cash Flows (Topic 230)—Classification of Certain Cash Receipts and Cash Payments.” ASU 2016-15 addresses certain cash receipts and cash payments with the objective of reducing the existing diversity in practice. ASU 2016‑15 will be effective for the Company on January 1, 2018 and is not expected to have a significant impact on the Company's financial statements.

ASU 2016-13, “Financial Instruments – Credit Losses (Topic 326)—Measurement of Credit Losses on Financial Instruments.” ASU 2016-13 requires a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. An entity must use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances. Additionally, available for sale debt securities may realize value either through collection of contractual cash flows or through sale of the security at fair value. Therefore, the amendments limit the amount of the allowance for credit losses to the difference between amortized cost and fair value. ASU 2016-13 will be effective for the Company as of January 1, 2020. The Company is currently evaluating the potential impact of ASU 2016-13 on the Company’s financial statements.

ASU 2016-09, “Compensation - Stock Compensation (Topic 718)—Improvements to Employee Share-Based Payment Accounting.” ASU 2016-09 simplifies the accounting for share-based awards paid to employees. The amended guidance 1) requires excess tax benefits and tax deficiencies on share-based awards payments to employees to be recognized directly to income tax expense or benefit in the Consolidated Statement of Income rather than to capital surplus; 2) requires excess tax benefits to be included as operating activities on the Consolidated Statements of Cash Flows; 3) provides entities with the option of making an accounting policy election to account for forfeitures of share-based payments as they occur instead of estimating the awards expected to be forfeited; and 4) changes the threshold to qualify for equity classification to permit withholdings up to the maximum statutory tax rate in the applicable jurisdiction. In addition, excess tax benefits and tax deficiencies are considered discrete items in the reporting period they occur and are not included in the estimate of an entity’s annual effective tax rate. The Company adopted ASU 2016-09 on January 1, 2017 and elected to recognize forfeitures as they occur. Implementation of ASU 2016-09 will add volatility to tax expense as the Company’s stock price changes. The adoption of ASU 2016-09 did not have a significant impact on the Company’s financial statements.

ASU 2016-02, "Leases (Topic 842)." ASU 2016-02 requires that lessees and lessors recognize lease assets and lease liabilities on the balance sheet and disclose key information about leasing arrangements. ASU 2016-02 is effective for public companies for

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

annual periods beginning January 1, 2019, including interim periods within those fiscal years. The Company is currently evaluating the potential impact of ASU 2016-02 on the Company’s financial statements.

ASU 2016-01, “Financial Instruments—Overall (Subtopic 825-10)—Recognition and Measurement of Financial Assets and Financial Liabilities.” ASU 2016-01 addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. ASU 2016-01 1) requires equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income; 2) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment; 3) eliminates the requirement to disclose the fair value of financial instruments measured at amortized cost for entities that are not public business entities; 4) eliminates the requirement for public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; 5) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; 6) requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; 7) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (that is, securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; and 8) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity’s other deferred tax assets. The amendments in this update affect all entities that hold financial assets or owe financial liabilities. ASU 2016-01 is effective for the Company beginning January 1, 2018, and is not expected to have a significant impact on the Company’s financial statements.

ASU 2014-09, “Revenue from Contracts with Customers (Topic 606).” ASU 2014-09 supersedes the revenue recognition requirements in Revenue Recognition (Topic 605), and most industry-specific guidance throughout the Industry Topics of the Codification. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In addition, the FASB has issued targeted updates to clarify specific implementation issues of ASU 2014-09. These updates include ASU 2016-08 - Principal versus Agent Considerations (Reporting Revenue Gross versus Net), ASU 2016-10 - Identifying Performance Obligations and Licensing, ASU 2016-12 - Narrow-Scope Improvements and Practical Expedients and ASU 2016-20 - Technical Corrections and Improvements to Topic 606 - Revenue from Contract with Customers. These amendments do not change the core principles in ASU 2014-09. The Company’s primary sources of revenue are comprised of net interest income on financial assets and liabilities, which are not within the scope of ASU 2014-09. The Company continues to evaluate the complete effect of ASU 2014-09, but it is not expected to have a significant impact on the Company’s financial statements. The Company will adopt ASU 2014-09, effective January 1, 2018, using the modified retrospective application with a cumulative-effect adjustment, if such adjustment is significant.

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

4. SECURITIES

The amortized cost and fair value of investment securities were as follows:

	September 30, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(Dollars in thousands)
Available for Sale
States and political subdivisions	$	1,816	$	4	$	—		$	1,820
Collateralized mortgage obligations		104,976		187		(55	)		105,108
Mortgage-backed securities		112,636		1,491		(35	)		114,092
Other securities		12,588		126		(83	)		12,631
Total	$	232,016	$	1,808	$	(173	)	$	233,651
Held to Maturity
U.S. Treasury securities and obligations of U.S. Government agencies	$	32,177	$	432	$	—		$	32,609
States and political subdivisions		331,293		6,281		(31	)		337,543
Collateralized mortgage obligations		697		6		(3	)		700
Mortgage-backed securities		8,812,704		40,648		(69,479	)		8,783,873
Other securities		—		—		—			—
Total	$	9,176,871	$	47,367	$	(69,513	)	$	9,154,725

	December 31, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(Dollars in thousands)
Available for Sale
States and political subdivisions	$	1,915	$	5	$	—		$	1,920
Collateralized mortgage obligations		120,478		240		(119	)		120,599
Mortgage-backed securities		84,024		2,004		(165	)		85,863
Other securities		12,588		252		(46	)		12,794
Total	$	219,005	$	2,501	$	(330	)	$	221,176
Held to Maturity
U.S. Treasury securities and obligations of U.S. Government agencies	$	33,523	$	497	$	—		$	34,020
States and political subdivisions		384,015		3,934		(1,328	)		386,621
Collateralized mortgage obligations		850		6		(5	)		851
Mortgage-backed securities		9,086,422		30,880		(199,439	)		8,917,863
Other securities		100		—		—			100
Total	$	9,504,910	$	35,317	$	(200,772	)	$	9,339,455

Management evaluates securities for other-than-temporary impairment (“OTTI”) at least on a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. The investment securities portfolio is evaluated for OTTI by segregating the portfolio into two general segments and applying the appropriate OTTI analysis. Investment securities classified as available for sale or held to maturity are evaluated for OTTI under Financial Accounting Standards Board (“FASB”): Accounting Standards Codification (“ASC”) Topic 320, “Investments-Debt and Equity Securities.”

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

In determining OTTI, management considers many factors, including: (1) the length of time and the extent to which the fair value has been less than cost, (2) the financial condition and near-term prospects of the issuer, (3) whether the market decline was affected by macroeconomic conditions and (4) whether the entity has the intent to sell the debt security or more likely than not will be required to sell the debt security before its anticipated recovery. The assessment of whether an other-than-temporary decline exists involves a high degree of subjectivity and judgment and is based on the information available to management at the time of such determination.

When OTTI occurs, the amount of the OTTI recognized in earnings depends on whether an entity intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss. If an entity intends to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss, the OTTI will be recognized in earnings equal to the entire difference between the investment’s amortized cost basis and its fair value at the balance sheet date. If an entity does not intend to sell the security and it is not more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis less any current-period loss, the OTTI will be separated into the amount representing the credit-related portion of the impairment loss (“credit loss”) and the noncredit portion of the impairment loss (“noncredit portion”). The amount of the total OTTI related to the credit loss is determined based on the difference between the present value of cash flows expected to be collected and the amortized cost basis and such difference is recognized in earnings. The amount of the total OTTI related to the noncredit portion is recognized in other comprehensive income, net of applicable taxes. The previous amortized cost basis less the OTTI recognized in earnings will become the new amortized cost basis of the investment.

Management has the ability and intent to hold the securities classified as held-to-maturity until they mature, at which time the Company will receive full value for the securities. Furthermore, as of September 30, 2017, management does not have the intent to sell any of the securities classified as available for sale before a recovery of cost. In addition, management believes it is more likely than not that the Company will not be required to sell any of its investment securities before a recovery of cost. The unrealized losses are largely due to increases in market interest rates over the yields available at the time the underlying securities were purchased. The fair value is expected to recover as the securities approach their maturity date or repricing date or if market yields for such investments decline. Management does not believe any of the securities are impaired due to reasons of credit quality. Accordingly, as of September 30, 2017, management believes any impairment in the Company’s securities is temporary, and therefore no impairment loss has been recognized in the Company’s consolidated statement of income.

Securities with unrealized losses, segregated by length of time, that have been in a continuous loss position were as follows:

	September 30, 2017
	Less than 12 Months					More than 12 Months					Total
	Estimated Fair Value		Unrealized Losses			Estimated Fair Value		Unrealized Losses			Estimated Fair Value		Unrealized Losses
	(Dollars in thousands)
Available for Sale
Collateralized mortgage obligations	$	3,665	$	(35	)	$	1,062	$	(20	)	$	4,727	$	(55	)
Mortgage-backed securities		47,193		(31	)		2,121		(4	)		49,314		(35	)
Other securities		1,654		(83	)		—		—			1,654		(83	)
Total	$	52,512	$	(149	)	$	3,183	$	(24	)	$	55,695	$	(173	)
Held to Maturity
States and political subdivisions	$	5,670	$	(2	)	$	2,493	$	(29	)	$	8,163	$	(31	)
Collateralized mortgage obligations		—		—			105		(3	)		105		(3	)
Mortgage-backed securities		3,769,272		(38,317	)		1,288,588		(31,162	)		5,057,860		(69,479	)
Total	$	3,774,942	$	(38,319	)	$	1,291,186	$	(31,194	)	$	5,066,128	$	(69,513	)

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

	December 31, 2016
	Less than 12 Months					More than 12 Months					Total
	Estimated Fair Value		Unrealized Losses			Estimated Fair Value		Unrealized Losses			Estimated Fair Value		Unrealized Losses
	(Dollars in thousands)
Available for Sale
Collateralized mortgage obligations	$	10,723	$	(119	)	$	—	$	—		$	10,723	$	(119	)
Mortgage-backed securities		45,456		(160	)		2,334		(5	)		47,790		(165	)
Other securities		—		—			1,691		(46	)		1,691		(46	)
Total	$	56,179	$	(279	)	$	4,025	$	(51	)	$	60,204	$	(330	)
Held to Maturity
States and political subdivisions	$	115,132	$	(1,288	)	$	5,080	$	(40	)	$	120,212	$	(1,328	)
Collateralized mortgage obligations		589		(4	)		44		(1	)		633		(5	)
Mortgage-backed securities		6,903,919		(195,556	)		90,293		(3,883	)		6,994,212		(199,439	)
Total	$	7,019,640	$	(196,848	)	$	95,417	$	(3,924	)	$	7,115,057	$	(200,772	)

At September 30, 2017 and December 31, 2016, there were 257 securities and 276 securities, respectively, in an unrealized loss position for more than 12 months.

The amortized cost and fair value of investment securities at September 30, 2017, by contractual maturity, are shown below. Actual maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations at any time with or without call or prepayment penalties.

	Held to Maturity				Available for Sale
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
	(Dollars in thousands)
Due in one year or less	$	29,734	$	29,888	$	13,098	$	13,141
Due after one year through five years		186,944		189,091		1,306		1,310
Due after five years through ten years		129,778		133,624		—		—
Due after ten years		17,014		17,549		—		—
Subtotal		363,470		370,152		14,404		14,451
Mortgage-backed securities and collateralized mortgage obligations		8,813,401		8,784,573		217,612		219,200
Total	$	9,176,871	$	9,154,725	$	232,016	$	233,651

The Company recorded no gain or loss on the sale of securities for the three months ended September 30, 2017 and a $3.3 million gain on sale of securities for the nine months ended September 30, 2017. No gain or loss on sale of securities was recorded for the three and nine months ended September 30, 2016. As of September 30, 2017, the Company did not own any non-agency collateralized mortgage obligations.

At September 30, 2017 and December 31, 2016, the Company did not own securities of any one issuer (other than the U.S. government and its agencies) for which aggregate adjusted cost exceeded 10% of the consolidated shareholders’ equity at such respective dates.

Securities with an amortized cost of $5.02 billion and $5.64 billion and a fair value of $4.99 billion and $5.51 billion at September 30, 2017 and December 31, 2016, respectively, were pledged to collateralize public deposits and for other purposes required or permitted by law.

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

5. LOANS AND ALLOWANCE FOR CREDIT LOSSES

The loan portfolio consists of various types of loans and is categorized by major type as follows:

	September 30, 2017		December 31, 2016
	(Dollars in thousands)
Residential mortgage loans held for sale	$	25,473	$	26,975

Commercial and industrial		1,472,397		1,539,439
Real estate:
Construction, land development and other land loans		1,453,535		1,263,923
1-4 family residential (includes home equity)		2,707,654		2,690,856
Commercial real estate (includes multi-family residential)		3,295,001		3,162,109
Farmland		503,727		484,588
Agriculture		188,789		187,748
Consumer and other		264,626		266,422
Total loans held for investment		9,885,729		9,595,085
Total	$	9,911,202	$	9,622,060

Concentrations of Credit. Most of the Company’s lending activity occurs within the states of Texas and Oklahoma. Commercial real estate loans, 1-4 family residential loans and construction, land development and other land loans make up 75.2% of the Company’s total loan portfolio at September 30, 2017. As of September 30, 2017 and December 31, 2016, there were no concentrations of loans related to any single industry in excess of 10% of total loans.

Foreign Loans. The Company has U.S. dollar-denominated loans and commitments to borrowers in Mexico. The outstanding balance of these loans and the unfunded amounts available under these commitments were not significant at September 30, 2017 or December 31, 2016.

Related Party Loans. As of September 30, 2017 and December 31, 2016, loans outstanding to directors, officers and their affiliates totaled $3.5 million and $4.5 million, respectively. All transactions between the Company and such related parties are conducted in the ordinary course of business and made on the same terms and conditions as similar transactions with unaffiliated persons.

An analysis of activity with respect to these related party loans is as follows:

	As of and for the nine months ended September 30, 2017			As of and for the year ended December 31, 2016
	(Dollars in thousands)
Beginning balance on January 1	$	4,493		$	4,063
New loans		—			699
Repayments and reclassified related loans		(977	)		(269	)
Ending balance	$	3,516		$	4,493

Nonperforming Assets and Nonaccrual and Past Due Loans. The Company has several procedures in place to assist it in maintaining the overall quality of its loan portfolio. The Company has established underwriting guidelines to be followed by its officers, including requiring appraisals on loans collateralized by real estate. The Company also monitors its delinquency levels for any negative or adverse trends. Nevertheless, the Company’s loan portfolio could become subject to increasing pressures from deteriorating borrower credit due to general economic conditions.

The Company generally places a loan on nonaccrual status and ceases accruing interest when the payment of principal or interest is delinquent for 90 days, or earlier in some cases, unless the loan is in the process of collection and the underlying collateral fully supports the carrying value of the loan.

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

With respect to potential problem loans, an evaluation of the borrower’s overall financial condition is made to determine the need, if any, for possible writedowns or appropriate additions to the allowance for credit losses.

An aging analysis of past due loans, segregated by category of loan, is presented below:

	September 30, 2017
	Loans Past Due and Still Accruing
	30-89 Days		90 or More Days		Total Past Due Loans		Nonaccrual Loans		Current Loans		Total Loans
	(Dollars in thousands)
Construction, land development and other land loans	$	6,763	$	—	$	6,763	$	130	$	1,446,642	$	1,453,535
Agriculture and agriculture real estate (includes farmland)		1,060		—		1,060		140		691,316		692,516
1-4 family (includes home equity) ⁽¹⁾		8,706		166		8,872		3,288		2,720,967		2,733,127
Commercial real estate (includes multi-family residential)		5,240		2,853		8,093		2,410		3,284,498		3,295,001
Commercial and industrial		6,900		1,882		8,782		20,204		1,443,411		1,472,397
Consumer and other		205		33		238		95		264,293		264,626
Total	$	28,874	$	4,934	$	33,808	$	26,267	$	9,851,127	$	9,911,202

	December 31, 2016
	Loans Past Due and Still Accruing
	30-89 Days		90 or More Days		Total Past Due Loans		Nonaccrual Loans		Current Loans		Total Loans
	(Dollars in thousands)
Construction, land development and other land loans	$	8,766	$	514	$	9,280	$	73	$	1,254,570	$	1,263,923
Agriculture and agriculture real estate (includes farmland)		1,813		381		2,194		161		669,981		672,336
1-4 family (includes home equity) ⁽¹⁾		8,645		53		8,698		3,726		2,705,407		2,717,831
Commercial real estate (includes multi-family residential)		4,250		—		4,250		3,528		3,154,331		3,162,109
Commercial and industrial		8,290		8		8,298		23,999		1,507,142		1,539,439
Consumer and other		886		—		886		155		265,381		266,422
Total	$	32,650	$	956	$	33,606	$	31,642	$	9,556,812	$	9,622,060

(1) Includes $25.5 million and $27.0 million of residential mortgage loans held for sale at September 30, 2017 and December 31, 2016, respectively.

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

The following table presents information regarding nonperforming assets as of the dates indicated:

	September 30, 2017			December 31, 2016
	(Dollars in thousands)
Nonaccrual loans ⁽¹⁾	$	26,267		$	31,642
Accruing loans 90 or more days past due		4,934			956
Total nonperforming loans		31,201			32,598
Repossessed assets		110			241
Other real estate		14,512			15,463
Total nonperforming assets	$	45,823		$	48,302

Nonperforming assets to total loans and other real estate		0.46	%		0.50	%

(1) Includes troubled debt restructurings of $4.4 million and $97 thousand as of September 30, 2017 and December 31, 2016, respectively.

The Company had $45.8 million in nonperforming assets at September 30, 2017 compared with $48.3 million at December 31, 2016. Nonperforming assets were 0.46% of total loans and other real estate at September 30, 2017 compared with 0.50% of total loans and other real estate at December 31, 2016. These low nonperforming asset ratios are reflective of the Company’s conservative lending approach.

If interest on nonaccrual loans had been accrued under the original loan terms, approximately $2.3 million and $2.2 million would have been recorded as income for the nine months ended September 30, 2017 and 2016, respectively.

Acquired Loans. Acquired loans were preliminarily recorded at fair value based on a discounted cash flow valuation methodology that considers, among other things, interest rates, projected default rates, loss given default, and recovery rates (no allowance for credit losses was carried over from the acquisition completed during 2016). During the valuation process, the Company identified Purchased Credit-Impaired (“PCI”) and Non-PCI loans in the acquired loan portfolios. Loans acquired with evidence of credit quality deterioration at acquisition for which it was probable that the Company would not be able to collect all contractual amounts due were accounted for as PCI. PCI loan identification considers the following factors: payment history and past due status, debt service coverage, loan grading, collateral values and other factors that may indicate deterioration of credit quality since origination. Non-PCI loan identification considers the following factors: account types, remaining terms, annual interest rates or coupons, current market rates, interest types, past delinquencies, timing of principal and interest payments, loan to value ratios, loss exposures and remaining balances. Accretion of purchased discounts on PCI loans will be based on estimated future cash flows, regardless of contractual maturities. Accretion of purchased discounts on Non-PCI loans will be recognized on a level-yield basis based on contractual maturity of individual loans.

PCI Loans. The carrying amount of PCI loans included in the consolidated balance sheet and the related outstanding balance as of the dates indicated are presented in the table below. The outstanding balance represents the total amount owed as of September 30, 2017 and December 31, 2016.

	September 30, 2017			December 31, 2016
	(Dollars in thousands)
PCI loans:
Outstanding balance	$	40,367		$	51,640
Discount		(17,040	)		(24,007	)
Recorded investment	$	23,327		$	27,633

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

Changes in the accretable yield for acquired PCI loans for the three and nine months ended September 30, 2017 and 2016 were as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
	(Dollars in thousands)
Balance at beginning of period	$	8,757		$	12,015		$	9,778		$	5,664
Additions		—			—			—			10,222
Reclassifications from nonaccretable		1,161			1,378			3,339			8,809
Accretion		(1,525	)		(2,324	)		(4,724	)		(13,626	)
Balance at September 30	$	8,393		$	11,069		$	8,393		$	11,069

Income recognition on PCI loans is subject to the Company’s ability to reasonably estimate both the timing and amount of future cash flows. PCI loans for which the Company is accruing interest income are not considered non-performing or impaired. The non-accretable difference represents contractual principal and interest the Company does not expect to collect.

Non-PCI Loans. The carrying amount of Non-PCI loans included in the consolidated balance sheet and the related outstanding balance as of the dates indicated are presented in the table below. The outstanding balance represents the total amount owed as of September 30, 2017 and December 31, 2016, including accrued but unpaid interest.

	September 30, 2017			December 31, 2016
	(Dollars in thousands)
Non-PCI loans:
Outstanding balance	$	796,477		$	1,115,061
Discount		(22,997	)		(35,401	)
Recorded investment	$	773,480		$	1,079,660

Changes in the discount accretion for Non-PCI loans for the three and nine months ended September 30, 2017 and 2016 were as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
	(Dollars in thousands)
Balance at beginning of period	$	29,359		$	44,672		$	35,401		$	54,734
Additions		—			—			—			3,491
Accretion charge-offs		(1	)		(16	)		(18	)		(1,073	)
Accretion		(6,361	)		(5,296	)		(12,386	)		(17,792	)
Balance at September 30	$	22,997		$	39,360		$	22,997		$	39,360

Impaired Loans. Loans are considered impaired when, based on current information and events, it is probable the Company will be unable to collect all amounts due in accordance with the original contractual terms of the loan agreement, including scheduled principal and interest payments. Impairment is evaluated in total for smaller-balance loans of a similar nature and on an individual loan basis for other loans. If a loan is impaired, a specific valuation allowance is allocated, if necessary, so that the loan is reported net, at the present value of estimated future cash flows using the loan’s existing rate or at the fair value of collateral if repayment is expected solely from the collateral. Interest payments on impaired loans are typically applied to principal unless collectability of the principal amount is reasonably assured, in which case interest is recognized on a cash basis. Impaired loans, or portions thereof, are charged off when deemed uncollectible.

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

Impaired loans are set forth in the following tables. No interest income was recognized on impaired loans subsequent to their classification as impaired. The average recorded investment presented in the tables below is reported on a year-to-date basis.

	September 30, 2017
	Recorded Investment		Unpaid Contractual Principal Balance		Related Allowance		Average Recorded Investment
	(Dollars in thousands)
With no related allowance recorded:
Construction, land development and other land loans	$	94	$	109	$	—	$	54
Agriculture and agriculture real estate (includes farmland)		141		181		—		74
1-4 family (includes home equity)		2,796		3,056		—		2,623
Commercial real estate (includes multi-family residential)		685		715		—		1,935
Commercial and industrial		10,985		15,803		—		9,955
Consumer and other		95		156		—		107
Total		14,796		20,020		—		14,748

With an allowance recorded:
Construction, land development and other land loans		—		—		—		—
Agriculture and agriculture real estate (includes farmland)		—		—		—		77
1-4 family (includes home equity)		478		478		97		458
Commercial real estate (includes multi-family residential)		1,486		1,499		193		887
Commercial and industrial		7,933		8,113		3,879		10,630
Consumer and other		—		—		—		2
Total		9,897		10,090		4,169		12,054

Total:
Construction, land development and other land loans		94		109		—		54
Agriculture and agriculture real estate (includes farmland)		141		181		—		151
1-4 family (includes home equity)		3,274		3,534		97		3,081
Commercial real estate (includes multi-family residential)		2,171		2,214		193		2,822
Commercial and industrial		18,918		23,916		3,879		20,585
Consumer and other		95		156		—		109
	$	24,693	$	30,110	$	4,169	$	26,802

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

	December 31, 2016
	Recorded Investment		Unpaid Contractual Principal Balance		Related Allowance		Average Recorded Investment
	(Dollars in thousands)
With no related allowance recorded:
Construction, land development and other land loans	$	14	$	220	$	—	$	24
Agriculture and agriculture real estate (includes farmland)		7		12		—		14
1-4 family (includes home equity)		2,450		2,682		—		1,828
Commercial real estate (includes multi-family residential)		3,184		3,327		—		9,150
Commercial and industrial		8,925		9,446		—		5,139
Consumer and other		119		157		—		88
Total		14,699		15,844		—		16,243

With an allowance recorded:
Construction, land development and other land loans		—		—		—		3
Agriculture and agriculture real estate (includes farmland)		154		181		17		171
1-4 family (includes home equity)		437		449		150		408
Commercial real estate (includes multi-family residential)		288		288		178		275
Commercial and industrial		13,327		13,821		2,851		13,961
Consumer and other		4		4		1		93
Total		14,210		14,743		3,197		14,911

Total:
Construction, land development and other land loans		14		220		—		27
Agriculture and agriculture real estate (includes farmland)		161		193		17		185
1-4 family (includes home equity)		2,887		3,131		150		2,236
Commercial real estate (includes multi-family residential)		3,472		3,615		178		9,425
Commercial and industrial		22,252		23,267		2,851		19,100
Consumer and other		123		161		1		181
	$	28,909	$	30,587	$	3,197	$	31,154

Credit Quality Indicators. As part of the on-going monitoring of the credit quality of the Company’s loan portfolio and methodology for calculating the allowance for credit losses, management assigns and tracks loan grades to be used as credit quality indicators. The following is a general description of the loan grades used:

Grade 1—Credits in this category have risk potential that is virtually nonexistent. These loans may be secured by insured certificates of deposit, insured savings accounts, U.S. Government securities and highly rated municipal bonds.

Grade 2—Credits in this category are of the highest quality. These borrowers represent top rated companies and individuals with unquestionable financial standing with excellent global cash flow coverage, net worth, liquidity and collateral coverage.

Grade 3—Credits in this category are not immune from risk but are well protected by the collateral and paying capacity of the borrower. These loans may exhibit a minor unfavorable credit factor, but the overall credit is sufficiently strong to minimize the possibility of loss.

Grade 4—Credits in this category are considered to be of acceptable credit quality with moderately greater risk than Grade 3 and receiving closer monitoring. Loans in this category have sources of repayment that remain sufficient to preclude a larger than normal probability of default and secondary sources are likewise currently of sufficient quantity, quality, and liquidity to protect the Company against loss of principal and interest. These borrowers have specific risk factors, but the overall strength of the credit is acceptable based on other mitigating credit and/or collateral factors and can repay the debt in the normal course of business.

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

Grade 5—Credits in this category constitute an undue and unwarranted credit risk; however, the factors do not rise to a level of substandard. These credits have potential weaknesses and/or declining trends that, if not corrected, could expose the Bank to risk at a future date. These loans are monitored on the Bank’s internally-generated watch list and evaluated on a quarterly basis.

Grade 6—Credits in this category are considered “substandard” but “non-impaired” loans in accordance with regulatory guidelines. Loans in this category have well-defined weakness that, if not corrected, could make default of principal and interest possible. Loans in this category are still accruing interest and may be dependent upon secondary sources of repayment and/or collateral liquidation.

Grade 7—Credits in this category are deemed “substandard” and “impaired” pursuant to regulatory guidelines. As such, the Bank has determined that it is probable that less than 100% of the contractual principal and interest will be collected. These loans are individually evaluated for a specific reserve and will typically have the accrual of interest stopped.

Grade 8—Credits in this category include “doubtful” loans in accordance with regulatory guidance. Such loans are no longer accruing interest and factors indicate a loss is imminent. These loans are also deemed “impaired.” While a specific reserve may be in place while the loan and collateral is being evaluated, these loans are typically charged down to an amount the Bank estimates is collectible.

Grade 9—Credits in this category are deemed a “loss” in accordance with regulatory guidelines and have been charged off or charged down. The Bank may continue collection efforts and may have partial recovery in the future.

The following table presents risk grades and PCI loans by category of loan at September 30, 2017. Impaired loans include loans in risk grades 7, 8 and 9, as well as any PCI loan that has a specific reserve allocated to it.

	Construction, Land Development and Other Land Loans		Agriculture and Agriculture Real Estate (includes Farmland)		1-4 Family (includes Home Equity) ⁽¹⁾		Commercial Real Estate (includes Multi-Family Residential)		Commercial and Industrial		Consumer and Other		Total
	(Dollars in thousands)
Grade 1	$	—	$	14,515	$	—	$	—	$	48,793	$	38,163	$	101,471
Grade 2		2,120		4,280		29,417		30,690		10,451		25,788		102,746
Grade 3		1,354,516		588,797		2,626,512		2,950,268		1,096,171		185,654		8,801,918
Grade 4		87,990		74,706		60,731		241,940		195,508		6,574		667,449
Grade 5		392		7,918		3,643		37,060		61,953		3,200		114,166
Grade 6		7,445		1,777		4,883		18,687		37,488		5,152		75,432
Grade 7		94		141		3,177		2,171		18,918		95		24,596
Grade 8		—		—		97		—		—		—		97
Grade 9		—		—		—		—		—		—		—
PCI Loans ⁽²⁾		978		382		4,667		14,185		3,115		—		23,327
Total	$	1,453,535	$	692,516	$	2,733,127	$	3,295,001	$	1,472,397	$	264,626	$	9,911,202

(1) Includes $25.5 million of residential mortgage loans held for sale at September 30, 2017.

(2) Of the total PCI loans, $1.6 million were classified as substandard at September 30, 2017, with no specific reserves allocated to them.

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

The following table presents risk grades and PCI loans by category of loan at December 31, 2016. Impaired loans include loans in risk grades 7, 8 and 9, as well as any PCI loan that has a specific reserve allocated to it.

	Construction, Land Development and Other Land Loans		Agriculture and Agriculture Real Estate (includes Farmland)		1-4 Family (includes Home Equity) ⁽¹⁾		Commercial Real Estate (includes Multi-Family Residential)		Commercial and Industrial		Consumer and Other		Total
	(Dollars in thousands)
Grade 1	$	—	$	14,616	$	—	$	—	$	54,908	$	40,688	$	110,212
Grade 2		2,261		4,218		22,863		8,317		12,772		11,041		61,472
Grade 3		1,200,623		570,324		2,622,304		2,859,433		1,143,634		194,210		8,590,528
Grade 4		54,380		74,079		55,367		220,533		176,287		16,095		596,741
Grade 5		2,525		7,703		3,605		45,533		57,283		2,403		119,052
Grade 6		2,690		847		5,095		8,401		68,682		1,829		87,544
Grade 7		13		161		2,857		3,472		21,475		156		28,134
Grade 8		—		—		30		—		714		—		744
Grade 9		—		—		—		—		—		—		—
PCI Loans ⁽²⁾		1,431		388		5,710		16,420		3,684		—		27,633
Total	$	1,263,923	$	672,336	$	2,717,831	$	3,162,109	$	1,539,439	$	266,422	$	9,622,060

(1) Includes $27.0 million of residential mortgage loans held for sale at December 31, 2016.

(2) Of the total PCI loans, $2.7 million were classified as substandard at December 31, 2016, which includes $31 thousand with specific reserves allocated to them.

Allowance for Credit Losses. The allowance for credit losses is a valuation established through charges to earnings in the form of a provision for credit losses. Management has established an allowance for credit losses which it believes is adequate as of September 30, 2017 for estimated losses in the Company’s loan portfolio. The amount of the allowance for credit losses is affected by the following: (1) charge-offs of loans that occur when loans are deemed uncollectible and decrease the allowance, (2) recoveries on loans previously charged off that increase the allowance and (3) provisions for credit losses charged to earnings that increase the allowance. Based on an evaluation of the loan portfolio and consideration of the factors listed below, management presents a quarterly review of the allowance for credit losses to the Bank’s Board of Directors, indicating any change in the allowance since the last review and any recommendations as to adjustments in the allowance. Although management believes it uses the best information available to make determinations with respect to the allowance for credit losses, future adjustments may be necessary if economic conditions or the borrower’s performance differ from the assumptions used in making the initial determinations.

The Company’s allowance for credit losses consists of two components: (1) a specific valuation allowance based on probable losses on specifically identified loans and (2) a general valuation allowance based on historical loan loss experience, general economic conditions and other qualitative risk factors both internal and external to the Company.

In setting the specific valuation allowance, the Company follows a loan review program to evaluate the credit risk in the total loan portfolio and assigns risk grades to each loan. Through this loan review process, the Company maintains an internal list of impaired loans, which along with the delinquency list of loans, helps management assess the overall quality of the loan portfolio and the adequacy of the allowance for credit losses. All loans that have been identified as impaired are reviewed on a quarterly basis in order to determine whether a specific reserve is required. For certain impaired loans, the Company allocates a specific loan loss reserve primarily based on the value of the collateral securing the impaired loan in accordance with ASC Topic 310-10, “Receivables.” The specific reserves are determined on an individual loan basis. Loans for which specific reserves are provided are excluded from the general valuation allowance described below.

In connection with this review of the loan portfolio, the Company considers risk elements attributable to particular loan types or categories in assessing the quality of individual loans. Some of the risk elements include:

•

for 1-4 family residential mortgage loans, the borrower’s ability to repay the loan, including a consideration of the debt to income ratio and employment and income stability, the loan to value ratio, and the age, condition and marketability of collateral;

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

•

for commercial real estate loans and multifamily residential loans, the debt service coverage ratio (income from the property in excess of operating expenses compared to loan payment requirements), operating results of the owner in the case of owner-occupied properties, the loan to value ratio, the age and condition of the collateral and the volatility of income, property value and future operating results typical of properties of that type;

•

for construction, land development and other land loans, the perceived feasibility of the project including the ability to sell developed lots or improvements constructed for resale or the ability to lease property constructed for lease, the quality and nature of contracts for presale or prelease, if any, experience and ability of the developer and loan to value ratio;

•

for commercial and industrial loans, the operating results of the commercial, industrial or professional enterprise, the borrower’s business, professional and financial ability and expertise, the specific risks and volatility of income and operating results typical for businesses in that category and the value, nature and marketability of collateral;

•

for agriculture real estate loans, the experience and financial capability of the borrower, projected debt service coverage of the operations of the borrower and loan to value ratio; and

•

for non-real estate agriculture loans, the operating results, experience and financial capability of the borrower, historical and expected market conditions and the value, nature and marketability of collateral.

In addition, for each category, the Company considers secondary sources of income and the financial strength and credit history of the borrower and any guarantors.

In determining the amount of the general valuation allowance, management considers factors such as historical loan loss experience, concentration risk of specific loan types, the volume, growth and composition of the Company’s loan portfolio, current economic conditions that may affect the borrower’s ability to pay and the value of collateral, the evaluation of the Company’s loan portfolio through its internal loan review process, general economic conditions, other qualitative risk factors both internal and external to the Company and other relevant factors in accordance with ASC Topic 450, “Contingencies.” Based on a review of these factors for each loan type, the Company applies an estimated percentage to the outstanding balance of each loan type, excluding any loan that has a specific reserve allocated to it. The Company uses this information to establish the amount of the general valuation allowance. At September 30, 2017, the allowance for credit losses totaled $86.8 million or 0.88% of total loans, including acquired loans with discounts. At December 31, 2016, the allowance for credit losses totaled $85.3 million or 0.89% of total loans, including acquired loans with discounts.

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

The following table details activity in the allowance for credit losses by category of loan for the three and nine months ended September 30, 2017 and 2016. Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories.


	Construction, Land Development and Other Land Loans			Agriculture and Agriculture Real Estate (includes Farmland)			1-4 Family (includes Home Equity)			Commercial Real Estate (includes Multi-Family Residential)			Commercial and Industrial			Consumer and Other			Total
	(Dollars in thousands)
Allowance for credit losses:
Three Months Ended
Balance June 30, 2017	$	14,516		$	4,009		$	14,442		$	10,379		$	38,998		$	1,439		$	83,783
Provision for credit losses		558			(16	)		256			328			5,081			693			6,900
Charge-offs		—			(36	)		(35	)		—			(3,470	)		(881	)		(4,422	)
Recoveries		2			36			23			3			245			242			551
Net charge-offs		2			—			(12	)		3			(3,225	)		(639	)		(3,871	)
Balance September 30, 2017	$	15,076		$	3,993		$	14,686		$	10,710		$	40,854		$	1,493		$	86,812

Nine Months Ended
Balance December 31, 2016	$	14,984		$	4,073		$	16,571		$	12,256		$	35,836		$	1,606		$	85,326
Provision for credit losses		(35	)		(174	)		(1,873	)		(1,416	)		14,269			1,554			12,325
Charge-offs		(9	)		(53	)		(157	)		(133	)		(10,113	)		(2,486	)		(12,951	)
Recoveries		136			147			145			3			862			819			2,112
Net charge-offs		127			94			(12	)		(130	)		(9,251	)		(1,667	)		(10,839	)
Balance September 30, 2017	$	15,076		$	3,993		$	14,686		$	10,710		$	40,854		$	1,493		$	86,812

Allowance for credit losses:
Three Months Ended
Balance June 30, 2016	$	14,202		$	4,129		$	14,916		$	12,672		$	36,254		$	1,653		$	83,826
Provision for credit losses		(78	)		(40	)		167			(477	)		1,753			675			2,000
Charge-offs		—			(1	)		(63	)		—			(24	)		(946	)		(1,034	)
Recoveries		368			46			15			1			131			232			793
Net charge-offs		368			45			(48	)		1			107			(714	)		(241	)
Balance September 30, 2016	$	14,492		$	4,134		$	15,035		$	12,196		$	38,114		$	1,614		$	85,585

Nine Months Ended
Balance December 31, 2015	$	14,882		$	3,845		$	14,891		$	12,996		$	33,409		$	1,361		$	81,384
Provision for credit losses		(969	)		6,551			144			(545	)		13,103			3,716			22,000
Charge-offs		(7	)		(7,026	)		(114	)		(257	)		(10,641	)		(4,371	)		(22,416	)
Recoveries		586			764			114			2			2,243			908			4,617
Net charge-offs		579			(6,262	)		—			(255	)		(8,398	)		(3,463	)		(17,799	)
Balance September 30, 2016	$	14,492		$	4,134		$	15,035		$	12,196		$	38,114		$	1,614		$	85,585

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

The following table details the amount of the allowance for credit losses allocated to each category of loan as of September 30, 2017, December 31, 2016 and September 30, 2016, on the basis of the impairment methodology used by the Company.

	Construction, Land Development and Other Land Loans		Agriculture and Agriculture Real Estate (includes Farmland)		1-4 Family (includes Home Equity)		Commercial Real Estate (includes Multi-Family Residential)		Commercial and Industrial		Consumer and Other		Total
	(Dollars in thousands)
Allowance for credit losses related to:
September 30, 2017
Individually evaluated for impairment	$	—	$	—	$	97	$	193	$	3,879	$	—	$	4,169
Collectively evaluated for impairment		15,076		3,993		14,589		10,517		36,975		1,493		82,643
PCI loans		—		—		—		—		—		—		—
Total allowance for credit losses	$	15,076	$	3,993	$	14,686	$	10,710	$	40,854	$	1,493	$	86,812

December 31, 2016
Individually evaluated for impairment	$	—	$	17	$	150	$	178	$	2,820	$	1	$	3,166
Collectively evaluated for impairment		14,984		4,056		16,421		12,078		32,985		1,605		82,129
PCI loans		—		—		—		—		31		—		31
Total allowance for credit losses	$	14,984	$	4,073	$	16,571	$	12,256	$	35,836	$	1,606	$	85,326

September 30, 2016
Individually evaluated for impairment	$	—	$	102	$	140	$	13	$	5,330	$	46	$	5,631
Collectively evaluated for impairment		14,492	$	4,032		14,895		12,183		32,560		1,568		79,730
PCI loans		—		—		—		—		224		—		224
Total allowance for credit losses	$	14,492	$	4,134	$	15,035	$	12,196	$	38,114	$	1,614	$	85,585

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

The following table details the recorded investment in loans as of September 30, 2017, December 31, 2016 and September 30, 2016, excluding $25.5 million, $27.0 million and $29.5 million, respectively, of residential mortgage loans held for sale, related to each balance in the allowance for credit losses by category of loan.


	Construction, Land Development and Other Land Loans		Agriculture and Agriculture Real Estate (includes Farmland)		1-4 Family (includes Home Equity)		Commercial Real Estate (includes Multi-Family Residential)		Commercial and Industrial		Consumer and Other		Total
	(Dollars in thousands)
Recorded investment in loans:
September 30, 2017
Individually evaluated for impairment	$	94	$	141	$	3,274	$	2,171	$	18,918	$	95	$	24,693
Collectively evaluated for impairment		1,452,463		691,993		2,699,713		3,278,645		1,450,364		264,531		9,837,709
PCI loans		978		382		4,667		14,185		3,115		—		23,327
Total loans evaluated for impairment	$	1,453,535	$	692,516	$	2,707,654	$	3,295,001	$	1,472,397	$	264,626	$	9,885,729

December 31, 2016
Individually evaluated for impairment	$	14	$	161	$	2,887	$	3,472	$	22,221	$	123	$	28,878
Collectively evaluated for impairment		1,262,478		671,787		2,682,259		3,142,217		1,513,534		266,299		9,538,574
PCI loans		1,431		388		5,710		16,420		3,684		—		27,633
Total loans evaluated for impairment	$	1,263,923	$	672,336	$	2,690,856	$	3,162,109	$	1,539,439	$	266,422	$	9,595,085

September 30, 2016
Individually evaluated for impairment	$	177	$	248	$	2,281	$	12,889	$	24,261	$	163	$	40,019
Collectively evaluated for impairment		1,204,172		663,439		2,670,004		3,127,974		1,509,663		270,171		9,445,423
PCI loans		1,471		393		5,710		17,706		8,135		—		33,415
Total loans evaluated for impairment	$	1,205,820	$	664,080	$	2,677,995	$	3,158,569	$	1,542,059	$	270,334	$	9,518,857

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

Troubled Debt Restructurings. The restructuring of a loan is considered a “troubled debt restructuring” if both (1) the borrower is experiencing financial difficulties and (2) the creditor has granted a concession. Concessions may include interest rate reductions or below market interest rates, principal forgiveness, restructuring amortization schedules and other actions intended to minimize potential losses. Under ASC topic 310-40 “Receivables—Troubled Debt Restructurings by Creditors,” the Company evaluates all loan modifications to identify whether the restructuring constitutes a troubled debt restructuring. As of September 30, 2017 and 2016, the Company had $4.4 million and $318 thousand, respectively, in outstanding troubled debt restructurings. The following table presents information regarding the recorded investment of loans modified as troubled debt restructurings during the nine months ended September 30, 2017 and 2016:

	Nine Months Ended
	September 30,
	2017						2016
	Number of Loans		Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment		Number of Loans		Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment
	(Dollars in thousands)
Troubled Debt Restructurings
Construction, land development and other land loans		—	$	—	$	—		—	$	—	$	—
Agriculture and agriculture real estate (includes farmland)		—		—		—		1		154		152
1-4 Family (includes home equity)		—		—		—		—		—		—
Commercial real estate (includes multi-family residential)		—		—		—		—		—		—
Commercial and industrial		3		8,656		4,338		—		—		—
Consumer and other		—		—		—		—		—		—
Total		3	$	8,656	$	4,338		1	$	154	$	152

For the nine months ended September 30, 2017, the Company added three loans totaling $8.7 million as new troubled debt restructurings, of which two loans totaling $4.3 million remain outstanding at September 30, 2017. These two loans, which were modified during the first quarter of 2017, have defaulted as of September 30, 2017. Default is determined at 90 or more days past due. For the nine months ended September 30, 2016, the Company added one loan totaling $154 thousand as a new troubled debt restructuring, of which $152 thousand was outstanding at September 30, 2016. During the nine months ended September 30, 2017, the Company recognized charge-offs totaling $2.5 million related to a loan restructured during the first quarter of 2017. There were no charge-offs related to restructured loans recognized during the nine months ended September 30, 2016. The modifications generally related to extending the amortization periods of the loans, which includes loans modified during bankruptcy. The Company did not grant principal reductions on any restructured loans at the time of modification. These modifications did not have a material impact on the Company’s determination of the allowance for credit losses.

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

6. FAIR VALUE

The Company uses fair value measurements to record fair value adjustments to certain assets and to determine fair value disclosures. Fair values represent the estimated price that would be received from selling an asset or paid to transfer a liability, otherwise known as an “exit price.” Securities available for sale are recorded at fair value on a recurring basis. Additionally, from time to time, the Company may be required to record other assets at fair value on a nonrecurring basis such as certain loans including residential mortgage loans held for sale, goodwill and other intangible assets and other real estate owned. These nonrecurring fair value adjustments typically involve application of lower-of-cost-or-market accounting or write downs of individual assets. ASC Topic 820 “Fair Value Measurements and Disclosures” establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows:

Fair Value Hierarchy

The Company groups financial assets and financial liabilities measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. These levels are:

•

Level 1—Quoted prices in active markets for identical assets or liabilities.

•

Level 2—Other significant observable inputs (including quoted prices in active markets for similar assets or liabilities) or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

•

Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The fair value of an asset or liability is the price that would be received to sell that asset or paid to transfer that liability in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. Such valuation techniques are consistently applied. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability.

The fair value disclosures below represent the Company’s estimates based on relevant market information and information about the financial instruments. Fair value estimates are based on judgments regarding current economic conditions, risk characteristics of the various instruments and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in the above methodologies and assumptions could significantly affect the estimates.

The following tables present fair values for assets and liabilities measured at fair value on a recurring basis:

	As of September 30, 2017
	Level 1		Level 2		Level 3		Total
	(Dollars in thousands)
Assets:
Available for sale securities:
States and political subdivisions	$	—	$	1,820	$	—	$	1,820
Collateralized mortgage obligations		—		105,108		—		105,108
Mortgage-backed securities		—		114,092		—		114,092
Other securities		12,631		—		—		12,631
Total	$	12,631	$	221,020	$	—	$	233,651

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

	As of December 31, 2016
	Level 1		Level 2		Level 3		Total
	(Dollars in thousands)
Assets:
Available for sale securities:
States and political subdivisions	$	—	$	1,920	$	—	$	1,920
Collateralized mortgage obligations		—		120,599		—		120,599
Mortgage-backed securities		—		85,863		—		85,863
Other securities		12,794		—		—		12,794
Total	$	12,794	$	208,382	$	—	$	221,176

Certain assets and liabilities are measured at fair value on a nonrecurring basis; that is, the instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). These instruments include other real estate owned, repossessed assets, held to maturity debt securities, loans held for sale and impaired loans, which are included as loans held for investment. For the three and nine months ended September 30, 2017, the Company had additions to other real estate owned of $112 thousand and $1.5 million, respectively, of which $112 thousand and $852 thousand, respectively, were outstanding as of September 30, 2017. For the three and nine months ended September 30, 2017, the Company had additions to impaired loans of $4.6 million and $16.0 million, respectively, of which $4.6 million and $13.7 million, respectively, were outstanding as of September 30, 2017. The remaining financial assets and liabilities measured at fair value on a non-recurring basis that were recorded in 2017 and remained outstanding at September 30, 2017 were not significant.

The following tables present carrying and fair value information of financial instruments as of the dates indicated:

	As of September 30, 2017
	Carrying		Estimated Fair Value
	Amount		Level 1		Level 2		Level 3		Total
Assets	(Dollars in thousands)
Cash and due from banks	$	302,469	$	302,469	$	—	$	—	$	302,469
Federal funds sold		1,007		1,007		—		—		1,007
Held to maturity securities		9,176,871		—		9,154,725		—		9,154,725
Loans held for sale		25,473		—		25,473		—		25,473
Loans held for investment, net of allowance		9,798,917		—		—		9,815,735		9,815,735
Other real estate owned		14,512		—		14,512		—		14,512

Liabilities
Deposits:
Noninterest-bearing	$	5,465,474	$	—	$	5,465,474	$	—	$	5,465,474
Interest-bearing		11,442,002		—		11,426,388		—		11,426,388
Other borrowings		960,365		—		960,612		—		960,612
Securities sold under repurchase agreements		334,621		—		334,601		—		334,601

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

	As of December 31, 2016
	Carrying		Estimated Fair Value
	Amount		Level 1		Level 2		Level 3		Total
Assets	(Dollars in thousands)
Cash and due from banks	$	436,203	$	436,203	$	—	$	—	$	436,203
Federal funds sold		1,178		1,178		—		—		1,178
Held to maturity securities		9,504,910		—		9,339,455		—		9,339,455
Loans held for sale		26,975		—		26,975		—		26,975
Loans held for investment, net of allowance		9,509,759		—		—		9,533,310		9,533,310
Other real estate owned		15,463		—		15,463		—		15,463

Liabilities
Deposits:
Noninterest-bearing	$	5,190,973	$	—	$	5,190,973	$	—	$	5,190,973
Interest-bearing		12,116,329		—		12,121,157		—		12,121,157
Other borrowings		990,781		—		991,181		—		991,181
Securities sold under repurchase agreements		320,430		—		320,428		—		320,428

The following is a description of the fair value estimates, methods and assumptions that are used by the Company in estimating the fair values of financial instruments.

Cash and due from banks—For these short-term instruments, the carrying amount is a reasonable estimate of fair value. The Company classifies the estimated fair value of these instruments as Level 1.

Federal funds sold—For these short-term instruments, the carrying amount is a reasonable estimate of fair value. The Company classifies the estimated fair value of these instruments as Level 1.

Securities — Fair value measurements based upon quoted prices are considered Level 1 inputs. Level 1 securities consist of U.S. Treasury securities and certain equity securities which are included in the available for sale portfolio. For all other available for sale and held to maturity securities, if quoted prices are not available, fair values are measured using Level 2 inputs. For these securities, the Company generally obtains fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things. The Company reviews the prices supplied by the independent pricing service, as well as their underlying pricing methodologies, for reasonableness.

Securities available for sale are recorded at fair value on a recurring basis.

Loans held for sale— Loans held for sale are carried at the lower of cost or estimated fair value. Fair value for consumer mortgages held for sale is based on commitments on hand from investors or prevailing market prices. As such, the Company classifies loans subjected to nonrecurring fair value adjustments as Level 2.

Loans held for investment— The Company does not record loans at fair value on a recurring basis. As such, valuation techniques discussed herein for loans are primarily for estimating fair value disclosures. However, from time to time, the Company records nonrecurring fair value adjustments to impaired loans to reflect (1) partial write downs that are based on the observable market price or current appraised value of the collateral, or (2) the full charge-off of the loan carrying value. Where appraisals are not available, estimated cash flows are discounted using a rate commensurate with the credit risk associated with those cash flows. Assumptions regarding credit risk, cash flows and discount rates are judgmentally determined using available market information and specific borrower information.

The estimated fair value approximates carrying value for variable-rate loans that reprice frequently and with no significant change in credit risk. The fair value of fixed-rate loans and variable-rate loans which reprice on an infrequent basis is estimated by discounting future cash flows using the current interest rates at which similar loans with similar terms would be made to borrowers of similar credit quality. An overall valuation adjustment is made for specific credit risks as well as general portfolio credit risk. The Company classifies the estimated fair value of loans held for investment as Level 3.

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

Other real estate owned— Other real estate owned is primarily foreclosed properties securing residential loans and commercial real estate. Foreclosed assets are adjusted to fair value less estimated costs to sell upon transfer of the loans to other real estate owned. Subsequently, these assets are carried at the lower of carrying value or fair value less estimated costs to sell. Other real estate carried at fair value based on an observable market price or a current appraised value is classified by the Company as Level 2. When management determines that the fair value of other real estate requires additional adjustments, either as a result of a non-current appraisal or when there is no observable market price, the Company classifies the other real estate as Level 3.

Deposits—The fair value of demand deposits, savings accounts and certain money market deposits is the amount payable on demand at the reporting date. The fair value of fixed-maturity certificates of deposit is estimated using the rates currently offered for deposits of similar remaining maturities. Deposits fair value measurements utilize Level 2 inputs.

Other borrowings—Rates currently available to the Company for debt with similar terms and remaining maturities are used to estimate the fair value of other borrowings using a discounted cash flows methodology and are measured utilizing Level 2 inputs.

Securities sold under repurchase agreements—The fair value of securities sold under repurchase agreements is the amount payable on demand at the reporting date and are measured utilizing Level 2 inputs.

Off-balance sheet financial instruments—The fair value of commitments to extend credit and standby letters of credit is estimated using the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreement and the present creditworthiness of the counterparties. The Company has reviewed the unfunded portion of commitments to extend credit as well as standby and other letters of credit, and has determined that the fair value of such financial instruments is not material. The Company classifies the estimated fair value of credit-related financial instruments as Level 3.

The fair value estimates presented herein are based on pertinent information available to management at September 30, 2017. Although management is not aware of any factors that would significantly affect the estimated fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since those dates and, therefore, current estimates of fair value may differ significantly from the amounts presented herein.

7. GOODWILL AND CORE DEPOSIT INTANGIBLES

Changes in the carrying amount of the Company’s goodwill and core deposit intangibles for the nine months ended September 30, 2017 and the year ended December 31, 2016 were as follows:

	Goodwill		Core Deposit Intangibles
	(Dollars in thousands)
Balance as of December 31, 2015	$	1,868,827	$	49,417
Less:
Amortization		—		(9,200	)
Add:
Acquisition of Tradition Bancshares, Inc.		32,018		5,567
Balance as of December 31, 2016		1,900,845		45,784
Less:
Amortization		—		(5,320	)
Add:
Measurement period adjustments		—		—
Balance as of September 30, 2017	$	1,900,845	$	40,464

Goodwill is recorded on the acquisition date of each entity. The Company may record subsequent adjustments to goodwill for amounts undeterminable at acquisition date, such as deferred taxes and real estate valuations, and therefore the goodwill amounts may change accordingly. The Company initially records the total premium paid on acquisitions as goodwill. After finalizing the valuation, core deposit intangibles are identified and reclassified from goodwill to core deposit intangibles on the balance sheet. This reclassification has no effect on total assets, liabilities, shareholders’ equity, net income or cash flows. Management performs an evaluation annually, and more frequently if a triggering event occurs, of whether any impairment of the goodwill and core deposit intangibles has occurred. If any such impairment is determined, a write-down is recorded. As of September 30, 2017, there was no impairment recorded on goodwill and core deposit intangibles.

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

The measurement period for the Company to determine the fair value of acquired identifiable assets and assumed liabilities will be at the end of the earlier of (1) twelve months from the date of acquisition or (2) as soon as the Company receives the information it was seeking about facts and circumstances that existed as of the date of acquisition.

Core deposit intangibles are being amortized on a non-pro rata basis over their estimated lives, which the Company believes is between 10 and 15 years. Amortization expense related to intangible assets totaled $1.7 million and $2.4 million for the three months ended September 30, 2017 and 2016, respectively, and $5.3 million and $7.0 million for the nine months ended September 30, 2017 and 2016, respectively. The estimated aggregate future amortization expense for core deposit intangibles remaining as of September 30, 2017 is as follows (dollars in thousands):

Remaining 2017	$	1,622
2018		5,959
2019		5,051
2020		4,483
2021		4,022
Thereafter		19,327
Total	$	40,464

8. STOCK–BASED COMPENSATION

At September 30, 2017, the Company had two stock-based employee compensation plans with awards outstanding. One of these plans has expired and therefore no additional awards may be issued under that plan.

During 2004, Bancshares’ Board of Directors established the Prosperity Bancshares, Inc. 2004 Stock Incentive Plan (the “2004 Plan”), which was approved by Bancshares’ shareholders and authorized the issuance of up to 1,250,000 shares of common stock upon the exercise of options granted under the 2004 Plan or upon the grant or exercise, as the case may be, of other awards granted under the 2004 Plan. The 2004 Plan provided for grants of incentive and nonqualified stock options to employees and nonqualified stock options to directors who are not employees. The 2004 Plan also provided for grants of shares of restricted stock, stock appreciation rights, phantom stock awards and performance awards on substantially similar terms. The 2004 Plan has expired and therefore no additional shares may be issued under the 2004 Plan.

During 2012, Bancshares’ Board of Directors established the Prosperity Bancshares, Inc. 2012 Stock Incentive Plan (the “2012 Plan”), which was approved by Bancshares’ shareholders and authorized the issuance of up to 1,250,000 shares of common stock upon the exercise of options granted under the 2012 Plan or pursuant to the grant or exercise, as the case may be, of other awards granted under the 2012 Plan, including restricted stock, stock appreciation rights, phantom stock awards and performance awards. A total of 352,235 shares have been granted under the 2012 Plan as of September 30, 2017.

The Company did not receive cash from the exercise of stock options during the three-month period ended September 30, 2017, compared with $469 thousand during the three-month period ended September 30, 2016. The Company received $148 thousand and $667 thousand from the exercise of stock options during the nine-month periods ended September 30, 2017 and 2016, respectively. There was no tax benefit realized from option exercises of the stock-based payment arrangements during the three month and nine month periods ended September 30, 2017 and 2016.

As of September 30, 2017, there was $4.3 million of total unrecognized compensation expense related to stock-based compensation arrangements. That cost is expected to be recognized over a weighted average period of 1.79 years.

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

9. CONTRACTUAL OBLIGATIONS AND OFF-BALANCE SHEET ITEMS

Contractual Obligations

The following table summarizes the Company’s contractual obligations and other commitments to make future payments as of September 30, 2017 (other than deposit obligations and securities sold under repurchase agreements). The Company’s future cash payments associated with its contractual obligations pursuant to its Federal Home Loan Bank (“FHLB”) notes payable and operating leases as of September 30, 2017 are summarized below. Payments for FHLB notes payable include interest of $439 thousand that will be paid over the future periods. Payments related to leases are based on actual payments specified in underlying contracts.

	1 year or less		More than 1 year but less than 3 years		3 years or more but less than 5 years		5 years or more		Total
	(Dollars in thousands)
Federal Home Loan Bank notes payable	$	959,453	$	756	$	428	$	167	$	960,804
Operating leases		4,811		7,630		4,207		6,638		23,286
Total	$	964,264	$	8,386	$	4,635	$	6,805	$	984,090

Off-Balance Sheet Items

In the normal course of business, the Company enters into various transactions, which, in accordance with GAAP, are not included in its consolidated balance sheets. The Company enters into these transactions to meet the financing needs of its customers. These transactions include commitments to extend credit and standby letters of credit, which involve, to varying degrees, elements of credit risk and interest rate risk in excess of the amounts recognized in the consolidated balance sheets.

The Company’s commitments associated with outstanding standby letters of credit and commitments to extend credit expiring by period as of September 30, 2017 are summarized below. Since commitments associated with letters of credit and commitments to extend credit may expire unused, the amounts shown do not necessarily reflect the actual future cash funding requirements.

	1 year or less		More than 1 year but less than 3 years		3 years or more but less than 5 years		5 years or more		Total
	(Dollars in thousands)
Standby letters of credit	$	47,196	$	14,746	$	493	$	—	$	62,435
Commitments to extend credit		922,603		326,830		236,089		678,086		2,163,608
Total	$	969,799	$	341,576	$	236,582	$	678,086	$	2,226,043

10. OTHER COMPREHENSIVE INCOME (LOSS)

The tax effects allocated to each component of other comprehensive income (loss) were as follows:

	Three Months Ended September 30,
	2017								2016
	Before Tax Amount			Tax Effect		Net of Tax Amount			Before Tax Amount			Tax Effect		Net of Tax Amount
	(Dollars in thousands)
Other comprehensive loss:
Securities available for sale:
Change in unrealized gain during period	$	(1,236	)	$	433	$	(803	)	$	(186	)	$	65	$	(121	)
Total securities available for sale		(1,236	)		433		(803	)		(186	)		65		(121	)
Total other comprehensive loss	$	(1,236	)	$	433	$	(803	)	$	(186	)	$	65	$	(121	)

PROSPERITY BANCSHARES, INC.® AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2017

(UNAUDITED)

	Nine Months Ended September 30,
	2017								2016
	Before Tax Amount			Tax Effect		Net of Tax Amount			Before Tax Amount			Tax Effect		Net of Tax Amount
	(Dollars in thousands)
Other comprehensive loss:
Securities available for sale:
Change in unrealized gain during period	$	(536	)	$	188	$	(348	)	$	(828	)	$	290	$	(538	)
Total securities available for sale		(536	)		188		(348	)		(828	)		290		(538	)
Total other comprehensive loss	$	(536	)	$	188	$	(348	)	$	(828	)	$	290	$	(538	)

Activity in accumulated other comprehensive income associated with securities available for sale, net of tax, was as follows:

	Securities Available for Sale			Accumulated Other Comprehensive Income
	(Dollars in thousands)
Balance at January 1, 2017	$	1,411		$	1,411
Other comprehensive income		(348	)		(348	)
Balance at September 30, 2017	$	1,063		$	1,063

Balance at January 1, 2016	$	2,040		$	2,040
Other comprehensive income		(538	)		(538	)
Balance at September 30, 2016	$	1,502		$	1,502

11. ACQUISITIONS

Acquisition of Tradition Bancshares, Inc. — On January 1, 2016, the Company completed the acquisition of Tradition and its wholly-owned subsidiary Tradition Bank, headquartered in Houston, Texas. Tradition Bank operated 7 banking offices in the Houston, Texas area, including its main office in Bellaire, 3 banking centers in Katy and 1 banking center in The Woodlands. The acquisition was not considered significant to the Company’s financial statements and therefore pro forma financial data and related disclosures are not included.

Under the terms of the definitive agreement, Bancshares issued 679,528 shares of its common stock plus $39.0 million in cash for all outstanding shares of Tradition capital stock, for total merger consideration of $71.5 million, based on Bancshares’ closing stock price of $47.86 on December 31, 2015. As of September 30, 2017, total goodwill related to the Tradition acquisition was $32.0 million. Goodwill is calculated as the excess of both the consideration exchanged and liabilities assumed as compared to the fair value of identifiable assets acquired, none of which is expected to be deductible for tax purposes. Additionally, the Company recognized $5.6 million of core deposit intangibles during 2016.

ITEM 2.MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Special Cautionary Notice Regarding Forward-Looking Statements

Statements and financial discussion and analysis contained in this quarterly report on Form 10-Q that are not historical facts are forward-looking statements made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements are based on assumptions and involve a number of risks and uncertainties, many of which are beyond the Company’s control. Forward-looking statements can be identified by words such as “believes,” “intends,” “expects,” “plans,” “will” and similar references to future periods. Many possible events or factors could affect the future financial results and performance of the Company and could cause such results or performance to differ materially from those expressed in the forward-looking statements. These possible events or factors include, but are not limited to:

•

changes in the strength of the United States economy in general and the strength of the local economies in which the Company conducts operations resulting in, among other things, a deterioration in credit quality or reduced demand for credit, including the result and effect on the Company’s loan portfolio and allowance for credit losses;

•

changes in interest rates and market prices, which could reduce the Company’s net interest margins, asset valuations and expense expectations;

•

changes in the levels of loan prepayments and the resulting effects on the value of the Company’s loan portfolio;

•

changes in local economic and business conditions, including commodity prices, which adversely affect the Company’s customers and their ability to transact profitable business with the Company, including the ability of the Company’s borrowers to repay their loans according to their terms or a change in the value of the related collateral;

•

increased competition for deposits and loans adversely affecting rates and terms;

•

the timing, impact and other uncertainties of any future acquisitions, including the Company’s ability to identify suitable future acquisition candidates, the success or failure in the integration of their operations, and the ability to enter new markets successfully and capitalize on growth opportunities;

•

the possible impairment of goodwill associated with an acquisition and possible adverse short-term effects on the results of operations;

•

increased credit risk in the Company’s assets and increased operating risk caused by a material change in commercial, consumer and/or real estate loans as a percentage of the total loan portfolio;

•

the concentration of the Company’s loan portfolio in loans collateralized by real estate;

•

the failure of assumptions underlying the establishment of and provisions made to the allowance for credit losses;

•

changes in the availability of funds resulting in increased costs or reduced liquidity;

•

a deterioration or downgrade in the credit quality and credit agency ratings of the securities in the Company’s securities portfolio;

•

increased asset levels and changes in the composition of assets and the resulting impact on the Company’s capital levels and regulatory capital ratios;

•

the Company’s ability to acquire, operate and maintain cost effective and efficient systems without incurring unexpectedly difficult or expensive but necessary technological changes;

•

the loss of senior management or operating personnel and the potential inability to hire qualified personnel at reasonable compensation levels;

•

government intervention in the U.S. financial system;

•

changes in statutes and government regulations or their interpretations applicable to financial holding companies and the Company’s present and future banking and other subsidiaries, including changes in tax requirements and tax rates;

•

poor performance by external vendors;

•

the failure of analytical and forecasting models and tools used by the Company to estimate probable credit losses and to measure the fair value of financial instruments;

•

additional risks from new lines of businesses or new products and services;

•

claims or litigation related to intellectual property or fiduciary responsibilities;

•

the failure of the Company’s enterprise risk management framework to identify or address risks adequately;

•

a failure in or breach of operational or security systems of the Company’s infrastructure, or those of its third-party vendors and other service providers, including as a result of cyber attacks;

•

potential risk of environmental liability associated with lending activities;

•

acts of terrorism, an outbreak of hostilities or other international or domestic calamities, weather or other acts of God and other matters beyond the Company’s control; and

•

other risks and uncertainties described in the Annual Report on Form 10-K or in the Company’s other reports and documents filed with the Securities and Exchange Commission.

A forward-looking statement may include a statement of the assumptions or bases underlying the forward-looking statement. The Company believes it has chosen these assumptions or bases in good faith and that they are reasonable. However, the Company cautions that assumptions or bases almost always vary from actual results, and the differences between assumptions or bases and actual results can be material. Therefore, the Company cautions against placing undue reliance on its forward-looking statements. The forward-looking statements speak only as of the date the statements are made. The Company undertakes no obligation to publicly update or otherwise revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Management’s Discussion and Analysis of Financial Condition and Results of Operations analyzes the major elements of the Company’s balance sheets and statements of income. This section should be read in conjunction with the Company’s consolidated financial statements and accompanying notes included elsewhere in this report and with the consolidated financial statements and accompanying notes and other detailed information appearing in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016.

OVERVIEW

Prosperity Bancshares, Inc., a Texas corporation, was formed in 1983 to acquire the former Allied First Bank in Edna, Texas, which was chartered in 1949 as The First National Bank of Edna and is now known as Prosperity Bank. The Company is a registered financial holding company that derives substantially all of its revenues and income from the operation of its bank subsidiary, Prosperity Bank. The Bank provides a wide array of financial products and services to small and medium-sized businesses and consumers. As of September 30, 2017, the Bank operated 243 full-service banking locations; with 65 in the Houston area, including The Woodlands; 29 in the South Texas area including Corpus Christi and Victoria; 34 in the Dallas/Fort Worth area; 22 in the East Texas area; 29 in the Central Texas area including Austin and San Antonio; 34 in the West Texas area including Lubbock, Midland-Odessa and Abilene; 16 in the Bryan/College Station area, 6 in the Central Oklahoma area and 8 in the Tulsa, Oklahoma area. The Company’s principal executive office is located at Prosperity Bank Plaza, 4295 San Felipe in Houston, Texas and its telephone number is (281) 269-7199. The Company’s website address is www.prosperitybankusa.com. Information contained on the Company’s website is not incorporated by reference into this quarterly report on Form 10-Q and is not part of this or any other report.

The Company generates the majority of its revenues from interest income on loans, service charges and fees on customer accounts and income from investment in securities. The revenues are partially offset by interest expense paid on deposits and other borrowings and noninterest expenses such as administrative and occupancy expenses. Net interest income is the difference between interest income on earning assets such as loans and securities and interest expense on liabilities such as deposits and borrowings which are used to fund those assets. Net interest income is the Company’s largest source of revenue. The level of interest rates and the volume and mix of earning assets and interest-bearing liabilities impact net interest income and margin.

Three principal components of the Company’s growth strategy are internal growth, efficient operations and acquisitions, including strategic merger transactions. The Company focuses on continual internal growth. The Company maintains separate data with respect to each banking center’s net interest income, efficiency ratio, deposit growth and loan growth for purposes of measuring its overall profitability. Banking center presidents and managers are accountable for performance in these areas and compensated accordingly. The Company also focuses on maintaining efficiency and stringent cost control practices and policies. The Company has centralized many of its critical operations, such as data processing and loan processing. Management believes that this centralized infrastructure can accommodate substantial additional growth and achieve necessary controls while enabling the Company to minimize operational costs through certain economies of scale. The Company also intends to continue to seek expansion opportunities. During 2016, the Company completed the acquisition of Tradition Bancshares, Inc., which added 7 banking centers after consolidation.

Total assets were $22.14 billion at September 30, 2017 compared with $22.33 billion at December 31, 2016, a decrease of $187.8 million or 0.8%. Total loans were $9.91 billion at September 30, 2017 compared with $9.62 billion at December 31, 2016, an increase of $289.1 million or 3.0%. Total deposits were $16.91 billion at September 30, 2017 compared with $17.31 billion at December 31, 2016, a decrease of $399.8 million or 2.3%. Total shareholders’ equity was $3.78 billion at September 30, 2017 compared with $3.64 billion at December 31, 2016, an increase of $139.0 million or 3.8%.

CRITICAL ACCOUNTING POLICIES

The Company’s significant accounting policies are integral to understanding the financial results reported. The Company’s accounting policies are described in detail in Note 1 to the consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016. The Company believes that of its significant accounting policies, the following may involve a higher degree of judgment and complexity:

Allowance for Credit Losses — The allowance for credit losses is a valuation established through charges to earnings in the form of a provision for credit losses. The Company’s allowance for credit losses consists of two elements, (1) specific valuation allowances based on probable losses on impaired loans and (2) a general valuation allowance based on historical loan loss experience, general economic conditions and other qualitative risk factors both internal and external to the Company. The allowance for acquired credit losses is calculated as described under the heading “Accounting for Acquired Loans and the Allowance for Acquired Credit Losses” below. Management has established an allowance for credit losses which it believes is adequate for estimated losses in the Company’s loan portfolio. Based on an evaluation of the portfolio, management presents a quarterly review of the allowance for credit losses to the Bank’s Board of Directors, indicating any change in the allowance since the last review and any recommendations as to adjustments in the allowance. In making its evaluation, management considers factors such as historical loan loss experience, the amount of nonperforming assets and related collateral, the volume, growth and composition of the portfolio, current economic conditions that may affect the borrower’s ability to pay and the value of collateral, the evaluation of the portfolio through its internal loan review process and other relevant factors. Portions of the allowance may be allocated for specific credits; however, the entire allowance is available for any credit that, in management’s judgment, should be charged off. Charge-offs occur when loans are deemed to be uncollectible. For further discussion of the methodology used in the determination of the allowance for credit losses, see “Financial Condition – Allowance for Credit Losses” below.

Accounting for Acquired Loans and the Allowance for Acquired Credit Losses — The Company accounts for its acquisitions using the acquisition method of accounting. Accordingly, the assets, including loans, and liabilities of the acquired entity were recorded at their fair values at the acquisition date. No allowance for credit losses related to the acquired loans is recorded on the acquisition date, as the fair value of the acquired loans incorporates assumptions regarding credit risk. These fair value estimates associated with acquired loans, and based on a discounted cash flow model, include estimates related to market interest rates and undiscounted projections of future cash flows that incorporate expectations of prepayments and the amount and timing of principal, interest and other cash flows, as well as any shortfalls thereof.

At period-end after acquisition, the fair-valued acquired loans from each acquisition are reassessed to determine whether an addition to the allowance for credit losses is appropriate due to further credit quality deterioration. For further discussion of the methodology used in the determination of the allowance for credit losses for acquired loans, see “Financial Condition – Allowance for Credit Losses” below.

Goodwill and Intangible Assets—Goodwill and intangible assets that have indefinite useful lives are subject to an impairment test at least annually, or more often, if events or circumstances indicate that it is more likely than not that the fair value of the Company’s reporting unit is below the carrying value of its equity. Under Accounting Standards Codification (“ASC”) topic 350-20, “Intangibles—Goodwill and Other—Goodwill,” companies have the option to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining the need to perform step one of the annual test for goodwill impairment. An entity has an unconditional option to bypass the qualitative assessment for any reporting unit in any period and proceed directly to performing the first step of the goodwill impairment test. An entity may resume performing the qualitative assessment in any subsequent period.

If the Company bypasses the qualitative assessment, a two-step goodwill impairment test is performed. The two-step process begins with an estimation of the fair value of the Company’s reporting unit compared with its carrying value. If the carrying amount exceeds the fair value of the reporting unit, a second test is completed comparing the implied fair value of the reporting unit’s goodwill to its carrying value to measure the amount of impairment.

Estimating the fair value of the Company’s reporting unit is a subjective process involving the use of estimates and judgments, particularly related to future cash flows of the reporting unit, discount rates (including market risk premiums) and market multiples. Material assumptions used in the valuation tools include the comparable public company price multiples used in the terminal value, future cash flows and the market risk premium component of the discount rate. The estimated fair value of the reporting unit is determined using a blend of two commonly used valuation techniques: the market approach and the income approach. The Company gives consideration to both valuation techniques, as either technique can be an indicator of value. For the market approach, valuations of the reporting unit were based on an analysis of relevant price multiples in market trades in companies with similar characteristics. For the income approach, estimated future cash flows (derived from internal forecasts and economic expectations) and terminal value (value at the end of the cash flow period, based on price multiples) were discounted. The discount rate was based on the imputed cost of equity capital.

The Company had no intangible assets with indefinite useful lives at September 30, 2017. Core deposit intangible assets that are subject to amortization are being amortized on a non-pro rata basis over the years expected to be benefited, which the Company believes is between ten and fifteen years. These core deposit intangible assets are reviewed for impairment if circumstances indicate their value may not be recoverable based on a comparison of fair value to carrying value. Based on the Company’s annual goodwill impairment test as of September 30, 2017, management does not believe any of its goodwill is impaired as of September 30, 2017 because the fair value of the Company’s equity exceeded its carrying value. While the Company believes no impairment existed at September 30, 2017 under accounting standards applicable at that date, different conditions or assumptions, or changes in cash flows or profitability, if significantly negative or unfavorable, could have a material adverse effect on the outcome of the Company’s impairment evaluation and financial condition or future results of operations.

Other-Than-Temporarily Impaired Securities—When the fair value of a security is below its amortized cost, and depending on the length of time the condition exists and the extent the fair market value is below amortized cost, additional analysis is performed to determine whether an impairment exists. Available for sale and held to maturity securities are analyzed quarterly for possible other-than-temporary impairment. The analysis considers (1) the length of time and the extent to which the fair value has been less than cost, (2) the financial condition and near-term prospects of the issuer, (3) whether the market decline was affected by macroeconomic conditions, and (4) whether the entity has the intent to sell the debt security or more likely than not will be required to sell the debt security before its anticipated recovery. Often, the information available to conduct these assessments is limited and rapidly changing, making estimates of fair value subject to judgment. If actual information or conditions are different than estimated, the extent of the impairment of the security may be different than previously estimated, which could have a material effect on the Company’s results of operations and financial condition.

Fair Values of Financial Instruments—The Company determines the fair market values of financial instruments based on the fair value hierarchy established which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. There are three levels of inputs that may be used to measure fair value. Level 1 inputs include quoted market prices, where available. If such quoted market prices are not available Level 2 inputs are used. These inputs are based upon internally developed analytical tools that primarily use observable market-based parameters. Level 3 inputs are unobservable inputs which are typically based on an entity’s own assumptions, as there is little, if any, related market activity. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the asset or liability.

2016 ACQUISITION

Acquisition of Tradition Bancshares, Inc. – On January 1, 2016, the Company completed the acquisition of Tradition Bancshares, Inc. (“Tradition”) and its wholly-owned subsidiary Tradition Bank headquartered in Houston, Texas. Tradition Bank operated 7 banking offices in the Houston, Texas area, including its main office in Bellaire, 3 banking centers in Katy and 1 banking center in The Woodlands. As of December 31, 2015, Tradition, on a consolidated basis, reported total assets of $548.0 million, total loans of $253.3 million and total deposits of $488.9 million, each at book value.

HURRICANE HARVEY

On August 25, 2017, Hurricane Harvey came ashore in Rockport, Texas impacting numerous communities along the Texas Gulf coast. Prosperity Bank operates 94 banking centers in the Houston and South Texas areas, which include Beaumont, Corpus Christi and Victoria. All except one of those banking centers are currently operational. As of September 30, 2017, the Company has not experienced any material financial impact related to Hurricane Harvey.

RESULTS OF OPERATIONS

Net income available to common shareholders was $67.9 million ($0.98 per common share on a diluted basis) for the quarter ended September 30, 2017 compared with $68.7 million ($0.99 per common share on a diluted basis) for the quarter ended September 30, 2016, a decrease in net income of $743 thousand or 1.1%. The Company posted annualized returns on average common equity of 7.20% and 7.66%, annualized returns on average assets of 1.22% and 1.27% and efficiency ratios of 41.92% and 43.26% for the quarters ended September 30, 2017 and 2016, respectively. The efficiency ratio is calculated by dividing total non-interest expense by the sum of net interest income and non-interest income. Because the ratio is a measure of revenues and expenses resulting from our lending activities and fee-based banking services, net gains and losses on the sale of assets and securities are not included. Additionally, taxes are not part of this calculation.

For the nine months ended September 30, 2017, net income available to common shareholders was $205.0 million ($2.95 per common share on a diluted basis) compared with $205.7 million ($2.95 per common share on a diluted basis) for the same period in 2016, a decrease in net income of $646 thousand or 0.3%. The Company posted annualized returns on average common equity of 7.34% and 7.74%, annualized returns on average assets of 1.22% and 1.25% and efficiency ratios of 42.42% and 42.24% for the nine months ended September 30, 2017 and 2016, respectively.

Net Interest Income

The Company’s net interest income is affected by changes in the amount and mix of interest-earning assets and interest-bearing liabilities, referred to as a “volume change.” It is also affected by changes in yields earned on interest-earning assets and rates paid on interest-bearing deposits and other borrowed funds, referred to as a “rate change.”

For the Three Months Ended September 30, 2017

Net interest income before the provision for credit losses was $156.1 million for the quarter ended September 30, 2017, an increase of $2.1 million or 1.4%, compared with $154.1 million for the same period in 2016.

Interest income on loans was $121.6 million for the quarter ended September 30, 2017, an increase of $5.3 million or 4.6%, compared with $116.2 million for the same period in 2016. This increase was primarily due to a 3.0% increase in average loans.

Interest income on securities was $50.6 million for the quarter ended September 30, 2017, an increase of $2.5 million or 5.1%, compared with $48.1 million for the same period in 2016. This increase was primarily due to a 3.5% increase in average investment securities.

Average interest-bearing liabilities were $12.97 billion for the quarter ended September 30, 2017, an increase of $148.0 million or 1.2%, compared with $12.83 billion for the same period in 2016. The net interest margin on a tax-equivalent basis decreased from 3.29% for the quarter ended September 30, 2016 to 3.22% for the quarter ended September 30, 2017. This change was primarily due to an increase in the average rates on interest-bearing liabilities.

For the Nine Months Ended September 30, 2017

Net interest income before the provision for credit losses was $460.8 million for the nine months ended September 30, 2017, a decrease of $18.0 million or 3.8%, compared with $478.8 million for the same period in 2016.

Interest income on loans was $348.3 million for the nine months ended September 30, 2017, a decrease of $10.8 million or 3.0%, compared with $359.1 million for the same period in 2016. This decrease was primarily due to a decrease in loan discount accretion of $14.3 million. The Company had $40.0 million of total outstanding discounts on acquired loans, of which $31.4 million was accretable at September 30, 2017.

Interest income on securities was $156.7 million for the nine months ended September 30, 2017, an increase of $4.9 million or 3.2%, compared with $151.8 million for the same period in 2016. This was primarily due to a 3.3% increase in average investment securities.

Average interest-bearing liabilities were $13.26 billion for the nine months ended September 30, 2017, an increase of $93.2 million or 0.7%, compared with $13.17 billion for the same period in 2016. The net interest margin on a tax-equivalent basis decreased from 3.38% for the nine months ended September 30, 2016 to 3.18% for the nine months ended September 30, 2017. This change was primarily due to a decrease in loan discount accretion and an increase in the average rate on interest-bearing liabilities.

The following tables present, for the periods indicated, the total dollar amount of average balances, interest income from average interest-earning assets and the resultant yields, as well as the interest expense on average interest-bearing liabilities, expressed in both dollars and rates. Except as indicated in the footnotes, no tax-equivalent adjustments were made and all average balances are daily average balances. Any nonaccruing loans have been included in the table as loans carrying a zero yield.

	Three Months Ended September 30,
	2017								2016
	Average Outstanding Balance			Interest Earned/Paid		Average Yield/Rate ⁽¹⁾			Average Outstanding Balance			Interest Earned/Paid		Average Yield/Rate ⁽¹⁾
	(Dollars in thousands)
Assets
Interest-Earning Assets:
Loans	$	9,888,922		$	121,567		4.88	%	$	9,601,628		$	116,247		4.82	%
Investment securities		9,526,215			50,610		2.11	%		9,203,253			48,132		2.08	%
Federal funds sold and other earning assets		77,337			242		1.24	%		72,171			81		0.45	%
Total interest-earning assets		19,492,474			172,419		3.51	%		18,877,052			164,460		3.47	%
Allowance for credit losses		(84,047	)							(84,476	)
Noninterest-earning assets		2,801,852								2,804,773
Total assets	$	22,210,279							$	21,597,349

Liabilities and Shareholders' Equity
Interest-Bearing Liabilities:
Interest-bearing demand deposits	$	3,601,116		$	3,003		0.33	%	$	3,858,821		$	2,280		0.24	%
Savings and money market deposits		5,658,569			5,259		0.37	%		5,610,342			3,753		0.27	%
Certificates and other time deposits		2,270,114			4,114		0.72	%		2,492,889			3,363		0.54	%
Other borrowings		1,099,583			3,540		1.28	%		532,301			752		0.56	%
Securities sold under repurchase agreements		344,177			356		0.41	%		331,254			248		0.30	%
Total interest-bearing liabilities		12,973,559			16,272		0.50	%		12,825,607			10,396		0.32	%
Noninterest-Bearing Liabilities:
Noninterest-bearing demand deposits		5,361,362								5,070,094
Other liabilities		102,046								118,881
Total liabilities		18,436,967								18,014,582
Shareholders' equity		3,773,312								3,582,767
Total liabilities and shareholders' equity	$	22,210,279							$	21,597,349

Net interest rate spread							3.01	%							3.15	%

Net interest income and margin ^{(2) (3)}				$	156,147		3.18	%				$	154,064		3.25	%

Net interest income and margin (tax equivalent) ⁽⁴⁾				$	158,087		3.22	%				$	155,994		3.29	%

______________

(1) Annualized and based on average balances on an actual 365-day or 366-day basis for the three months ended September 30, 2017 and 2016.

(2) Yield is based on amortized cost and does not include any component of unrealized gains or losses.

(3) The net interest margin is equal to net interest income divided by average interest-earning assets.

(4) In order to make pretax income and resultant yields on tax-exempt investments and loans comparable to those on taxable investments and loans, a tax-equivalent adjustment has been computed using a federal income tax rate of 35%.

	Nine Months Ended September 30,
	2017								2016
	Average Outstanding Balance			Interest Earned/Interest Paid		Average Yield/Rate ⁽¹⁾			Average Outstanding Balance			Interest Earned/Interest Paid		Average Yield/Rate ⁽¹⁾
	(Dollars in thousands)
Assets
Interest-Earning Assets:
Loans	$	9,777,432		$	348,252		4.76	%	$	9,653,891		$	359,066		4.97	%
Investment securities		9,735,912			156,679		2.15	%		9,422,744			151,802		2.15	%
Federal funds sold and other earning assets		80,651			585		0.97	%		73,608			242		0.44	%
Total interest-earning assets		19,593,995		$	505,516		3.45	%		19,150,243		$	511,110		3.57	%
Allowance for credit losses		(84,391	)							(83,801	)
Noninterest-earning assets		2,838,422								2,856,117
Total assets	$	22,348,026							$	21,922,559

Liabilities and Shareholders' Equity
Interest-Bearing Liabilities:
Interest-bearing demand deposits	$	3,826,963		$	8,338		0.29	%	$	4,135,579		$	7,633		0.25	%
Savings and money market deposits		5,572,534			13,673		0.33	%		5,721,341			11,470		0.27	%
Certificates and other time deposits		2,310,777			11,714		0.68	%		2,529,353			10,544		0.56	%
Other borrowings		1,227,652			10,056		1.10	%		461,491			1,944		0.56	%
Securities sold under repurchase agreements		325,606			922		0.38	%		319,948			694		0.29	%
Junior subordinated debentures		—			—		—			2,591			37		1.91	%
Total interest-bearing liabilities		13,263,532			44,703		0.45	%		13,170,303			32,322		0.33	%
Noninterest-Bearing Liabilities:
Noninterest-bearing demand deposits		5,264,649								5,085,041
Other liabilities		93,463								122,076
Total liabilities		18,621,644								18,377,420
Shareholders' equity		3,726,382								3,545,139
Total liabilities and shareholders' equity	$	22,348,026							$	21,922,559

Net interest rate spread							3.00	%							3.24	%

Net interest income and margin ^{(2) (3)}				$	460,813		3.14	%				$	478,788		3.34	%

Net interest income and margin (tax equivalent) ⁽⁴⁾				$	466,737		3.18	%				$	484,522		3.38	%

___________

(1) Annualized and based on average balances on an actual 365-day or 366-day basis for the nine months ended September 30, 2017 and 2016.

(2) Yield is based on amortized cost and does not include any component of unrealized gains or losses.

(3) The net interest margin is equal to net interest income divided by average interest-earning assets.

The following table presents information regarding the dollar amount of changes in interest income and interest expense for the periods indicated for each major component of interest-earning assets and interest-bearing liabilities and distinguishes between the changes attributable to changes in volume and changes in interest rates. For purposes of this table, changes attributable to both rate and volume which cannot be segregated have been allocated to rate.

	Three Months Ended September 30,								Nine Months Ended September 30,
	2017 vs. 2016								2017 vs. 2016
	Increase								Increase
	(Decrease)								(Decrease)
	Due to Change in								Due to Change in
	Volume			Rate			Total		Volume			Rate			Total
	(Dollars in thousands)
Interest-Earning Assets:
Loans ⁽¹⁾	$	3,488		$	1,832		$	5,320	$	4,591		$	(15,405	)	$	(10,814	)
Investment securities ⁽¹⁾		1,694			784			2,478		5,041			(164	)		4,877
Federal funds sold and other earning assets		6			155			161		23			320			343
Total increase (decrease) in interest income		5,188			2,771			7,959		9,655			(15,249	)		(5,594	)

Interest-Bearing Liabilities:
Interest-bearing demand deposits		(153	)		876			723		(569	)		1,274			705
Savings and money market deposits		32			1,474			1,506		(298	)		2,501			2,203
Certificates and other time deposits ⁽¹⁾		(301	)		1,052			751		(910	)		2,080			1,170
Other borrowings		804			1,984			2,788		3,225			4,887			8,112
Securities sold under repurchase agreements		10			98			108		12			216			228
Junior subordinated debentures		—			—			—		(37	)		—			(37	)
Total increase in interest expense		392			5,484			5,876		1,423			10,958			12,381
Increase (decrease) in net interest income	$	4,796		$	(2,713	)	$	2,083	$	8,232		$	(26,207	)	$	(17,975	)

(1) Includes impact of purchase accounting adjustments.

Provision for Credit Losses

Management actively monitors the Company’s asset quality and provides specific loss provisions when necessary. Provisions for credit losses are charged to income to bring the total allowance for credit losses to a level deemed appropriate by management of the Company based on such factors as historical credit loss experience, industry diversification of the Company’s commercial loan portfolio, the amount of nonperforming loans and related collateral, the volume growth and composition of the loan portfolio, current economic conditions that may affect the borrower’s ability to pay and the value of collateral, the evaluation of the loan portfolio through the internal loan review process and other relevant factors.

Loans are charged off against the allowance for credit losses when appropriate. Although management believes it uses the best information available to make determinations with respect to the provision for credit losses, future adjustments may be necessary if economic conditions differ from the assumptions used in making the initial determinations.

The Company recorded a $6.9 million provision for credit losses for the quarter ended September 30, 2017 and a $2.0 million provision for credit losses for the quarter ended September 30, 2016. Net charge-offs were $3.9 million for the quarter ended September 30, 2017 compared with net charge-offs of $241 thousand for the quarter ended September 30, 2016. The Company made a $12.3 million provision for credit losses for the nine months ended September 30, 2017 and a $22.0 million provision for credit losses for the nine months ended September 30, 2016. Net charge-offs were $10.8 million for the nine months ended September 30, 2017 compared with $17.8 million for the nine months ended September 30, 2016. See "Financial Condition – Allowance for Credit Losses" below for more information.

Noninterest Income

The Company’s primary sources of recurring noninterest income are nonsufficient funds (“NSF”) fees, credit, debit and ATM card income and service charges on deposit accounts. Additionally, the Company generates recurring noninterest income from its trust, mortgage and brokerage lines of business. Noninterest income does not include loan origination fees which are recognized over the life of the related loan as an adjustment to yield using the interest method. Noninterest income totaled $28.8 million for the three months ended September 30, 2017 compared with $29.7 million for the same period in 2016, a decrease of $875 thousand or 2.9%. This change was primarily due to a decrease in mortgage income. Noninterest income totaled $87.4 million for the nine months ended

September 30, 2017 compared with $89.0 million for the same period in 2016, a decrease of $1.5 million or 1.7%. This change was primarily due to the net loss on sale of assets and a decrease in brokerage and mortgage income, partially offset by the gain on sale of securities and an increase in service charges on deposit accounts.

The following table presents, for the periods indicated, the major categories of noninterest income:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017			2016
	(Dollars in thousands)
Nonsufficient funds (NSF) fees	$	8,350	$	8,764	$	24,244		$	24,984
Credit card, debit card and ATM card income		6,075		5,903		18,214			17,659
Service charges on deposit accounts		5,251		4,698		16,077			13,898
Trust income		2,040		1,851		6,466			5,640
Mortgage income		854		2,143		3,227			5,386
Brokerage income		461		1,213		1,376			3,789
Bank owned life insurance income		1,366		1,417		4,083			4,273
Net gain (loss) on sale of assets		62		37		(1,962	)		1,389
Gain on sale of securities		—		—		3,270			—
Other		4,350		3,658		12,418			11,932
Total noninterest income	$	28,809	$	29,684	$	87,413		$	88,950

Noninterest Expense

Noninterest expense totaled $77.5 million for the quarter ended September 30, 2017 compared with $79.5 million for the quarter ended September 30, 2016, a decrease of $2.0 million or 2.5%. This change was primarily due to a decrease in amortization of core deposit intangibles and salaries and benefits. Noninterest expense totaled $232.0 million for the nine months ended September 30, 2017 compared with $239.2 million for the nine months ended September 30, 2016, a decrease of $7.2 million or 3.0%. The change was primarily due to decreases in salaries and benefits, amortization of core deposit intangibles and communications expense.

The following table presents, for the periods indicated, the major categories of noninterest expense:

	Three Months Ended September 30,					Nine Months Ended September 30,
	2017			2016		2017		2016
	(Dollars in thousands)
Salaries and employee benefits ⁽¹⁾	$	47,866		$	48,328	$	143,653	$	146,666
Non-staff expenses:
Net occupancy and equipment		5,691			5,997		16,654		17,362
Credit and debit card, data processing and software amortization		4,506			4,207		12,807		12,801
Regulatory assessments and FDIC insurance		3,455			3,434		10,552		10,311
Core deposit intangibles amortization		1,686			2,418		5,320		6,974
Depreciation		3,050			3,289		9,204		9,924
Communications ⁽²⁾		2,618			2,870		7,984		8,790
Other real estate expense		(30	)		44		112		136
Other		8,667			8,889		25,727		26,275
Total noninterest expense	$	77,509		$	79,476	$	232,013	$	239,239

(1) Includes stock-based compensation expense of $1.7 million and $2.1 million for the three months ended September 30, 2017 and 2016, respectively, and $5.1 million and $7.2 million for the nine months ended September 30, 2017 and 2016, respectively.

(2) Communications expense includes telephone, data circuits, postage and courier expenses.

Income Taxes

Income tax expense totaled $32.6 million for the three months ended September 30, 2017 compared with $33.6 million for the same period in 2016, a decrease of $982 thousand or 2.9%. Income tax expense totaled $98.9 million for the nine months ended September 30, 2017 compared with $100.8 million for the same period in 2016, a decrease of $2.0 million or 1.9%. The Company’s effective tax rate for the three and nine months ended September 30, 2017 and 2016 was 32.5% and 32.9%, respectively.

FINANCIAL CONDITION

Loan Portfolio

The Company separates its loan portfolio into two general categories of loans: (1) “legacy loans,” which are loans originated by Prosperity Bank and made pursuant to the Company’s loan policy and procedures in effect at the time the loan was made, and (2) “acquired loans,” which are loans acquired in a business combination and preliminarily recorded at fair value at acquisition date. Those acquired loans that are renewed or substantially modified after the date of the business combination, thereby subjecting them to the Company’s allowance for credit losses methodology, are referred to as “acquired legacy loans.” If a renewal or substantial modification of an acquired loan is underwritten by the Company with a new credit analysis, the loan will no longer be categorized as an acquired loan. For example, acquired loans to one borrower may be combined into a new loan with a new loan number and categorized as a legacy loan. Acquired loans with a fair value discount or premium at the date of the business combination that remained at the reporting date are referred to as “fair-valued acquired loans.” All fair-valued acquired loans are further categorized into “PCI loans” (purchased credit-impaired loans) and “Non-PCI loans.” Acquired loans with evidence of credit quality deterioration at acquisition for which it is probable that the Company would not be able to collect all contractual amounts due are PCI loans.

The following tables summarize the Company’s legacy and acquired loan portfolios broken out into legacy loans, acquired legacy loans, Non-PCI loans and PCI loans, as of the dates indicated.

	September 30, 2017
			Acquired Loans
	Legacy Loans		Acquired Legacy Loans		Non-PCI Loans		PCI Loans		Total Loans
	(Dollars in thousands)
Residential mortgage loans held for sale	$	25,473	$	—	$	—	$	—	$	25,473
Commercial and industrial		1,171,915		240,056		57,311		3,115		1,472,397
Real estate:
Construction, land development and other land loans		1,384,272		25,310		42,975		978		1,453,535
1-4 family residential (includes home equity)		2,389,945		80,576		232,466		4,667		2,707,654
Commercial real estate (includes multi-family residential)		2,582,290		334,617		363,909		14,185		3,295,001
Farmland		428,520		14,882		59,943		382		503,727
Agriculture		154,112		33,703		974		—		188,789
Consumer and other		219,487		29,237		15,902		—		264,626
Total loans held for investment		8,330,541		758,381		773,480		23,327		9,885,729
Total	$	8,356,014	$	758,381	$	773,480	$	23,327	$	9,911,202

	December 31, 2016
			Acquired Loans
	Legacy Loans		Acquired Legacy Loans		Non-PCI Loans		PCI Loans		Total Loans
	(Dollars in thousands)
Residential mortgage loans held for sale	$	26,975	$	—	$	—	$	—	$	26,975
Commercial and industrial		1,135,846		284,898		115,011		3,684		1,539,439
Real estate:
Construction, land development and other land loans		1,152,873		42,990		66,629		1,431		1,263,923
1-4 family residential (includes home equity)		2,289,107		83,785		312,254		5,710		2,690,856
Commercial real estate (includes multi-family residential)		2,352,094		300,773		492,822		16,420		3,162,109
Farmland		396,353		19,363		68,484		388		484,588
Agriculture		135,835		49,795		2,118		—		187,748
Consumer and other		214,905		29,175		22,342		—		266,422
Total loans held for investment		7,677,013		810,779		1,079,660		27,633		9,595,085
Total	$	7,703,988	$	810,779	$	1,079,660	$	27,633	$	9,622,060

At September 30, 2017, total loans were $9.91 billion, an increase of $289.1 million or 3.0%, compared with $9.62 billion at December 31, 2016. Loans at September 30, 2017 included $25.5 million of loans held for sale compared with $27.0 million at December 31, 2016. At September 30, 2017, loans represented 44.8% of total assets compared with 43.1% of total assets at December 31, 2016.

The loan portfolio consist of various types of loans categorized by major type as follows:

(i) Commercial and Industrial Loans. In nearly all cases, the Company’s commercial loans are made in the Company’s market areas and are underwritten on the basis of the borrower’s ability to service the debt from income. As a general practice, the Company takes as collateral a lien on any available real estate, equipment or other assets owned by the borrower and obtains a personal guaranty of the borrower or principal. Working capital loans are primarily collateralized by short-term assets whereas term loans are primarily collateralized by long-term assets. In general, commercial loans involve more credit risk than residential mortgage loans and commercial mortgage loans and, therefore, usually yield a higher return. The increased risk in commercial loans is due to the type of collateral securing these loans as well as the expectation that commercial loans generally will be serviced principally from the operations of the business, and those operations may not be successful. Historical trends have shown these types of loans to have higher delinquencies than mortgage loans. As a result of these additional complexities, variables and risks, commercial loans require more thorough underwriting and servicing than other types of loans.

Included in commercial and industrial loans are (1) commitments to oil and gas producers secured by proven, developed and producing reserves and (2) commitments to service, equipment and midstream companies secured mainly by accounts receivable, inventory and equipment. Mineral reserve values supporting commitments to producers are normally re-determined semi-annually using reserve studies prepared by a third-party or the Company’s oil and gas engineer. Accounts receivable and inventory borrowing bases for service companies are typically re-determined monthly. Funding requests by both producers and service companies are monitored relative to the most recently determined borrowing base. As of September 30, 2017, oil and gas loans totaled $291.8 million or 2.9% of total loans, of which $106.5 million were to production companies and $185.3 million were to service companies. This compares with total oil and gas loans of $284.5 million or 3.0% of total loans as of December 31, 2016, of which $119.9 million were to production companies and $164.6 million were to service companies. In addition, as of September 30, 2017, the Company had total unfunded commitments to oil and gas companies of $164.4 million, of which $63.8 million were to production companies and $100.6 million were to service companies. This compares with total unfunded commitments to oil and gas companies of $145.5 million as of December 31, 2016, of which $72.1 million were to production companies and $73.4 million were to service companies. Total unfunded commitments to producers include letters of credit issued in lieu of oil well plugging bonds.

(ii) Commercial Real Estate. The Company makes commercial real estate loans collateralized by owner-occupied and nonowner-occupied real estate to finance the purchase of real estate. The Company’s commercial real estate loans are collateralized by first liens on real estate, typically have variable interest rates (or five year or less fixed rates) and amortize over a 15- to 20-year period. Payments on loans secured by nonowner-occupied properties are often dependent on the successful operation or management of the properties. Accordingly, repayment of these loans may be subject to adverse conditions in the real estate market or the economy to a greater extent than other types of loans. The Company seeks to minimize these risks in a variety of ways, including giving careful consideration to the property’s operating history, future operating projections, current and projected occupancy, location and physical condition in connection with underwriting these loans. The underwriting analysis also includes credit verification, analysis of global cash flow, appraisals and a review of the financial condition of the borrower. At September 30, 2017, approximately 45.8% of the outstanding principal balance of the Company’s commercial real estate loans were secured by owner-occupied properties.

(iii) 1-4 Family Residential Loans. The Company’s lending activities also include the origination of 1-4 family residential mortgage loans (including home equity loans) collateralized by owner-occupied residential properties located in the Company’s market areas. The Company offers a variety of mortgage loan portfolio products which generally are amortized over five to 25 years. Loans collateralized by 1-4 family residential real estate generally have been originated in amounts of no more than 89% of appraised value or have mortgage insurance. The Company requires mortgage title insurance and hazard insurance. The Company retains these portfolio loans for its own account rather than selling them into the secondary market. By doing so, the Company incurs interest rate risk as well as the risks associated with nonpayments on such loans. The Company’s Home Loan Center offers a variety of mortgage loan products which are generally amortized over 30 years, including FHA and VA loans. The Company sells the loans originated by the Home Loan Center into the secondary market.

(iv) Construction, Land Development and Other Land Loans. The Company makes loans to finance the construction of residential and, to a lesser extent, nonresidential properties. Construction loans generally are collateralized by first liens on real estate and have floating interest rates. The Company conducts periodic inspections, either directly or through an agent, prior to approval of periodic draws on these loans. Underwriting guidelines similar to those described above are also used in the Company’s construction lending activities. Construction loans involve additional risks attributable to the fact that loan funds are advanced upon the security of a project under construction, and the project is of uncertain value prior to its completion. Because of uncertainties inherent in estimating construction costs, the market value of the completed project and the effects of governmental regulation on real property, it can be difficult to accurately evaluate the total funds required to complete a project and the related loan to value ratio. As a result of these uncertainties, construction lending often involves the disbursement of substantial funds with repayment dependent, in part, on the success of the ultimate project rather than the ability of a borrower or guarantor to repay the loan. If the Company is forced to foreclose on a project prior to completion, the Company may not be able to recover all of the unpaid portion of the loan. In addition, the Company may be required to fund additional amounts to complete a project and may have to hold the property for an indeterminate period of time. Although the Company has underwriting procedures designed to identify what it believes to be acceptable levels of risks in construction lending, these procedures may not prevent losses from the risks described above.

(v) Agriculture Loans. The Company provides agriculture loans for short-term beef and crop production, including rice, cotton, milo and corn, farm equipment financing and agriculture real estate financing. The Company evaluates agriculture borrowers primarily based on their historical profitability, level of experience in their particular agriculture industry, overall financial capacity and the availability of secondary collateral to withstand economic and natural variations common to the industry. Because agriculture loans present a higher level of risk associated with events caused by nature, the Company routinely makes on-site visits and inspections in order to identify and monitor such risks.

(vi) Consumer Loans. Consumer loans made by the Company include direct “A”-credit automobile loans, recreational vehicle loans, boat loans, home improvement loans, personal loans (collateralized and uncollateralized), credit cards and deposit account collateralized loans. The terms of these loans typically range from 12 to 180 months and vary based upon the nature of collateral and size of loan. Generally, consumer loans entail greater risk than do real estate secured loans, particularly in the case of consumer loans that are unsecured or collateralized by rapidly depreciating assets such as automobiles. In such cases, any repossessed collateral for a defaulted consumer loan may not provide an adequate source of repayment for the outstanding loan balance. The remaining deficiency often does not warrant further substantial collection efforts against the borrower beyond obtaining a deficiency judgment. In addition, consumer loan collections are dependent on the borrower’s continuing financial stability, and thus are more likely to be adversely affected by job loss, divorce, illness or personal bankruptcy. Furthermore, the application of various federal and state laws may limit the amount which can be recovered on such loans.

The Company maintains an independent loan review department that reviews and validates the credit risk program on a periodic basis. Results of these reviews are presented to management. The loan review process complements and reinforces the risk identification and assessment decisions made by lenders and credit personnel, as well as the Company’s policies and procedures.

Nonperforming Assets

Nonperforming assets include loans on nonaccrual status, accruing loans 90 days or more past due, repossessed assets and real estate which has been acquired through foreclosure and is awaiting disposition. Nonperforming assets do not include PCI loans unless the timing and amount of projected cash flows can no longer be reasonably estimated. PCI loans become subject to the Company's allowance for credit losses methodology when a deterioration in projected cash flows is identified.

Nonperforming assets decreased $2.5 million or 5.1%, to $45.8 million, at September 30, 2017 compared with $48.3 million at December 31, 2016, of which $26.2 million and $24.0 million, respectively, were attributable to acquired loans.

The following tables present information regarding nonperforming assets differentiated among legacy loans, acquired legacy loans, Non-PCI loans and PCI loans, as of the dates indicated:

	September 30, 2017
				Acquired Loans
	Legacy Loans			Acquired Legacy Loans			Non-PCI Loans			PCI Loans			Total
	(Dollars in thousands)
Nonaccrual loans ⁽¹⁾	$	5,223		$	17,607		$	1,863		$	1,574		$	26,267
Accruing loans 90 or more days past due		33			4,901			—			—			4,934
Total nonperforming loans		5,256			22,508			1,863			1,574			31,201
Repossessed assets		94			—			16			—			110
Other real estate		14,261			—			200			51			14,512
Total nonperforming assets	$	19,611		$	22,508		$	2,079		$	1,625		$	45,823

Nonperforming assets to total loans and other real estate by category		0.23	%		2.97	%		0.27	%		6.95	%		0.46	%

	December 31, 2016
				Acquired Loans
	Legacy Loans			Acquired Legacy Loans			Non-PCI Loans			PCI Loans			Total
	(Dollars in thousands)
Nonaccrual loans ⁽¹⁾	$	9,983		$	12,703		$	6,210		$	2,746		$	31,642
Accruing loans 90 or more days past due		903			—			53			—			956
Total nonperforming loans		10,886			12,703			6,263			2,746			32,598
Repossessed assets		—			225			16			—			241
Other real estate		13,442			1,178			70			773			15,463
Total nonperforming assets	$	24,328		$	14,106		$	6,349		$	3,519		$	48,302

Nonperforming assets to total loans and other real estate by category		0.32	%		1.74	%		0.59	%		12.39	%		0.50	%

(1) Includes troubled debt restructurings of $4.4 million and $97 thousand as of September 30, 2017 and December 31, 2016, respectively.

Nonperforming assets were 0.46% of total loans and other real estate at September 30, 2017 compared with 0.50% of total loans and other real estate at December 31, 2016. The allowance for credit losses as a percentage of total nonperforming loans was 278.2% at September 30, 2017 and 261.8% at December 31, 2016.

Allowance for Credit Losses

The allowance for credit losses is a valuation established through charges to earnings in the form of a provision for credit losses. The amount of the allowance for credit losses is affected by the following: (1) charge-offs of loans that occur when loans are deemed uncollectible and decrease the allowance, (2) recoveries on loans previously charged off that increase the allowance and (3) provisions for credit losses charged to earnings that increase the allowance. Based on an evaluation of the loan portfolio and consideration of the factors listed below, management presents a quarterly review of the allowance for credit losses to the Bank’s Board of Directors, indicating any change in the allowance since the last review and any recommendations as to adjustments in the allowance. Although management believes it uses the best information available to make determinations with respect to the allowance for credit losses, future adjustments may be necessary if economic conditions or the borrower’s performance differ from the assumptions used in making the initial determinations.

The Company’s allowance for credit losses consists of two components: a specific valuation allowance based on probable losses on specifically identified loans and a general valuation allowance based on historical loan loss experience, general economic conditions and other qualitative risk factors both internal and external to the Company.

In setting the specific valuation allowance, the Company follows a loan review program to evaluate the credit risk in the total loan portfolio and assigns risk grades to each loan. Through this loan review process, the Company maintains an internal list of impaired loans which, along with the delinquency list of loans, helps management assess the overall quality of the loan portfolio and the adequacy of the allowance for credit losses. All loans that have been identified as impaired are reviewed on a quarterly basis in order to determine whether a specific reserve is required. For certain impaired loans, the Company allocates a specific loan loss reserve primarily based on the value of the collateral securing the impaired loan. The specific reserves are determined on an individual loan basis. Loans for which specific reserves are provided are excluded from the general valuation allowance described below.

In determining the amount of the general valuation allowance, management considers factors such as historical loan loss experience, concentration risk of specific loan types, the volume, growth and composition of the Company’s loan portfolio, current economic conditions that may affect the borrower’s ability to pay and the value of collateral, the evaluation of the Company’s loan portfolio through its internal loan review process, general economic conditions and other qualitative risk factors both internal and external to the Company and other relevant factors. Based on a review of these factors for each loan type, the Company applies an estimated percentage to the outstanding balance of each loan type, excluding any loan that has a specific reserve allocated to it. The Company uses this information to establish the amount of the general valuation allowance.

A change in the allowance for credit losses can be attributable to several factors, most notably (1) specific reserves identified for impaired loans, (2) historical credit loss information, (3) changes in environmental factors and (4) growth in the balance of legacy loans and the re-categorization of fair-valued acquired loans to acquired legacy loans, which subjects such loans to the allowance methodology.

Changes in the Company’s asset quality are reflected in the allowance in several ways. Specific reserves that are calculated on a loan-by-loan basis and the qualitative assessment of all other loans reflect current changes in the credit quality of the loan portfolio. Historical credit losses, on the other hand, are based on a three-year look back period, which are then applied to estimate current credit losses inherent in the loan portfolio. A deterioration in the credit quality of the loan portfolio in the current period would increase the historical credit loss factor to be applied in future periods, just as an improvement in credit quality would decrease the historical credit loss factor.

The allowance for credit losses is further determined by the size of the loan portfolio subject to the allowance methodology and environmental factors that include Company-specific risk indicators and general economic conditions, both of which are constantly changing. The Company evaluates the economic and portfolio-specific factors on a quarterly basis to determine a qualitative component of the general valuation allowance. The factors include economic metrics, business conditions, delinquency trends, credit concentrations, nature and volume of the portfolio and other adjustments for items not covered by specific reserves and historical loss experience. Management’s assessment of qualitative factors is a statistically based approach to determine the inherent probable loss associated with such factors. Based on the Company’s actual historical loan loss experience relative to economic and loan portfolio-specific factors at the time the losses occurred, management is able to identify the probabilities of default and loss severity based on current economic conditions. The correlation of historical loss experience with current economic conditions provides an estimate of inherent and probable losses that has not been previously factored into the general valuation allowance by the determination of specific reserves and recent historical losses. Additionally, the Company considers qualitative factors not easily quantified and the possibility of model imprecision.

Utilizing the aggregation of specific reserves, historical loss experience and a qualitative component, management is able to determine the valuation allowance to reflect the full inherent probable loss.

In determining the allowance for credit losses, management also considers the type of loan (legacy or acquired) and the credit quality of the loan. The Company distinguishes between legacy loans and acquired legacy loans, which are accounted for under the contractual yield method, and fair-valued acquired loans consisting of Non-PCI loans and PCI loans, which are accounted for as purchased loans.

Loans acquired in business combinations are initially recorded at fair value, which includes an estimate of inherent credit losses expected to be realized over the remaining lives of the loans, and therefore no corresponding allowance for credit losses is recorded for these loans at acquisition. When a fair-valued acquired loan is renewed at its maturity date, the loan is re-categorized as an acquired legacy loan. When a fair-valued acquired loan is modified after acquisition, the loan is independently evaluated subsequent to the modification decision to determine whether the modification was substantial, and therefore, requires that the loan be re-categorized as an acquired legacy loan. This determination is based on a discounted cash-flow analysis. Generally, when a change in discounted cash-flow of greater than 10% is identified, the fair-valued acquired loan becomes categorized as an acquired legacy loan. If and when a fair-valued acquired loan becomes an acquired legacy loan, the acquired legacy loan is evaluated at the time of renewal or modification in accordance with the Company’s allowance for credit losses methodology described above.

Non-PCI loans that were not deemed impaired subsequent to the acquisition date are considered non-impaired and are evaluated as part of the general valuation allowance. Non-PCI loans that have not become impaired subsequent to acquisition are segregated into a pool for each acquisition for allowance calculation purposes. For each pool, the Company estimates a hypothetical allowance for credit losses also referred to as an “indicated reserve” that is calculated in accordance with GAAP requirements. The Company uses the acquired bank’s past loss history adjusted for qualitative factors to establish the indicated reserve. The indicated reserve for each pool of Non-PCI loans is compared with the remaining discount for the respective pool to test for credit quality deterioration and the possible need for a loan loss provision. To the extent the remaining discount of the pool is greater than the indicated reserve, no additional allowance is necessary. If the remaining discount of the pool is less than the indicated reserve, the difference results in an increase to the allowance recorded through a provision for credit losses.

Non-PCI loans that have deteriorated to an impaired status subsequent to acquisition are evaluated for a specific reserve on a quarterly basis which, when identified, is added to the allowance for credit losses. The Company reviews impaired Non-PCI loans on a loan-by-loan basis and determines the specific reserve based on the difference between the recorded investment in the loan and one of three factors: expected future cash flows, observable market price or fair value of the collateral. Because essentially all of the Company’s impaired Non-PCI loans have been collateral-dependent, the amount of the specific reserve historically has been determined by comparing the fair value of the collateral securing the Non-PCI loan with the recorded investment in such loan. In the future, the Company will continue to analyze impaired Non-PCI loans on a loan-by-loan basis and may use an alternative measurement method to determine the specific reserve, as appropriate and in accordance with applicable accounting standards.

PCI loans are individually monitored on a quarterly basis to assess for deterioration subsequent to acquisition and are only subject to the Company’s allowance methodology when a deterioration in projected cash flows is identified. If a deterioration in projected cash flows is identified, an additional provision for credit losses is made. PCI loans were recorded at their acquisition date fair values, which were based on expected cash flows and included estimates of expected future credit losses. The Company’s estimates of loan fair values at the acquisition date may be adjusted for a period of up to one year as the Company continues to evaluate its estimate of expected future cash flows at the acquisition date. If the Company determines that losses arose after the acquisition date, the additional losses will be reflected as a provision for credit losses. An allowance for credit losses is not calculated for PCI loans that have not experienced deterioration subsequent to the acquisition date. See “Critical Accounting Policies” above for more information.

As described in the section captioned “Critical Accounting Policies” above, the Company’s determination of the allowance for credit losses involves a high degree of judgment and complexity. The Company’s analysis of qualitative, or environmental, factors on pools of loans with common risk characteristics, in combination with the quantitative historical loss information and specific reserves, provides the Company with an estimate of inherent losses. The allowance must reflect changes in the balance of loans subject to the allowance methodology, as well as the estimated imminent losses associated with those loans.

The following tables present, as of and for the periods indicated, information regarding the allowance for credit losses differentiated between legacy loans and acquired loans. The charge-offs and recoveries with respect to the acquired loans shown below are primarily from acquired legacy loans. Reported net charge-offs may include those from Non-PCI loans and PCI loans, but only if the total charge-off required is greater than the remaining discount.

	As of and for the Nine Months Ended September 30, 2017
	Legacy			Acquired
	Loans			Loans			Total
	(Dollars in thousands)
Average loans outstanding	$	8,061,284		$	1,716,148		$	9,777,432
Gross loans outstanding at end of period	$	8,356,014		$	1,555,188		$	9,911,202
Allowance for credit losses at beginning of period	$	73,846		$	11,480		$	85,326
Provision for credit losses		6,965			5,360			12,325
Charge-offs:
Commercial and industrial		(5,396	)		(4,717	)		(10,113	)
Real estate and agriculture		(206	)		(146	)		(352	)
Consumer and other		(2,456	)		(30	)		(2,486	)
Recoveries:
Commercial and industrial		694			168			862
Real estate and agriculture		266			165			431
Consumer and other		790			29			819
Net charge-offs		(6,308	)		(4,531	)		(10,839	)
Allowance for credit losses at end of period	$	74,503		$	12,309		$	86,812
Ratio of allowance to end of period loans		0.89	%		0.79	%		0.88	%
Ratio of net charge-offs to average loans (annualized)		0.10	%		0.35	%		0.15	%
Ratio of allowance to end of period nonperforming loans		1,417.5	%		47.4	%		278.2	%

	As of and for the Nine Months Ended September 30, 2016
	Legacy			Acquired
	Loans			Loans			Total
	(Dollars in thousands)
Average loans outstanding	$	7,351,260		$	2,302,631		$	9,653,891
Gross loans outstanding at end of period	$	7,471,943		$	2,076,371		$	9,548,314
Allowance for credit losses at beginning of period	$	64,909		$	16,475		$	81,384
Provision for credit losses		18,367			3,633			22,000
Charge-offs:
Commercial and industrial		(3,409	)		(7,232	)		(10,641	)
Real estate and agriculture		(7,283	)		(121	)		(7,404	)
Consumer and other		(4,273	)		(98	)		(4,371	)
Recoveries:
Commercial and industrial		928			1,315			2,243
Real estate and agriculture		1,451			15			1,466
Consumer and other		902			6			908
Net charge-offs		(11,684	)		(6,115	)		(17,799	)
Allowance for credit losses at end of period	$	71,592		$	13,993		$	85,585
Ratio of allowance to end of period loans		0.96	%		0.67	%		0.90	%
Ratio of net charge-offs to average loans (annualized)		0.21	%		0.35	%		0.25	%
Ratio of allowance to end of period nonperforming loans		530.3	%		46.1	%		195.2	%

The Company had gross charge-offs on legacy loans of $8.1 million during the nine months ended September 30, 2017. Partially offsetting these charge-offs were recoveries on legacy loans of $1.8 million. Gross charge-offs on acquired loans were $4.9 million during the nine months ended September 30, 2017. Partially offsetting these charge-offs were recoveries on acquired loans of $362 thousand. Total charge-offs for the nine months ended September 30, 2017 were $13.0 million, partially offset by total recoveries of $2.1 million.

The following tables show the allocation of the allowance for credit losses among various categories of loans disaggregated between legacy loans, acquired legacy loans, Non-PCI loans and PCI loans at the dates indicated. The allocation is made for analytical purposes and is not necessarily indicative of the categories in which future losses may occur. The total allowance is available to absorb losses from any loan category, regardless of whether allocated to a legacy loan or an acquired loan.

	September 30, 2017
			Acquired Loans
	Legacy Loans		Acquired Legacy Loans		Non-PCI Loans		PCI Loans		Total Allowance		Percent of Loans to Total Loans
	(Dollars in thousands)
Balance of allowance for credit losses applicable to:
Commercial and industrial	$	31,485	$	9,369	$	—	$	—	$	40,854		14.8	%
Real estate		38,285		2,137		50		—		40,472		75.5	%
Agriculture and agriculture real estate		3,273		720		—		—		3,993		7.0	%
Consumer and other		1,460		33		—		—		1,493		2.7	%
Total allowance for credit losses	$	74,503	$	12,259	$	50	$	—	$	86,812		100.0	%

	December 31, 2016
			Acquired Loans
	Legacy Loans		Acquired Legacy Loans		Non-PCI Loans		PCI Loans		Total Allowance		Percent of Loans to Total Loans
	(Dollars in thousands)
Balance of allowance for credit losses applicable to:
Commercial and industrial	$	28,049	$	7,690	$	66	$	31	$	35,836		16.0	%
Real estate		41,254		2,455		102		—		43,811		74.2	%
Agriculture and agriculture real estate		2,982		1,074		17		—		4,073		7.0	%
Consumer and other		1,561		45		—		—		1,606		2.8	%
Total allowance for credit losses	$	73,846	$	11,264	$	185	$	31	$	85,326		100.0	%

At September 30, 2017, the allowance for credit losses totaled $86.8 million compared with $85.3 million at December 31, 2016, an increase of $1.5 million or 1.7%. The allowance for credit losses at September 30, 2017 totaled 0.88% of total loans compared with 0.89% of total loans at December 31, 2016.

At September 30, 2017, $74.5 million of the allowance was attributable to legacy loans compared with $73.8 million of the allowance at December 31, 2016, an increase of $657 thousand or 0.9%. This change was primarily attributable to an increase in legacy loan balances. At September 30, 2017, $12.3 million of the allowance for credit losses was attributable to acquired legacy loans compared with $11.3 million of the allowance at December 31, 2016, an increase of $995 thousand or 8.8%. This change was primarily attributable to an increase in specific reserves identified for loans with deteriorated credit quality. At September 30, 2017, $50 thousand of the allowance for credit losses was attributable to Non-PCI loans compared with $185 thousand of the allowance at December 31, 2016, a decrease of $135 thousand or 73.0%. This change was primarily attributable to a decrease in specific reserves. At September 30, 2017, none of the allowance for credit losses was attributable to PCI loans compared with $31 thousand of the allowance at December 31, 2016, a decrease of $31 thousand or 100.0%. This decrease was attributable to the charge off of one loan with a specific reserve identified at December 31, 2016.

At September 30, 2017, the Company had $40.0 million of total outstanding discounts on Non-PCI and PCI loans, of which $31.4 million was accretable.

The Company believes that the allowance for credit losses at September 30, 2017 is adequate to cover estimated losses in the loan portfolio as of such date. Nevertheless, the Company could sustain losses in future periods which could be substantial in relation to the size of the allowance at September 30, 2017.

Securities

The carrying cost of securities totaled $9.41 billion at September 30, 2017 compared with $9.73 billion at December 31, 2016, a decrease of $315.6 million or 3.2%. At September 30, 2017, securities represented 42.5% of total assets compared with 43.6% of total assets at December 31, 2016.

The amortized cost and fair value of investment securities were as follows:

	September 30, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(Dollars in thousands)
Available for Sale
States and political subdivisions	$	1,816	$	4	$	—		$	1,820
Collateralized mortgage obligations		104,976		187		(55	)		105,108
Mortgage-backed securities		112,636		1,491		(35	)		114,092
Other securities		12,588		126		(83	)		12,631
Total	$	232,016	$	1,808	$	(173	)	$	233,651
Held to Maturity
U.S. Treasury securities and obligations of U.S. Government agencies	$	32,177	$	432	$	—		$	32,609
States and political subdivisions		331,293		6,281		(31	)		337,543
Collateralized mortgage obligations		697		6		(3	)		700
Mortgage-backed securities		8,812,704		40,648		(69,479	)		8,783,873
Other securities		—		—		—			—
Total	$	9,176,871	$	47,367	$	(69,513	)	$	9,154,725

	December 31, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(Dollars in thousands)
Available for Sale
States and political subdivisions	$	1,915	$	5	$	—		$	1,920
Collateralized mortgage obligations		120,478		240		(119	)		120,599
Mortgage-backed securities		84,024		2,004		(165	)		85,863
Other securities		12,588		252		(46	)		12,794
Total	$	219,005	$	2,501	$	(330	)	$	221,176
Held to Maturity
U.S. Treasury securities and obligations of U.S. Government agencies	$	33,523	$	497	$	—		$	34,020
States and political subdivisions		384,015		3,934		(1,328	)		386,621
Collateralized mortgage obligations		850		6		(5	)		851
Mortgage-backed securities		9,086,422		30,880		(199,439	)		8,917,863
Other securities		100		—		—			100
Total	$	9,504,910	$	35,317	$	(200,772	)	$	9,339,455

Management evaluates securities for other-than-temporary impairment (“OTTI”) at least on a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. In determining OTTI, management considers many factors, including: (1) the length of time and the extent to which the fair value has been less than cost, (2) the financial condition and near-term prospects of the issuer, (3) whether the market decline was affected by macroeconomic conditions, and (4) whether the entity has the intent to sell the debt security or more likely than not will be required to sell the debt security before its anticipated recovery. The assessment of whether an other-than-temporary decline exists involves a high degree of subjectivity and judgment and is based on the information available to management at a point in time.

recognized in earnings. The amount of the total OTTI related to the noncredit portion is recognized in other comprehensive income, net of applicable taxes. The previous amortized cost basis less the OTTI recognized in earnings will become the new amortized cost basis of the investment.

Management has the ability and intent to hold the securities classified as held-to-maturity until they mature, at which time the Company will receive full value for the securities. Furthermore, as of September 30, 2017, management does not have the intent to sell any of the securities classified as available for sale before a recovery of cost. In addition, management believes it is more likely than not that the Company will not be required to sell any of its investment securities before a recovery of cost. The unrealized losses are largely due to increases in market interest rates over the yields available at the time the underlying securities were purchased. The fair value is expected to recover as the securities approach their maturity date or repricing date or if market yields for such investments decline. Management does not believe any of the securities are impaired due to reasons of credit quality. Accordingly, as of September 30, 2017, management believes any impairment in the Company’s securities is temporary, and therefore no impairment loss has been realized in the Company’s consolidated statements of income.

Deposits

Total deposits were $16.91 billion at September 30, 2017 compared with $17.31 billion at December 31, 2016, a decrease of $399.8 million or 2.3%. At September 30, 2017, noninterest-bearing deposits totaled $5.47 billion compared with $5.19 billion at December 31, 2016, an increase of $274.5 million or 5.3%. Interest-bearing deposits totaled $11.44 billion at September 30, 2017 compared with $12.12 billion at December 31, 2016, a decrease of $674.3 million or 5.6%.

Average deposits for the nine months ended September 30, 2017 were $16.97 billion, a decrease of $496.4 million or 2.8%, compared with $17.47 billion for the nine months ended September 30, 2016. This change was primarily due to a decrease in municipal account balances. The ratio of average interest-bearing deposits to total average deposits was 69.0% during the first nine months of 2017 compared with 70.9% during the first nine months of 2016.

The following table summarizes the daily average balances and weighted average rates paid on deposits for the periods indicated below:

	Nine Months Ended September 30,
	2017					2016
	Average Balance		Average Rate ⁽¹⁾			Average Balance		Average Rate ⁽¹⁾
	(Dollars in thousands)
Interest-bearing demand deposits	$	3,826,963		0.29	%	$	4,135,579		0.25	%
Regular savings		2,201,219		0.29	%		2,014,314		0.25	%
Money market savings		3,371,315		0.35	%		3,707,027		0.28	%
Certificates, IRAs and other time deposits		2,310,777		0.68	%		2,529,353		0.56	%
Total interest-bearing deposits		11,710,274		0.39	%		12,386,273		0.32	%
Noninterest-bearing deposits		5,264,649					5,085,041
Total deposits	$	16,974,923		0.27	%	$	17,471,314		0.23	%

(1) Annualized and based on average balances on an actual 365-day or 366-day basis for the nine months ended September 30, 2017 and 2016.

Other Borrowings

The following table presents the Company’s borrowings as of the dates indicated:

	September 30, 2017		December 31, 2016
	(Dollars in thousands)
FHLB advances	$	955,000	$	985,000
FHLB long-term notes payable		5,365		5,781
Total other borrowings		960,365		990,781
Securities sold under repurchase agreements		334,621		320,430
Total	$	1,294,986	$	1,311,211

FHLB advances and long-term notes payable— The Company has an available line of credit with the FHLB of Dallas, which allows the Company to borrow on a collateralized basis. FHLB advances are considered short-term borrowings and are used to manage liquidity as needed. Maturing advances are replaced by drawing on available cash, making additional borrowings or through increased customer deposits. At September 30, 2017, the Company had total funds of $5.82 billion available under this agreement, of

which $960.4 million was outstanding. FHLB advances of $955.0 million were outstanding at September 30, 2017, at a weighted average rate of 1.19%. Long-term notes payable were $5.4 million at September 30, 2017, with a weighted average rate of 5.69%. The maturity dates on the FHLB notes payable range from the years 2018 to 2027 and have interest rates ranging from 4.51% to 6.10%.

Securities sold under repurchase agreements— At September 30, 2017, the Company had $334.6 million in securities sold under repurchase agreements with banking customers compared with $320.4 million at December 31, 2016, an increase of $14.2 million or 4.4%. Repurchase agreements are generally settled on the following business day; however, approximately $11.0 million of the repurchase agreements outstanding at September 30, 2017 have maturity dates ranging from 6 to 24 months. All securities sold under agreements to repurchase are collateralized by certain pledged securities.

Liquidity

Liquidity involves the Company’s ability to raise funds to support asset growth or reduce assets to meet deposit withdrawals and other payment obligations, to maintain reserve requirements and otherwise to operate the Company on an ongoing basis. The Company’s largest source of funds is deposits and its largest use of funds is loans. The Company does not expect a change in the source or use of its funds in the future. Although access to purchased funds from correspondent banks is available and has been utilized on occasion to take advantage of investment opportunities, the Company does not generally rely on this external funding source. The cash and federal funds sold position, supplemented by amortizing investment and loan portfolios, has generally created an adequate liquidity position.

As of September 30, 2017, the Company had outstanding $2.16 billion in commitments to extend credit and $62.4 million in commitments associated with outstanding standby letters of credit. Since commitments associated with letters of credit and commitments to extend credit may expire unused, the total outstanding may not necessarily reflect the actual future cash funding requirements.

The Company has no exposure to future cash requirements associated with known uncertainties or capital expenditures of a material nature.

Asset liquidity is provided by cash and assets which are readily marketable or which will mature in the near future. As of September 30, 2017, the Company had cash and cash equivalents of $303.5 million compared with $437.4 million at December 31, 2016, a decrease of $133.9 million or 30.6%. The decrease was primarily due to the purchase of held-to-maturity securities of $1.07 billion, the net decrease in interest-bearing deposits of $674.1 million and the net increase in loans held for investment of $284.8 million. Partially offsetting the decrease were proceeds from maturities and principal paydowns of held-to-maturity securities, the net increase in noninterest-bearing deposits of $274.5 million and net income of $205.0 million for the nine months ended September 30, 2017.

Contractual Obligations

The following table summarizes the Company’s contractual obligations and other commitments to make future payments as of September 30, 2017 (other than deposit obligations). The payments do not include pre-payment options that may be available to the Company. The Company’s future cash payments associated with its contractual obligations pursuant to its FHLB borrowings and operating leases as of September 30, 2017 are summarized below. Payments for FHLB borrowings include interest of $439 thousand that will be paid over the future periods. Payments related to leases are based on actual payments specified in underlying contracts.

	1 year or less		More than 1 year but less than 3 years		3 years or more but less than 5 years		5 years or more		Total
	(Dollars in thousands)
Federal Home Loan Bank notes payable	$	959,453	$	756	$	428	$	167	$	960,804
Operating leases		4,811		7,630		4,207		6,638		23,286
Total	$	964,264	$	8,386	$	4,635	$	6,805	$	984,090

Off-Balance Sheet Items

In the normal course of business, the Company enters into various transactions that, in accordance with GAAP, are not included in its consolidated balance sheets. The Company enters into these transactions to meet the financing needs of its customers. These transactions include commitments to extend credit and standby letters of credit, which involve, to varying degrees, elements of credit risk and interest rate risk in excess of the amounts recognized in the consolidated balance sheets.

The Company’s commitments associated with outstanding standby letters of credit and commitments to extend credit as of September 30, 2017 are summarized below. Since commitments associated with letters of credit and commitments to extend credit may expire unused, the amounts shown do not necessarily reflect the actual future cash funding requirements:

	1 year or less		More than 1 year but less than 3 years		3 years or more but less than 5 years		5 years or more		Total
	(Dollars in thousands)
Standby letters of credit	$	47,196	$	14,746	$	493	$	—	$	62,435
Commitments to extend credit		922,603		326,830		236,089		678,086		2,163,608
Total	$	969,799	$	341,576	$	236,582	$	678,086	$	2,226,043

Capital Resources

Total shareholders’ equity was $3.78 billion at September 30, 2017 compared with $3.64 billion at December 31, 2016, an increase of $139.0 million or 3.8%. The increase was primarily the result of net income of $205.0 million, partially offset by dividends paid on common stock of $70.9 million for the nine months ended September 30, 2017.

The Basel III Capital Rules adopted by the federal regulatory authorities in 2013 substantially revised the risk-based capital requirements applicable to the Company and the Bank. The Basel III Capital Rules became effective for the Company on January 1, 2015, subject to a phase-in period for certain provisions. The Basel III Capital Rules require a capital conservation buffer with respect to each of the Common Equity Tier 1, Tier 1 risk-based and total risk-based capital ratios, which provides for capital levels that exceed the minimum risk-based capital adequacy requirements. The capital conservation buffer is subject to a three-year phase-in period that began on January 1, 2016 and will be fully phased-in on January 1, 2019 at 2.5%. The required phase-in capital conservation buffer during 2017 is 1.25%. A financial institution with a conservation buffer of less than the required amount will be subject to limitations on capital distributions, including dividend payments and stock repurchases, and certain discretionary bonus payments to executive officers.

Financial institutions are categorized by the FDIC based on minimum Common Equity Tier 1, Tier 1 risk-based, total risk-based and Tier 1 leverage ratios. As of September 30, 2017, the Bank’s capital ratios were above the levels required for the Bank to be designated as “well capitalized.”

The following table provides a comparison of the Company’s and the Bank’s risk-weighted and leverage capital ratios to the minimum and well-capitalized regulatory standards as of September 30, 2017:

	Minimum Required For Capital Adequacy Purposes				Minimum Required Plus Capital Conservation Buffer for 2017			To Be Categorized As Well Capitalized Under Prompt Corrective Action Provisions			Actual Ratio as of September 30, 2017
The Company
CET1 capital (to risk weighted assets)		4.50	%			5.75	%	N/A				15.10	%
Tier 1 capital (to risk weighted assets)		6.00	%			7.25	%	N/A				15.10	%
Total capital (to risk weighted assets)		8.00	%			9.25	%	N/A				15.81	%
Tier 1 capital (to average assets)		4.00	%	⁽¹⁾		4.00	%	N/A				9.15	%

The Bank
CET1 capital (to risk weighted assets)		4.50	%			5.75	%		6.50	%		14.99	%
Tier 1 capital (to risk weighted assets)		6.00	%			7.25	%		8.00	%		14.99	%
Total capital (to risk weighted assets)		8.00	%			9.25	%		10.00	%		15.69	%
Tier 1 capital (to average assets)		4.00	%	⁽²⁾		4.00	%		5.00	%		9.08	%

(1) The Federal Reserve Board may require the Company to maintain a leverage ratio above the required minimum.

(2) The FDIC may require the Bank to maintain a leverage ratio above the required minimum.

ITEM 3.

QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

The Company manages market risk, which for the Company is primarily interest rate risk, through its Asset Liability Committee consisting of senior officers of the Company, in accordance with policies approved by the Company’s Board of Directors.

The Company uses simulation analysis to examine the potential effects of market changes on net interest income and market value. The Company considers macroeconomic variables, Company strategy, liquidity and other factors as it quantifies market risk. See Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Interest Rate Sensitivity and Liquidity” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016, filed on February 28, 2017 (the “2016 Form 10-K”), for further discussion. There have been no material changes in the Company’s market risk exposures that would affect the quantitative and qualitative disclosures from those disclosed in the 2016 Form 10-K and presented as of December 31, 2016.

ITEM 4.

CONTROLS AND PROCEDURES

Evaluation of disclosure controls and procedures. As of the end of the period covered by this report, the Company carried out an evaluation, under the supervision and with the participation of its management, including its Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of its disclosure controls and procedures. In designing and evaluating the disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and management was required to apply judgment in evaluating its controls and procedures. Based on this evaluation, the Company’s Chief Executive Officer and Chief Financial Officer concluded that the Company’s disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) were effective as of the end of the period covered by this report.

Changes in internal control over financial reporting. There were no changes in the Company’s internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the quarter ended September 30, 2017 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

PART II—OTHER INFORMATION

ITEM 1.

LEGAL PROCEEDINGS

The Company and the Bank are defendants, from time to time, in legal actions arising from transactions conducted in the ordinary course of business. After consultations with legal counsel, the Company and the Bank believe that the ultimate liability, if any, arising from such actions will not have a material adverse effect on their financial statements.

ITEM 1A.

RISK FACTORS

There have been no material changes in the Company’s risk factors from those disclosed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016.

ITEM 2.

UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

a. None.

b. None.

c. None.

ITEM 3.

DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4.

MINE SAFETY DISCLOSURES

Not applicable.

ITEM 5.

OTHER INFORMATION

None.

ITEM 6.

EXHIBITS

Exhibit Number		Description of Exhibit

3.1		Amended and Restated Articles of Incorporation of Prosperity Bancshares, Inc. (incorporated herein by reference to Exhibit 3.1 to the Company’s Registration Statement on Form S-1 (Registration No. 333-63267) (the “Registration Statement”))

3.2		Articles of Amendment to Amended and Restated Articles of Incorporation of Prosperity Bancshares, Inc. (incorporated herein by reference to Exhibit 3.2 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2006)

3.3		Amended and Restated Bylaws of Prosperity Bancshares, Inc. (incorporated herein by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K filed on April 23, 2015)

4.1		Form of certificate representing shares of the Company’s common stock (incorporated by reference to Exhibit 4 to the Registration Statement)

31.1*		Certification of the Chief Executive Officer pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934, as amended

31.2*		Certification of the Chief Financial Officer pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934, as amended

32.1**		Certification of the Chief Executive Officer pursuant to 18 U.S.C. Section 1350, adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

32.2**		Certification of the Chief Financial Officer pursuant to 18 U.S.C. Section 1350, adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

101*		Interactive Financial Data

*	Filed with this Quarterly Report on Form 10-Q.

**	Furnished with this Quarterly Report on Form 10-Q.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		PROSPERITY BANCSHARES, INC. ^® (Registrant)

Date: 11/06/17		/S/ DAVID ZALMAN
		David Zalman
		Chairman and Chief Executive Officer

Date: 11/06/17		/S/ DAVID HOLLAWAY
		David Hollaway
		Chief Financial Officer