10-Q

Table Of Contents

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 MARCH 31, 2015

OR

☐ 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, including zip code)

(713) 693-9300

(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 or a smaller reporting company. See definitions of “accelerated filer”, “large accelerated filer” and “smaller reporting 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	☐

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 May 4, 2015, there were 70,044,190 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.	Interim Consolidated Financial Statements
	Consolidated Balance Sheets as of March 31, 2015 and December 31, 2014 (unaudited)	3
	Consolidated Statements of Income for the Three Months Ended March 31, 2015 and 2014 (unaudited)	4
	Consolidated Statements of Comprehensive Income for the Three Months Ended March 31, 2015 and 2014 (unaudited)	5
	Consolidated Statements of Changes in Shareholders’ Equity for the Three Months Ended March 31, 2015 and 2014 (unaudited)	6
	Consolidated Statements of Cash Flows for the Three Months Ended March 31, 2015 and 2014 (unaudited)	7
	Notes to Interim Consolidated Financial Statements (unaudited)	8
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	35
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	53
Item 4.	Controls and Procedures	53
PART II—OTHER INFORMATION
Item 1.	Legal Proceedings	54
Item 1A.	Risk Factors	54
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	54
Item 3.	Defaults upon Senior Securities	54
Item 4.	Mine Safety Disclosures	54
Item 5.	Other Information	54
Item 6.	Exhibits	54
Signatures		55

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PART I—FINANCIAL INFORMATION

ITEM 1.     INTERIM CONSOLIDATED FINANCIAL STATEMENTS

PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(UNAUDITED)

	March 31,			December 31,
	2015			2014
	(Dollars in thousands, except par value)
ASSETS
Cash and due from banks	$	352,642		$	677,285
Federal funds sold		1,639			569
Total cash and cash equivalents		354,281			677,854
Available for sale securities, at fair value		131,745			145,399
Held to maturity securities, at cost (fair value of $9,536,103 and $8,948,692, respectively)		9,447,751			8,900,377
Total securities		9,579,496			9,045,776
Loans held for sale		10,622			8,602
Loans held for investment		9,155,383			9,235,581
Total loans		9,166,005			9,244,183
Less: allowance for credit losses		(80,963	)		(80,762	)
Loans, net		9,085,042			9,163,421
Accrued interest receivable		48,770			51,941
Goodwill		1,881,955			1,874,191
Core deposit intangibles, net		56,458			58,947
Bank premises and equipment, net		276,468			281,549
Other real estate owned		3,010			3,237
Bank owned life insurance (BOLI)		231,439			230,095
Federal Home Loan Bank of Dallas stock		26,989			15,432
Other assets		62,951			105,290
TOTAL ASSETS	$	21,606,859		$	21,507,733
LIABILITIES AND SHAREHOLDERS’ EQUITY
LIABILITIES:
Deposits:
Noninterest-bearing	$	5,038,436		$	4,936,420
Interest-bearing		12,522,916			12,756,738
Total deposits		17,561,352			17,693,158
Other borrowings		331,914			8,724
Securities sold under repurchase agreements		318,418			315,523
Junior subordinated debentures		-			167,531
Accrued interest payable		2,225			3,190
Other liabilities		91,089			74,781
Total liabilities		18,304,998			18,262,907
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; 70,060,878 and 69,816,653 shares issued at March 31, 2015 and December 31, 2014, respectively; 70,023,790 and 69,779,565 shares outstanding at March 31, 2015 and December 31, 2014, respectively		70,061			69,817
Capital surplus		2,027,754			2,025,235
Retained earnings		1,201,211			1,146,652
Accumulated other comprehensive income—net unrealized gain on available for sale securities, net of tax of $1,854 and $2,008, respectively		3,442			3,729
Less treasury stock, at cost, 37,088 shares		(607	)		(607	)
Total shareholders’ equity		3,301,861			3,244,826
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$	21,606,859		$	21,507,733

See notes to interim consolidated financial statements.

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PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME

(UNAUDITED)

	Three Months Ended March 31,
	2015		2014
	(Dollars in thousands, except per share data)
INTEREST INCOME:
Loans, including fees	$	124,878	$	107,144
Securities		48,562		47,056
Federal funds sold		165		48
Total interest income		173,605		154,248
INTEREST EXPENSE:
Deposits		9,577		9,387
Other borrowings		129		158
Securities sold under repurchase agreements		203		237
Junior subordinated debentures		791		775
Total interest expense		10,700		10,557
NET INTEREST INCOME		162,905		143,691
PROVISION FOR CREDIT LOSSES		1,250		600
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES		161,655		143,091
NONINTEREST INCOME:
Nonsufficient funds (NSF) fees		7,918		8,870
Credit card, debit card and ATM card income		5,638		5,152
Service charges on deposit accounts		4,179		3,609
Trust income		2,009		1,800
Mortgage income		1,148		593
Brokerage income		1,409		1,269
Net gain on sale of assets		1,379		3,310
Other		4,741		4,061
Total noninterest income		28,421		28,664
NONINTEREST EXPENSE:
Salaries and employee benefits		49,966		43,408
Net occupancy and equipment		5,964		5,339
Credit and debit card, data processing and software amortization		3,817		3,184
Regulatory assessments and FDIC insurance		4,354		2,726
Core deposit intangibles amortization		2,489		2,045
Depreciation		2,916		3,201
Communications		2,809		2,737
Other real estate expense		132		396
Other		7,015		8,058
Total noninterest expense		79,462		71,094
INCOME BEFORE INCOME TAXES		110,614		100,661
PROVISION FOR INCOME TAXES		36,973		33,524
NET INCOME	$	73,641	$	67,137
EARNINGS PER SHARE:
Basic	$	1.05	$	1.01
Diluted	$	1.05	$	1.01

See notes to interim consolidated financial statements.

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PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(UNAUDITED)

	Three Months Ended March 31,
	2015			2014
	(Dollars in thousands)
Net income	$	73,641		$	67,137
Other comprehensive loss, before tax:
Securities available for sale:
Change in unrealized gain during period		(442	)		(489	)
Total other comprehensive loss		(442	)		(489	)
Deferred tax benefit related to other comprehensive loss		155			171
Other comprehensive loss, net of tax		(287	)		(318	)
Comprehensive income	$	73,354		$	66,819

See notes to interim consolidated financial statements.

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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, 2013		66,085,179	$	66,085	$	1,798,862		$	917,595		$	4,883		$	(607	)	$	2,786,818
Net income									67,137									67,137
Other comprehensive loss												(318	)					(318	)
Common stock issued in connection with the exercise of stock options and restricted stock awards		212,997		213		1,626												1,839
Stock based compensation expense						1,171												1,171
Cash dividends declared, $0.2400 per share									(15,893	)								(15,893	)
BALANCE AT MARCH 31, 2014		66,298,176	$	66,298	$	1,801,659		$	968,839		$	4,565		$	(607	)	$	2,840,754
BALANCE AT DECEMBER 31, 2014		69,816,653	$	69,817	$	2,025,235		$	1,146,652		$	3,729		$	(607	)	$	3,244,826
Net income									73,641									73,641
Other comprehensive loss												(287	)					(287	)
Common stock issued in connection with the issuance of restricted stock awards		244,225		244		(244	)											-
Stock based compensation expense						2,763												2,763
Cash dividends declared, $0.2725 per share									(19,082	)								(19,082	)
BALANCE AT MARCH 31, 2015		70,060,878	$	70,061	$	2,027,754		$	1,201,211		$	3,442		$	(607	)	$	3,301,861

See notes to interim consolidated financial statements.

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PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

(UNAUDITED)

	Three Months Ended March 31,
	2015			2014
	(Dollars in thousands)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$	73,641		$	67,137
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and core deposit intangibles amortization		5,405			5,246
Provision for credit losses		1,250			600
Net amortization of premium on investments		14,144			12,279
Loss on sale of other real estate		10			60
Gain on sale of assets		(1,379	)		(3,310	)
Net accretion of discount on loans		(19,647	)		(13,476	)
Gain on sale of loans		(1,093	)		(543	)
Proceeds from sale of loans held for sale		45,327			24,241
Originations of loans held for sale		(46,254	)		(25,046	)
Stock based compensation expense		2,763			1,171
Decrease in accrued interest receivable and other assets		30,543			8,840
Increase in accrued interest payable and other liabilities		11,856			35,480
Net cash provided by operating activities		116,566			112,679
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities and principal paydowns of held to maturity securities		392,556			314,135
Purchase of held to maturity securities		(954,084	)		(677,436	)
Proceeds from maturities and principal paydowns of available for sale securities		613,222			263,643
Purchase of available for sale securities		(600,000	)		(250,000	)
Net decrease in loans held for investment		97,616			34,057
Purchase of bank premises and equipment		(2,733	)		(2,478	)
Proceeds from sale of bank premises, equipment and other real estate		5,198			5,041
Net cash used in investing activities		(448,225	)		(313,038	)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in noninterest-bearing deposits		102,016			33,207
Net (decrease) increase in interest-bearing deposits		(233,402	)		135,579
Net proceeds from other short-term borrowings		325,000			30,000
Repayments of other long-term borrowings		(1,810	)		(238	)
Net increase (decrease) in securities sold under repurchase agreements		2,895			(15,283	)
Redemption of junior subordinated debentures		(167,531	)		-
Proceeds from stock option exercises		-			1,839
Payments of cash dividends		(19,082	)		(15,893	)
Net cash provided by financing activities		8,086			169,211
NET DECREASE IN CASH AND CASH EQUIVALENTS		(323,573	)		(31,148	)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD		677,854			381,390
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	354,281		$	350,242
NONCASH ACTIVITIES:
Acquisition of real estate through foreclosure of collateral	$	766		$	2,710
SUPPLEMENTAL INFORMATION:
Income taxes paid	$	2,000		$	5,000
Interest paid		11,665			10,694

See notes to interim consolidated financial statements.

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PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(UNAUDITED)

1. BASIS OF PRESENTATION

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

The accompanying unaudited interim consolidated financial statements have been prepared in accordance with generally accepted accounting principles for interim 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 generally accepted accounting principles 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, 2014. Operating results for the three-month period ended March 31, 2015 are not necessarily indicative of the results that may be expected for the year ending December 31, 2015 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 March 31,
	2015				2014
			Per Share				Per Share
	Amount		Amount		Amount		Amount
	(Amounts in thousands, except per share data)
Net income	$	73,641			$	67,137
Basic:
Weighted average shares outstanding		70,034	$	1.05		66,186	$	1.01
Diluted:
Add incremental shares for:
Effect of dilutive securities - options		21				94
Total		70,055	$	1.05		66,280	$	1.01

There were no stock options exercisable during the three months ended March 31, 2015 or 2014 that would have had an anti-dilutive effect on the above computation.

3. NEW ACCOUNTING STANDARDS

Accounting Standards Updates (“ASU”)

ASU 2015-01, “Income Statement - Extraordinary and Unusual Items (Subtopic 225-20) – Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items.” ASU 2015-01 eliminates from U.S. GAAP the concept of extraordinary items, which, among other things, required an entity to segregate extraordinary items considered to be unusual and infrequent from the results of ordinary operations and show the item separately in the income statement, net of tax, after income from continuing operations. ASU 2015-01 is effective for the Company beginning January 1, 2016, though early adoption is permitted. ASU 2015-01 is not expected to have a significant impact on the Company’s financial statements.

ASU 2014-12 “Compensation-Stock Compensation (Topic 718) - Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period.”  ASU 2014-12 requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. The performance target should not be reflected in estimating the grant-date fair value of the award. Compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the period(s) for which the requisite service has already been rendered. If the performance target becomes probable of being achieved before the end of the requisite service period, the remaining unrecognized compensation cost should be recognized prospectively over the remaining requisite service period. The total amount of compensation cost recognized during and after the requisite service period should reflect the number of awards that are expected to vest and should be adjusted to reflect those awards that ultimately vest. The requisite service period ends when the employee can cease rendering service and still be eligible to vest in the award if the performance target is achieved. ASU 2014-12 is effective for the Company beginning January 1, 2016 and is not expected to have a significant impact on the Company’s financial statements. 

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PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(UNAUDITED)

ASU 2014-11 “Transfers and Servicing (Topic 860) - Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosure.”  ASU 2014-11 changes the accounting for repurchase-to-maturity transactions to secured borrowing accounting. It also requires separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting and disclosure for the repurchase agreement. ASU 2014-11 became effective for the Company on January 1, 2015 and did not have a significant impact on the Company’s financial statements. 

ASU 2014-09 “Revenue from Contract 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.  Additionally, ASU 2014-09  supersedes some cost guidance included in Revenue Recognition—Construction-Type and Production-Type Contracts (Subtopic 605-35).  In addition, the existing requirements for the recognition of a gain or loss on the transfer of nonfinancial assets that are not in a contract with a customer are amended to be consistent with the guidance on recognition and measurement.   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.  ASU 2014-09 is effective for the Company beginning January 1, 2018, with retrospective application to each prior reporting period presented, and the Company is currently evaluating the requirements and it is not expected to have a significant impact on the Company’s financial statements. 

ASU 2014-04 “Receivables—Troubled Debt Restructurings by Creditors (Subtopic 310-40) — Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure.” ASU 2014-04 intends to reduce diversity by clarifying when an in substance repossession or foreclosure occurs, that is, when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan receivable should be derecognized and the real estate property recognized. ASU 2014-04 became effective for the Company on January 1, 2015 and did not have a significant impact on the Company’s financial statements.

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PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(UNAUDITED)

4. SECURITIES

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

	March 31, 2015
			Gross		Gross
	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value
	(Dollars in thousands)
Available for Sale
States and political subdivisions	$	9,205	$	99	$	-		$	9,304
Collateralized mortgage obligations		31,792		99		(14	)		31,877
Mortgage-backed securities		72,864		4,846		(13	)		77,697
Other securities		12,589		304		(26	)		12,867
Total	$	126,450	$	5,348	$	(53	)	$	131,745
Held to Maturity
U.S. Treasury securities and obligations of U.S. Government agencies	$	52,393	$	926	$	-		$	53,319
States and political subdivisions		376,080		6,498		(1,352	)		381,226
Collateralized mortgage obligations		13,826		124		(3	)		13,947
Mortgage-backed securities		9,005,452		125,414		(43,255	)		9,087,611
Total	$	9,447,751	$	132,962	$	(44,610	)	$	9,536,103

	December 31, 2014
			Gross		Gross
	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value
	(Dollars in thousands)
Available for Sale
States and political subdivisions	$	14,402	$	183	$	-		$	14,585
Collateralized mortgage obligations		33,519		91		(37	)		33,573
Mortgage-backed securities		79,153		5,344		(14	)		84,483
Other securities		12,588		201		(31	)		12,758
Total	$	139,662	$	5,819	$	(82	)	$	145,399
Held to Maturity
U.S. Treasury securities and obligations of U.S. Government agencies	$	52,353	$	360	$	(74	)	$	52,639
States and political subdivisions		404,356		6,147		(1,422	)		409,081
Collateralized mortgage obligations		19,585		215		(8	)		19,792
Mortgage-backed securities		8,424,083		96,650		(53,553	)		8,467,180
Total	$	8,900,377	$	103,372	$	(55,057	)	$	8,948,692

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PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(UNAUDITED)

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.”

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.

When OTTI occurs, the amount of the other-than-temporary impairment 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 shall 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 shall 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 shall become the new amortized cost basis of the investment.

As of March 31, 2015, management does not have the intent to sell any of its securities and believes that it is more likely than not that the Company will not have to sell any such 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 March 31, 2015, management believes any impairment in the Company’s securities is temporary and no impairment loss has been realized in the Company’s consolidated statements of income.

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PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(UNAUDITED)

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

	March 31, 2015
	Less than 12 Months					More than 12 Months					Total
	Estimated		Unrealized			Estimated		Unrealized			Estimated		Unrealized
	Fair Value		Losses			Fair Value		Losses			Fair Value		Losses
	(Dollars in thousands)
Available for Sale
Collateralized mortgage obligations	$	-	$	-		$	5,709	$	(14	)	$	5,709	$	(14	)
Mortgage-backed securities		317		-			2,716		(13	)		3,033		(13	)
Other securities		1,711		(26	)		-		-			1,711		(26	)
Total	$	2,028	$	(26	)	$	8,425	$	(27	)	$	10,453	$	(53	)
Held to Maturity
U.S. Treasury securities and obligations of U.S. Government agencies	$	-	$	-		$	-	$	-		$	-	$	-
States and political subdivisions		43,909		(262	)		48,509		(1,090	)		92,418		(1,352	)
Collateralized mortgage obligations		1,103		-			309		(3	)		1,412		(3	)
Mortgage-backed securities		759,408		(8,364	)		2,160,554		(34,891	)		2,919,962		(43,255	)
Total	$	804,420	$	(8,626	)	$	2,209,372	$	(35,984	)	$	3,013,792	$	(44,610	)

	December 31, 2014
	Less than 12 Months					More than 12 Months					Total
	Estimated		Unrealized			Estimated		Unrealized			Estimated		Unrealized
	Fair Value		Losses			Fair Value		Losses			Fair Value		Losses
	(Dollars in thousands)
Available for Sale
Collateralized mortgage obligations	$	6,675	$	(36	)	$	45	$	(1	)	$	6,720	$	(37	)
Mortgage-backed securities		358		-			2,837		(14	)		3,195		(14	)
Other securities		1,706		(31	)		-		-			1,706		(31	)
Total	$	8,739	$	(67	)	$	2,882	$	(15	)	$	11,621	$	(82	)
Held to Maturity
U.S. Treasury securities and obligations of U.S. Government agencies	$	17,098	$	(74	)	$	-	$	-		$	17,098	$	(74	)
States and political subdivisions		45,680		(425	)		44,760		(997	)		90,440		(1,422	)
Collateralized mortgage obligations		670		(5	)		322		(3	)		992		(8	)
Mortgage-backed securities		1,149,380		(2,600	)		2,349,143		(50,953	)		3,498,523		(53,553	)
Total	$	1,212,828	$	(3,104	)	$	2,394,225	$	(51,953	)	$	3,607,053	$	(55,057	)

At March 31, 2015 and December 31, 2014, there were 498 securities and 501 securities, respectively, in an unrealized loss position for more than 12 months.

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PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(UNAUDITED)

The amortized cost and fair value of investment securities at March 31, 2015, 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		Fair			Amortized	Fair
	Cost		Value			Cost	Value
	(Dollars in thousands)
Due in one year or less	$	35,021	$	35,145	$	12,689	$	12,969
Due after one year through five years		176,412		178,087		4,616		4,658
Due after five years through ten years		163,600		167,669		3,859		3,907
Due after ten years		53,440		53,644		630		637
Subtotal		428,473		434,545		21,794		22,171
Mortgage-backed securities and collateralized mortgage obligations		9,019,278		9,101,558		104,656		109,574
Total	$	9,447,751	$	9,536,103	$	126,450	$	131,745

The Company recorded no gain or loss on sale of securities for the three months ended March 31, 2015 and 2014. As of March 31, 2015, the Company did not own any non-agency collateralized mortgage obligations.

At March 31, 2015 and December 31, 2014, 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 $4.99 billion and $5.08 billion and a fair value of $5.04 billion and $5.10 billion at March 31, 2015 and December 31, 2014, respectively, were pledged to collateralize public deposits and for other purposes required or permitted by law.

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(UNAUDITED)

5. LOANS AND ALLOWANCE FOR CREDIT LOSSES

The loan portfolio consists of various types of loans made principally to borrowers located within the states of Texas and Oklahoma and is categorized by major type as follows:

	March 31,		December 31,
	2015		2014
	(Dollars in thousands)
Residential mortgage loans held for sale	$	10,622	$	8,602
Commercial and industrial		1,723,121		1,806,267
Real estate:
Construction, land development and other land loans		1,040,845		1,026,475
1-4 family residential (including home equity)		2,532,060		2,513,579
Commercial real estate (including multi-family residential)		3,021,656		3,030,340
Farmland		380,303		361,943
Agriculture		176,536		189,703
Consumer and other		280,862		307,274
Total loans held for investment		9,155,383		9,235,581
Total	$	9,166,005	$	9,244,183

(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 thorough underwriting and more active servicing than other types of loans.

(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 March 31, 2015, approximately 48.9% of the outstanding principal balance of the Company’s commercial real estate loans were secured by owner-occupied properties.

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(UNAUDITED)

(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, there is no assurance that the Company will 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. While the Company has underwriting procedures designed to identify what it believes to be acceptable levels of risks in construction lending, no assurance can be given that these procedures will prevent losses from the risks described above.

(v) Agriculture Loans. The Company provides agriculture loans for short-term 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.

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(UNAUDITED)

Concentrations of Credit. Most of the Company’s lending activity occurs within the states of Texas and Oklahoma. The majority of the Company’s loan portfolio consists of commercial real estate, 1-4 family residential loans, and commercial and industrial loans. As of March 31, 2015 and December 31, 2014, 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 was not significant at March 31, 2015 or December 31, 2014.

Related Party Loans. As of March 31, 2015 and December 31, 2014, loans outstanding to directors, officers and their affiliates totaled $5.0 million and $4.9 million, respectively. All transactions entered into between the Company and such related parties are done 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:

	March 31,			December 31,
	2015			2014
	(Dollars in thousands)
Beginning balance on January 1	$	4,940		$	6,187
New loans and reclassified related loans		174			4,943
Repayments		(76	)		(6,190	)
Ending balance	$	5,038		$	4,940

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 and the Company also monitors its delinquency levels for any negative or adverse trends. There can be no assurance, however, that the Company’s loan portfolio will not 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.

The Company requires appraisals on loans collateralized by real estate. 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.

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015 

(UNAUDITED)

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

	March 31, 2015
	Loans Past Due and Still Accruing
			90 or More		Total Past		Nonaccrual		Current		Total
	30-89 Days		Days		Due Loans		Loans		Loans		Loans
	(Dollars in thousands)
Construction, land development and other land loans other land loans	$	6,239	$	2,128	$	8,367	$	651	$	1,031,827	$	1,040,845
Agriculture and agriculture real estate (includes farmland)		1,811		-		1,811		280		554,748		556,839
1-4 family (includes home equity) (1)		3,607		38		3,645		3,003		2,536,034		2,542,682
Commercial real estate (includes multi-family residential)		10,839		671		11,510		8,373		3,001,773		3,021,656
Commercial and industrial		16,931		131		17,062		16,566		1,689,493		1,723,121
Consumer and other		1,523		-		1,523		379		278,960		280,862
Total	$	40,950	$	2,968	$	43,918	$	29,252	$	9,092,835	$	9,166,005

	December 31, 2014
	Loans Past Due and Still Accruing
			90 or More		Total Past		Nonaccrual		Current		Total
	30-89 Days		Days		Due Loans		Loans		Loans		Loans
	(Dollars in thousands)
Construction, land development and other land loans	$	7,667	$	-	$	7,667	$	526	$	1,018,282	$	1,026,475
Agriculture and agriculture real estate (includes farmland)		2,995		377		3,372		96		548,178		551,646
1-4 family (includes home equity) (1)		2,261		82		2,343		3,570		2,516,268		2,522,181
Commercial real estate (includes multi-family residential)		12,679		65		12,744		6,340		3,011,256		3,030,340
Commercial and industrial		18,305		869		19,174		20,537		1,766,556		1,806,267
Consumer and other		612		800		1,412		353		305,509		307,274
Total	$	44,519	$	2,193	$	46,712	$	31,422	$	9,166,049	$	9,244,183

(1) Includes $10.6 million and $8.6 million of residential mortgage loans held for sale at March 31, 2015 and December 31, 2014, respectively.

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(UNAUDITED)

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

	March 31,			December 31,
	2015			2014
	(Dollars in thousands)
Nonaccrual loans (1)	$	29,252		$	31,422
Accruing loans 90 or more days past due		2,968			2,193
Total nonperforming loans		32,220			33,615
Repossessed assets		146			67
Other real estate		3,010			3,237
Total nonperforming assets	$	35,376		$	36,919
Nonperforming assets to total loans and other real estate		0.39	%		0.40	%

________________

(1) Includes troubled debt restructurings of $766 thousand and $911 thousand as of March 31, 2015 and December 31, 2014, respectively.

The Company had $35.4 million in nonperforming assets at March 31, 2015 compared with $36.9 million at December 31, 2014, of which $30.6 million and $30.7 million were originated by acquired banks, respectively. These results are reflective of the Company’s conservative lending approach.

If interest on nonaccrual loans had been accrued under the original loan terms, approximately $910 thousand and $234 thousand would have been recorded as income for the three months ended March 31, 2015 and 2014, 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 acquisitions completed during 2014 or 2013). 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 March 31, 2015 and December 31, 2014, including accrued but unpaid interest and any amounts previously charged off.

	March 31,		December 31,
	2015		2014
	(Dollars in thousands)
PCI loans:
Outstanding balance	$	100,973	$	129,412
Less: discount		51,647		72,270
Recorded investment	$	49,326	$	57,142

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(UNAUDITED)

Changes in the accretable yield for acquired PCI loans as of the three months ended March 31, 2015 and 2014 were as follows:

	Three Months Ended March 31,
	2015			2014
	(Dollars in thousands)
Balance at beginning of period	$	9,867		$	7,569
Additions		-			-
Reclassifications from nonaccretable		7,291			1,503
Accretion		(9,288	)		(2,888	)
Balance at March 31	$	7,870		$	6,184

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 March 31, 2015 and 2014, including accrued but unpaid interest and any amounts previously charged off.

	March 31,		December 31,
	2015		2014
	(Dollars in thousands)
Non-PCI loans:
Outstanding balance	$	1,939,609	$	2,186,111
Less: discount		78,289		89,105
Recorded investment	$	1,861,320	$	2,097,006

Changes in the discount accretion for Non-PCI loans for the three months ended March 31, 2015 and 2014 were as follows:

	Three Months Ended March 31,
	2015			2014
	(Dollars in thousands)
Balance at beginning of period	$	89,105		$	87,798
Accretion charge-offs		(457	)		(48	)
Accretion		(10,359	)		(10,587	)
Balance at March 31	$	78,289		$	77,163

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.

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PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(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.

	March 31, 2015
			Unpaid				Average
	Recorded		Principal		Related		Recorded
	Investment		Balance		Allowance		Investment
	(Dollars in thousands)
With no related allowance recorded:
Construction, land development and other land loans	$	245	$	251	$	-	$	251
Agriculture and agriculture real estate (includes farmland)		190		190		-		95
1-4 family (includes home equity)		1,415		1,532		-		1,621
Commercial real estate (includes multi-family residential)		5,392		5,426		-		5,260
Commercial and industrial		4,003		4,194		-		6,839
Consumer and other		141		161		-		4,152
Total		11,386		11,754		-		18,218
With an allowance recorded:
Construction, land development and other land loans		276		276		221		276
Agriculture and agriculture real estate (includes farmland)		42		52		21		49
1-4 family (includes home equity)		1,188		1,254		242		1,340
Commercial real estate (includes multi-family residential)		798		2,394		507		1,228
Commercial and industrial		7,016		7,171		2,396		4,813
Consumer and other		225		243		93		238
Total		9,545		11,390		3,480		7,944
Total:
Construction, land development and other land loans		521		527		221		527
Agriculture and agriculture real estate (includes farmland)		232		242		21		144
1-4 family (includes home equity)		2,603		2,786		242		2,961
Commercial real estate (includes multi-family residential)		6,190		7,820		507		6,488
Commercial and industrial		11,019		11,365		2,396		11,652
Consumer and other		366		404		93		4,390
	$	20,931	$	23,144	$	3,480	$	26,162

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(UNAUDITED)

	December 31, 2014
			Unpaid				Average
	Recorded		Principal		Related		Recorded
	Investment		Balance		Allowance		Investment
	(Dollars in thousands)
With no related allowance recorded:
Construction, land development and other land loans	$	250	$	256	$	-	$	264
Agriculture and agriculture real estate (includes farmland)		-		-		-		7
1-4 family (includes home equity)		1,710		1,831		-		1,147
Commercial real estate (includes multi-family residential)		5,093		5,126		-		3,792
Commercial and industrial		9,485		9,678		-		4,794
Consumer and other		8,144		8,161		-		4,080
Total		24,682		25,052		-		14,084
With an allowance recorded:
Construction, land development and other land loans		276		276		225		138
Agriculture and agriculture real estate (includes farmland)		46		55		24		34
1-4 family (includes home equity)		1,426		1,473		418		1,973
Commercial real estate (includes multi-family residential)		62		63		24		838
Commercial and industrial		2,454		4,182		1,597		1,783
Consumer and other		234		251		205		164
Total		4,498		6,300		2,493		4,930
Total:
Construction, land development and other land loans		526		532		225		402
Agriculture and agriculture real estate (includes farmland)		46		55		24		41
1-4 family (includes home equity)		3,136		3,304		418		3,120
Commercial real estate (includes multi-family residential)		5,155		5,189		24		4,630
Commercial and industrial		11,939		13,860		1,597		6,577
Consumer and other		8,378		8,412		205		4,244
	$	29,180	$	31,352	$	2,493	$	19,014

Credit Quality Indicators. As part of the ongoing 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.

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MARCH 31, 2015

(UNAUDITED)

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 credit 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.

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 March 31, 2015. Impaired loans include loans in risk grades 7, 8 and 9.

	Construction,		Agriculture and				Commercial
	Land		Agriculture				Real Estate
	Development and		Real Estate		1-4 Family (includes		(includes Multi-		Commercial
	Other Land Loans		(includes Farmland)		Home Equity)(1)		Family Residential)		and Industrial		Consumer and Other		Total
	(Dollars in thousands)
Grade 1	$	-	$	6,525	$	-	$	-	$	57,718	$	42,502	$	106,745
Grade 2		19,526		5,630		26,790		26,052		24,696		36,338		139,032
Grade 3		992,318		509,825		2,467,982		2,814,735		1,438,160		190,968		8,413,988
Grade 4		24,698		14,126		30,536		107,547		111,401		2,894		291,202
Grade 5		486		6,367		1,097		11,914		47,162		16		67,042
Grade 6		2,024		13,630		7,830		32,534		13,943		7,778		77,739
Grade 7		521		232		2,603		6,190		10,930		366		20,842
Grade 8		-		-		-		-		89		-		89
Grade 9		-		-		-		-		-		-		-
PCI Loans (2)		1,272		504		5,844		22,684		19,022		-		49,326
Total	$	1,040,845	$	556,839	$	2,542,682	$	3,021,656	$	1,723,121	$	280,862	$	9,166,005

(1) Includes $10.6 million of residential mortgage loans held for sale at March 31, 2015.

(2) Of the total PCI loans, $28.2 million were classifed as substandard at March 31, 2015.

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(UNAUDITED)

The following table presents risk grades and PCI loans by category of loan at December 31, 2014. Impaired loans include loans in risk grades 7, 8 and 9.

	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	$	-	$	13,507	$	-	$	-	$	61,697	$	41,240	$	116,444
Grade 2		-		-		-		-		-		-		-
Grade 3		1,022,002		528,400		2,503,679		2,965,455		1,698,558		257,588		8,975,682
Grade 4		-		-		-		-		-		-		-
Grade 5		497		4,265		1,174		10,424		3,266		18		19,644
Grade 6		2,308		4,921		8,266		25,839		4,707		50		46,091
Grade 7		526		46		3,136		5,155		11,834		8,378		29,075
Grade 8		-		-		-		-		105		-		105
Grade 9		-		-		-		-		-		-		-
PCI Loans (2)		1,142		507		5,926		23,467		26,100		-		57,142
Total	$	1,026,475	$	551,646	$	2,522,181	$	3,030,340	$	1,806,267	$	307,274	$	9,244,183

(1) Includes $8.6 million of residential mortgage loans held for sale at December 31, 2014.

(2) Of the total PCI loans, $32.0 million were classifed as substandard at December 31, 2014.

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 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: 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 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.

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015 

(UNAUDITED)

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;

• 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 agricultural 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 agricultural 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 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 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.

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.

At March 31, 2015, the allowance for credit losses totaled $81.0 million or 0.88% of total loans, including acquired loans with discounts. At December 31, 2014, the allowance totaled $80.8 million or 0.87% of total loans, including loans with discounts.

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015 

(UNAUDITED)

The following table details activity in the allowance for loan losses by category of loan for the three months ended March 31, 2015 and 2014. 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 January 1, 2015	$	15,825		$	3,722		$	16,377		$	12,744		$	30,002		$	2,092		$	80,762
Provision for credit losses		1,178			(523	)		487			(173	)		586			(305	)		1,250
Charge-offs		(151	)		-			(98	)		(43	)		(728	)		(729	)		(1,749	)
Recoveries		6			78			12			10			224			370			700
Net charge-offs		(145	)		78			(86	)		(33	)		(504	)		(359	)		(1,049	)
Balance March 31, 2015	$	16,858		$	3,277		$	16,778		$	12,538		$	30,084		$	1,428		$	80,963
Allowance for credit losses:
Three Months Ended
Balance January 1, 2014	$	14,353		$	1,229		$	17,046		$	24,835		$	8,167		$	1,652		$	67,282
Provision for credit losses		(770	)		46			1,804			(1,404	)		567			357			600
Charge-offs		(2	)		(14	)		(139	)		(102	)		(143	)		(1,045	)		(1,445	)
Recoveries		19			95			7			42			62			434			659
Net charge-offs		17			81			(132	)		(60	)		(81	)		(611	)		(786	)
Balance March 31, 2014	$	13,600		$	1,356		$	18,718		$	23,371		$	8,653		$	1,398		$	67,096

The following table details the amount of the allowance for loan losses allocated to each category of loan as of March 31, 2015, December 31, 2014 and March 31, 2014, detailed 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:
March 31, 2015
Individually evaluated for impairment	$	221	$	21	$	242	$	507	$	2,396	$	93	$	3,480
Collectively evaluated for impairment		16,637		3,256		16,536		12,031		26,276		1,335		76,071
PCI loans		-		-		-		-		1,412		-		1,412
Total allowance for credit losses	$	16,858	$	3,277	$	16,778	$	12,538	$	30,084	$	1,428	$	80,963
December 31, 2014
Individually evaluated for impairment	$	225	$	24	$	418	$	24	$	1,597	$	205	$	2,493
Collectively evaluated for impairment		15,600		3,698		15,959		12,720		28,405		1,887		78,269
PCI loans		-		-		-		-		-		-		-
Total allowance for credit losses	$	15,825	$	3,722	$	16,377	$	12,744	$	30,002	$	2,092	$	80,762
March 31, 2014
Individually evaluated for impairment	$	-	$	48	$	767	$	7	$	1,217	$	92	$	2,131
Collectively evaluated for impairment		13,600		1,308		17,951		23,364		7,436		1,306		64,965
PCI loans		-		-		-		-		-		-		-
Total allowance for credit losses	$	13,600	$	1,356	$	18,718	$	23,371	$	8,653	$	1,398	$	67,096

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PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(UNAUDITED)

The following table details the recorded investment in loans as of March 31, 2015, December 31, 2014 and March 31, 2014, excluding $10.6 million, $8.6 million and $3.6 million, respectively, of residential mortgage loans held for sale, related to each balance in the allowance for loan losses by category of loan.

			Agriculture
	Construction,		and				Commercial
	Land		Agriculture		1-4 Family		Real Estate
	Development		Real Estate		(includes		(includes		Commercial
	and Other		(includes		Home		Multi-Family		and		Consumer
	Land Loans		Farmland)		Equity)		Residential)		Industrial		and Other		Total
	(Dollars in thousands)
Recorded investment in loans:
March 31, 2015
Individually evaluated for impairment	$	521	$	232	$	2,603	$	6,190	$	11,019	$	366	$	20,931
Collectively evaluated for impairment		1,039,052		556,103		2,523,613		2,992,782		1,693,080		280,496		9,085,126
PCI loans		1,272		504		5,844		22,684		19,022		-		49,326
Total loans evaluated for impairment	$	1,040,845	$	556,839	$	2,532,060	$	3,021,656	$	1,723,121	$	280,862	$	9,155,383
December 31, 2014
Individually evaluated for impairment	$	526	$	46	$	3,136	$	5,155	$	11,939	$	8,378	$	29,180
Collectively evaluated for impairment		1,024,807		551,093		2,504,517		3,001,718		1,768,228		298,896		9,149,259
PCI loans		1,142		507		5,926		23,467		26,100		-		57,142
Total loans evaluated for impairment	$	1,026,475	$	551,646	$	2,513,579	$	3,030,340	$	1,806,267	$	307,274	$	9,235,581
March 31, 2014
Individually evaluated for impairment	$	324	$	207	$	2,949	$	1,422	$	1,562	$	149	$	6,613
Collectively evaluated for impairment		885,267		512,058		2,159,996		2,681,641		1,248,064		215,557		7,702,583
PCI loans		3,394		592		3,943		26,323		5,394		-		39,646
Total loans evaluated for impairment	$	888,985	$	512,857	$	2,166,888	$	2,709,386	$	1,255,020	$	215,706	$	7,748,842

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PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(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. Per ASU No. 2011-02, “Receivables (Topic 310)-A Creditor’s Determination of Whether a Restructuring Is a Troubled Debt Restructuring” the Company reassesses all loan modifications to identify whether the restructuring constitutes as troubled debt restructurings. The following table presents information regarding the recorded investment of loans modified in a troubled debt restructuring during the three months ended March 31, 2015 and 2014:

	Three Months Ended March 31,
	2015						2014
			Pre-		Post-				Pre-		Post-
			Modification		Modification				Modification		Modification
			Outstanding		Outstanding				Outstanding		Outstanding
	Number of		Recorded		Recorded		Number of		Recorded		Recorded
	Loans		Investment		Investment		Loans		Investment		Investment
	(Dollars in thousands)
Troubled Debt Restructurings
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)		-		-		-		1		35		35
Commercial and industrial		-		-		-		1		16		16
Consumer and other		1		10		10		-		-		-
Total		1	$	10	$	10		2	$	51	$	51

As of March 31, 2015, there have been no defaults on any loans that were modified as troubled debt restructurings during the preceding three months. Default is determined at 90 or more days past due. The modifications primarily 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 March 31, 2015 and 2014, the Company had $766 thousand and $1.4 million, respectively, in outstanding troubled debt restructurings. For the three months ended March 31, 2015, the Company added 1 loan totaling $10 thousand as a new troubled debt restructuring, of which $10 thousand was still outstanding at March 31, 2015. These modifications did not have a material impact on the Company’s determination of the allowance for credit losses.

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 at fair value other assets 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:

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PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(UNAUDITED) 

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 future expected loss experience, 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 March 31, 2015
	Level 1		Level 2			Level 3		Total
	(Dollars in thousands)
Assets:
Available for sale securities:
States and political subdivisions	$	-	$	9,304		$	-	$	9,304
Collateralized mortgage obligations		-		31,877			-		31,877
Mortgage-backed securities		-		77,697			-		77,697
Other securities		12,867		-			-		12,867
Total	$	12,867	$	118,878		$	-	$	131,745
Non-hedging interest rate swap	$	-	$	450		$	-	$	450
Liabilities:
Non-hedging interest rate swap	$	-	$	(450	)	$	-	$	(450	)

	As of December 31, 2014
	Level 1		Level 2			Level 3		Total
	(Dollars in thousands)
Assets:
Available for sale securities:
States and political subdivisions	$	-	$	14,585		$	-	$	14,585
Collateralized mortgage obligations		-		33,573			-		33,573
Mortgage-backed securities		-		84,483			-		84,483
Other securities		12,758		-			-		12,758
Total	$	12,758	$	132,641		$	-	$	145,399
Non-hedging interest rate swap	$	-	$	303		$	-	$	303
Liabilities:
Non-hedging interest rate swap	$	-	$	(303	)	$	-	$	(303	)

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PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(UNAUDITED)

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, held to maturity debt securities, loans held for sale, and impaired loans. For the three months ended March 31, 2015, the Company had additions to other real estate owned of $983 thousand of which $733 thousand were outstanding as of March 31, 2015. For the three months ended March 31, 2015, the Company had additions to impaired loans of $1.5 million, of which $1.5 million were still outstanding as of March 31, 2015. The remaining assets and liabilities measured at fair value on a nonrecurring basis that were recorded in 2015 and remained outstanding at March 31, 2015 were not significant.

The following table presents carrying and fair value information of financial instruments as of the dates indicated:

	As of March 31, 2015
	Carrying		Estimated Fair Value
	Amount		Level 1		Level 2		Level 3		Total
	(Dollars in thousands)
Assets
Cash and due from banks	$	352,642	$	352,642	$	-	$	-	$	352,642
Federal funds sold		1,639		1,639		-		-		1,639
Held to maturity securities		9,447,751		-		9,536,103		-		9,536,103
Loans held for sale		10,622		-		10,622		-		10,622
Loans held for investment, net of allowance		9,074,420		-		-		9,154,675		9,154,675
Other real estate owned		3,010		-		3,010		-		3,010
Liabilities
Deposits:
Noninterest-bearing	$	5,038,436	$	-	$	5,038,436	$	-	$	5,038,436
Interest-bearing		12,522,916		-		12,531,588		-		12,531,588
Other borrowings		331,914		-		332,804		-		332,804
Securities sold under repurchase agreements		318,418		-		318,434		-		318,434
Junior subordinated debentures		-		-		-		-		-

	As of December 31, 2014
	Carrying		Estimated Fair Value
	Amount		Level 1		Level 2		Level 3		Total
	(Dollars in thousands)
Assets
Cash and due from banks	$	677,285	$	677,285	$	-	$	-	$	677,285
Federal funds sold		569		569		-		-		569
Held to maturity securities		8,900,377		-		8,948,692		-		8,948,692
Loans held for sale		8,602		-		8,602		-		8,602
Loans held for investment, net of allowance		9,154,819		-		-		9,192,231		9,192,231
Other real estate owned		3,237		-		3,237		-		3,237
Liabilities
Deposits:
Noninterest-bearing	$	4,936,420	$	-	$	4,936,420	$	-	$	4,936,420
Interest-bearing		12,756,738		-		12,767,961		-		12,767,961
Other borrowings		8,724		-		10,000		-		10,000
Securities sold under repurchase agreements		315,523		-		315,543		-		315,543
Junior subordinated debentures		167,531		-		159,740		-		159,740

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PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(UNAUDITED)

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.

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.

Junior subordinated debentures—The fair value of the junior subordinated debentures was calculated using the quoted market prices, if available. If quoted market prices are not available, fair value is estimated using quoted market prices for similar subordinated debentures. Junior subordinated debentures 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.

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PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(UNAUDITED)

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.

Derivative financial instruments—The fair value of the underlying non-hedging derivative contracts offset each other 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 March 31, 2015. 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 (“CDI”) for the three months ended March 31, 2015 and the year ended December 31, 2014 were as follows:

			Core Deposit
	Goodwill		Intangibles
	(Dollars in thousands)
Balance as of December 31, 2013	$	1,671,520	$	42,049
Less:
Amortization		-		(9,940	)
Add:
Measurement period adjustments		4,426		(302	)
Acquisition of F&M Bancorporation Inc.		198,245		27,140
Balance as of December 31, 2014		1,874,191		58,947
Less:
Amortization		-		(2,489	)
Add:
Measurement period adjustments		7,764		-
Balance as of March 31, 2015	$	1,881,955	$	56,458

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 reflected in the table above 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 other intangibles has occurred. If any such impairment is determined, a write-down is recorded. As of March 31, 2015, there were no impairments recorded on goodwill and other intangibles.

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PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(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 $2.5 million and $2.0 million for the three months ended March 31, 2015 and 2014, respectively. The estimated aggregate future amortization expense for CDI remaining as of March 31, 2015 is as follows (dollars in thousands):

Remaining 2015	$	7,041
2016		8,519
2017		6,327
2018		5,400
2019		4,546
Thereafter		24,625
Total	$	56,458

8. STOCK BASED COMPENSATION 

At March 31, 2015, the Company had three stock-based employee compensation plans. Two of the three plans adopted by the Company have expired and therefore no additional awards may be issued under those plans.

During 1998, the Company’s Board of Directors and shareholders approved the Prosperity Bancshares, Inc. 1998 Stock Incentive Plan (the “1998 Plan”) which authorized the issuance of up to 920,000 (after two-for-one stock split) shares of the common stock of Bancshares under both non-qualified and incentive stock options to employees and non-qualified stock options to directors who are not employees. The 1998 Plan also provided for the granting of restricted stock awards, stock appreciation rights, phantom stock awards and performance awards on substantially similar terms. The 1998 Plan has expired and therefore no additional options may be issued from the 1998 Plan.

During 2004, the Company’s Board of Directors adopted the Prosperity Bancshares, Inc. 2004 Stock Incentive Plan (the “2004 Plan”) which was approved by the Company's 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 the granting of incentive and nonqualified stock options to employees and nonqualified stock options to directors who were not employees. The 2004 Plan also provided for the granting 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 from the 2004 Plan.

During 2012, the Company’s Board of Directors and shareholders adopted the Prosperity Bancshares, Inc. 2012 Stock Incentive Plan (the “2012 Plan”), which authorizes 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 284,043 shares have been granted under the 2012 Plan as of March 31, 2015.  

The Company received no cash from the exercise of stock options for the three month period ended March 31, 2015 and $1.8 million in cash for the three month period ended March 31, 2014. There was no tax benefit realized from option exercises of the share-based payment arrangements during the three month periods ended March 31, 2015 and 2014.

As of March 31, 2015, there was $28.4 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 2.05 years.

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PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(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 March 31, 2015 (other than deposit obligations and securities sold under repurchase agreements). The Company’s future cash payments associated with its contractual obligations pursuant to its FHLB borrowings and operating leases as of March 31, 2015 are summarized below. Payments for FHLB borrowings include interest of $1.3 million that will be paid over the future periods. Payments related to leases are based on actual payments specified in underlying contracts.

			More than 1		3 years or
			year but less		more but less		5 years
	1 year or less		than 3 years		than 5 years		or more		Total
	(Dollars in thousands)
Federal Home Loan Bank notes payable	$	326,062	$	1,803	$	4,648	$	722	$	333,235
Operating leases		6,633		9,066		4,205		7,693		27,597
Total	$	332,695	$	10,869	$	8,853	$	8,415	$	360,832

Off-Balance Sheet Items

In the normal course of business, the Company enters into various transactions, which, in accordance with accounting principles generally accepted in the United States, 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 periods as of March 31, 2015 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.

			More than 1		3 years or
			year but less		more but less		5 years
	1 year or less		than 3 years		than 5 years		or more		Total
	(Dollars in thousands)
Standby letters of credit	$	80,087	$	17,273	$	1,086	$	-	$	98,446
Commitments to extend credit		867,449		601,245		56,277		390,714		1,915,685
Total	$	947,536	$	618,518	$	57,363	$	390,714	$	2,014,131

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PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(UNAUDITED)

10. OTHER COMPREHENSIVE (LOSS) INCOME

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

	Three Months Ended March 31,
	2015								2014
	Before Tax Amount			Tax Benefit		Net of Tax Amount			Before Tax Amount			Tax Benefit		Net of Tax Amount
	(Dollars in thousands)
Other comprehensive loss:
Securities available for sale:
Change in unrealized gain uring period	$	(442	)	$	155	$	(287	)	$	(489	)	$	171	$	(318	)
Total securities available for sale		(442	)		155		(287	)		(489	)		171		(318	)
Total other comprehensive loss	$	(442	)	$	155	$	(287	)	$	(489	)	$	171	$	(318	)

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, 2015	$	3,729		$	3,729
Other comprehensive loss		(287	)		(287	)
Balance at March 31, 2015	$	3,442		$	3,442
Balance at January 1, 2014	$	4,883		$	4,883
Other comprehensive loss		(318	)		(318	)
Balance at March 31, 2014	$	4,565		$	4,565

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PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2015

(UNAUDITED)

11. ACQUISITIONS

Acquisition of F&M Bancorporation Inc. – On April 1, 2014, the Company completed the acquisition of F&M Bancorporation Inc. (“FMBC”) and its wholly-owned subsidiary The F&M Bank & Trust Company (collectively, “F&M”) headquartered in Tulsa, Oklahoma. F&M operated 13 banking locations: 9 in Tulsa, Oklahoma and surrounding areas; 3 in Dallas, Texas; and 1 (a loan production office) in Oklahoma City, Oklahoma. The Company acquired FMBC to further expand its Oklahoma and Dallas, Texas area markets. The acquisition was not considered significant to the Company’s financial statements and therefore pro forma financial data and related disclosures are not included.

The Company acquired loans and deposits with fair values of $1.60 billion and $2.27 billion, respectively, at acquisition date. Under the terms of the definitive agreement, the Company issued 3,298,022 shares of Company common stock plus $34.2 million in cash for all outstanding shares of FMBC capital stock for total merger consideration of $252.4 million based on the Company’s closing stock price of $66.15. During 2014, the Company recognized goodwill of $198.2 million. As of March 31, 2015, total goodwill related to the F&M acquisition was $206.0 million, after recording a $7.8 million measurement period adjustment during the first quarter 2015. 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 $27.1 million of core deposit intangibles related to this acquisition.

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. 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 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;

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• 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 listed from time to time in the Company’s 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 you 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 you not to place 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 interim 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, 2014.

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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 March 31, 2015, the Bank operated 244 full-service banking locations; with 61 in the Houston area, including The Woodlands; 30 in the South Texas area including Corpus Christi and Victoria; 36 in the Dallas/Fort Worth area; 22 in the East Texas area; 30 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 9 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 (713) 693-9300. 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 on customer accounts and income from investments 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, stringent cost control practices and acquisitions, including strategic merger transactions. The Company focuses on continual internal growth. Each banking center is operated as a separate profit center, maintaining separate data with respect to its net interest income, efficiency ratio, deposit growth, loan growth and overall profitability. Banking center presidents and managers are accountable for performance in these areas and compensated accordingly. The Company also focuses on maintaining 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 while enabling the Company to minimize operational costs through certain economies of scale. The Company also intends to continue to seek expansion opportunities. During 2013, the Company completed three acquisitions including East Texas Financial Services Inc., Coppermark Bancshares, Inc. and FVNB Corp. During 2014, the Company completed the acquisition of F&M Bancorporation Inc.

Total assets were $21.61 billion at March 31, 2015 compared with $21.51 billion at December 31, 2014, an increase of $99.1 million or 0.5%. Total loans were $9.17 billion at March 31, 2015 compared with $9.24 billion at December 31, 2014, a decrease of $78.2 million or 0.8%. Total deposits were $17.56 billion at March 31, 2015 compared with $17.69 billion at December 31, 2014, a decrease of $131.8 million or 0.7%. Total shareholders’ equity was $3.30 billion at March 31, 2015 compared with $3.24 billion at December 31, 2014, an increase of $57.0 million or 1.8%.

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, 2014. 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 determination of the allowance for credit losses has two components, the allowance for legacy credit losses, which includes the allowance for acquired legacy loans, and the allowance for acquired credit losses for fair-valued acquired loans. 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, refer to the “Financial Condition – Allowance for Credit Losses” section below.  

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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” section 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. The Company has 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 described in the preceding paragraph 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 values 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 March 31, 2015. Other identifiable 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 amortizable 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, 2014, management does not believe any of its goodwill is impaired as of March 31, 2015 because the fair value of the Company’s equity exceeded its carrying value. While the Company believes no impairment existed at March 31, 2015, 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.

Stock-Based Compensation—The Company accounts for stock-based employee compensation plans using the fair value-based method of accounting. The Company’s results of operations reflect compensation expense for all employee stock-based compensation. The fair value of stock options granted is estimated at the date of grant using the Black-Scholes option-pricing model. This model requires the input of subjective assumptions including stock price volatility and employee turnover that are utilized to measure compensation expense.

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.

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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.

RECENT ACQUISITION

Acquisition of F&M Bancorporation Inc. – On April 1, 2014, the Company completed the acquisition of F&M Bancorporation Inc. (“FMBC”) and its wholly-owned subsidiary The F&M Bank & Trust Company (collectively “F&M”) headquartered in Tulsa, Oklahoma. F&M operated 13 banking locations: 9 in Tulsa, Oklahoma and surrounding areas; 3 in Dallas, Texas and 1 (a loan production office) in Oklahoma City, Oklahoma. As of March 31, 2014, FMBC reported on a consolidated basis, total assets of $2.41 billion, total loans of $1.74 billion and total deposits of $2.27 billion, each at book value.

RESULTS OF OPERATIONS

Net income available to common shareholders was $73.6 million ($1.05 per common share on a diluted basis) for the quarter ended March 31, 2015 compared with $67.1 million ($1.01 per common share on a diluted basis) for the quarter ended March 31, 2014, an increase in net income of $6.5 million or 9.7%. The Company posted returns on average common equity of 8.98% and 9.52%, returns on average assets of 1.37% and 1.43% and efficiency ratios of 41.83% and 42.04% for the quarters ended March 31, 2015 and 2014, respectively. The efficiency ratio is calculated by dividing total non-interest expense, excluding credit loss provisions, by net interest income plus non-interest income, excluding net gains and losses on the sale of securities and assets. Additionally, taxes are not part of this calculation.

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.”

Net interest income before the provision for credit losses was $162.9 million for the quarter ended March 31, 2015, an increase of $19.2 million or 13.4%, compared with $143.7 million for the first quarter of 2014. The increase in net interest income was primarily due to a $2.37 billion or 14.5% increase in average interest-earning assets, as a result of the F&M acquisition, for the quarter ended March 31, 2015 compared with the quarter ended March 31, 2014.

Interest income on loans was $124.9 million for the quarter ended March 31, 2015, an increase of $17.7 million or 16.6%, compared with $107.1 million for the first quarter of 2014. This was due in part to an increase in average loans outstanding of $1.43 billion or 18.5%. Additionally, during the first quarter of 2015 and 2014, interest income on loans benefitted from purchase accounting loan discount accretion of $19.6 million and $13.5 million, respectively. The Company had $129.9 million of total outstanding discounts on acquired loans, of which $86.2 million was accretable at March 31, 2015.

Interest income on securities was $48.6 million for the quarter ended March 31, 2015, an increase of $1.5 million or 3.2%, compared with $47.1 million for the first quarter of 2014. This was due in part to an increase in average securities of $774.5 million or 9.1%, partially offset by a 12 basis point decrease in average rates from 2.25% at March 31, 2014 to 2.13% at March 31, 2015.

Average interest-bearing liabilities increased $1.32 billion to $13.21 billion for the quarter ended March 31, 2015 compared with $11.89 billion for the same period in 2014. The net interest margin on a tax equivalent basis decreased 5 basis points from 3.62% for the quarter ended March 31, 2014 to 3.57% for the quarter ended March 31, 2015.

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The following table presents, 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 March 31,
	2015							2014
	Average Outstanding Balance			Interest Earned/ Interest Paid		Average Yield/Rate (4)		Average Outstanding Balance			Interest Earned/ Interest Paid		Average Yield/Rate (4)
	(Dollars in thousands)
Assets
Interest-Earning Assets:
Loans	$	9,189,380		$	124,878		5.51%	$	7,755,997		$	107,144		5.60%
Investment securities		9,241,434			48,562		2.13%		8,466,946			47,056		2.25%
Federal funds sold and other earning assets		267,672			165		0.25%		101,700			48		0.19%
Total interest-earning assets		18,698,486		$	173,605		3.77%		16,324,643		$	154,248		3.83%
Allowance for credit losses		(80,681	)						(67,222	)
Noninterest-earning assets		2,871,702							2,550,893
Total assets	$	21,489,507						$	18,808,314
Liabilities and Shareholders' Equity
Interest-Bearing Liabilities:
Interest-bearing demand deposits	$	4,178,883		$	2,583		0.25%	$	3,554,366		$	2,132		0.24%
Savings and money market deposits		5,542,081			3,405		0.25%		4,992,442			3,155		0.26%
Certificates and other time deposits		2,956,038			3,589		0.49%		2,816,701			4,100		0.59%
Other borrowings		72,118			129		0.73%		51,932			158		1.23%
Securities sold under repurchase agreements		340,469			203		0.24%		347,747			237		0.28%
Junior subordinated debentures		119,408			791		2.69%		124,231			775		2.53%
Total interest-bearing liabilities		13,208,997			10,700		0.33%		11,887,419			10,557		0.36%
Noninterest-Bearing Liabilities:
Noninterest-bearing demand deposits		4,899,279							4,018,094
Other liabilities		100,648							82,288
Total liabilities		18,208,924							15,987,801
Shareholders' equity		3,280,583							2,820,513
Total liabilities and shareholders' equity	$	21,489,507						$	18,808,314
Net interest rate spread							3.44%							3.47%
Net interest income and margin (1) (2)				$	162,905		3.53%				$	143,691		3.57%
Net interest income and margin (tax equivalent) (3)				$	164,569		3.57%				$	145,743		3.62%

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

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

(3) 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%.

(4) Annualized and based on an actual/365 day basis for the three months ended March 31, 2015 and 2014.

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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 March 31,
	2015 vs. 2014
	Increase
	(Decrease)
	Due to Change in
	Volume			Rate			Total
	(Dollars in thousands)
Interest-Earning assets:
Loans (1)	$	19,801		$	(2,067	)	$	17,734
Investment securities (1)		4,304			(2,798	)		1,506
Federal funds sold and other earning assets		79			38			117
Total increase (decrease) in interest income		24,184			(4,827	)		19,357
Interest-Bearing liabilities:
Interest-bearing demand deposits		375			76			451
Savings and money market deposits		347			(97	)		250
Certificates and other time deposits (1)		203			(714	)		(511	)
Securities sold under repurchase agreements		(5	)		(29	)		(34	)
Junior subordinated debentures		(30	)		46			16
Other borrowings		61			(90	)		(29	)
Total increase (decrease) in interest expense		951			(808	)		143
Increase (decrease) in net interest income	$	23,233		$	(4,019	)	$	19,214

(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 $1.3 million provision for credit losses for the quarter ended March 31, 2015 and a $600 thousand provision for the quarter ended March 31, 2014. Net charge-offs were $1.0 million for the quarter ended March 31, 2015 compared with net charge-offs of $786 thousand for the quarter ended March 31, 2014. See "Financial Condition – Allowance for Credit Losses" for more information.

Noninterest Income

The Company’s primary sources of recurring noninterest income are NSF fees, credit, debit, and ATM card income and service charges on deposit accounts. 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 $28.4 million for the three months ended March 31, 2015 compared with $28.7 million for the same period in 2014, a decrease of $243 thousand or 0.8%.  This was due to a decrease in NSF fees and gain on sale of assets partially offset by increases in all other categories.

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

	Three Months Ended March 31,
	2015		2014
	(Dollars in thousands)
Nonsufficient funds (NSF) fees	$	7,918	$	8,870
Credit card, debit card and ATM card income		5,638		5,152
Service charges on deposit accounts		4,179		3,609
Trust income		2,009		1,800
Mortgage income		1,148		593
Brokerage income		1,409		1,269
Bank owned life insurance income		1,380		1,028
Net gain on sale of assets		1,379		3,310
Other		3,361		3,033
Total noninterest income	$	28,421	$	28,664

Noninterest Expense

Noninterest expense totaled $79.5 million for the quarter ended March 31, 2015 compared with $71.1 million for the quarter ended March 31, 2014, an increase of $8.4 million or 11.8%. This increase was primarily due to increased salary and benefits expense, increased regulatory assessments and FDIC insurance, and operational expenses associated with the addition of F&M, partially offset by a decrease in professional fees.

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

	Three Months Ended March 31,
	2015		2014
	(Dollars in thousands)
Salaries and employee benefits (1)	$	49,966	$	43,408
Non-staff expenses:
Net occupancy and equipment		5,964		5,339
Credit and debit card, data processing and software amortization		3,817		3,184
Regulatory assessments and FDIC insurance		4,354		2,726
Core deposit intangibles amortization		2,489		2,045
Depreciation		2,916		3,201
Communications (2)		2,809		2,737
Other real estate expense		132		396
Professional fees		201		1,052
Printing and supplies		512		543
Other		6,302		6,463
Total noninterest expense	$	79,462	$	71,094

(1)	Includes stock based compensation expense of $2.8 million and $1.2 million for the three months ended March 31, 2015 and 2014, respectively.
(2)	Communications expense includes telephone, data circuits, postage, and courier expenses.

Income Taxes

Income tax expense increased $3.4 million or 10.3%, to $37.0 million for the quarter ended March 31, 2015 compared with $33.5 million for the same period in 2014. The increase was primarily attributable to higher pretax net earnings for the three months ended March 31, 2015 compared with the same period in 2014. The Company’s effective tax rate for the three months ended March 31, 2015 and 2014 was 33.4% and 33.1%, respectively.

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FINANCIAL CONDITION

Loan Portfolio

At March 31, 2015 total loans were $9.17 billion, a decrease of $78.2 million or 0.8% compared with $9.24 billion at December 31, 2014. Loans at March 31, 2015 included $10.6 million of loans held for sale. Average outstanding loans at March 31, 2015 represented 49.1% of average interest-earning assets for the quarter ended March 31, 2015.

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. The Company separates its loan portfolio into two general categories of loans: (1) 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 are referred to as “legacy loans” and (2) “acquired loans,” which are loans acquired in a business combination. Those acquired loans that are renewed or substantially modified after the date of the business combination, which therefore causes them to become subject 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 “Non-PCI loans” and “PCI loans” (purchased credit impaired 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.

	March 31, 2015
			Acquired Loans
	Legacy Loans		Acquired Legacy Loans		Non-PCI Loans		PCI Loans		Total Loans
	(Dollars in thousands)
Residential mortgage loans held for sale	$	10,622	$	-	$	-	$	-	$	10,622
Commercial and industrial		852,270		518,061		333,768		19,022		1,723,121
Real estate:
Construction, land development and other land loans		852,715		91,988		94,870		1,272		1,040,845
1-4 family residential (including home equity)		1,921,457		98,510		506,249		5,844		2,532,060
Commercial real estate (including multi-family residential)		1,942,799		281,813		774,360		22,684		3,021,656
Farmland		267,056		14,205		98,593		449		380,303
Agriculture		99,817		66,169		10,495		55		176,536
Consumer and other		205,605		32,272		42,985		-		280,862
Total loans held for investment		6,141,719		1,103,018		1,861,320		49,326		9,155,383
Total	$	6,152,341	$	1,103,018	$	1,861,320	$	49,326	$	9,166,005

	December 31, 2014
			Acquired Loans
	Legacy Loans		Acquired Legacy Loans		Non-PCI Loans		PCI Loans		Total Loans
	(Dollars in thousands)
Residential mortgage loans held for sale	$	8,602	$	-	$	-	$	-	$	8,602
Commercial and industrial		846,665		518,855		414,647		26,100		1,806,267
Real estate:
Construction, land development and other land loans		801,321		114,066		109,946		1,142		1,026,475
1-4 family residential (including home equity)		1,877,843		94,331		535,479		5,926		2,513,579
Commercial real estate (including multi-family residential)		1,883,267		263,904		859,702		23,467		3,030,340
Farmland		244,162		13,520		103,809		452		361,943
Agriculture		105,448		72,051		12,149		55		189,703
Consumer and other		189,161		56,839		61,274		-		307,274
Total loans held for investment		5,947,867		1,133,566		2,097,006		57,142		9,235,581
Total	$	5,956,469	$	1,133,566	$	2,097,006	$	57,142	$	9,244,183

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Nonperforming Assets

Nonperforming assets include loans on nonaccrual status, accruing loans 90 days past due or more, 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.

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.

Nonperforming assets decreased $1.5 million or 4.2% to $35.4 million at March 31, 2015 compared with $36.9 million at December 31, 2014, of which $30.6 million and $30.7 million were attributable to acquired loans, respectively. The ratio of nonperforming assets to loans and other real estate was 0.39% at March 31, 2015 compared with 0.40% at December 31, 2014.

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:

	March 31, 2015
				Acquired Loans
	Legacy Loans			Acquired Legacy Loans			Non-PCI Loans			PCI Loans			Total
	(Dollars in thousands)
Nonaccrual loans (1)	$	3,951		$	10,698		$	3,308		$	11,295		$	29,252
Accruing loans 90 or more days past due		-			2,968			-			-			2,968
Total nonperforming loans		3,951			13,666			3,308			11,295			32,220
Repossessed assets		5			1			40			100			146
Other real estate		784			-			2,149			77			3,010
Total nonperforming assets	$	4,740		$	13,667		$	5,497		$	11,472		$	35,376
Nonperforming assets to total loans and other real estate by category		0.08	%		1.24	%		0.29	%		23.22	%		0.39	%

	December 31, 2014
				Acquired Loans
	Legacy Loans			Acquired Legacy Loans			Non-PCI Loans			PCI Loans			Total
	(Dollars in thousands)
Nonaccrual loans (1)	$	4,197		$	11,194		$	2,947		$	13,084		$	31,422
Accruing loans 90 or more days past due		377			1,816			-			-		$	2,193
Total nonperforming loans		4,574			13,010			2,947			13,084			33,615
Repossessed assets		12			-			55			-			67
Other real estate		1,608			23			1,556			50			3,237
Total nonperforming assets	$	6,194		$	13,033		$	4,558		$	13,134		$	36,919
Nonperforming assets to total loans and other real estate by category		0.10	%		1.15	%		0.22	%		22.96	%		0.40	%

(1) Includes troubled debt restructurings of $766 thousand and $911 thousand as of March 31, 2015 and December 31, 2014, respectively.

Nonperforming assets were 0.39% of total loans and other real estate at March 31, 2015 compared with 0.40% of total loans and other real estate at December 31, 2014. Nonperforming assets were 0.08% of total legacy loans and other real estate at March 31, 2015 compared with 0.10% of total legacy loans and other real estate at December 31, 2014. Nonperforming assets were 1.24% of total acquired legacy loans and other real estate at March 31, 2015 compared with 1.15% of total acquired legacy loans and other real estate at December 31, 2014. Nonperforming assets were 0.29% of total Non-PCI loans and other real estate and 23.22% of total PCI loans and other real estate at March 31, 2015 compared with 0.22% of total Non-PCI and other real estate and 22.96% of total PCI loans and other real estate at December 31, 2014. The allowance for credit losses as a percentage of total nonperforming loans was 251.3% at March 31, 2015 and 240.3% at December 31, 2014. The Company had 1 loan modified in a troubled debt restructuring for the three months ended March 31, 2015 with both a quarter end investment and a balance at the date of restructure of $10 thousand.

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Allowance for Credit Losses

The following table presents, as of and for the periods indicated, an analysis of the allowance for credit losses and other related data:

	As of and for the Three Months Ended March 31,
	2015			2014
	(Dollars in thousands)
Average loans outstanding	$	9,189,380		$	7,755,997
Gross loans outstanding at end of period	$	9,166,005		$	7,752,400
Allowance for credit losses at beginning of period	$	80,762		$	67,282
Provision for credit losses		1,250			600
Charge-offs:
Commercial and industrial		(728	)		(143	)
Real estate and agriculture		(292	)		(256	)
Consumer and other		(729	)		(1,046	)
Recoveries:
Commercial and industrial		224			62
Real estate and agriculture		106			163
Consumer and other		370			434
Net charge-offs		(1,049	)		(786	)
Allowance for credit losses at end of period	$	80,963		$	67,096
Ratio of allowance to end of period loans		0.88	%		0.87	%
Ratio of net charge-offs to average loans (annualized)		0.05	%		0.04	%
Ratio of allowance to end of period nonperforming loans		251.3	%		597.3	%

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 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, further adjustments may be necessary if economic conditions 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.

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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, through back-testing, the Company is able to adjust the outputs of the analysis for 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 delineates 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 which 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. In the event that 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.

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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. In the event that a deterioration in 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. In the Company’s case, the $201 thousand increase in the allowance for credit losses at March 31, 2015 compared with December 31, 2014 is primarily attributable to the increase in specific reserves.

 Beginning in 2013, the Company began to further disaggregate its allowance for credit losses to distinguish between the portion of the allowance attributed to legacy loans and the portion attributed to acquired loans.

The following table presents, as of and for the period 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 Three Months Ended March 31, 2015
				Acquired
	Legacy Loans			Loans			Total
	(Dollars in thousands)
Average loans outstanding	$	5,680,799		$	3,508,581		$	9,189,380
Gross loans outstanding at end of period	$	6,152,341		$	3,013,664		$	9,166,005
Allowance for credit losses at beginning of period	$	61,745		$	19,017		$	80,762
Provision for credit losses		883			367			1,250
Charge-offs:
Commercial and industrial		(317	)		(411	)		(728	)
Real estate and agriculture		(151	)		(141	)		(292	)
Consumer and other		(718	)		(11	)		(729	)
Recoveries:
Commercial and industrial		208			16			224
Real estate and agriculture		106			-			106
Consumer and other		370			-			370
Net charge-offs		(502	)		(547	)		(1,049	)
Allowance for credit losses at end of period	$	62,126		$	18,837		$	80,963
Ratio of allowance to end of period loans		1.01	%		0.63	%		0.88	%
Ratio of net charge-offs to average loans (annualized)		0.04	%		0.06	%		0.05	%
Ratio of allowance to end of period nonperforming loans		1572.4	%		66.6	%		251.3	%

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The Company had gross charge-offs on legacy loans of $1.2 million during the three months ended March 31, 2015. Partially offsetting these charge-offs were recoveries on legacy loans of $684 thousand. Total charge-offs for the three months ended March 31, 2015 were $1.7 million, partially offset by total recoveries of $700 thousand.

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.

	March 31, 2015
			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	$	17,504	$	11,168	$	-	$	1,412	$	30,084		22.0	%
Real estate		41,316		4,858		-		-		46,174		70.6	%
Agriculture and agriculture real estate		2,032		1,245		-		-		3,277		5.7	%
Consumer and other		1,274		154		-		-		1,428		1.7	%
Total allowance for credit losses	$	62,126	$	17,425	$	-	$	1,412	$	80,963		100.0	%

	December 31, 2014
			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	$	17,511	$	11,818	$	673	$	-	$	30,002		19.5	%
Real estate		40,138		4,580		228		-		44,946		71.2	%
Agriculture and agriculture real estate		2,278		1,440		4		-		3,722		6.0	%
Consumer and other		1,818		123		151		-		2,092		3.3	%
Total allowance for credit losses	$	61,745	$	17,961	$	1,056	$	-	$	80,762		100.0	%

At March 31, 2015, the allowance for credit losses totaled $81.0 million compared with $80.8 million at December 31, 2014, an increase of $201 thousand or 0.2%. The allowance for credit losses at March 31, 2015 totaled 0.88% of total loans compared with 0.87% of total loans at December 31, 2014.

At March 31, 2015, $62.1 million of the allowance was attributable to legacy loans, an increase of $381 thousand or 0.6% compared with the allowance of $61.7 million attributable to legacy loans at December 31, 2014. At March 31, 2015, $17.4 million of the allowance for credit losses was attributable to acquired legacy loans compared with $18.0 million of the allowance at December 31, 2014, a decrease of $536 thousand or 3.0%. There was no allowance attributable to Non-PCI loans at March 31, 2015 compared with $1.1 million of the allowance at December 31, 2014. The decrease was primarily attributable to the charge-off of three impaired loans that had specific reserves identified at December 31, 2014. At March 31, 2015, $1.4 million of the allowance was attributable to PCI loans compared with no allowance at December 31, 2014. The increase was primarily attributable to specific reserves identified for two commercial and industrial loans that have deteriorated in credit quality.

At March 31, 2015, the Company had $129.9 million of total outstanding discounts on Non-PCI and PCI loans, of which $86.2 million was accretable.  

The Company believes that the allowance for credit losses at March 31, 2015 is adequate to cover estimated losses in the loan portfolio as of such date. There can be no assurance, however, that the Company will not sustain losses in future periods, which could be substantial in relation to the size of the allowance at March 31, 2015.

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Securities

The carrying cost of securities totaled $9.58 billion at March 31, 2015 compared with $9.05 billion at December 31, 2014, an increase of $533.7 million or 5.9%. At March 31, 2015, securities represented 44.3% of total assets compared with 42.1% of total assets at December 31, 2014. 

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

	March 31, 2015
			Gross		Gross
	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value
	(Dollars in thousands)
Available for Sale
States and political subdivisions	$	9,205	$	99	$	-		$	9,304
Collateralized mortgage obligations		31,792		99		(14	)		31,877
Mortgage-backed securities		72,864		4,846		(13	)		77,697
Other securities		12,589		304		(26	)		12,867
Total	$	126,450	$	5,348	$	(53	)	$	131,745
Held to Maturity
U.S. Treasury securities and obligations of U.S. Government agencies	$	52,393	$	926	$	-		$	53,319
States and political subdivisions		376,080		6,498		(1,352	)		381,226
Collateralized mortgage obligations		13,826		124		(3	)		13,947
Mortgage-backed securities		9,005,452		125,414		(43,255	)		9,087,611
Total	$	9,447,751	$	132,962	$	(44,610	)	$	9,536,103

	December 31, 2014
			Gross		Gross
	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value
	(Dollars in thousands)
Available for Sale
States and political subdivisions	$	14,402	$	183	$	-		$	14,585
Collateralized mortgage obligations		33,519		91		(37	)		33,573
Mortgage-backed securities		79,153		5,344		(14	)		84,483
Other securities		12,588		201		(31	)		12,758
Total	$	139,662	$	5,819	$	(82	)	$	145,399
Held to Maturity
U.S. Treasury securities and obligations of U.S. Government agencies	$	52,353	$	360	$	(74	)	$	52,639
States and political subdivisions		404,356		6,147		(1,422	)		409,081
Collateralized mortgage obligations		19,585		215		(8	)		19,792
Mortgage-backed securities		8,424,083		96,650		(53,553	)		8,467,180
Total	$	8,900,377	$	103,372	$	(55,057	)	$	8,948,692

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.

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When OTTI occurs under either model, the amount of the other-than-temporary impairment 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 shall 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 shall 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 shall become the new amortized cost basis of the investment.

As of March 31, 2015, management does not have the intent to sell any of its securities and believes that it is more likely than not that the Company will not have to sell any such 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 March 31, 2015, 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 $17.56 billion at March 31, 2015 compared with $17.69 billion at December 31, 2014, a decrease of $131.8 million or 0.7%. At March 31, 2015, noninterest-bearing deposits totaled $5.04 billion compared with $4.94 billion at December 31, 2014, an increase of $102.0 million or 2.1%. Interest-bearing deposits totaled $12.52 billion at March 31, 2015 compared with $12.76 billion at December 31, 2014, a decrease of $233.8 million or 1.8%.

Average deposits for the three months ended were $17.58 billion as of March 31, 2015, an increase of $2.19 billion or 14.3%, compared with $15.38 billion as of March 31, 2014. Deposit growth was impacted by the acquisition of F&M. Deposits for F&M totaled $2.27 billion at acquisition date. The ratio of average interest-bearing deposits to total average deposits was 72.1% during the first three months of 2015 compared to 73.9% during the first three months of 2014.

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

	Three Months Ended March 31,
	2015					2014
	Average		Average			Average		Average
	Balance		Rate			Balance		Rate
	(Dollars in thousands)
Interest-bearing demand deposits	$	4,178,883		0.25	%	$	3,554,366		0.24	%
Regular savings		1,797,979		0.20	%		1,591,701		0.21	%
Money market savings		3,744,102		0.27	%		3,400,741		0.28	%
Certificates and other time deposits		2,956,038		0.49	%		2,816,701		0.59	%
Total interest-bearing deposits		12,677,002		0.31	%		11,363,509		0.34	%
Noninterest-bearing deposits		4,899,279					4,018,094
Total deposits	$	17,576,281		0.22	%	$	15,381,603		0.25	%

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Other Borrowings

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

	March 31,		December 31,
	2015		2014
	(Dollars in thousands)
FHLB advances	$	325,000	$	-
FHLB long-term notes payable		6,914		8,724
Total other borrowings		331,914		8,724
Securities sold under repurchase agreements		318,418		315,523
Total	$	650,332	$	324,247

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, overnight 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 March 31, 2015, the Company had total funds of $5.77 billion available under this agreement, of which $332.0 million was outstanding. Short-term overnight FHLB advances of $325.0 million were outstanding at March 31, 2015, at a weighted average rate of 0.07%. Long-term notes payable were $6.9 million at March 31, 2015, with a weighted average rate of 5.62%. The maturity dates on the FHLB notes payable range from the years 2015 to 2027 and have interest rates ranging from 4.51% to 6.10%.

Securities sold under repurchase agreements— At March 31, 2015, the Company had $318.4 million in securities sold under repurchase agreements compared with $315.5 million at December 31, 2014, an increase of $2.9 million or 0.9%. Repurchase agreements with banking customers are generally settled on the following business day; however, approximately $17.9 million of the repurchase agreements outstanding at March 31, 2015 have maturity dates ranging from 3 to 24 months. All securities sold under agreements to repurchase are collateralized by certain pledged securities.

Junior Subordinated Debentures

During the first quarter of 2015, the Company redeemed all of its outstanding junior subordinated debentures. Accordingly, as of March 31, 2015, the Company had no junior subordinated debentures outstanding compared with $167.5 million at December 31, 2014.

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 these external funding sources. The cash and federal funds sold position, supplemented by amortizing investment and loan portfolios, has generally created an adequate liquidity position.

As of March 31, 2015, the Company had outstanding $1.9 billion in commitments to extend credit and $98.4 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 March 31, 2015, the Company had cash and cash equivalents of $354.3 million compared with $677.9 million at December 31, 2014, a decrease of $323.6 million. The decrease was primarily due to the purchase of $1.55 billion of securities, the redemption of $167.5 million of junior subordinated debentures, an increase in securities sold under repurchase agreements of $2.9 million, a decrease in deposits of $131.4 million, and dividends paid of $19.1 million. This decrease was partially offset by proceeds from the maturities and repayments of securities of $1.01 billion, a decrease in loans of $97.8 million, net proceeds from short-term borrowings of $325.0 million and net earnings of $73.6 million.

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Contractual Obligations 

The following table summarizes the Company’s contractual obligations and other commitments to make future payments as of March 31, 2015 (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 March 31, 2015 are summarized below. Payments for FHLB borrowings include interest of $1.3 million that will be paid over the future periods. Payments related to leases are based on actual payments specified in underlying contracts.

			More than 1		3 years or
			year but less		more but less		5 years
	1 year or less		than 3 years		than 5 years		or more		Total
	(Dollars in thousands)
Federal Home Loan Bank notes payable	$	326,062	$	1,803	$	4,648	$	722	$	333,235
Operating leases		6,633		9,066		4,205		7,693		27,597
Total	$	332,695	$	10,869	$	8,853	$	8,415	$	360,832

Off-Balance Sheet Items

In the normal course of business, the Company enters into various transactions, which, in accordance with accounting principles generally accepted in the United States, 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 March 31, 2015 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:

			More than 1		3 years or
			year but less		more but less		5 years
	1 year or less		than 3 years		than 5 years		or more		Total
	(Dollars in thousands)
Standby letters of credit	$	80,087	$	17,273	$	1,086	$	-	$	98,446
Commitments to extend credit		867,449		601,245		56,277		390,714		1,915,685
Total	$	947,536	$	618,518	$	57,363	$	390,714	$	2,014,131

Capital Resources

Total shareholders’ equity was $3.30 billion at March 31, 2015 compared with $3.24 billion at December 31, 2014, an increase of $57.0 million or 1.8%. The increase was due primarily to net income of $73.6 million, which was partially offset by dividends paid of $19.1 million and stock based compensation expense of $2.8 million for the three months ended March 31, 2015.

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. Among other things, the Basel III Capital Rules introduced a new capital measure called “Common Equity Tier 1,” which is a comparison of the sum of certain equity capital components to total risk-weighted assets, and revised the risk-weighting approach of the capital ratios with a more risk-sensitive approach that expanded the risk-weighting categories from the previous Basel I derived categories to a much larger and more risk-sensitive number of categories, depending on the nature of the assets.

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Financial institutions are categorized as well capitalized or adequately capitalized based on minimum total risk-based, Tier 1 risk-based, common equity Tier 1 and Tier 1 leverage ratios. As of March 31, 2015, the Company’s capital ratios exceeded the regulatory definition of adequately capitalized and the Bank’s capital ratios were above the levels required for the Bank to be designated as “well capitalized” by the FDIC.

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 March 31, 2015:

			To Be Categorized As
	Minimum Required		Well Capitalized Under
	For Capital		Prompt Corrective		Actual Ratio as of
	Adequacy Purposes		Action Provisions		March 31, 2015
The Company
Common equity Tier 1 capital (to risk weighted asssets )		4.50%	N/A			12.40%
Tier 1 capital (to risk weighted assets)		6.00%	N/A			12.40%
Total capital (to risk weighted assets)		8.00%	N/A			13.14%
Tier 1 capital (to average assets)		4.00% (1)	N/A			6.96%
The Bank
Common equity Tier 1 capital (to risk weighted asssets )		4.50%		6.50%		12.29%
Tier 1 capital (to risk weighted assets)		6.00%		8.00%		12.29%
Total capital (to risk weighted assets)		8.00%		10.00%		13.02%
Tier 1 capital (to average assets)		4.00% (2)		5.00%		6.89%

(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 which is composed 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, 2014, filed on March 2, 2015, for further discussion.

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 March 31, 2015 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

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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. The Company and Bank believe, after consultations with legal counsel, 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, 2014.

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.

54

Table Of Contents

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: 05/8/15	/S/    DAVID ZALMAN
	David Zalman
	Chairman and Chief Executive Officer
Date: 05/8/15	/S/    DAVID HOLLAWAY
	David Hollaway
	Chief Financial Officer

55

EX-31.1

Exhibit 31.1

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER PURSUANT TO RULE 13a-14(a) OF THE

SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

	I, David Zalman, certify that:
1.	I have reviewed this quarterly report on Form 10-Q of Prosperity Bancshares, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 8, 2015

/s/ David Zalman

David Zalman

Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION OF THE CHIEF FINANCIAL OFFICER PURSUANT TO RULE 13a-14(a) OF THE

SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

	I, David Hollaway, certify that:
1.	I have reviewed this quarterly report on Form 10-Q of Prosperity Bancshares, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 8, 2015

/s/ David Hollaway

David Hollaway

Chief Financial Officer

EX-32.1

Exhibit 32.1

Certification Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the quarterly report of Prosperity Bancshares, Inc. (the “Company”) on Form 10-Q for the period ending March 31, 2015 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, David Zalman, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and operating results of the Company.

/s/ David Zalman

David Zalman

Chief Executive Officer

May 8, 2015

EX-32.2

Exhibit 32.2

Certification Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the quarterly report of Prosperity Bancshares, Inc. (the “Company”) on Form 10-Q for the period ending March 31, 2015 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, David Hollaway, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and operating results of the Company.

/s/ David Hollaway

David Hollaway

Chief Financial Officer

May 8, 2015

XML

Note 5 - Loans and Allowance for Credit Losses (Details) - Purchased Credit Impaired Loans (PCI Loans [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
PCI Loans [Member]
PCI loans:
Outstanding balance	$ 100,973	$ 129,412
Less: discount	51,647	72,270
Recorded investment	$ 49,326	$ 57,142

XML

Note 9 - Contractual Obigations and Off-Balance Sheet Items (Details) (To be Paid Over Future Periods [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
To be Paid Over Future Periods [Member]
Note 9 - Contractual Obigations and Off-Balance Sheet Items (Details) [Line Items]
Interest Expense, Federal Home Loan Bank and Federal Reserve Bank Advances, Long-term	$ 1.3

XML

Note 6 - Fair Value (Details) - Fair Value Assets and Liabilities Measured on Recurring Basis (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Available for sale securities:
Available for sale securities	$ 131,745	$ 145,399
Non-hedging interest rate swap		303
Liabilities:
Non-hedging interest rate swap	(450)	(303)
Not Designated as Hedging Instrument [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Non-hedging interest rate swap	450
Not Designated as Hedging Instrument [Member]
Available for sale securities:
Non-hedging interest rate swap	450
Fair Value, Inputs, Level 1 [Member] | Other Debt Obligations [Member]
Available for sale securities:
Available for sale securities	12,867	12,758
Fair Value, Inputs, Level 1 [Member]
Available for sale securities:
Available for sale securities	12,867	12,758
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Available for sale securities:
Available for sale securities	9,304	14,585
Fair Value, Inputs, Level 2 [Member] | Collateralized Debt Obligations [Member]
Available for sale securities:
Available for sale securities	31,877	33,573
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member]
Available for sale securities:
Available for sale securities	77,697	84,483
Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Available for sale securities	118,878	132,641
Non-hedging interest rate swap		303
Liabilities:
Non-hedging interest rate swap	(450)	(303)
US States and Political Subdivisions Debt Securities [Member]
Available for sale securities:
Available for sale securities	9,304	14,585
Collateralized Debt Obligations [Member]
Available for sale securities:
Available for sale securities	31,877	33,573
Collateralized Mortgage Backed Securities [Member]
Available for sale securities:
Available for sale securities	77,697	84,483
Other Debt Obligations [Member]
Available for sale securities:
Available for sale securities	$ 12,867	$ 12,758

XML

Note 9 - Contractual Obigations and Off-Balance Sheet Items (Details) - Contractual Obligations and Other Commitments (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Note 9 - Contractual Obigations and Off-Balance Sheet Items (Details) - Contractual Obligations and Other Commitments [Line Items]
1 year or less	$ 947,536
More than 1 year but less than 3 years	618,518
3 years or more but less than 5 years	57,363
5 years or more	390,714
Total	2,014,131
Federal Home Loan Bank Advances [Member]
Note 9 - Contractual Obigations and Off-Balance Sheet Items (Details) - Contractual Obligations and Other Commitments [Line Items]
1 year or less	326,062
More than 1 year but less than 3 years	1,803
3 years or more but less than 5 years	4,648
5 years or more	722
Total	333,235
Operating Leases [Member]
Note 9 - Contractual Obigations and Off-Balance Sheet Items (Details) - Contractual Obligations and Other Commitments [Line Items]
1 year or less	6,633
More than 1 year but less than 3 years	9,066
3 years or more but less than 5 years	4,205
5 years or more	7,693
Total	27,597
Lease, Total [Member]
Note 9 - Contractual Obigations and Off-Balance Sheet Items (Details) - Contractual Obligations and Other Commitments [Line Items]
1 year or less	332,695
More than 1 year but less than 3 years	10,869
3 years or more but less than 5 years	8,853
5 years or more	8,415
Total	$ 360,832

XML

Note 5 - Loans and Allowance for Credit Losses (Details) - Troubled Debt Restructurings (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Troubled Debt Restructurings
Troubled debt restructurings, number of contracts	1	2
Troubled debt restructurings, pre-modification outstanding recorded investment	$ 10	$ 51
Troubled debt restructurings, post-modification outstanding recorded investment	10	51
Commercial Real Estate (Includes Multi-Family Residential) [Member]
Troubled Debt Restructurings
Troubled debt restructurings, number of contracts		1
Troubled debt restructurings, pre-modification outstanding recorded investment		35
Troubled debt restructurings, post-modification outstanding recorded investment		35
Commercial and Industrial [Member]
Troubled Debt Restructurings
Troubled debt restructurings, number of contracts		1
Troubled debt restructurings, pre-modification outstanding recorded investment		16
Troubled debt restructurings, post-modification outstanding recorded investment		16
Consumer and Other [Member]
Troubled Debt Restructurings
Troubled debt restructurings, number of contracts	1
Troubled debt restructurings, pre-modification outstanding recorded investment	10
Troubled debt restructurings, post-modification outstanding recorded investment	$ 10

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Note 4 - Securities (Details) - Investment Securities by Contractual Maturity (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investment Securities by Contractual Maturity [Abstract]
Due in one year or less	$ 35,021
Due in one year or less	35,145
Due in one year or less	12,689
Due in one year or less	12,969
Due after one year through five years	176,412
Due after one year through five years	178,087
Due after one year through five years	4,616
Due after one year through five years	4,658
Due after five years through ten years	163,600
Due after five years through ten years	167,669
Due after five years through ten years	3,859
Due after five years through ten years	3,907
Due after ten years	53,440
Due after ten years	53,644
Due after ten years	630
Due after ten years	637
Subtotal	428,473
Subtotal	434,545
Subtotal	21,794
Subtotal	22,171
Mortgage-backed securities and collateralized mortgage obligations	9,019,278
Mortgage-backed securities and collateralized mortgage obligations	9,101,558
Mortgage-backed securities and collateralized mortgage obligations	104,656
Mortgage-backed securities and collateralized mortgage obligations	109,574
Total	9,447,751	8,900,377
Total	9,536,103	8,948,692
Total	126,450
Total	$ 131,745	$ 145,399

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Note 10 - Other Comprehensive (Loss) Income (Details) - Tax Effects Allocated to Each Component of Other Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Securities available for sale:
Change in unrealized gain uring period	$ (442)	$ (489)
Change in unrealized gain uring period	155	171
Change in unrealized gain uring period	(287)	(318)
Total securities available for sale	(442)	(489)
Total securities available for sale	155	171
Total securities available for sale	(287)	(318)
Total other comprehensive loss	(442)	(489)
Total other comprehensive loss	155	171
Total other comprehensive loss	$ (287)	$ (318)

XML

Note 7 - Goodwill and Core Deposit Intangibles (Tables)

3 Months Ended

Mar. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Goodwill [Table Text Block]

			Core Deposit
	Goodwill		Intangibles
	(Dollars in thousands)
Balance as of December 31, 2013	$	1,671,520	$	42,049
Less:
Amortization		-		(9,940	)
Add:
Measurement period adjustments		4,426		(302	)
Acquisition of F&M Bancorporation Inc.		198,245		27,140
Balance as of December 31, 2014		1,874,191		58,947
Less:
Amortization		-		(2,489	)
Add:
Measurement period adjustments		7,764		-
Balance as of March 31, 2015	$	1,881,955	$	56,458

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Remaining 2015	$	7,041
2016		8,519
2017		6,327
2018		5,400
2019		4,546
Thereafter		24,625
Total	$	56,458

XML

Note 7 - Goodwill and Core Deposit Intangibles (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Note 7 - Goodwill and Core Deposit Intangibles (Details) [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss			$ 0
Amortization of Intangible Assets	$ 2,489,000	$ 2,045,000	$ 9,940,000
Core Deposits [Member] | Minimum [Member]
Note 7 - Goodwill and Core Deposit Intangibles (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Core Deposits [Member] | Maximum [Member]
Note 7 - Goodwill and Core Deposit Intangibles (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years

XML

Note 5 - Loans and Allowance for Credit Losses (Details) - Changes in Accretable Yield for Non PCI Loans (Non PCI Loans [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Non PCI Loans [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) - Changes in Accretable Yield for Non PCI Loans [Line Items]
Balance at beginning of period	$ 89,105	$ 87,798
Accretion charge-offs	(457)	(48)
Accretion	(10,359)	(10,587)
Balance at March 31	$ 78,289	$ 77,163

XML

Note 5 - Loans and Allowance for Credit Losses (Details) - Past Due Loans (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 days past due and still accruing	$ 40,950		$ 44,519
Loans 90 or more days past due and still accruing	2,968		2,193
Loans past due and still accruing	43,918		46,712
Nonaccrual loans	29,252	[1]	31,422	[1]
Current loans	9,092,835		9,166,049
Total loans	9,166,005		9,244,183
Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 days past due and still accruing	6,239		7,667
Loans 90 or more days past due and still accruing	2,128
Loans past due and still accruing	8,367		7,667
Nonaccrual loans	651		526
Current loans	1,031,827		1,018,282
Total loans	1,040,845		1,026,475
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 days past due and still accruing	1,811		2,995
Loans 90 or more days past due and still accruing			377
Loans past due and still accruing	1,811		3,372
Nonaccrual loans	280		96
Current loans	554,748		548,178
Total loans	556,839		551,646
1-4 Family Residential (Includes Home Equity) [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 days past due and still accruing	3,607	[2]	2,261	[2]
Loans 90 or more days past due and still accruing	38	[2]	82	[2]
Loans past due and still accruing	3,645	[2]	2,343	[2]
Nonaccrual loans	3,003	[2]	3,570	[2]
Current loans	2,536,034	[2]	2,516,268	[2]
Total loans	2,542,682	[2],[3]	2,522,181	[2],[3]
Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 days past due and still accruing	10,839		12,679
Loans 90 or more days past due and still accruing	671		65
Loans past due and still accruing	11,510		12,744
Nonaccrual loans	8,373		6,340
Current loans	3,001,773		3,011,256
Total loans	3,021,656		3,030,340
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 days past due and still accruing	16,931		18,305
Loans 90 or more days past due and still accruing	131		869
Loans past due and still accruing	17,062		19,174
Nonaccrual loans	16,566		20,537
Current loans	1,689,493		1,766,556
Total loans	1,723,121		1,806,267
Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 days past due and still accruing	1,523		612
Loans 90 or more days past due and still accruing			800
Loans past due and still accruing	1,523		1,412
Nonaccrual loans	379		353
Current loans	278,960		305,509
Total loans	$ 280,862		$ 307,274

[1] Includes troubled debt restructurings of $766 thousand and $911 thousand as of March 31, 2015 and December 31, 2014, respectively.

[2] Includes $10.6 million and $8.6 million of residential mortgage loans held for sale at March 31, 2015 and December 31, 2014, respectively.

[3] Includes $8.6 million of residential mortgage loans held for sale at December 31, 2014.

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Note 7 - Goodwill and Core Deposit Intangibles (Details) - Estimated Aggregate Future Amortization Expense for Intangible Assets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Estimated Aggregate Future Amortization Expense for Intangible Assets [Abstract]
Remaining 2015	$ 7,041
2016	8,519
2017	6,327
2018	5,400
2019	4,546
Thereafter	24,625
Total	$ 56,458	$ 58,947	$ 42,049

XML

Note 6 - Fair Value (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Other Real Estate, Additions	$ 983,000
Real Estate Owned Outstanding	733,000
Additions to Impaired Loans	1,500,000
Impaired Loans Outstanding	$ 1,500,000

XML

Note 1 - Basis of Presentation

3 Months Ended

Mar. 31, 2015

Disclosure Text Block [Abstract]

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

1. BASIS OF PRESENTATION

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

The accompanying unaudited interim consolidated financial statements have been prepared in accordance with generally accepted accounting principles for interim 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 generally accepted accounting principles 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, 2014. Operating results for the three-month period ended March 31, 2015 are not necessarily indicative of the results that may be expected for the year ending December 31, 2015 or any other period.

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Note 5 - Loans and Allowance for Credit Losses (Details) - Impaired Loans (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
With no related allowance recorded:
Impaired loans with no related allowance, recorded investment	$ 11,386	$ 24,682
Impaired loans with no related allowance, unpaid principal balance	11,754	25,052
Impaired loans with no related allowance, average recorded investment	18,218	14,084
With an allowance recorded:
Impaired loans with related allowance, recorded investment	9,545	4,498
Impaired loans with related allowance, unpaid principal balance	11,390	6,300
Impaired loans, related allowance	3,480	2,493
Impaired loans with related allowance, average recorded investment	7,944	4,930
Total:
Impaired loans, recorded investment	20,931	29,180
Impaired loans, unpaid principal balance	23,144	31,352
Impaired loans, related allowance	3,480	2,493
Impaired loans, average recorded investment	26,162	19,014
Construction, Land Development and Other Land Loans [Member]
With no related allowance recorded:
Impaired loans with no related allowance, recorded investment	245	250
Impaired loans with no related allowance, unpaid principal balance	251	256
Impaired loans with no related allowance, average recorded investment	251	264
With an allowance recorded:
Impaired loans with related allowance, recorded investment	276	276
Impaired loans with related allowance, unpaid principal balance	276	276
Impaired loans, related allowance	221	225
Impaired loans with related allowance, average recorded investment	276	138
Total:
Impaired loans, recorded investment	521	526
Impaired loans, unpaid principal balance	527	532
Impaired loans, related allowance	221	225
Impaired loans, average recorded investment	527	402
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
With no related allowance recorded:
Impaired loans with no related allowance, recorded investment	190
Impaired loans with no related allowance, unpaid principal balance	190
Impaired loans with no related allowance, average recorded investment	95	7
With an allowance recorded:
Impaired loans with related allowance, recorded investment	42	46
Impaired loans with related allowance, unpaid principal balance	52	55
Impaired loans, related allowance	21	24
Impaired loans with related allowance, average recorded investment	49	34
Total:
Impaired loans, recorded investment	232	46
Impaired loans, unpaid principal balance	242	55
Impaired loans, related allowance	21	24
Impaired loans, average recorded investment	144	41
1-4 Family Residential (Includes Home Equity) [Member]
With no related allowance recorded:
Impaired loans with no related allowance, recorded investment	1,415	1,710
Impaired loans with no related allowance, unpaid principal balance	1,532	1,831
Impaired loans with no related allowance, average recorded investment	1,621	1,147
With an allowance recorded:
Impaired loans with related allowance, recorded investment	1,188	1,426
Impaired loans with related allowance, unpaid principal balance	1,254	1,473
Impaired loans, related allowance	242	418
Impaired loans with related allowance, average recorded investment	1,340	1,973
Total:
Impaired loans, recorded investment	2,603	3,136
Impaired loans, unpaid principal balance	2,786	3,304
Impaired loans, related allowance	242	418
Impaired loans, average recorded investment	2,961	3,120
Commercial Real Estate (Includes Multi-Family Residential) [Member]
With no related allowance recorded:
Impaired loans with no related allowance, recorded investment	5,392	5,093
Impaired loans with no related allowance, unpaid principal balance	5,426	5,126
Impaired loans with no related allowance, average recorded investment	5,260	3,792
With an allowance recorded:
Impaired loans with related allowance, recorded investment	798	62
Impaired loans with related allowance, unpaid principal balance	2,394	63
Impaired loans, related allowance	507	24
Impaired loans with related allowance, average recorded investment	1,228	838
Total:
Impaired loans, recorded investment	6,190	5,155
Impaired loans, unpaid principal balance	7,820	5,189
Impaired loans, related allowance	507	24
Impaired loans, average recorded investment	6,488	4,630
Commercial and Industrial [Member]
With no related allowance recorded:
Impaired loans with no related allowance, recorded investment	4,003	9,485
Impaired loans with no related allowance, unpaid principal balance	4,194	9,678
Impaired loans with no related allowance, average recorded investment	6,839	4,794
With an allowance recorded:
Impaired loans with related allowance, recorded investment	7,016	2,454
Impaired loans with related allowance, unpaid principal balance	7,171	4,182
Impaired loans, related allowance	2,396	1,597
Impaired loans with related allowance, average recorded investment	4,813	1,783
Total:
Impaired loans, recorded investment	11,019	11,939
Impaired loans, unpaid principal balance	11,365	13,860
Impaired loans, related allowance	2,396	1,597
Impaired loans, average recorded investment	11,652	6,577
Consumer and Other [Member]
With no related allowance recorded:
Impaired loans with no related allowance, recorded investment	141	8,144
Impaired loans with no related allowance, unpaid principal balance	161	8,161
Impaired loans with no related allowance, average recorded investment	4,152	4,080
With an allowance recorded:
Impaired loans with related allowance, recorded investment	225	234
Impaired loans with related allowance, unpaid principal balance	243	251
Impaired loans, related allowance	93	205
Impaired loans with related allowance, average recorded investment	238	164
Total:
Impaired loans, recorded investment	366	8,378
Impaired loans, unpaid principal balance	404	8,412
Impaired loans, related allowance	93	205
Impaired loans, average recorded investment	$ 4,390	$ 4,244

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Note 2 - Income Per Common Share (Details) - Computation of Basic and Diluted Earnings Per Share (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Computation of Basic and Diluted Earnings Per Share [Abstract]
Net income (in Dollars)	$ 73,641	$ 67,137
Basic:
Weighted average shares outstanding	70,034	66,186
Weighted average shares outstanding (in Dollars per share)	$ 1.05	$ 1.01
Add incremental shares for:
Effect of dilutive securities - options	21	94
Total	70,055	66,280
Total (in Dollars per share)	$ 1.05	$ 1.01

XML

Note 2 - Income Per Common Share (Details) (Equity Option [Member])	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Equity Option [Member]
Note 2 - Income Per Common Share (Details) [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0

XML

Note 9 - Contractual Obigations and Off-Balance Sheet Items (Details) - Letters of Credit and Commitments (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Line of Credit Facility [Line Items]
1 year or less	$ 947,536
More than 1 year but less than 3 years	618,518
3 years or more but less than 5 years	57,363
5 years or more	390,714
Total	2,014,131
Commitments to Extend Credit [Member]
Line of Credit Facility [Line Items]
1 year or less	867,449
More than 1 year but less than 3 years	601,245
3 years or more but less than 5 years	56,277
5 years or more	390,714
Total	1,915,685
Financial Standby Letter of Credit [Member]
Line of Credit Facility [Line Items]
1 year or less	80,087
More than 1 year but less than 3 years	17,273
3 years or more but less than 5 years	1,086
Total	$ 98,446

XML

Note 5 - Loans and Allowance for Credit Losses (Details) - Risk Grades and Impaired Loans by Class of Loan (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 9,166,005		$ 9,244,183
Construction, Land Development and Other Land Loans [Member] | Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	19,526
Construction, Land Development and Other Land Loans [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	992,318		1,022,002
Construction, Land Development and Other Land Loans [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	24,698
Construction, Land Development and Other Land Loans [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	486		497
Construction, Land Development and Other Land Loans [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,024		2,308
Construction, Land Development and Other Land Loans [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	521		526
Construction, Land Development and Other Land Loans [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,272	[1]	1,142	[2]
Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,040,845		1,026,475
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	6,525		13,507
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	5,630
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	509,825		528,400
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	14,126
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	6,367		4,265
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	13,630		4,921
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	232		46
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	504	[1]	507	[2]
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	556,839		551,646
1-4 Family Residential (Includes Home Equity) [Member] | Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		[3]		[3],[4]
1-4 Family Residential (Includes Home Equity) [Member] | Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	26,790	[3]		[4]
1-4 Family Residential (Includes Home Equity) [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,467,982	[3]	2,503,679	[3],[4]
1-4 Family Residential (Includes Home Equity) [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	30,536	[3]		[4]
1-4 Family Residential (Includes Home Equity) [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,097	[3]	1,174	[4]
1-4 Family Residential (Includes Home Equity) [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	7,830	[3]	8,266	[4]
1-4 Family Residential (Includes Home Equity) [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,603	[3]	3,136	[4]
1-4 Family Residential (Includes Home Equity) [Member] | Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		[3]		[4]
1-4 Family Residential (Includes Home Equity) [Member] | Grade 9 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		[3]		[4]
1-4 Family Residential (Includes Home Equity) [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	5,844	[1],[3]	5,926	[2],[4]
1-4 Family Residential (Includes Home Equity) [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,542,682	[4],[5]	2,522,181	[4],[5]
Commercial Real Estate (Includes Multi-Family Residential) [Member] | Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	26,052
Commercial Real Estate (Includes Multi-Family Residential) [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,814,735		2,965,455
Commercial Real Estate (Includes Multi-Family Residential) [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	107,547
Commercial Real Estate (Includes Multi-Family Residential) [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	11,914		10,424
Commercial Real Estate (Includes Multi-Family Residential) [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	32,534		25,839
Commercial Real Estate (Includes Multi-Family Residential) [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	6,190		5,155
Commercial Real Estate (Includes Multi-Family Residential) [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	22,684	[1]	23,467	[2]
Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	3,021,656		3,030,340
Commercial and Industrial [Member] | Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	57,718		61,697
Commercial and Industrial [Member] | Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	24,696
Commercial and Industrial [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,438,160		1,698,558
Commercial and Industrial [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	111,401
Commercial and Industrial [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	47,162		3,266
Commercial and Industrial [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	13,943		4,707
Commercial and Industrial [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	10,930		11,834
Commercial and Industrial [Member] | Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	89		105
Commercial and Industrial [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	19,022	[1]	26,100	[2]
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,723,121		1,806,267
Consumer and Other [Member] | Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	42,502		41,240
Consumer and Other [Member] | Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	36,338
Consumer and Other [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	190,968		257,588
Consumer and Other [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,894
Consumer and Other [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	16		18
Consumer and Other [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	7,778		50
Consumer and Other [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	366		8,378
Consumer and Other [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		[1]		[2]
Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	280,862		307,274
Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	106,745		116,444
Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	139,032
Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	8,413,988		8,975,682
Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	291,202
Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	67,042		19,644
Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	77,739		46,091
Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	20,842		29,075
Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	89		105
PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 49,326	[1]	$ 57,142	[2]

[1] Of the total PCI loans, $28.2 million were classifed as substandard at March 31, 2015.

[2] Of the total PCI loans, $32.0 million were classifed as substandard at December 31, 2014.

[3] Includes $10.6 million of residential mortgage loans held for sale at March 31, 2015.

[4] Includes $8.6 million of residential mortgage loans held for sale at December 31, 2014.

[5] Includes $10.6 million and $8.6 million of residential mortgage loans held for sale at March 31, 2015 and December 31, 2014, respectively.

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Note 4 - Securities (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Note 4 - Securities (Details) [Line Items]
Number of Investment Securities Segments	2
Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Securities	(498)		501
Gain (Loss) on Sale of Securities, Net	$ 3	$ 0
Available-for-sale Securities, Amortized Cost Basis	126,450,000		139,662,000
Available-for-sale Securities	131,745,000		145,399,000
Stockholders' Equity, Total [Member] | Securities Concentration Risk [Member]
Note 4 - Securities (Details) [Line Items]
Concentration Risk, Percentage	0.00%	0.00%
Collateralized Securities [Member]
Note 4 - Securities (Details) [Line Items]
Available-for-sale Securities, Amortized Cost Basis	4,990,000,000		5,080,000,000
Available-for-sale Securities	$ 5,040,000,000		$ 5,100,000,000

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Note 4 - Securities (Details) - Investment Securities (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Available for Sale
Available for sale securities, amortized cost	$ 126,450	$ 139,662
Available for sale securities, gross unrealized gains	5,348	5,819
Available for sale securities, gross unrealized losses	(53)	(82)
Available for sale securities, fair value	131,745	145,399
Held to Maturity
Held to maturity securities, amortized cost	9,447,751	8,900,377
Held to maturity securities, gross unrealized gains	132,962	103,372
Held to maturity securities, gross unrealized losses	(44,610)	(55,057)
Held to maturity securities, fair value	9,536,103	8,948,692
US States and Political Subdivisions Debt Securities [Member]
Available for Sale
Available for sale securities, amortized cost	9,205	14,402
Available for sale securities, gross unrealized gains	99	183
Available for sale securities, fair value	9,304	14,585
Held to Maturity
Held to maturity securities, amortized cost	376,080	404,356
Held to maturity securities, gross unrealized gains	6,498	6,147
Held to maturity securities, gross unrealized losses	(1,352)	(1,422)
Held to maturity securities, fair value	381,226	409,081
Collateralized Mortgage Obligations [Member]
Available for Sale
Available for sale securities, amortized cost	31,792	33,519
Available for sale securities, gross unrealized gains	99	91
Available for sale securities, gross unrealized losses	(14)	(37)
Available for sale securities, fair value	31,877	33,573
Held to Maturity
Held to maturity securities, amortized cost	13,826	19,585
Held to maturity securities, gross unrealized gains	124	215
Held to maturity securities, gross unrealized losses	(3)	(8)
Held to maturity securities, fair value	13,947	19,792
Collateralized Mortgage Backed Securities [Member]
Available for Sale
Available for sale securities, amortized cost	72,864	79,153
Available for sale securities, gross unrealized gains	4,846	5,344
Available for sale securities, gross unrealized losses	(13)	(14)
Available for sale securities, fair value	77,697	84,483
Held to Maturity
Held to maturity securities, amortized cost	9,005,452	8,424,083
Held to maturity securities, gross unrealized gains	125,414	96,650
Held to maturity securities, gross unrealized losses	(43,255)	(53,553)
Held to maturity securities, fair value	9,087,611	8,467,180
Other Debt Obligations [Member]
Available for Sale
Available for sale securities, amortized cost	12,589	12,588
Available for sale securities, gross unrealized gains	304	201
Available for sale securities, gross unrealized losses	(26)	(31)
Available for sale securities, fair value	12,867	12,758
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Held to Maturity
Held to maturity securities, amortized cost	52,393	52,353
Held to maturity securities, gross unrealized gains	926	360
Held to maturity securities, gross unrealized losses		(74)
Held to maturity securities, fair value	$ 53,319	$ 52,639

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Consolidated Statements of Cash Flows [Unaudited] (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 73,641	$ 67,137
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and core deposit intangibles amortization	5,405	5,246
Provision for credit losses	1,250	600
Net amortization of premium on investments	14,144	12,279
Loss on sale of other real estate	10	60
Gain on sale of assets	(1,379)	(3,310)
Net accretion of discount on loans	(19,647)	(13,476)
Gain on sale of loans	(1,093)	(543)
Proceeds from sale of loans held for sale	45,327	24,241
Originations of loans held for sale	(46,254)	(25,046)
Stock based compensation expense	2,763	1,171
Decrease in accrued interest receivable and other assets	30,543	8,840
Increase in accrued interest payable and other liabilities	11,856	35,480
Net cash provided by operating activities	116,566	112,679
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities and principal paydowns of held to maturity securities	392,556	314,135
Purchase of held to maturity securities	(954,084)	(677,436)
Proceeds from maturities and principal paydowns of available for sale securities	613,222	263,643
Purchase of available for sale securities	(600,000)	(250,000)
Net decrease in loans held for investment	97,616	34,057
Purchase of bank premises and equipment	(2,733)	(2,478)
Proceeds from sale of bank premises, equipment and other real estate	5,198	5,041
Net cash used in investing activities	(448,225)	(313,038)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in noninterest-bearing deposits	102,016	33,207
Net (decrease) increase in interest-bearing deposits	(233,402)	135,579
Net proceeds from other short-term borrowings	325,000	30,000
Repayments of other long-term borrowings	(1,810)	(238)
Net increase (decrease) in securities sold under repurchase agreements	2,895	(15,283)
Redemption of junior subordinated debentures	(167,531)
Proceeds from stock option exercises		1,839
Payments of cash dividends	(19,082)	(15,893)
Net cash provided by financing activities	8,086	169,211
NET DECREASE IN CASH AND CASH EQUIVALENTS	(323,573)	(31,148)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	677,854	381,390
CASH AND CASH EQUIVALENTS, END OF PERIOD	354,281	350,242
NONCASH ACTIVITIES:
Acquisition of real estate through foreclosure of collateral	766	2,710
SUPPLEMENTAL INFORMATION:
Income taxes paid	2,000	5,000
Interest paid	$ 11,665	$ 10,694

XML

Note 4 - Securities (Details) - Securities in a Continuous Loss Position (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Available for Sale
Available for sale, estimated fair value, less than 12 months	$ 2,028	$ 8,739
Available for sale, unrealized losses, less than 12 months	(26)	(67)
Available for sale, estimated fair value, more than 12 months	8,425	2,882
Available for sale, unrealized losses, more than 12 months	(27)	(15)
Available for sale, estimated fair value, total	10,453	11,621
Available for sale, unrealized losses, total	(53)	(82)
Held to Maturity
Held to maturity, estimated fair value, less than 12 months	804,420	1,212,828
Held to maturity, unrealized losses, less than 12 months	(8,626)	(3,104)
Held to maturity, estimated fair value, more than 12 months	2,209,372	2,394,225
Held to maturity, unrealized losses, more than 12 months	(35,984)	(51,953)
Held to maturity, estimated fair value, total	3,013,792	3,607,053
Held to maturity, unrealized losses, total	(44,610)	(55,057)
Collateralized Mortgage Obligations [Member]
Available for Sale
Available for sale, estimated fair value, less than 12 months		6,675
Available for sale, unrealized losses, less than 12 months		(36)
Available for sale, estimated fair value, more than 12 months	5,709	45
Available for sale, unrealized losses, more than 12 months	(14)	(1)
Available for sale, estimated fair value, total	5,709	6,720
Available for sale, unrealized losses, total	(14)	(37)
Held to Maturity
Held to maturity, estimated fair value, less than 12 months	1,103	670
Held to maturity, unrealized losses, less than 12 months		(5)
Held to maturity, estimated fair value, more than 12 months	309	322
Held to maturity, unrealized losses, more than 12 months	(3)	(3)
Held to maturity, estimated fair value, total	1,412	992
Held to maturity, unrealized losses, total	(3)	(8)
Collateralized Mortgage Backed Securities [Member]
Available for Sale
Available for sale, estimated fair value, less than 12 months	317	358
Available for sale, estimated fair value, more than 12 months	2,716	2,837
Available for sale, unrealized losses, more than 12 months	(13)	(14)
Available for sale, estimated fair value, total	3,033	3,195
Available for sale, unrealized losses, total	(13)	(14)
Held to Maturity
Held to maturity, estimated fair value, less than 12 months	759,408	1,149,380
Held to maturity, unrealized losses, less than 12 months	(8,364)	(2,600)
Held to maturity, estimated fair value, more than 12 months	2,160,554	2,349,143
Held to maturity, unrealized losses, more than 12 months	(34,891)	(50,953)
Held to maturity, estimated fair value, total	2,919,962	3,498,523
Held to maturity, unrealized losses, total	(43,255)	(53,553)
Other Debt Obligations [Member]
Available for Sale
Available for sale, estimated fair value, less than 12 months	1,711	1,706
Available for sale, unrealized losses, less than 12 months	(26)	(31)
Available for sale, estimated fair value, total	1,711	1,706
Available for sale, unrealized losses, total	(26)	(31)
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Held to Maturity
Held to maturity, estimated fair value, less than 12 months		17,098
Held to maturity, unrealized losses, less than 12 months		(74)
Held to maturity, estimated fair value, total		17,098
Held to maturity, unrealized losses, total		(74)
US States and Political Subdivisions Debt Securities [Member]
Held to Maturity
Held to maturity, estimated fair value, less than 12 months	43,909	45,680
Held to maturity, unrealized losses, less than 12 months	(262)	(425)
Held to maturity, estimated fair value, more than 12 months	48,509	44,760
Held to maturity, unrealized losses, more than 12 months	(1,090)	(997)
Held to maturity, estimated fair value, total	92,418	90,440
Held to maturity, unrealized losses, total	$ (1,352)	$ (1,422)

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Note 5 - Loans and Allowance for Credit Losses (Details) - Changes in Accretable Yield for PCI Loans (PCI Loans [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
PCI Loans [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) - Changes in Accretable Yield for PCI Loans [Line Items]
Balance at beginning of period	$ 9,867	$ 7,569
Reclassifications from nonaccretable	7,291	1,503
Accretion	(9,288)	(2,888)
Balance at March 31	$ 7,870	$ 6,184

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Note 8 - Stock Based Compensation (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Note 8 - Stock Based Compensation (Details) [Line Items]
Number of Stock-based Employee Compensation Plans		3
Number of Stock-based Employee Compensation Plans Expired		2
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	$ 0	$ 1,800,000
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	0	0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 28,400,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 18 days
1998 Stock Incentive Plan [Member]
Note 8 - Stock Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)	920,000
2004 Stock Incentive Plan [Member]
Note 8 - Stock Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)	1,250,000
2012 Stock Incentive Plan [Member]
Note 8 - Stock Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)	1,250,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)	284,043

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Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
ASSETS
Cash and due from banks	$ 352,642	$ 677,285
Federal funds sold	1,639	569
Total cash and cash equivalents	354,281	677,854
Available for sale securities, at fair value	131,745	145,399
Held to maturity securities, at cost (fair value of $9,536,103 and $8,948,692, respectively)	9,447,751	8,900,377
Total securities	9,579,496	9,045,776
Loans held for sale	10,622	8,602
Loans held for investment	9,155,383	9,235,581
Total loans	9,166,005	9,244,183
Less: allowance for credit losses	(80,963)	(80,762)
Loans, net	9,085,042	9,163,421
Accrued interest receivable	48,770	51,941
Goodwill	1,881,955	1,874,191
Core deposit intangibles, net	56,458	58,947
Bank premises and equipment, net	276,468	281,549
Other real estate owned	3,010	3,237
Bank owned life insurance (BOLI)	231,439	230,095
Federal Home Loan Bank of Dallas stock	26,989	15,432
Other assets	62,951	105,290
TOTAL ASSETS	21,606,859	21,507,733
Deposits:
Noninterest-bearing	5,038,436	4,936,420
Interest-bearing	12,522,916	12,756,738
Total deposits	17,561,352	17,693,158
Other borrowings	331,914	8,724
Securities sold under repurchase agreements	318,418	315,523
Junior subordinated debentures		167,531
Accrued interest payable	2,225	3,190
Other liabilities	91,089	74,781
Total liabilities	18,304,998	18,262,907
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; 70,060,878 and 69,816,653 shares issued at March 31, 2015 and December 31, 2014, respectively; 70,023,790 and 69,779,565 shares outstanding at March 31, 2015 and December 31, 2014, respectively	70,061	69,817
Capital surplus	2,027,754	2,025,235
Retained earnings	1,201,211	1,146,652
Accumulated other comprehensive income—net unrealized gain on available for sale securities, net of tax of $1,854 and $2,008, respectively	3,442	3,729
Less treasury stock, at cost, 37,088 shares	(607)	(607)
Total shareholders’ equity	3,301,861	3,244,826
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 21,606,859	$ 21,507,733

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Note 5 - Loans and Allowance for Credit Losses (Details) - Activity in Allowance for Loan Losses (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Three Months Ended
Balance January 1	$ 80,762	$ 67,282
Provision for credit losses	1,250	600
Charge-offs	(1,749)	(1,445)
Recoveries	700	659
Net charge-offs	(1,049)	(786)
Balance March 31	80,963	67,096
Allowance for credit losses related to:
Individually evaluated for impairment	3,480	2,131	2,493
Collectively evaluated for impairment	76,071	64,965	78,269
PCI loans	1,412
Total allowance for credit losses	80,963	67,096
Recorded investment in loans:
Individually evaluated for impairment	20,931	6,613	29,180
Collectively evaluated for impairment	9,085,126	7,702,583	9,149,259
PCI loans	49,326	39,646	57,142
Total loans evaluated for impairment	9,155,383	7,748,842	9,235,581
Construction, Land Development and Other Land Loans [Member]
Three Months Ended
Balance January 1	15,825	14,353
Provision for credit losses	1,178	(770)
Charge-offs	(151)	(2)
Recoveries	6	19
Net charge-offs	(145)	17
Balance March 31	16,858	13,600
Allowance for credit losses related to:
Individually evaluated for impairment	221		225
Collectively evaluated for impairment	16,637	13,600	15,600
Total allowance for credit losses	16,858	13,600
Recorded investment in loans:
Individually evaluated for impairment	521	324	526
Collectively evaluated for impairment	1,039,052	885,267	1,024,807
PCI loans	1,272	3,394	1,142
Total loans evaluated for impairment	1,040,845	888,985	1,026,475
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Three Months Ended
Balance January 1	3,722	1,229
Provision for credit losses	(523)	46
Charge-offs		(14)
Recoveries	78	95
Net charge-offs	78	81
Balance March 31	3,277	1,356
Allowance for credit losses related to:
Individually evaluated for impairment	21	48	24
Collectively evaluated for impairment	3,256	1,308	3,698
Total allowance for credit losses	3,277	1,356
Recorded investment in loans:
Individually evaluated for impairment	232	207	46
Collectively evaluated for impairment	556,103	512,058	551,093
PCI loans	504	592	507
Total loans evaluated for impairment	556,839	512,857	551,646
1-4 Family Residential (Includes Home Equity) [Member]
Three Months Ended
Balance January 1	16,377	17,046
Provision for credit losses	487	1,804
Charge-offs	(98)	(139)
Recoveries	12	7
Net charge-offs	(86)	(132)
Balance March 31	16,778	18,718
Allowance for credit losses related to:
Individually evaluated for impairment	242	767	418
Collectively evaluated for impairment	16,536	17,951	15,959
Total allowance for credit losses	16,778	18,718
Recorded investment in loans:
Individually evaluated for impairment	2,603	2,949	3,136
Collectively evaluated for impairment	2,523,613	2,159,996	2,504,517
PCI loans	5,844	3,943	5,926
Total loans evaluated for impairment	2,532,060	2,166,888	2,513,579
Commercial Real Estate (Includes Multi-Family Residential) [Member]
Three Months Ended
Balance January 1	12,744	24,835
Provision for credit losses	(173)	(1,404)
Charge-offs	(43)	(102)
Recoveries	10	42
Net charge-offs	(33)	(60)
Balance March 31	12,538	23,371
Allowance for credit losses related to:
Individually evaluated for impairment	507	7	24
Collectively evaluated for impairment	12,031	23,364	12,720
Total allowance for credit losses	12,538	23,371
Recorded investment in loans:
Individually evaluated for impairment	6,190	1,422	5,155
Collectively evaluated for impairment	2,992,782	2,681,641	3,001,718
PCI loans	22,684	26,323	23,467
Total loans evaluated for impairment	3,021,656	2,709,386	3,030,340
Commercial and Industrial [Member]
Three Months Ended
Balance January 1	30,002	8,167
Provision for credit losses	586	567
Charge-offs	(728)	(143)
Recoveries	224	62
Net charge-offs	(504)	(81)
Balance March 31	30,084	8,653
Allowance for credit losses related to:
Individually evaluated for impairment	2,396	1,217	1,597
Collectively evaluated for impairment	26,276	7,436	28,405
PCI loans	1,412
Total allowance for credit losses	30,084	8,653
Recorded investment in loans:
Individually evaluated for impairment	11,019	1,562	11,939
Collectively evaluated for impairment	1,693,080	1,248,064	1,768,228
PCI loans	19,022	5,394	26,100
Total loans evaluated for impairment	1,723,121	1,255,020	1,806,267
Consumer and Other [Member]
Three Months Ended
Balance January 1	2,092	1,652
Provision for credit losses	(305)	357
Charge-offs	(729)	(1,045)
Recoveries	370	434
Net charge-offs	(359)	(611)
Balance March 31	1,428	1,398
Allowance for credit losses related to:
Individually evaluated for impairment	93	92	205
Collectively evaluated for impairment	1,335	1,306	1,887
Total allowance for credit losses	1,428	1,398
Recorded investment in loans:
Individually evaluated for impairment	366	149	8,378
Collectively evaluated for impairment	280,496	215,557	298,896
Total loans evaluated for impairment	$ 280,862	$ 215,706	$ 307,274

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Consolidated Statements of Changes in Shareholders' Equity [Unaudited] (USD $) In Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2013	$ 66,085	$ 1,798,862	$ 917,595	$ 4,883	$ (607)	$ 2,786,818
Balance (in Shares) at Dec. 31, 2013	66,085,179
Net income			67,137			67,137
Other comprehensive loss				(318)		(318)
Common stock issued in connection with the exercise of stock options and restricted stock awards	213	1,626				1,839
Common stock issued in connection with the exercise of stock options and restricted stock awards (in Shares)	212,997
Stock based compensation expense		1,171				1,171
Cash dividends declared			(15,893)			(15,893)
Balance at Mar. 31, 2014	66,298	1,801,659	968,839	4,565	(607)	2,840,754
Balance (in Shares) at Mar. 31, 2014	66,298,176
Balance at Dec. 31, 2014	69,817	2,025,235	1,146,652	3,729	(607)	3,244,826
Balance (in Shares) at Dec. 31, 2014	69,816,653
Net income			73,641			73,641
Other comprehensive loss				(287)		(287)
Common stock issued in connection with the exercise of stock options and restricted stock awards	244	(244)
Common stock issued in connection with the exercise of stock options and restricted stock awards (in Shares)	244,225
Stock based compensation expense		2,763				2,763
Cash dividends declared			(19,082)			(19,082)
Balance at Mar. 31, 2015	$ 70,061	$ 2,027,754	$ 1,201,211	$ 3,442	$ (607)	$ 3,301,861
Balance (in Shares) at Mar. 31, 2015	70,060,878

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Note 11 - Acquisitions (Details) (USD $)	3 Months Ended	12 Months Ended	0 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Apr. 02, 2014	Dec. 31, 2013
Note 11 - Acquisitions (Details) [Line Items]
Goodwill	$ 1,881,955,000	$ 1,874,191,000		$ 1,671,520,000
Goodwill, Purchase Accounting Adjustments	7,764,000	4,426,000
FM Bancorporation [Member] | Tulsa, Oklahoma [Member]
Note 11 - Acquisitions (Details) [Line Items]
Number of Operating Banking Offices			9
FM Bancorporation [Member] | Dallas, Texas [Member]
Note 11 - Acquisitions (Details) [Line Items]
Number of Operating Banking Offices			3
FM Bancorporation [Member] | Oklahoma City, Oklahoma [Member]
Note 11 - Acquisitions (Details) [Line Items]
Number of Operating Banking Offices			1
FM Bancorporation [Member]
Note 11 - Acquisitions (Details) [Line Items]
Number of Operating Banking Offices			13
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities			1,600,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits			2,270,000,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares)			3,298,022
Payments to Acquire Businesses, Gross			34,200,000
Business Combination, Consideration Transferred			252,400,000
Business Acquisition, Share Price (in Dollars per share)			$ 66.15
Goodwill	206,000,000	198,200,000
Goodwill, Purchase Accounting Adjustments	7,800,000
Finite-lived Intangible Assets Acquired	$ 27,100,000	$ 27,140,000

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Note 5 - Loans and Allowance for Credit Losses (Details) - Types of Loans in Loan Portfolio (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential mortgage loans held for sale	$ 10,622		$ 8,602
Loans held for investment	9,155,383		9,235,581		7,748,842
Total	9,166,005		9,244,183
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential mortgage loans held for sale	10,622		8,602
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,723,121		1,806,267		1,255,020
Total	1,723,121		1,806,267
Construction, Land Development and Other Land Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,040,845		1,026,475		888,985
Total	1,040,845		1,026,475
1-4 Family Residential (Includes Home Equity) [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,532,060		2,513,579		2,166,888
Total	2,542,682	[1],[2]	2,522,181	[1],[2]
Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,021,656		3,030,340		2,709,386
Total	3,021,656		3,030,340
Farmland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	380,303		361,943
Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	176,536		189,703
Consumer and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	280,862		307,274		215,706
Total	$ 280,862		$ 307,274

[1] Includes $10.6 million and $8.6 million of residential mortgage loans held for sale at March 31, 2015 and December 31, 2014, respectively.

[2] Includes $8.6 million of residential mortgage loans held for sale at December 31, 2014.

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Note 4 - Securities (Tables)

3 Months Ended

Mar. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Marketable Securities [Table Text Block]

	March 31, 2015
			Gross		Gross
	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value
	(Dollars in thousands)
Available for Sale
States and political subdivisions	$	9,205	$	99	$	-		$	9,304
Collateralized mortgage obligations		31,792		99		(14	)		31,877
Mortgage-backed securities		72,864		4,846		(13	)		77,697
Other securities		12,589		304		(26	)		12,867
Total	$	126,450	$	5,348	$	(53	)	$	131,745
Held to Maturity
U.S. Treasury securities and obligations of U.S. Government agencies	$	52,393	$	926	$	-		$	53,319
States and political subdivisions		376,080		6,498		(1,352	)		381,226
Collateralized mortgage obligations		13,826		124		(3	)		13,947
Mortgage-backed securities		9,005,452		125,414		(43,255	)		9,087,611
Total	$	9,447,751	$	132,962	$	(44,610	)	$	9,536,103

	December 31, 2014
			Gross		Gross
	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value
	(Dollars in thousands)
Available for Sale
States and political subdivisions	$	14,402	$	183	$	-		$	14,585
Collateralized mortgage obligations		33,519		91		(37	)		33,573
Mortgage-backed securities		79,153		5,344		(14	)		84,483
Other securities		12,588		201		(31	)		12,758
Total	$	139,662	$	5,819	$	(82	)	$	145,399
Held to Maturity
U.S. Treasury securities and obligations of U.S. Government agencies	$	52,353	$	360	$	(74	)	$	52,639
States and political subdivisions		404,356		6,147		(1,422	)		409,081
Collateralized mortgage obligations		19,585		215		(8	)		19,792
Mortgage-backed securities		8,424,083		96,650		(53,553	)		8,467,180
Total	$	8,900,377	$	103,372	$	(55,057	)	$	8,948,692

Schedule of Unrealized Loss on Investments [Table Text Block]

	March 31, 2015
	Less than 12 Months					More than 12 Months					Total
	Estimated		Unrealized			Estimated		Unrealized			Estimated		Unrealized
	Fair Value		Losses			Fair Value		Losses			Fair Value		Losses
	(Dollars in thousands)
Available for Sale
Collateralized mortgage obligations	$	-	$	-		$	5,709	$	(14	)	$	5,709	$	(14	)
Mortgage-backed securities		317		-			2,716		(13	)		3,033		(13	)
Other securities		1,711		(26	)		-		-			1,711		(26	)
Total	$	2,028	$	(26	)	$	8,425	$	(27	)	$	10,453	$	(53	)
Held to Maturity
U.S. Treasury securities and obligations of U.S. Government agencies	$	-	$	-		$	-	$	-		$	-	$	-
States and political subdivisions		43,909		(262	)		48,509		(1,090	)		92,418		(1,352	)
Collateralized mortgage obligations		1,103		-			309		(3	)		1,412		(3	)
Mortgage-backed securities		759,408		(8,364	)		2,160,554		(34,891	)		2,919,962		(43,255	)
Total	$	804,420	$	(8,626	)	$	2,209,372	$	(35,984	)	$	3,013,792	$	(44,610	)

	December 31, 2014
	Less than 12 Months					More than 12 Months					Total
	Estimated		Unrealized			Estimated		Unrealized			Estimated		Unrealized
	Fair Value		Losses			Fair Value		Losses			Fair Value		Losses
	(Dollars in thousands)
Available for Sale
Collateralized mortgage obligations	$	6,675	$	(36	)	$	45	$	(1	)	$	6,720	$	(37	)
Mortgage-backed securities		358		-			2,837		(14	)		3,195		(14	)
Other securities		1,706		(31	)		-		-			1,706		(31	)
Total	$	8,739	$	(67	)	$	2,882	$	(15	)	$	11,621	$	(82	)
Held to Maturity
U.S. Treasury securities and obligations of U.S. Government agencies	$	17,098	$	(74	)	$	-	$	-		$	17,098	$	(74	)
States and political subdivisions		45,680		(425	)		44,760		(997	)		90,440		(1,422	)
Collateralized mortgage obligations		670		(5	)		322		(3	)		992		(8	)
Mortgage-backed securities		1,149,380		(2,600	)		2,349,143		(50,953	)		3,498,523		(53,553	)
Total	$	1,212,828	$	(3,104	)	$	2,394,225	$	(51,953	)	$	3,607,053	$	(55,057	)

Investments Classified by Contractual Maturity Date [Table Text Block]

	Held to Maturity				Available for Sale
	Amortized		Fair			Amortized	Fair
	Cost		Value			Cost	Value
	(Dollars in thousands)
Due in one year or less	$	35,021	$	35,145	$	12,689	$	12,969
Due after one year through five years		176,412		178,087		4,616		4,658
Due after five years through ten years		163,600		167,669		3,859		3,907
Due after ten years		53,440		53,644		630		637
Subtotal		428,473		434,545		21,794		22,171
Mortgage-backed securities and collateralized mortgage obligations		9,019,278		9,101,558		104,656		109,574
Total	$	9,447,751	$	9,536,103	$	126,450	$	131,745

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Note 5 - Loans and Allowance for Credit Losses (Details) - Related Party Loans (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Related Party Loans [Abstract]
Beginning balance on January 1	$ 4,940	$ 6,187
New loans and reclassified related loans	174	4,943
Repayments	(76)	(6,190)
Ending balance	$ 5,038	$ 4,940

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Note 6 - Fair Value (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	As of March 31, 2015
	Level 1		Level 2			Level 3		Total
	(Dollars in thousands)
Assets:
Available for sale securities:
States and political subdivisions	$	-	$	9,304		$	-	$	9,304
Collateralized mortgage obligations		-		31,877			-		31,877
Mortgage-backed securities		-		77,697			-		77,697
Other securities		12,867		-			-		12,867
Total	$	12,867	$	118,878		$	-	$	131,745
Non-hedging interest rate swap	$	-	$	450		$	-	$	450
Liabilities:
Non-hedging interest rate swap	$	-	$	(450	)	$	-	$	(450	)

	As of December 31, 2014
	Level 1		Level 2			Level 3		Total
	(Dollars in thousands)
Assets:
Available for sale securities:
States and political subdivisions	$	-	$	14,585		$	-	$	14,585
Collateralized mortgage obligations		-		33,573			-		33,573
Mortgage-backed securities		-		84,483			-		84,483
Other securities		12,758		-			-		12,758
Total	$	12,758	$	132,641		$	-	$	145,399
Non-hedging interest rate swap	$	-	$	303		$	-	$	303
Liabilities:
Non-hedging interest rate swap	$	-	$	(303	)	$	-	$	(303	)

Fair Value Measurements, Nonrecurring [Table Text Block]

	As of March 31, 2015
	Carrying		Estimated Fair Value
	Amount		Level 1		Level 2		Level 3		Total
	(Dollars in thousands)
Assets
Cash and due from banks	$	352,642	$	352,642	$	-	$	-	$	352,642
Federal funds sold		1,639		1,639		-		-		1,639
Held to maturity securities		9,447,751		-		9,536,103		-		9,536,103
Loans held for sale		10,622		-		10,622		-		10,622
Loans held for investment, net of allowance		9,074,420		-		-		9,154,675		9,154,675
Other real estate owned		3,010		-		3,010		-		3,010
Liabilities
Deposits:
Noninterest-bearing	$	5,038,436	$	-	$	5,038,436	$	-	$	5,038,436
Interest-bearing		12,522,916		-		12,531,588		-		12,531,588
Other borrowings		331,914		-		332,804		-		332,804
Securities sold under repurchase agreements		318,418		-		318,434		-		318,434
Junior subordinated debentures		-		-		-		-		-

	As of December 31, 2014
	Carrying		Estimated Fair Value
	Amount		Level 1		Level 2		Level 3		Total
	(Dollars in thousands)
Assets
Cash and due from banks	$	677,285	$	677,285	$	-	$	-	$	677,285
Federal funds sold		569		569		-		-		569
Held to maturity securities		8,900,377		-		8,948,692		-		8,948,692
Loans held for sale		8,602		-		8,602		-		8,602
Loans held for investment, net of allowance		9,154,819		-		-		9,192,231		9,192,231
Other real estate owned		3,237		-		3,237		-		3,237
Liabilities
Deposits:
Noninterest-bearing	$	4,936,420	$	-	$	4,936,420	$	-	$	4,936,420
Interest-bearing		12,756,738		-		12,767,961		-		12,767,961
Other borrowings		8,724		-		10,000		-		10,000
Securities sold under repurchase agreements		315,523		-		315,543		-		315,543
Junior subordinated debentures		167,531		-		159,740		-		159,740

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Consolidated Statements of Changes in Shareholders' Equity [Unaudited] (Parentheticals) (Common Stock [Member], USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Common Stock [Member]
Cash dividends declared, per share	$ 0.2725	$ 0.2400

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Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Held to maturity securities, fair value (in Dollars)	$ 9,536,103	$ 8,948,692
Preferred stock, par value (in Dollars per share)	$ 1	$ 1
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in Dollars per share)	$ 1	$ 1
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	70,060,878	69,816,653
Common stock, shares outstanding	70,023,790	69,779,565
Accumulated other comprehensive income—net unrealized gain on available for sale securities, tax (in Dollars)	$ 1,854	$ 2,008
Treasury stock, shares	37,088	37,088

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Note 9 - Contractual Obigations and Off-Balance Sheet Items

3 Months Ended

Mar. 31, 2015

Table Text Block [Abstract]

Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]

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 March 31, 2015 (other than deposit obligations and securities sold under repurchase agreements). The Company’s future cash payments associated with its contractual obligations pursuant to its FHLB borrowings and operating leases as of March 31, 2015 are summarized below. Payments for FHLB borrowings include interest of $1.3 million that will be paid over the future periods. Payments related to leases are based on actual payments specified in underlying contracts.

			More than 1		3 years or
			year but less		more but less		5 years
	1 year or less		than 3 years		than 5 years		or more		Total
	(Dollars in thousands)
Federal Home Loan Bank notes payable	$	326,062	$	1,803	$	4,648	$	722	$	333,235
Operating leases		6,633		9,066		4,205		7,693		27,597
Total	$	332,695	$	10,869	$	8,853	$	8,415	$	360,832

Off-Balance Sheet Items

In the normal course of business, the Company enters into various transactions, which, in accordance with accounting principles generally accepted in the United States, 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 periods as of March 31, 2015 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.

			More than 1		3 years or
			year but less		more but less		5 years
	1 year or less		than 3 years		than 5 years		or more		Total
	(Dollars in thousands)
Standby letters of credit	$	80,087	$	17,273	$	1,086	$	-	$	98,446
Commitments to extend credit		867,449		601,245		56,277		390,714		1,915,685
Total	$	947,536	$	618,518	$	57,363	$	390,714	$	2,014,131

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Document And Entity Information	3 Months Ended
	Mar. 31, 2015	May 04, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	PROSPERITY BANCSHARES INC
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		70,044,190
Amendment Flag	false
Entity Central Index Key	0001068851
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Document Period End Date	Mar. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1

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Note 10 - Other Comprehensive (Loss) Income

3 Months Ended

Mar. 31, 2015

Disclosure Text Block [Abstract]

Comprehensive Income (Loss) Note [Text Block]

10. OTHER COMPREHENSIVE (LOSS) INCOME

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

	Three Months Ended March 31,
	2015								2014
	Before Tax Amount			Tax Benefit		Net of Tax Amount			Before Tax Amount			Tax Benefit		Net of Tax Amount
	(Dollars in thousands)
Other comprehensive loss:
Securities available for sale:
Change in unrealized gain uring period	$	(442	)	$	155	$	(287	)	$	(489	)	$	171	$	(318	)
Total securities available for sale		(442	)		155		(287	)		(489	)		171		(318	)
Total other comprehensive loss	$	(442	)	$	155	$	(287	)	$	(489	)	$	171	$	(318	)

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, 2015	$	3,729		$	3,729
Other comprehensive loss		(287	)		(287	)
Balance at March 31, 2015	$	3,442		$	3,442
Balance at January 1, 2014	$	4,883		$	4,883
Other comprehensive loss		(318	)		(318	)
Balance at March 31, 2014	$	4,565		$	4,565

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Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
INTEREST INCOME:
Loans, including fees	$ 124,878	$ 107,144
Securities	48,562	47,056
Federal funds sold	165	48
Total interest income	173,605	154,248
INTEREST EXPENSE:
Deposits	9,577	9,387
Other borrowings	129	158
Securities sold under repurchase agreements	203	237
Junior subordinated debentures	791	775
Total interest expense	10,700	10,557
NET INTEREST INCOME	162,905	143,691
PROVISION FOR CREDIT LOSSES	1,250	600
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	161,655	143,091
NONINTEREST INCOME:
Nonsufficient funds (NSF) fees	7,918	8,870
Credit card, debit card and ATM card income	5,638	5,152
Service charges on deposit accounts	4,179	3,609
Trust income	2,009	1,800
Mortgage income	1,148	593
Brokerage income	1,409	1,269
Net gain on sale of assets	1,379	3,310
Other	4,741	4,061
Total noninterest income	28,421	28,664
NONINTEREST EXPENSE:
Salaries and employee benefits	49,966	43,408
Net occupancy and equipment	5,964	5,339
Credit and debit card, data processing and software amortization	3,817	3,184
Regulatory assessments and FDIC insurance	4,354	2,726
Core deposit intangibles amortization	2,489	2,045
Depreciation	2,916	3,201
Communications	2,809	2,737
Other real estate expense	132	396
Other	7,015	8,058
Total noninterest expense	79,462	71,094
INCOME BEFORE INCOME TAXES	110,614	100,661
PROVISION FOR INCOME TAXES	36,973	33,524
NET INCOME	$ 73,641	$ 67,137
EARNINGS PER SHARE:
Basic (in Dollars per share)	$ 1.05	$ 1.01
Diluted (in Dollars per share)	$ 1.05	$ 1.01

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Note 4 - Securities

3 Months Ended

Mar. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]

4. SECURITIES

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

	March 31, 2015
			Gross		Gross
	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value
	(Dollars in thousands)
Available for Sale
States and political subdivisions	$	9,205	$	99	$	-		$	9,304
Collateralized mortgage obligations		31,792		99		(14	)		31,877
Mortgage-backed securities		72,864		4,846		(13	)		77,697
Other securities		12,589		304		(26	)		12,867
Total	$	126,450	$	5,348	$	(53	)	$	131,745
Held to Maturity
U.S. Treasury securities and obligations of U.S. Government agencies	$	52,393	$	926	$	-		$	53,319
States and political subdivisions		376,080		6,498		(1,352	)		381,226
Collateralized mortgage obligations		13,826		124		(3	)		13,947
Mortgage-backed securities		9,005,452		125,414		(43,255	)		9,087,611
Total	$	9,447,751	$	132,962	$	(44,610	)	$	9,536,103

	December 31, 2014
			Gross		Gross
	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value
	(Dollars in thousands)
Available for Sale
States and political subdivisions	$	14,402	$	183	$	-		$	14,585
Collateralized mortgage obligations		33,519		91		(37	)		33,573
Mortgage-backed securities		79,153		5,344		(14	)		84,483
Other securities		12,588		201		(31	)		12,758
Total	$	139,662	$	5,819	$	(82	)	$	145,399
Held to Maturity
U.S. Treasury securities and obligations of U.S. Government agencies	$	52,353	$	360	$	(74	)	$	52,639
States and political subdivisions		404,356		6,147		(1,422	)		409,081
Collateralized mortgage obligations		19,585		215		(8	)		19,792
Mortgage-backed securities		8,424,083		96,650		(53,553	)		8,467,180
Total	$	8,900,377	$	103,372	$	(55,057	)	$	8,948,692

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.”

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.

When OTTI occurs, the amount of the other-than-temporary impairment 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 shall 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 shall 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 shall become the new amortized cost basis of the investment.

As of March 31, 2015, management does not have the intent to sell any of its securities and believes that it is more likely than not that the Company will not have to sell any such 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 March 31, 2015, management believes any impairment in the Company’s securities is temporary and no impairment loss has been realized in the Company’s consolidated statements of income.

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

	March 31, 2015
	Less than 12 Months					More than 12 Months					Total
	Estimated		Unrealized			Estimated		Unrealized			Estimated		Unrealized
	Fair Value		Losses			Fair Value		Losses			Fair Value		Losses
	(Dollars in thousands)
Available for Sale
Collateralized mortgage obligations	$	-	$	-		$	5,709	$	(14	)	$	5,709	$	(14	)
Mortgage-backed securities		317		-			2,716		(13	)		3,033		(13	)
Other securities		1,711		(26	)		-		-			1,711		(26	)
Total	$	2,028	$	(26	)	$	8,425	$	(27	)	$	10,453	$	(53	)
Held to Maturity
U.S. Treasury securities and obligations of U.S. Government agencies	$	-	$	-		$	-	$	-		$	-	$	-
States and political subdivisions		43,909		(262	)		48,509		(1,090	)		92,418		(1,352	)
Collateralized mortgage obligations		1,103		-			309		(3	)		1,412		(3	)
Mortgage-backed securities		759,408		(8,364	)		2,160,554		(34,891	)		2,919,962		(43,255	)
Total	$	804,420	$	(8,626	)	$	2,209,372	$	(35,984	)	$	3,013,792	$	(44,610	)

	December 31, 2014
	Less than 12 Months					More than 12 Months					Total
	Estimated		Unrealized			Estimated		Unrealized			Estimated		Unrealized
	Fair Value		Losses			Fair Value		Losses			Fair Value		Losses
	(Dollars in thousands)
Available for Sale
Collateralized mortgage obligations	$	6,675	$	(36	)	$	45	$	(1	)	$	6,720	$	(37	)
Mortgage-backed securities		358		-			2,837		(14	)		3,195		(14	)
Other securities		1,706		(31	)		-		-			1,706		(31	)
Total	$	8,739	$	(67	)	$	2,882	$	(15	)	$	11,621	$	(82	)
Held to Maturity
U.S. Treasury securities and obligations of U.S. Government agencies	$	17,098	$	(74	)	$	-	$	-		$	17,098	$	(74	)
States and political subdivisions		45,680		(425	)		44,760		(997	)		90,440		(1,422	)
Collateralized mortgage obligations		670		(5	)		322		(3	)		992		(8	)
Mortgage-backed securities		1,149,380		(2,600	)		2,349,143		(50,953	)		3,498,523		(53,553	)
Total	$	1,212,828	$	(3,104	)	$	2,394,225	$	(51,953	)	$	3,607,053	$	(55,057	)

At March 31, 2015 and December 31, 2014, there were 498 securities and 501 securities, respectively, in an unrealized loss position for more than 12 months.

The amortized cost and fair value of investment securities at March 31, 2015, 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		Fair			Amortized	Fair
	Cost		Value			Cost	Value
	(Dollars in thousands)
Due in one year or less	$	35,021	$	35,145	$	12,689	$	12,969
Due after one year through five years		176,412		178,087		4,616		4,658
Due after five years through ten years		163,600		167,669		3,859		3,907
Due after ten years		53,440		53,644		630		637
Subtotal		428,473		434,545		21,794		22,171
Mortgage-backed securities and collateralized mortgage obligations		9,019,278		9,101,558		104,656		109,574
Total	$	9,447,751	$	9,536,103	$	126,450	$	131,745

The Company recorded no gain or loss on sale of securities for the three months ended March 31, 2015 and 2014. As of March 31, 2015, the Company did not own any non-agency collateralized mortgage obligations.

At March 31, 2015 and December 31, 2014, 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 $4.99 billion and $5.08 billion and a fair value of $5.04 billion and $5.10 billion at March 31, 2015 and December 31, 2014, respectively, were pledged to collateralize public deposits and for other purposes required or permitted by law.

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Note 3 - New Accounting Standards

3 Months Ended

Mar. 31, 2015

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

New Accounting Pronouncements and Changes in Accounting Principles [Text Block]

3. NEW ACCOUNTING STANDARDS

Accounting Standards Updates (“ASU”)

ASU 2015-01, “Income Statement - Extraordinary and Unusual Items (Subtopic 225-20) – Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items.” ASU 2015-01 eliminates from U.S. GAAP the concept of extraordinary items, which, among other things, required an entity to segregate extraordinary items considered to be unusual and infrequent from the results of ordinary operations and show the item separately in the income statement, net of tax, after income from continuing operations. ASU 2015-01 is effective for the Company beginning January 1, 2016, though early adoption is permitted. ASU 2015-01 is not expected to have a significant impact on the Company’s financial statements.

ASU 2014-12 “Compensation-Stock Compensation (Topic 718) - Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period.”  ASU 2014-12 requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. The performance target should not be reflected in estimating the grant-date fair value of the award. Compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the period(s) for which the requisite service has already been rendered. If the performance target becomes probable of being achieved before the end of the requisite service period, the remaining unrecognized compensation cost should be recognized prospectively over the remaining requisite service period. The total amount of compensation cost recognized during and after the requisite service period should reflect the number of awards that are expected to vest and should be adjusted to reflect those awards that ultimately vest. The requisite service period ends when the employee can cease rendering service and still be eligible to vest in the award if the performance target is achieved. ASU 2014-12 is effective for the Company beginning January 1, 2016 and is not expected to have a significant impact on the Company’s financial statements. 

ASU 2014-11 “Transfers and Servicing (Topic 860) - Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosure.”  ASU 2014-11 changes the accounting for repurchase-to-maturity transactions to secured borrowing accounting. It also requires separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting and disclosure for the repurchase agreement. ASU 2014-11 became effective for the Company on January 1, 2015 and did not have a significant impact on the Company’s financial statements. 

ASU 2014-09 “Revenue from Contract 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.  Additionally, ASU 2014-09  supersedes some cost guidance included in Revenue Recognition—Construction-Type and Production-Type Contracts (Subtopic 605-35).  In addition, the existing requirements for the recognition of a gain or loss on the transfer of nonfinancial assets that are not in a contract with a customer are amended to be consistent with the guidance on recognition and measurement.   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.  ASU 2014-09 is effective for the Company beginning January 1, 2018, with retrospective application to each prior reporting period presented, and the Company is currently evaluating the requirements and it is not expected to have a significant impact on the Company’s financial statements. 

ASU 2014-04 “Receivables—Troubled Debt Restructurings by Creditors (Subtopic 310-40) — Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure.” ASU 2014-04 intends to reduce diversity by clarifying when an in substance repossession or foreclosure occurs, that is, when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan receivable should be derecognized and the real estate property recognized. ASU 2014-04 became effective for the Company on January 1, 2015 and did not have a significant impact on the Company’s financial statements.

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Note 5 - Loans and Allowance for Credit Losses (Tables)

3 Months Ended

Mar. 31, 2015

Loans And Allowance For Credit Losses [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

	March 31,		December 31,
	2015		2014
	(Dollars in thousands)
Residential mortgage loans held for sale	$	10,622	$	8,602
Commercial and industrial		1,723,121		1,806,267
Real estate:
Construction, land development and other land loans		1,040,845		1,026,475
1-4 family residential (including home equity)		2,532,060		2,513,579
Commercial real estate (including multi-family residential)		3,021,656		3,030,340
Farmland		380,303		361,943
Agriculture		176,536		189,703
Consumer and other		280,862		307,274
Total loans held for investment		9,155,383		9,235,581
Total	$	9,166,005	$	9,244,183

Schedule of Related Party Loans [Table Text Block]

	March 31,			December 31,
	2015			2014
	(Dollars in thousands)
Beginning balance on January 1	$	4,940		$	6,187
New loans and reclassified related loans		174			4,943
Repayments		(76	)		(6,190	)
Ending balance	$	5,038		$	4,940

Past Due Financing Receivables [Table Text Block]

	March 31, 2015
	Loans Past Due and Still Accruing
			90 or More		Total Past		Nonaccrual		Current		Total
	30-89 Days		Days		Due Loans		Loans		Loans		Loans
	(Dollars in thousands)
Construction, land development and other land loans other land loans	$	6,239	$	2,128	$	8,367	$	651	$	1,031,827	$	1,040,845
Agriculture and agriculture real estate (includes farmland)		1,811		-		1,811		280		554,748		556,839
1-4 family (includes home equity) (1)		3,607		38		3,645		3,003		2,536,034		2,542,682
Commercial real estate (includes multi-family residential)		10,839		671		11,510		8,373		3,001,773		3,021,656
Commercial and industrial		16,931		131		17,062		16,566		1,689,493		1,723,121
Consumer and other		1,523		-		1,523		379		278,960		280,862
Total	$	40,950	$	2,968	$	43,918	$	29,252	$	9,092,835	$	9,166,005

	December 31, 2014
	Loans Past Due and Still Accruing
			90 or More		Total Past		Nonaccrual		Current		Total
	30-89 Days		Days		Due Loans		Loans		Loans		Loans
	(Dollars in thousands)
Construction, land development and other land loans	$	7,667	$	-	$	7,667	$	526	$	1,018,282	$	1,026,475
Agriculture and agriculture real estate (includes farmland)		2,995		377		3,372		96		548,178		551,646
1-4 family (includes home equity) (1)		2,261		82		2,343		3,570		2,516,268		2,522,181
Commercial real estate (includes multi-family residential)		12,679		65		12,744		6,340		3,011,256		3,030,340
Commercial and industrial		18,305		869		19,174		20,537		1,766,556		1,806,267
Consumer and other		612		800		1,412		353		305,509		307,274
Total	$	44,519	$	2,193	$	46,712	$	31,422	$	9,166,049	$	9,244,183

Schedule of Nonperforming Assets [Table Text Block]

	March 31,			December 31,
	2015			2014
	(Dollars in thousands)
Nonaccrual loans (1)	$	29,252		$	31,422
Accruing loans 90 or more days past due		2,968			2,193
Total nonperforming loans		32,220			33,615
Repossessed assets		146			67
Other real estate		3,010			3,237
Total nonperforming assets	$	35,376		$	36,919
Nonperforming assets to total loans and other real estate		0.39	%		0.40	%

Carrying Value and Outstanding Balance for Purchased Credit Impaired Loans [Table Text Block]

	March 31,		December 31,
	2015		2014
	(Dollars in thousands)
PCI loans:
Outstanding balance	$	100,973	$	129,412
Less: discount		51,647		72,270
Recorded investment	$	49,326	$	57,142

Summary of Changes in Accretable Yields of Acquired Loans [Table Text Block]

	Three Months Ended March 31,
	2015			2014
	(Dollars in thousands)
Balance at beginning of period	$	9,867		$	7,569
Additions		-			-
Reclassifications from nonaccretable		7,291			1,503
Accretion		(9,288	)		(2,888	)
Balance at March 31	$	7,870		$	6,184

Carrying Value and Outstanding Balance for Non Purchased Credit Impaired Loans [Table Text Block]

	March 31,		December 31,
	2015		2014
	(Dollars in thousands)
Non-PCI loans:
Outstanding balance	$	1,939,609	$	2,186,111
Less: discount		78,289		89,105
Recorded investment	$	1,861,320	$	2,097,006

Summary of Changes in Accretable Yields of Acquired Non PCI Loans[TableText Block]

	Three Months Ended March 31,
	2015			2014
	(Dollars in thousands)
Balance at beginning of period	$	89,105		$	87,798
Accretion charge-offs		(457	)		(48	)
Accretion		(10,359	)		(10,587	)
Balance at March 31	$	78,289		$	77,163

Impaired Financing Receivables [Table Text Block]

	March 31, 2015
			Unpaid				Average
	Recorded		Principal		Related		Recorded
	Investment		Balance		Allowance		Investment
	(Dollars in thousands)
With no related allowance recorded:
Construction, land development and other land loans	$	245	$	251	$	-	$	251
Agriculture and agriculture real estate (includes farmland)		190		190		-		95
1-4 family (includes home equity)		1,415		1,532		-		1,621
Commercial real estate (includes multi-family residential)		5,392		5,426		-		5,260
Commercial and industrial		4,003		4,194		-		6,839
Consumer and other		141		161		-		4,152
Total		11,386		11,754		-		18,218
With an allowance recorded:
Construction, land development and other land loans		276		276		221		276
Agriculture and agriculture real estate (includes farmland)		42		52		21		49
1-4 family (includes home equity)		1,188		1,254		242		1,340
Commercial real estate (includes multi-family residential)		798		2,394		507		1,228
Commercial and industrial		7,016		7,171		2,396		4,813
Consumer and other		225		243		93		238
Total		9,545		11,390		3,480		7,944
Total:
Construction, land development and other land loans		521		527		221		527
Agriculture and agriculture real estate (includes farmland)		232		242		21		144
1-4 family (includes home equity)		2,603		2,786		242		2,961
Commercial real estate (includes multi-family residential)		6,190		7,820		507		6,488
Commercial and industrial		11,019		11,365		2,396		11,652
Consumer and other		366		404		93		4,390
	$	20,931	$	23,144	$	3,480	$	26,162

	December 31, 2014
			Unpaid				Average
	Recorded		Principal		Related		Recorded
	Investment		Balance		Allowance		Investment
	(Dollars in thousands)
With no related allowance recorded:
Construction, land development and other land loans	$	250	$	256	$	-	$	264
Agriculture and agriculture real estate (includes farmland)		-		-		-		7
1-4 family (includes home equity)		1,710		1,831		-		1,147
Commercial real estate (includes multi-family residential)		5,093		5,126		-		3,792
Commercial and industrial		9,485		9,678		-		4,794
Consumer and other		8,144		8,161		-		4,080
Total		24,682		25,052		-		14,084
With an allowance recorded:
Construction, land development and other land loans		276		276		225		138
Agriculture and agriculture real estate (includes farmland)		46		55		24		34
1-4 family (includes home equity)		1,426		1,473		418		1,973
Commercial real estate (includes multi-family residential)		62		63		24		838
Commercial and industrial		2,454		4,182		1,597		1,783
Consumer and other		234		251		205		164
Total		4,498		6,300		2,493		4,930
Total:
Construction, land development and other land loans		526		532		225		402
Agriculture and agriculture real estate (includes farmland)		46		55		24		41
1-4 family (includes home equity)		3,136		3,304		418		3,120
Commercial real estate (includes multi-family residential)		5,155		5,189		24		4,630
Commercial and industrial		11,939		13,860		1,597		6,577
Consumer and other		8,378		8,412		205		4,244
	$	29,180	$	31,352	$	2,493	$	19,014

Financing Receivable Credit Quality Indicators [Table Text Block]

	Construction,		Agriculture and				Commercial
	Land		Agriculture				Real Estate
	Development and		Real Estate		1-4 Family (includes		(includes Multi-		Commercial
	Other Land Loans		(includes Farmland)		Home Equity)(1)		Family Residential)		and Industrial		Consumer and Other		Total
	(Dollars in thousands)
Grade 1	$	-	$	6,525	$	-	$	-	$	57,718	$	42,502	$	106,745
Grade 2		19,526		5,630		26,790		26,052		24,696		36,338		139,032
Grade 3		992,318		509,825		2,467,982		2,814,735		1,438,160		190,968		8,413,988
Grade 4		24,698		14,126		30,536		107,547		111,401		2,894		291,202
Grade 5		486		6,367		1,097		11,914		47,162		16		67,042
Grade 6		2,024		13,630		7,830		32,534		13,943		7,778		77,739
Grade 7		521		232		2,603		6,190		10,930		366		20,842
Grade 8		-		-		-		-		89		-		89
Grade 9		-		-		-		-		-		-		-
PCI Loans (2)		1,272		504		5,844		22,684		19,022		-		49,326
Total	$	1,040,845	$	556,839	$	2,542,682	$	3,021,656	$	1,723,121	$	280,862	$	9,166,005

	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	$	-	$	13,507	$	-	$	-	$	61,697	$	41,240	$	116,444
Grade 2		-		-		-		-		-		-		-
Grade 3		1,022,002		528,400		2,503,679		2,965,455		1,698,558		257,588		8,975,682
Grade 4		-		-		-		-		-		-		-
Grade 5		497		4,265		1,174		10,424		3,266		18		19,644
Grade 6		2,308		4,921		8,266		25,839		4,707		50		46,091
Grade 7		526		46		3,136		5,155		11,834		8,378		29,075
Grade 8		-		-		-		-		105		-		105
Grade 9		-		-		-		-		-		-		-
PCI Loans (2)		1,142		507		5,926		23,467		26,100		-		57,142
Total	$	1,026,475	$	551,646	$	2,522,181	$	3,030,340	$	1,806,267	$	307,274	$	9,244,183

Schedule of Investment in Loans and Activity in Allowance for Credit Losses by Portfolio Segment [Table Text Block]

	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 January 1, 2015	$	15,825		$	3,722		$	16,377		$	12,744		$	30,002		$	2,092		$	80,762
Provision for credit losses		1,178			(523	)		487			(173	)		586			(305	)		1,250
Charge-offs		(151	)		-			(98	)		(43	)		(728	)		(729	)		(1,749	)
Recoveries		6			78			12			10			224			370			700
Net charge-offs		(145	)		78			(86	)		(33	)		(504	)		(359	)		(1,049	)
Balance March 31, 2015	$	16,858		$	3,277		$	16,778		$	12,538		$	30,084		$	1,428		$	80,963
Allowance for credit losses:
Three Months Ended
Balance January 1, 2014	$	14,353		$	1,229		$	17,046		$	24,835		$	8,167		$	1,652		$	67,282
Provision for credit losses		(770	)		46			1,804			(1,404	)		567			357			600
Charge-offs		(2	)		(14	)		(139	)		(102	)		(143	)		(1,045	)		(1,445	)
Recoveries		19			95			7			42			62			434			659
Net charge-offs		17			81			(132	)		(60	)		(81	)		(611	)		(786	)
Balance March 31, 2014	$	13,600		$	1,356		$	18,718		$	23,371		$	8,653		$	1,398		$	67,096

	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:
March 31, 2015
Individually evaluated for impairment	$	221	$	21	$	242	$	507	$	2,396	$	93	$	3,480
Collectively evaluated for impairment		16,637		3,256		16,536		12,031		26,276		1,335		76,071
PCI loans		-		-		-		-		1,412		-		1,412
Total allowance for credit losses	$	16,858	$	3,277	$	16,778	$	12,538	$	30,084	$	1,428	$	80,963
December 31, 2014
Individually evaluated for impairment	$	225	$	24	$	418	$	24	$	1,597	$	205	$	2,493
Collectively evaluated for impairment		15,600		3,698		15,959		12,720		28,405		1,887		78,269
PCI loans		-		-		-		-		-		-		-
Total allowance for credit losses	$	15,825	$	3,722	$	16,377	$	12,744	$	30,002	$	2,092	$	80,762
March 31, 2014
Individually evaluated for impairment	$	-	$	48	$	767	$	7	$	1,217	$	92	$	2,131
Collectively evaluated for impairment		13,600		1,308		17,951		23,364		7,436		1,306		64,965
PCI loans		-		-		-		-		-		-		-
Total allowance for credit losses	$	13,600	$	1,356	$	18,718	$	23,371	$	8,653	$	1,398	$	67,096

			Agriculture
	Construction,		and				Commercial
	Land		Agriculture		1-4 Family		Real Estate
	Development		Real Estate		(includes		(includes		Commercial
	and Other		(includes		Home		Multi-Family		and		Consumer
	Land Loans		Farmland)		Equity)		Residential)		Industrial		and Other		Total
	(Dollars in thousands)
Recorded investment in loans:
March 31, 2015
Individually evaluated for impairment	$	521	$	232	$	2,603	$	6,190	$	11,019	$	366	$	20,931
Collectively evaluated for impairment		1,039,052		556,103		2,523,613		2,992,782		1,693,080		280,496		9,085,126
PCI loans		1,272		504		5,844		22,684		19,022		-		49,326
Total loans evaluated for impairment	$	1,040,845	$	556,839	$	2,532,060	$	3,021,656	$	1,723,121	$	280,862	$	9,155,383
December 31, 2014
Individually evaluated for impairment	$	526	$	46	$	3,136	$	5,155	$	11,939	$	8,378	$	29,180
Collectively evaluated for impairment		1,024,807		551,093		2,504,517		3,001,718		1,768,228		298,896		9,149,259
PCI loans		1,142		507		5,926		23,467		26,100		-		57,142
Total loans evaluated for impairment	$	1,026,475	$	551,646	$	2,513,579	$	3,030,340	$	1,806,267	$	307,274	$	9,235,581
March 31, 2014
Individually evaluated for impairment	$	324	$	207	$	2,949	$	1,422	$	1,562	$	149	$	6,613
Collectively evaluated for impairment		885,267		512,058		2,159,996		2,681,641		1,248,064		215,557		7,702,583
PCI loans		3,394		592		3,943		26,323		5,394		-		39,646
Total loans evaluated for impairment	$	888,985	$	512,857	$	2,166,888	$	2,709,386	$	1,255,020	$	215,706	$	7,748,842

Troubled Debt Restructurings on Financing Receivables [Table Text Block]

	Three Months Ended March 31,
	2015						2014
			Pre-		Post-				Pre-		Post-
			Modification		Modification				Modification		Modification
			Outstanding		Outstanding				Outstanding		Outstanding
	Number of		Recorded		Recorded		Number of		Recorded		Recorded
	Loans		Investment		Investment		Loans		Investment		Investment
	(Dollars in thousands)
Troubled Debt Restructurings
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)		-		-		-		1		35		35
Commercial and industrial		-		-		-		1		16		16
Consumer and other		1		10		10		-		-		-
Total		1	$	10	$	10		2	$	51	$	51

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Note 11 - Acquisitions

3 Months Ended

Mar. 31, 2015

Business Combinations [Abstract]

Business Combination Disclosure [Text Block]

11. ACQUISITIONS

Acquisition of F&M Bancorporation Inc. – On April 1, 2014, the Company completed the acquisition of F&M Bancorporation Inc. (“FMBC”) and its wholly-owned subsidiary The F&M Bank & Trust Company (collectively, “F&M”) headquartered in Tulsa, Oklahoma. F&M operated 13 banking locations: 9 in Tulsa, Oklahoma and surrounding areas; 3 in Dallas, Texas; and 1 (a loan production office) in Oklahoma City, Oklahoma. The Company acquired FMBC to further expand its Oklahoma and Dallas, Texas area markets. The acquisition was not considered significant to the Company’s financial statements and therefore pro forma financial data and related disclosures are not included.

The Company acquired loans and deposits with fair values of $1.60 billion and $2.27 billion, respectively, at acquisition date. Under the terms of the definitive agreement, the Company issued 3,298,022 shares of Company common stock plus $34.2 million in cash for all outstanding shares of FMBC capital stock for total merger consideration of $252.4 million based on the Company’s closing stock price of $66.15. During 2014, the Company recognized goodwill of $198.2 million. As of March 31, 2015, total goodwill related to the F&M acquisition was $206.0 million, after recording a $7.8 million measurement period adjustment during the first quarter 2015. 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 $27.1 million of core deposit intangibles related to this acquisition.

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Note 7 - Goodwill and Core Deposit Intangibles

3 Months Ended

Mar. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets Disclosure [Text Block]

7. GOODWILL AND CORE DEPOSIT INTANGIBLES 

Changes in the carrying amount of the Company’s goodwill and core deposit intangibles (“CDI”) for the three months ended March 31, 2015 and the year ended December 31, 2014 were as follows:

			Core Deposit
	Goodwill		Intangibles
	(Dollars in thousands)
Balance as of December 31, 2013	$	1,671,520	$	42,049
Less:
Amortization		-		(9,940	)
Add:
Measurement period adjustments		4,426		(302	)
Acquisition of F&M Bancorporation Inc.		198,245		27,140
Balance as of December 31, 2014		1,874,191		58,947
Less:
Amortization		-		(2,489	)
Add:
Measurement period adjustments		7,764		-
Balance as of March 31, 2015	$	1,881,955	$	56,458

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 reflected in the table above 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 other intangibles has occurred. If any such impairment is determined, a write-down is recorded. As of March 31, 2015, there were no impairments recorded on goodwill and other intangibles.

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 $2.5 million and $2.0 million for the three months ended March 31, 2015 and 2014, respectively. The estimated aggregate future amortization expense for CDI remaining as of March 31, 2015 is as follows (dollars in thousands):

Remaining 2015	$	7,041
2016		8,519
2017		6,327
2018		5,400
2019		4,546
Thereafter		24,625
Total	$	56,458

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Note 5 - Loans and Allowance for Credit Losses

3 Months Ended

Mar. 31, 2015

Loans And Allowance For Credit Losses [Abstract]

Loans And Allowance For Credit Losses [Text Block]

5. LOANS AND ALLOWANCE FOR CREDIT LOSSES

The loan portfolio consists of various types of loans made principally to borrowers located within the states of Texas and Oklahoma and is categorized by major type as follows:

	March 31,		December 31,
	2015		2014
	(Dollars in thousands)
Residential mortgage loans held for sale	$	10,622	$	8,602
Commercial and industrial		1,723,121		1,806,267
Real estate:
Construction, land development and other land loans		1,040,845		1,026,475
1-4 family residential (including home equity)		2,532,060		2,513,579
Commercial real estate (including multi-family residential)		3,021,656		3,030,340
Farmland		380,303		361,943
Agriculture		176,536		189,703
Consumer and other		280,862		307,274
Total loans held for investment		9,155,383		9,235,581
Total	$	9,166,005	$	9,244,183

(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 thorough underwriting and more active servicing than other types of loans.

(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 March 31, 2015, approximately 48.9% 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, there is no assurance that the Company will 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. While the Company has underwriting procedures designed to identify what it believes to be acceptable levels of risks in construction lending, no assurance can be given that these procedures will prevent losses from the risks described above.

(v) Agriculture Loans. The Company provides agriculture loans for short-term 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.

Concentrations of Credit. Most of the Company’s lending activity occurs within the states of Texas and Oklahoma. The majority of the Company’s loan portfolio consists of commercial real estate, 1-4 family residential loans, and commercial and industrial loans. As of March 31, 2015 and December 31, 2014, 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 was not significant at March 31, 2015 or December 31, 2014.

Related Party Loans. As of March 31, 2015 and December 31, 2014, loans outstanding to directors, officers and their affiliates totaled $5.0 million and $4.9 million, respectively. All transactions entered into between the Company and such related parties are done 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:

	March 31,			December 31,
	2015			2014
	(Dollars in thousands)
Beginning balance on January 1	$	4,940		$	6,187
New loans and reclassified related loans		174			4,943
Repayments		(76	)		(6,190	)
Ending balance	$	5,038		$	4,940

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 and the Company also monitors its delinquency levels for any negative or adverse trends. There can be no assurance, however, that the Company’s loan portfolio will not 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.

The Company requires appraisals on loans collateralized by real estate. 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: 

	March 31, 2015
	Loans Past Due and Still Accruing
			90 or More		Total Past		Nonaccrual		Current		Total
	30-89 Days		Days		Due Loans		Loans		Loans		Loans
	(Dollars in thousands)
Construction, land development and other land loans other land loans	$	6,239	$	2,128	$	8,367	$	651	$	1,031,827	$	1,040,845
Agriculture and agriculture real estate (includes farmland)		1,811		-		1,811		280		554,748		556,839
1-4 family (includes home equity) (1)		3,607		38		3,645		3,003		2,536,034		2,542,682
Commercial real estate (includes multi-family residential)		10,839		671		11,510		8,373		3,001,773		3,021,656
Commercial and industrial		16,931		131		17,062		16,566		1,689,493		1,723,121
Consumer and other		1,523		-		1,523		379		278,960		280,862
Total	$	40,950	$	2,968	$	43,918	$	29,252	$	9,092,835	$	9,166,005

	December 31, 2014
	Loans Past Due and Still Accruing
			90 or More		Total Past		Nonaccrual		Current		Total
	30-89 Days		Days		Due Loans		Loans		Loans		Loans
	(Dollars in thousands)
Construction, land development and other land loans	$	7,667	$	-	$	7,667	$	526	$	1,018,282	$	1,026,475
Agriculture and agriculture real estate (includes farmland)		2,995		377		3,372		96		548,178		551,646
1-4 family (includes home equity) (1)		2,261		82		2,343		3,570		2,516,268		2,522,181
Commercial real estate (includes multi-family residential)		12,679		65		12,744		6,340		3,011,256		3,030,340
Commercial and industrial		18,305		869		19,174		20,537		1,766,556		1,806,267
Consumer and other		612		800		1,412		353		305,509		307,274
Total	$	44,519	$	2,193	$	46,712	$	31,422	$	9,166,049	$	9,244,183

(1) Includes $10.6 million and $8.6 million of residential mortgage loans held for sale at March 31, 2015 and December 31, 2014, respectively.

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

	March 31,			December 31,
	2015			2014
	(Dollars in thousands)
Nonaccrual loans (1)	$	29,252		$	31,422
Accruing loans 90 or more days past due		2,968			2,193
Total nonperforming loans		32,220			33,615
Repossessed assets		146			67
Other real estate		3,010			3,237
Total nonperforming assets	$	35,376		$	36,919
Nonperforming assets to total loans and other real estate		0.39	%		0.40	%

(1) Includes troubled debt restructurings of $766 thousand and $911 thousand as of March 31, 2015 and December 31, 2014, respectively.

The Company had $35.4 million in nonperforming assets at March 31, 2015 compared with $36.9 million at December 31, 2014, of which $30.6 million and $30.7 million were originated by acquired banks, respectively. These results are reflective of the Company’s conservative lending approach.

If interest on nonaccrual loans had been accrued under the original loan terms, approximately $910 thousand and $234 thousand would have been recorded as income for the three months ended March 31, 2015 and 2014, 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 acquisitions completed during 2014 or 2013). 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 March 31, 2015 and December 31, 2014, including accrued but unpaid interest and any amounts previously charged off.

	March 31,		December 31,
	2015		2014
	(Dollars in thousands)
PCI loans:
Outstanding balance	$	100,973	$	129,412
Less: discount		51,647		72,270
Recorded investment	$	49,326	$	57,142

Changes in the accretable yield for acquired PCI loans as of the three months ended March 31, 2015 and 2014 were as follows:

	Three Months Ended March 31,
	2015			2014
	(Dollars in thousands)
Balance at beginning of period	$	9,867		$	7,569
Additions		-			-
Reclassifications from nonaccretable		7,291			1,503
Accretion		(9,288	)		(2,888	)
Balance at March 31	$	7,870		$	6,184

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 March 31, 2015 and 2014, including accrued but unpaid interest and any amounts previously charged off.

	March 31,		December 31,
	2015		2014
	(Dollars in thousands)
Non-PCI loans:
Outstanding balance	$	1,939,609	$	2,186,111
Less: discount		78,289		89,105
Recorded investment	$	1,861,320	$	2,097,006

Changes in the discount accretion for Non-PCI loans for the three months ended March 31, 2015 and 2014 were as follows:

	Three Months Ended March 31,
	2015			2014
	(Dollars in thousands)
Balance at beginning of period	$	89,105		$	87,798
Accretion charge-offs		(457	)		(48	)
Accretion		(10,359	)		(10,587	)
Balance at March 31	$	78,289		$	77,163

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.

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.

	March 31, 2015
			Unpaid				Average
	Recorded		Principal		Related		Recorded
	Investment		Balance		Allowance		Investment
	(Dollars in thousands)
With no related allowance recorded:
Construction, land development and other land loans	$	245	$	251	$	-	$	251
Agriculture and agriculture real estate (includes farmland)		190		190		-		95
1-4 family (includes home equity)		1,415		1,532		-		1,621
Commercial real estate (includes multi-family residential)		5,392		5,426		-		5,260
Commercial and industrial		4,003		4,194		-		6,839
Consumer and other		141		161		-		4,152
Total		11,386		11,754		-		18,218
With an allowance recorded:
Construction, land development and other land loans		276		276		221		276
Agriculture and agriculture real estate (includes farmland)		42		52		21		49
1-4 family (includes home equity)		1,188		1,254		242		1,340
Commercial real estate (includes multi-family residential)		798		2,394		507		1,228
Commercial and industrial		7,016		7,171		2,396		4,813
Consumer and other		225		243		93		238
Total		9,545		11,390		3,480		7,944
Total:
Construction, land development and other land loans		521		527		221		527
Agriculture and agriculture real estate (includes farmland)		232		242		21		144
1-4 family (includes home equity)		2,603		2,786		242		2,961
Commercial real estate (includes multi-family residential)		6,190		7,820		507		6,488
Commercial and industrial		11,019		11,365		2,396		11,652
Consumer and other		366		404		93		4,390
	$	20,931	$	23,144	$	3,480	$	26,162

	December 31, 2014
			Unpaid				Average
	Recorded		Principal		Related		Recorded
	Investment		Balance		Allowance		Investment
	(Dollars in thousands)
With no related allowance recorded:
Construction, land development and other land loans	$	250	$	256	$	-	$	264
Agriculture and agriculture real estate (includes farmland)		-		-		-		7
1-4 family (includes home equity)		1,710		1,831		-		1,147
Commercial real estate (includes multi-family residential)		5,093		5,126		-		3,792
Commercial and industrial		9,485		9,678		-		4,794
Consumer and other		8,144		8,161		-		4,080
Total		24,682		25,052		-		14,084
With an allowance recorded:
Construction, land development and other land loans		276		276		225		138
Agriculture and agriculture real estate (includes farmland)		46		55		24		34
1-4 family (includes home equity)		1,426		1,473		418		1,973
Commercial real estate (includes multi-family residential)		62		63		24		838
Commercial and industrial		2,454		4,182		1,597		1,783
Consumer and other		234		251		205		164
Total		4,498		6,300		2,493		4,930
Total:
Construction, land development and other land loans		526		532		225		402
Agriculture and agriculture real estate (includes farmland)		46		55		24		41
1-4 family (includes home equity)		3,136		3,304		418		3,120
Commercial real estate (includes multi-family residential)		5,155		5,189		24		4,630
Commercial and industrial		11,939		13,860		1,597		6,577
Consumer and other		8,378		8,412		205		4,244
	$	29,180	$	31,352	$	2,493	$	19,014

Credit Quality Indicators. As part of the ongoing 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 credit 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.

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 March 31, 2015. Impaired loans include loans in risk grades 7, 8 and 9.

	Construction,		Agriculture and				Commercial
	Land		Agriculture				Real Estate
	Development and		Real Estate		1-4 Family (includes		(includes Multi-		Commercial
	Other Land Loans		(includes Farmland)		Home Equity)(1)		Family Residential)		and Industrial		Consumer and Other		Total
	(Dollars in thousands)
Grade 1	$	-	$	6,525	$	-	$	-	$	57,718	$	42,502	$	106,745
Grade 2		19,526		5,630		26,790		26,052		24,696		36,338		139,032
Grade 3		992,318		509,825		2,467,982		2,814,735		1,438,160		190,968		8,413,988
Grade 4		24,698		14,126		30,536		107,547		111,401		2,894		291,202
Grade 5		486		6,367		1,097		11,914		47,162		16		67,042
Grade 6		2,024		13,630		7,830		32,534		13,943		7,778		77,739
Grade 7		521		232		2,603		6,190		10,930		366		20,842
Grade 8		-		-		-		-		89		-		89
Grade 9		-		-		-		-		-		-		-
PCI Loans (2)		1,272		504		5,844		22,684		19,022		-		49,326
Total	$	1,040,845	$	556,839	$	2,542,682	$	3,021,656	$	1,723,121	$	280,862	$	9,166,005

(1) Includes $10.6 million of residential mortgage loans held for sale at March 31, 2015.

(2) Of the total PCI loans, $28.2 million were classifed as substandard at March 31, 2015.

The following table presents risk grades and PCI loans by category of loan at December 31, 2014. Impaired loans include loans in risk grades 7, 8 and 9.

	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	$	-	$	13,507	$	-	$	-	$	61,697	$	41,240	$	116,444
Grade 2		-		-		-		-		-		-		-
Grade 3		1,022,002		528,400		2,503,679		2,965,455		1,698,558		257,588		8,975,682
Grade 4		-		-		-		-		-		-		-
Grade 5		497		4,265		1,174		10,424		3,266		18		19,644
Grade 6		2,308		4,921		8,266		25,839		4,707		50		46,091
Grade 7		526		46		3,136		5,155		11,834		8,378		29,075
Grade 8		-		-		-		-		105		-		105
Grade 9		-		-		-		-		-		-		-
PCI Loans (2)		1,142		507		5,926		23,467		26,100		-		57,142
Total	$	1,026,475	$	551,646	$	2,522,181	$	3,030,340	$	1,806,267	$	307,274	$	9,244,183

(1) Includes $8.6 million of residential mortgage loans held for sale at December 31, 2014.

(2) Of the total PCI loans, $32.0 million were classifed as substandard at December 31, 2014.

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 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: 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 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;

• 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 agricultural 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 agricultural 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 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 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.

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.

At March 31, 2015, the allowance for credit losses totaled $81.0 million or 0.88% of total loans, including acquired loans with discounts. At December 31, 2014, the allowance totaled $80.8 million or 0.87% of total loans, including loans with discounts.

The following table details activity in the allowance for loan losses by category of loan for the three months ended March 31, 2015 and 2014. 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 January 1, 2015	$	15,825		$	3,722		$	16,377		$	12,744		$	30,002		$	2,092		$	80,762
Provision for credit losses		1,178			(523	)		487			(173	)		586			(305	)		1,250
Charge-offs		(151	)		-			(98	)		(43	)		(728	)		(729	)		(1,749	)
Recoveries		6			78			12			10			224			370			700
Net charge-offs		(145	)		78			(86	)		(33	)		(504	)		(359	)		(1,049	)
Balance March 31, 2015	$	16,858		$	3,277		$	16,778		$	12,538		$	30,084		$	1,428		$	80,963
Allowance for credit losses:
Three Months Ended
Balance January 1, 2014	$	14,353		$	1,229		$	17,046		$	24,835		$	8,167		$	1,652		$	67,282
Provision for credit losses		(770	)		46			1,804			(1,404	)		567			357			600
Charge-offs		(2	)		(14	)		(139	)		(102	)		(143	)		(1,045	)		(1,445	)
Recoveries		19			95			7			42			62			434			659
Net charge-offs		17			81			(132	)		(60	)		(81	)		(611	)		(786	)
Balance March 31, 2014	$	13,600		$	1,356		$	18,718		$	23,371		$	8,653		$	1,398		$	67,096

The following table details the amount of the allowance for loan losses allocated to each category of loan as of March 31, 2015, December 31, 2014 and March 31, 2014, detailed 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:
March 31, 2015
Individually evaluated for impairment	$	221	$	21	$	242	$	507	$	2,396	$	93	$	3,480
Collectively evaluated for impairment		16,637		3,256		16,536		12,031		26,276		1,335		76,071
PCI loans		-		-		-		-		1,412		-		1,412
Total allowance for credit losses	$	16,858	$	3,277	$	16,778	$	12,538	$	30,084	$	1,428	$	80,963
December 31, 2014
Individually evaluated for impairment	$	225	$	24	$	418	$	24	$	1,597	$	205	$	2,493
Collectively evaluated for impairment		15,600		3,698		15,959		12,720		28,405		1,887		78,269
PCI loans		-		-		-		-		-		-		-
Total allowance for credit losses	$	15,825	$	3,722	$	16,377	$	12,744	$	30,002	$	2,092	$	80,762
March 31, 2014
Individually evaluated for impairment	$	-	$	48	$	767	$	7	$	1,217	$	92	$	2,131
Collectively evaluated for impairment		13,600		1,308		17,951		23,364		7,436		1,306		64,965
PCI loans		-		-		-		-		-		-		-
Total allowance for credit losses	$	13,600	$	1,356	$	18,718	$	23,371	$	8,653	$	1,398	$	67,096

The following table details the recorded investment in loans as of March 31, 2015, December 31, 2014 and March 31, 2014, excluding $10.6 million, $8.6 million and $3.6 million, respectively, of residential mortgage loans held for sale, related to each balance in the allowance for loan losses by category of loan.

			Agriculture
	Construction,		and				Commercial
	Land		Agriculture		1-4 Family		Real Estate
	Development		Real Estate		(includes		(includes		Commercial
	and Other		(includes		Home		Multi-Family		and		Consumer
	Land Loans		Farmland)		Equity)		Residential)		Industrial		and Other		Total
	(Dollars in thousands)
Recorded investment in loans:
March 31, 2015
Individually evaluated for impairment	$	521	$	232	$	2,603	$	6,190	$	11,019	$	366	$	20,931
Collectively evaluated for impairment		1,039,052		556,103		2,523,613		2,992,782		1,693,080		280,496		9,085,126
PCI loans		1,272		504		5,844		22,684		19,022		-		49,326
Total loans evaluated for impairment	$	1,040,845	$	556,839	$	2,532,060	$	3,021,656	$	1,723,121	$	280,862	$	9,155,383
December 31, 2014
Individually evaluated for impairment	$	526	$	46	$	3,136	$	5,155	$	11,939	$	8,378	$	29,180
Collectively evaluated for impairment		1,024,807		551,093		2,504,517		3,001,718		1,768,228		298,896		9,149,259
PCI loans		1,142		507		5,926		23,467		26,100		-		57,142
Total loans evaluated for impairment	$	1,026,475	$	551,646	$	2,513,579	$	3,030,340	$	1,806,267	$	307,274	$	9,235,581
March 31, 2014
Individually evaluated for impairment	$	324	$	207	$	2,949	$	1,422	$	1,562	$	149	$	6,613
Collectively evaluated for impairment		885,267		512,058		2,159,996		2,681,641		1,248,064		215,557		7,702,583
PCI loans		3,394		592		3,943		26,323		5,394		-		39,646
Total loans evaluated for impairment	$	888,985	$	512,857	$	2,166,888	$	2,709,386	$	1,255,020	$	215,706	$	7,748,842

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. Per ASU No. 2011-02, “Receivables (Topic 310)-A Creditor’s Determination of Whether a Restructuring Is a Troubled Debt Restructuring” the Company reassesses all loan modifications to identify whether the restructuring constitutes as troubled debt restructurings. The following table presents information regarding the recorded investment of loans modified in a troubled debt restructuring during the three months ended March 31, 2015 and 2014:

	Three Months Ended March 31,
	2015						2014
			Pre-		Post-				Pre-		Post-
			Modification		Modification				Modification		Modification
			Outstanding		Outstanding				Outstanding		Outstanding
	Number of		Recorded		Recorded		Number of		Recorded		Recorded
	Loans		Investment		Investment		Loans		Investment		Investment
	(Dollars in thousands)
Troubled Debt Restructurings
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)		-		-		-		1		35		35
Commercial and industrial		-		-		-		1		16		16
Consumer and other		1		10		10		-		-		-
Total		1	$	10	$	10		2	$	51	$	51

As of March 31, 2015, there have been no defaults on any loans that were modified as troubled debt restructurings during the preceding three months. Default is determined at 90 or more days past due. The modifications primarily 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 March 31, 2015 and 2014, the Company had $766 thousand and $1.4 million, respectively, in outstanding troubled debt restructurings. For the three months ended March 31, 2015, the Company added 1 loan totaling $10 thousand as a new troubled debt restructuring, of which $10 thousand was still outstanding at March 31, 2015. These modifications did not have a material impact on the Company’s determination of the allowance for credit losses.

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Note 6 - Fair Value

3 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value Disclosures [Text Block]

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 at fair value other assets 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 future expected loss experience, 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 March 31, 2015
	Level 1		Level 2			Level 3		Total
	(Dollars in thousands)
Assets:
Available for sale securities:
States and political subdivisions	$	-	$	9,304		$	-	$	9,304
Collateralized mortgage obligations		-		31,877			-		31,877
Mortgage-backed securities		-		77,697			-		77,697
Other securities		12,867		-			-		12,867
Total	$	12,867	$	118,878		$	-	$	131,745
Non-hedging interest rate swap	$	-	$	450		$	-	$	450
Liabilities:
Non-hedging interest rate swap	$	-	$	(450	)	$	-	$	(450	)

	As of December 31, 2014
	Level 1		Level 2			Level 3		Total
	(Dollars in thousands)
Assets:
Available for sale securities:
States and political subdivisions	$	-	$	14,585		$	-	$	14,585
Collateralized mortgage obligations		-		33,573			-		33,573
Mortgage-backed securities		-		84,483			-		84,483
Other securities		12,758		-			-		12,758
Total	$	12,758	$	132,641		$	-	$	145,399
Non-hedging interest rate swap	$	-	$	303		$	-	$	303
Liabilities:
Non-hedging interest rate swap	$	-	$	(303	)	$	-	$	(303	)

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, held to maturity debt securities, loans held for sale, and impaired loans. For the three months ended March 31, 2015, the Company had additions to other real estate owned of $983 thousand of which $733 thousand were outstanding as of March 31, 2015. For the three months ended March 31, 2015, the Company had additions to impaired loans of $1.5 million, of which $1.5 million were still outstanding as of March 31, 2015. The remaining assets and liabilities measured at fair value on a nonrecurring basis that were recorded in 2015 and remained outstanding at March 31, 2015 were not significant.

The following table presents carrying and fair value information of financial instruments as of the dates indicated:

	As of March 31, 2015
	Carrying		Estimated Fair Value
	Amount		Level 1		Level 2		Level 3		Total
	(Dollars in thousands)
Assets
Cash and due from banks	$	352,642	$	352,642	$	-	$	-	$	352,642
Federal funds sold		1,639		1,639		-		-		1,639
Held to maturity securities		9,447,751		-		9,536,103		-		9,536,103
Loans held for sale		10,622		-		10,622		-		10,622
Loans held for investment, net of allowance		9,074,420		-		-		9,154,675		9,154,675
Other real estate owned		3,010		-		3,010		-		3,010
Liabilities
Deposits:
Noninterest-bearing	$	5,038,436	$	-	$	5,038,436	$	-	$	5,038,436
Interest-bearing		12,522,916		-		12,531,588		-		12,531,588
Other borrowings		331,914		-		332,804		-		332,804
Securities sold under repurchase agreements		318,418		-		318,434		-		318,434
Junior subordinated debentures		-		-		-		-		-

	As of December 31, 2014
	Carrying		Estimated Fair Value
	Amount		Level 1		Level 2		Level 3		Total
	(Dollars in thousands)
Assets
Cash and due from banks	$	677,285	$	677,285	$	-	$	-	$	677,285
Federal funds sold		569		569		-		-		569
Held to maturity securities		8,900,377		-		8,948,692		-		8,948,692
Loans held for sale		8,602		-		8,602		-		8,602
Loans held for investment, net of allowance		9,154,819		-		-		9,192,231		9,192,231
Other real estate owned		3,237		-		3,237		-		3,237
Liabilities
Deposits:
Noninterest-bearing	$	4,936,420	$	-	$	4,936,420	$	-	$	4,936,420
Interest-bearing		12,756,738		-		12,767,961		-		12,767,961
Other borrowings		8,724		-		10,000		-		10,000
Securities sold under repurchase agreements		315,523		-		315,543		-		315,543
Junior subordinated debentures		167,531		-		159,740		-		159,740

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.

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.

Junior subordinated debentures—The fair value of the junior subordinated debentures was calculated using the quoted market prices, if available. If quoted market prices are not available, fair value is estimated using quoted market prices for similar subordinated debentures. Junior subordinated debentures 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.

Derivative financial instruments—The fair value of the underlying non-hedging derivative contracts offset each other 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 March 31, 2015. 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.

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Note 8 - Stock Based Compensation

3 Months Ended

Mar. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Disclosure of Compensation Related Costs, Share-based Payments [Text Block]

8. STOCK BASED COMPENSATION 

At March 31, 2015, the Company had three stock-based employee compensation plans. Two of the three plans adopted by the Company have expired and therefore no additional awards may be issued under those plans.

During 1998, the Company’s Board of Directors and shareholders approved the Prosperity Bancshares, Inc. 1998 Stock Incentive Plan (the “1998 Plan”) which authorized the issuance of up to 920,000 (after two-for-one stock split) shares of the common stock of Bancshares under both non-qualified and incentive stock options to employees and non-qualified stock options to directors who are not employees. The 1998 Plan also provided for the granting of restricted stock awards, stock appreciation rights, phantom stock awards and performance awards on substantially similar terms. The 1998 Plan has expired and therefore no additional options may be issued from the 1998 Plan.

During 2004, the Company’s Board of Directors adopted the Prosperity Bancshares, Inc. 2004 Stock Incentive Plan (the “2004 Plan”) which was approved by the Company's 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 the granting of incentive and nonqualified stock options to employees and nonqualified stock options to directors who were not employees. The 2004 Plan also provided for the granting 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 from the 2004 Plan.

During 2012, the Company’s Board of Directors and shareholders adopted the Prosperity Bancshares, Inc. 2012 Stock Incentive Plan (the “2012 Plan”), which authorizes 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 284,043 shares have been granted under the 2012 Plan as of March 31, 2015.  

The Company received no cash from the exercise of stock options for the three month period ended March 31, 2015 and $1.8 million in cash for the three month period ended March 31, 2014. There was no tax benefit realized from option exercises of the share-based payment arrangements during the three month periods ended March 31, 2015 and 2014.

As of March 31, 2015, there was $28.4 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 2.05 years.

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Note 5 - Loans and Allowance for Credit Losses (Details) (USD $)	3 Months Ended			12 Months Ended
	Mar. 31, 2015		Mar. 31, 2014	Dec. 31, 2014		Dec. 31, 2013
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Percentage of Outstanding Principal Balance Commercial Real Estate Loans	48.90%
Loans and Leases Receivable, Related Parties	$ 5,038,000			$ 4,940,000		$ 6,187,000
Financing Receivable, Recorded Investment, Nonaccrual Status	29,252,000	[1]		31,422,000	[1]
Other Real Estate, Foreclosed Assets, and Repossessed Assets	35,376,000			36,919,000
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	910,000		234,000
Allowance for Loan and Lease Losses, Loans Acquired				0		0
Impaired Financing Receivable, Interest Income, Cash Basis Method	0
Maximum Percentage of Principal and Interest Collectible Substandard Impaired Loans	100.00%
Disposal Group, Including Discontinued Operation, Loans Receivable, Net	10,622,000			8,602,000
Loans and Leases Receivable, Allowance	80,963,000		67,096,000	80,762,000		67,282,000
Allowance for Credit Losses as Percentage of Loans	0.88%			0.87%
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0
Financing Receivable, Modifications, Number of Contracts	1		2
Financing Receivable, Modifications, Pre-Modification Recorded Investment	10,000		51,000
Financing Receivable, Modifications, Recorded Investment	10,000
Troubled Debt Restructuring [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	766,000		1,400,000	911,000
Originated by Acquired Banks [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Other Real Estate, Foreclosed Assets, and Repossessed Assets	30,600,000			30,700,000
PCI Loans [Member] | Substandard [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Loans Receivable, Fair Value Disclosure	28,200,000			32,000,000
Commercial Real Estate Portfolio Segment [Member] | Maximum [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Period of Fixed Interest	5 years
Debt Instrument, Term	20 years
Commercial Real Estate Portfolio Segment [Member] | Minimum [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Debt Instrument, Term	15 years
1-4 Family Residential Loans [Member] | Maximum [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Debt Instrument, Term	25 years
1-4 Family Residential Loans [Member] | Minimum [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Debt Instrument, Term	5 years
1-4 Family Residential Loans [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Loan Collateralized	89.00%
Veteran Administration and Federal Housing Administration Loan [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Debt Instrument, Term	30 years
Consumer Portfolio Segment [Member] | Maximum [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Debt Instrument, Term	180 months
Consumer Portfolio Segment [Member] | Minimum [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Debt Instrument, Term	12 months
Total Loans [Member] | Credit Concentration Risk [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Concentration Risk, Percentage	0.00%			0.00%
Residential Mortgage [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Disposal Group, Including Discontinued Operation, Mortgage Loans	10,600,000		3,600,000	8,600,000
Disposal Group, Including Discontinued Operation, Loans Receivable, Net	$ 10,600,000			$ 8,600,000

[1] Includes troubled debt restructurings of $766 thousand and $911 thousand as of March 31, 2015 and December 31, 2014, respectively.

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Note 7 - Goodwill and Core Deposit Intangibles (Details) - Goodwill and Core Deposit Intangibles (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Note 7 - Goodwill and Core Deposit Intangibles (Details) - Goodwill and Core Deposit Intangibles [Line Items]
Balance	$ 1,881,955		$ 1,874,191	$ 1,671,520
Balance	56,458		58,947	42,049
Less:
Amortization	(2,489)	(2,045)	(9,940)
Add:
Measurement period adjustments- Goodwill	7,764		4,426
Measurement period adjustments-Intangibles			(302)
FM Bancorporation [Member]
Note 7 - Goodwill and Core Deposit Intangibles (Details) - Goodwill and Core Deposit Intangibles [Line Items]
Balance	206,000		198,200
Add:
Measurement period adjustments- Goodwill	7,800
Acquisition of F&M Bancorporation Inc.			198,245
Acquisition of F&M Bancorporation Inc.	$ 27,100		$ 27,140

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Note 2 - Income Per Common Share (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended March 31,
	2015				2014
			Per Share				Per Share
	Amount		Amount		Amount		Amount
	(Amounts in thousands, except per share data)
Net income	$	73,641			$	67,137
Basic:
Weighted average shares outstanding		70,034	$	1.05		66,186	$	1.01
Diluted:
Add incremental shares for:
Effect of dilutive securities - options		21				94
Total		70,055	$	1.05		66,280	$	1.01

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Note 9 - Contractual Obigations and Off-Balance Sheet Items (Tables)

3 Months Ended

Mar. 31, 2015

Table Text Block [Abstract]

Schedule of Contractual Obligations and Other Commitments [Table Text Block]

			More than 1		3 years or
			year but less		more but less		5 years
	1 year or less		than 3 years		than 5 years		or more		Total
	(Dollars in thousands)
Federal Home Loan Bank notes payable	$	326,062	$	1,803	$	4,648	$	722	$	333,235
Operating leases		6,633		9,066		4,205		7,693		27,597
Total	$	332,695	$	10,869	$	8,853	$	8,415	$	360,832

Schedule of Line of Credit Facilities [Table Text Block]

			More than 1		3 years or
			year but less		more but less		5 years
	1 year or less		than 3 years		than 5 years		or more		Total
	(Dollars in thousands)
Standby letters of credit	$	80,087	$	17,273	$	1,086	$	-	$	98,446
Commitments to extend credit		867,449		601,245		56,277		390,714		1,915,685
Total	$	947,536	$	618,518	$	57,363	$	390,714	$	2,014,131

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Note 6 - Fair Value (Details) - Financial Instruments Fair Value (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 352,642	$ 677,285
Federal funds sold	1,639	569
Held to maturity securities	9,536,103	8,948,692
Loans held for sale	10,622	8,602
Deposits:
Noninterest-bearing	5,038,436	4,936,420
Interest-bearing	12,522,916	12,756,738
Other borrowings	331,914	8,724
Securities sold under repurchase agreements	318,418	315,523
Junior subordinated debentures		167,531
Fair Value, Inputs, Level 1 [Member]
Assets
Cash and due from banks	352,642	677,285
Federal funds sold	1,639	569
Fair Value, Inputs, Level 2 [Member]
Assets
Held to maturity securities	9,536,103	8,948,692
Loans held for sale	10,622	8,602
Other real estate owned	3,010	3,237
Deposits:
Noninterest-bearing	5,038,436	4,936,420
Interest-bearing	12,531,588	12,767,961
Other borrowings	332,804	10,000
Securities sold under repurchase agreements	318,434	315,543
Junior subordinated debentures		159,740
Fair Value, Inputs, Level 3 [Member]
Assets
Loans held for investment, net of allowance	9,154,675	9,192,231
Reported Value Measurement [Member]
Assets
Cash and due from banks	352,642	677,285
Federal funds sold	1,639	569
Held to maturity securities	9,447,751	8,900,377
Loans held for sale	10,622	8,602
Loans held for investment, net of allowance	9,074,420	9,154,819
Other real estate owned	3,010	3,237
Deposits:
Noninterest-bearing	5,038,436	4,936,420
Interest-bearing	12,522,916	12,756,738
Other borrowings	331,914	8,724
Securities sold under repurchase agreements	318,418	315,523
Junior subordinated debentures		167,531
Estimate of Fair Value Measurement [Member]
Assets
Cash and due from banks	352,642	677,285
Federal funds sold	1,639	569
Held to maturity securities	9,536,103	8,948,692
Loans held for sale	10,622	8,602
Loans held for investment, net of allowance	9,154,675	9,192,231
Other real estate owned	3,010	3,237
Deposits:
Noninterest-bearing	5,038,436	4,936,420
Interest-bearing	12,531,588	12,767,961
Other borrowings	332,804	10,000
Securities sold under repurchase agreements	318,434	315,543
Junior subordinated debentures		$ 159,740

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Note 5 - Loans and Allowance for Credit Losses (Details) - Non Purchased Credit Impaired Loans (Non PCI Loans [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Non PCI Loans [Member]
Non-PCI loans:
Outstanding balance	$ 1,939,609	$ 2,186,111
Less: discount	78,289	89,105
Recorded investment	$ 1,861,320	$ 2,097,006

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Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net income	$ 73,641	$ 67,137
Securities available for sale:
Change in unrealized gain during period	(442)	(489)
Total other comprehensive loss	(442)	(489)
Deferred tax benefit related to other comprehensive loss	155	171
Other comprehensive loss, net of tax	(287)	(318)
Comprehensive income	$ 73,354	$ 66,819

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Note 2 - Income Per Common Share

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

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 March 31,
	2015				2014
			Per Share				Per Share
	Amount		Amount		Amount		Amount
	(Amounts in thousands, except per share data)
Net income	$	73,641			$	67,137
Basic:
Weighted average shares outstanding		70,034	$	1.05		66,186	$	1.01
Diluted:
Add incremental shares for:
Effect of dilutive securities - options		21				94
Total		70,055	$	1.05		66,280	$	1.01

There were no stock options exercisable during the three months ended March 31, 2015 or 2014 that would have had an anti-dilutive effect on the above computation.

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Note 10 - Other Comprehensive (Loss) Income (Details) - Activity in Accumulated Other Comprehensive Income, Net of Tax (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, accumulated other comprehensive income	$ 3,729	$ 4,883
Other comprehensive loss	(287)	(318)
Ending balance, accumulated other comprehensive income	3,442	4,565
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, accumulated other comprehensive income	3,729	4,883
Other comprehensive loss	(287)	(318)
Ending balance, accumulated other comprehensive income	$ 3,442	$ 4,565

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Note 10 - Other Comprehensive (Loss) Income (Tables)

3 Months Ended

Mar. 31, 2015

Disclosure Text Block [Abstract]

Comprehensive Income (Loss) [Table Text Block]

	Three Months Ended March 31,
	2015								2014
	Before Tax Amount			Tax Benefit		Net of Tax Amount			Before Tax Amount			Tax Benefit		Net of Tax Amount
	(Dollars in thousands)
Other comprehensive loss:
Securities available for sale:
Change in unrealized gain uring period	$	(442	)	$	155	$	(287	)	$	(489	)	$	171	$	(318	)
Total securities available for sale		(442	)		155		(287	)		(489	)		171		(318	)
Total other comprehensive loss	$	(442	)	$	155	$	(287	)	$	(489	)	$	171	$	(318	)

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

	Securities Available for Sale			Accumulated Other Comprehensive Income
	(Dollars in thousands)
Balance at January 1, 2015	$	3,729		$	3,729
Other comprehensive loss		(287	)		(287	)
Balance at March 31, 2015	$	3,442		$	3,442
Balance at January 1, 2014	$	4,883		$	4,883
Other comprehensive loss		(318	)		(318	)
Balance at March 31, 2014	$	4,565		$	4,565

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Note 5 - Loans and Allowance for Credit Losses (Details) - Nonperforming Assets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Nonperforming Assets [Abstract]
Nonaccrual loans (1)	$ 29,252	[1]	$ 31,422	[1]
Accruing loans 90 or more days past due	2,968		2,193
Total nonperforming loans	32,220		33,615
Repossessed assets	146		67
Other real estate	3,010		3,237
Total nonperforming assets	$ 35,376		$ 36,919
Nonperforming assets to total loans and other real estate	0.39%		0.40%

[1] Includes troubled debt restructurings of $766 thousand and $911 thousand as of March 31, 2015 and December 31, 2014, respectively.

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Accounting Policies, by Policy (Policies)

3 Months Ended

Mar. 31, 2015

Accounting Policies [Abstract]

New Accounting Pronouncements, Policy [Policy Text Block]

Accounting Standards Updates (“ASU”)

ASU 2015-01, “Income Statement - Extraordinary and Unusual Items (Subtopic 225-20) – Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items.” ASU 2015-01 eliminates from U.S. GAAP the concept of extraordinary items, which, among other things, required an entity to segregate extraordinary items considered to be unusual and infrequent from the results of ordinary operations and show the item separately in the income statement, net of tax, after income from continuing operations. ASU 2015-01 is effective for the Company beginning January 1, 2016, though early adoption is permitted. ASU 2015-01 is not expected to have a significant impact on the Company’s financial statements.

ASU 2014-12 “Compensation-Stock Compensation (Topic 718) - Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period.”  ASU 2014-12 requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. The performance target should not be reflected in estimating the grant-date fair value of the award. Compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the period(s) for which the requisite service has already been rendered. If the performance target becomes probable of being achieved before the end of the requisite service period, the remaining unrecognized compensation cost should be recognized prospectively over the remaining requisite service period. The total amount of compensation cost recognized during and after the requisite service period should reflect the number of awards that are expected to vest and should be adjusted to reflect those awards that ultimately vest. The requisite service period ends when the employee can cease rendering service and still be eligible to vest in the award if the performance target is achieved. ASU 2014-12 is effective for the Company beginning January 1, 2016 and is not expected to have a significant impact on the Company’s financial statements. 

ASU 2014-11 “Transfers and Servicing (Topic 860) - Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosure.”  ASU 2014-11 changes the accounting for repurchase-to-maturity transactions to secured borrowing accounting. It also requires separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting and disclosure for the repurchase agreement. ASU 2014-11 became effective for the Company on January 1, 2015 and did not have a significant impact on the Company’s financial statements. 

ASU 2014-09 “Revenue from Contract 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.  Additionally, ASU 2014-09  supersedes some cost guidance included in Revenue Recognition—Construction-Type and Production-Type Contracts (Subtopic 605-35).  In addition, the existing requirements for the recognition of a gain or loss on the transfer of nonfinancial assets that are not in a contract with a customer are amended to be consistent with the guidance on recognition and measurement.   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.  ASU 2014-09 is effective for the Company beginning January 1, 2018, with retrospective application to each prior reporting period presented, and the Company is currently evaluating the requirements and it is not expected to have a significant impact on the Company’s financial statements. 

ASU 2014-04 “Receivables—Troubled Debt Restructurings by Creditors (Subtopic 310-40) — Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure.” ASU 2014-04 intends to reduce diversity by clarifying when an in substance repossession or foreclosure occurs, that is, when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan receivable should be derecognized and the real estate property recognized. ASU 2014-04 became effective for the Company on January 1, 2015 and did not have a significant impact on the Company’s financial statements.