Prosperity Bancshares (PB) 10-Q 7 Aug 15 2015 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Aug. 03, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	PROSPERITY BANCSHARES INC
Trading Symbol	PB
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		70,041,790
Amendment Flag	false
Entity Central Index Key	1,068,851
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	Jun. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q2

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
ASSETS
Cash and due from banks	$ 353,047	$ 677,285
Federal funds sold	1,451	569
Total cash and cash equivalents	354,498	677,854
Available for sale securities, at fair value	123,229	145,399
Held to maturity securities, at cost (fair value of $9,592,825 and $8,948,692, respectively)	9,574,850	8,900,377
Total securities	9,698,079	9,045,776
Loans held for sale	10,482	8,602
Loans held for investment	9,103,853	9,235,581
Total loans	9,114,335	9,244,183
Less: allowance for credit losses	(80,972)	(80,762)
Loans, net	9,033,363	9,163,421
Accrued interest receivable	51,303	51,941
Goodwill	1,881,955	1,874,191
Core deposit intangibles, net	54,068	58,947
Bank premises and equipment, net	275,347	281,549
Other real estate owned	2,806	3,237
Bank owned life insurance (BOLI)	232,963	230,095
Federal Home Loan Bank of Dallas stock	58,132	15,432
Other assets	43,773	105,290
TOTAL ASSETS	21,686,287	21,507,733
Deposits:
Noninterest-bearing	5,040,628	4,936,420
Interest-bearing	11,961,036	12,756,738
Total deposits	17,001,664	17,693,158
Other borrowings	886,741	8,724
Securities sold under repurchase agreements	334,189	315,523
Junior subordinated debentures		167,531
Accrued interest payable	2,115	3,190
Other liabilities	104,293	74,781
Total liabilities	$ 18,329,002	$ 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; 70,076,778 and 69,816,653 shares issued at June 30, 2015 and December 31, 2014, respectively; 70,039,690 and 69,779,565 shares outstanding at June 30, 2015 and December 31, 2014, respectively	$ 70,077	$ 69,817
Capital surplus	2,030,732	2,025,235
Retained earnings	1,254,057	1,146,652
Accumulated other comprehensive income—net unrealized gain on available for sale securities, net of tax of $1,629 and $2,008, respectively	3,026	3,729
Less treasury stock, at cost, 37,088 shares	(607)	(607)
Total shareholders’ equity	3,357,285	3,244,826
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 21,686,287	$ 21,507,733

Consolidated Balance Sheets (U3

Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Held to maturity securities, fair value (in Dollars)	$ 9,592,825	$ 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	70,076,778	69,816,653
Common stock, shares outstanding	70,039,690	69,779,565
Accumulated other comprehensive income—net unrealized gain on available for sale securities, tax (in Dollars)	$ 1,629	$ 2,008
Treasury stock, shares	37,088	37,088

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
INTEREST INCOME:
Loans, including fees	$ 119,404	$ 138,655	$ 244,282	$ 245,799
Securities	48,530	47,670	97,092	94,726
Federal funds sold	47	178	212	226
Total interest income	167,981	186,503	341,586	340,751
INTEREST EXPENSE:
Deposits	9,169	10,918	18,746	20,305
Other borrowings	365	189	494	347
Securities sold under repurchase agreements	208	254	411	491
Junior subordinated debentures		1,087	791	1,862
Total interest expense	9,742	12,448	20,442	23,005
NET INTEREST INCOME	158,239	174,055	321,144	317,746
PROVISION FOR CREDIT LOSSES	500	6,325	1,750	6,925
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	157,739	167,730	319,394	310,821
NONINTEREST INCOME:
Nonsufficient funds (NSF) fees	8,310	9,099	16,228	17,969
Credit card, debit card and ATM card income	6,003	6,030	11,641	11,182
Service charges on deposit accounts	4,189	4,325	8,368	7,934
Trust income	2,047	2,044	4,056	3,844
Mortgage income	1,513	1,208	2,661	1,801
Brokerage income	1,541	1,401	2,950	2,670
Net gain on sale of assets	270	1,301	1,649	4,611
Other	6,424	7,189	11,165	11,250
Total noninterest income	30,297	32,597	58,718	61,261
NONINTEREST EXPENSE:
Salaries and employee benefits	47,819	54,126	97,785	97,534
Net occupancy and equipment	5,812	5,996	11,776	11,335
Credit and debit card, data processing and software amortization	4,045	4,009	7,862	7,193
Regulatory assessments and FDIC insurance	4,253	3,886	8,607	6,612
Core deposit intangibles amortization	2,390	2,630	4,879	4,675
Depreciation	3,420	3,522	6,336	6,723
Communications	2,835	2,919	5,644	5,656
Other real estate expense	129	188	261	584
Other	9,032	10,016	16,047	18,074
Total noninterest expense	79,735	87,292	159,197	158,386
INCOME BEFORE INCOME TAXES	108,301	113,035	218,915	213,696
PROVISION FOR INCOME TAXES	36,369	37,529	73,342	71,053
NET INCOME	$ 71,932	$ 75,506	$ 145,573	$ 142,643
EARNINGS PER SHARE:
Basic (in Dollars per share)	$ 1.03	$ 1.08	$ 2.08	$ 2.10
Diluted (in Dollars per share)	$ 1.03	$ 1.08	$ 2.08	$ 2.10

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net income	$ 71,932	$ 75,506	$ 145,573	$ 142,643
Securities available for sale:
Change in unrealized gain during period	(640)	(317)	(1,082)	(806)
Total other comprehensive loss	(640)	(317)	(1,082)	(806)
Deferred tax benefit related to other comprehensive loss	224	111	379	282
Other comprehensive loss, net of tax	(416)	(206)	(703)	(524)
Comprehensive income	$ 71,516	$ 75,300	$ 144,870	$ 142,119

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity [Unaudited] - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [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			142,643			142,643
Other comprehensive loss				(524)		(524)
Common stock issued in connection with the exercise of stock options and restricted stock awards	$ 399	2,016				2,415
Common stock issued in connection with the exercise of stock options and restricted stock awards (in Shares)	398,384
Common stock issued in connection with the acquisition of F&M Bancorporation Inc.	$ 3,298	214,866				218,164
Common stock issued in connection with the acquisition of F&M Bancorporation Inc. (in Shares)	3,298,022
Stock based compensation expense		3,709				3,709
Cash dividends declared			(32,631)			(32,631)
Balance at Jun. 30, 2014	$ 69,782	2,019,453	1,027,607	4,359	(607)	3,120,594
Balance (in Shares) at Jun. 30, 2014	69,781,585
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			145,573			145,573
Other comprehensive loss				(703)		(703)
Common stock issued in connection with the exercise of stock options and restricted stock awards	$ 260	(193)				67
Common stock issued in connection with the exercise of stock options and restricted stock awards (in Shares)	260,125
Stock based compensation expense		5,690				5,690
Cash dividends declared			(38,168)			(38,168)
Balance at Jun. 30, 2015	$ 70,077	$ 2,030,732	$ 1,254,057	$ 3,026	$ (607)	$ 3,357,285
Balance (in Shares) at Jun. 30, 2015	70,076,778

Consolidated Statements of Cha7

Consolidated Statements of Changes in Shareholders' Equity [Unaudited] (Parentheticals) - $ / shares	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Common Stock [Member]
Cash dividends declared, per share	$ 0.5450	$ 0.4800

Consolidated Statements of Cash

Consolidated Statements of Cash Flows [Unaudited] - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 145,573	$ 142,643
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and core deposit intangibles amortization	11,215	11,398
Provision for credit losses	1,750	6,925
Net amortization of premium on investments	29,611	25,118
Gain on sale of other real estate	(18)	(1,344)
Gain on sale of assets	(1,649)	(4,611)
Net accretion of discount on loans	(33,249)	(38,827)
Net accretion of discount on deposits	(640)
Gain on sale of loans	(2,565)	(1,724)
Proceeds from sale of loans held for sale	107,027	82,292
Originations of loans held for sale	(106,342)	(86,766)
Stock based compensation expense	5,690	3,709
Decrease (increase) in accrued interest receivable and other assets	14,699	(6,734)
Increase in accrued interest payable and other liabilities	25,370	62,376
Net cash provided by operating activities	196,472	194,455
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities and principal paydowns of held to maturity securities	818,864	1,541,089
Purchase of held to maturity securities	(1,522,964)	(2,146,700)
Proceeds from maturities and principal paydowns of available for sale securities	1,831,103	1,324,817
Purchase of available for sale securities	(1,810,000)	(1,300,000)
Net decrease in loans held for investment	161,954	109,517
Purchase of bank premises and equipment	(5,400)	(6,709)
Proceeds from sale of bank premises, equipment and other real estate	6,418	20,874
Net cash and cash equivalents acquired in the purchase of F&M Bancorporation Inc.		487,599
Net cash (used in) provided by investing activities	(520,025)	30,487
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in noninterest-bearing deposits	104,208	161,455
Net decrease in interest-bearing deposits	(795,062)	(437,594)
Net proceeds from other short-term borrowings	880,000	190,000
Repayments of other long-term borrowings	(1,983)	(479)
Net increase in securities sold under repurchase agreements	18,666	23,985
Redemption of junior subordinated debentures	(167,531)
Proceeds from stock option exercises	67	2,415
Payments of cash dividends	(38,168)	(32,631)
Net cash provided by (used in) financing activities	197	(92,849)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(323,356)	132,093
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	677,854	381,390
CASH AND CASH EQUIVALENTS, END OF PERIOD	354,498	513,483
NONCASH ACTIVITIES:
Stock issued in connection with the F&M Bancorporation Inc. acquisition		218,164
Acquisition of real estate through foreclosure of collateral	1,166	4,401
SUPPLEMENTAL INFORMATION:
Income taxes paid	42,580	50,843
Interest paid	$ 21,517	$ 24,153

Note 1 - Basis of Presentation

Note 1 - Basis of Presentation	6 Months Ended
	Jun. 30, 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 U.S. generally accepted accounting principles (“GAAP”) 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 U.S. GAAP for complete financial statements. In the opinion of management, the statements reflect all adjustments necessary for a fair presentation of the financial position, results of operations and cash flows of the Company on a consolidated basis, and all such adjustments are of a normal recurring nature. These financial statements and the notes thereto should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2014. Operating results for the six-month period ended June 30, 2015 are not necessarily indicative of the results that may be expected for the year ending December 31, 2015 or any other period.

Note 2 - Income Per Common Shar

Note 2 - Income Per Common Share	6 Months Ended
	Jun. 30, 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 June 30, Six Months Ended June 30, 2015 2014 2015 2014 Per Share Per Share Per Share Per Share Amount Amount Amount Amount Amount Amount Amount Amount (Amounts in thousands, except per share data) Net income $ 71,932 $ 75,506 $ 145,573 $ 142,643 Basic: Weighted average shares outstanding 70,037 $ 1.03 69,667 $ 1.08 70,035 $ 2.08 67,936 $ 2.10 Diluted: Add incremental shares for: Effect of dilutive securities - options 16 61 19 78 Total 70,053 $ 1.03 69,728 $ 1.08 70,054 $ 2.08 68,014 $ 2.10 There were no stock options exercisable during the three and six months ended June 30, 2015 or 2014 that would have had an anti-dilutive effect on the above computation.

Note 3 - New Accounting Standar

Note 3 - New Accounting Standards	6 Months Ended
	Jun. 30, 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 2014-1 2 “ 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 . 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 2014-09 “Revenue from Contract with Customers (Topic 606).” ASU 2014-04 “ Receivables—Troubled Debt Restructurings by Creditors (Subtopic 310-40) — Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure .”

Note 4 - Securities

Note 4 - Securities	6 Months Ended
	Jun. 30, 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: June 30, 2015 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value (Dollars in thousands) Available for Sale States and political subdivisions $ 9,207 $ 65 $ - $ 9,272 Collateralized mortgage obligations 29,824 103 (10 ) 29,917 Mortgage-backed securities 66,955 4,380 (12 ) 71,323 Other securities 12,588 160 (31 ) 12,717 Total $ 118,574 $ 4,708 $ (53 ) $ 123,229 Held to Maturity U.S. Treasury securities and obligations of U.S. Government agencies $ 51,936 $ 971 $ (1 ) $ 52,906 States and political subdivisions 388,356 5,335 (1,319 ) 392,372 Collateralized mortgage obligations 7,899 62 (3 ) 7,958 Mortgage-backed securities 9,126,659 92,646 (79,716 ) 9,139,589 Total $ 9,574,850 $ 99,014 $ (81,039 ) $ 9,592,825 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 June 30, 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 June 30, 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: June 30, 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 $ - $ - $ 5,298 $ (10 ) $ 5,298 $ (10 ) Mortgage-backed securities 155 - 2,692 (12 ) 2,847 (12 ) Other securities 1,706 (31 ) - - 1,706 (31 ) Total $ 1,861 $ (31 ) $ 7,990 $ (22 ) $ 9,851 $ (53 ) Held to Maturity U.S. Treasury securities and obligations of U.S. Government agencies $ 500 $ (1 ) $ - $ - $ 500 $ (1 ) States and political subdivisions 45,734 (245 ) 53,902 (1,074 ) 99,636 (1,319 ) Collateralized mortgage obligations - - 296 (3 ) 296 (3 ) Mortgage-backed securities 2,728,331 (32,930 ) 1,786,337 (46,786 ) 4,514,668 (79,716 ) Total $ 2,774,565 $ (33,176 ) $ 1,840,535 $ (47,863 ) $ 4,615,100 $ (81,039 ) 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 June 30, 2015 and December 31, 2014, there were 487 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 June 30, 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 $ 35,523 $ 35,597 $ 12,688 $ 12,818 Due after one year through five years 185,036 186,467 4,618 4,644 Due after five years through ten years 162,059 165,223 3,859 3,894 Due after ten years 57,674 57,991 630 633 Subtotal 440,292 445,278 21,795 21,989 Mortgage-backed securities and collateralized mortgage obligations 9,134,558 9,147,547 96,779 101,240 Total $ 9,574,850 $ 9,592,825 $ 118,574 $ 123,229 The Company recorded no gain or loss on sale of securities for the three and six months ended June 30, 2015 and 2014. As of June 30, 2015, the Company did not own any non-agency collateralized mortgage obligations. At June 30, 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 $4.88 billion and $5.08 billion and a fair value of $4.89 billion and $5.10 billion at June 30, 2015 and December 31, 2014, respectively, were pledged to collateralize public deposits and for other purposes required or permitted by law.

Note 5 - Loans and Allowance fo

Note 5 - Loans and Allowance for Credit Losses	6 Months Ended
	Jun. 30, 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: June 30, December 31, 2015 2014 (Dollars in thousands) Residential mortgage loans held for sale $ 10,482 $ 8,602 Commercial and industrial 1,654,517 1,806,267 Real estate: Construction, land development and other land loans 1,068,056 1,026,475 1-4 family residential (including home equity) 2,552,170 2,513,579 Commercial real estate (including multi-family residential) 2,958,239 3,030,340 Farmland 399,654 361,943 Agriculture 201,091 189,703 Consumer and other 270,126 307,274 Total loans held for investment 9,103,853 9,235,581 Total $ 9,114,335 $ 9,244,183 (i) Commercial and Industrial Loans . (ii) Commercial Real Estate (iii) 1-4 Family Residential Loans . (iv) Construction, Land Development and Other Land Loans. (v) Agriculture Loans . (vi) Consumer 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. Foreign Loans. Related Party Loans. An analysis of activity with respect to these related party loans is as follows: June 30, December 31, 2015 2014 (Dollars in thousands) Beginning balance on January 1 $ 4,940 $ 6,187 New loans 174 4,913 Repayments and reclassified related loans (1,161 ) (6,160 ) Ending balance $ 3,953 $ 4,940 Nonperforming Assets and Nonaccrual and Past Due Loans. 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: June 30, 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 $ 2,896 $ 153 $ 3,049 $ 421 $ 1,064,586 $ 1,068,056 Agriculture and agriculture real estate (includes farmland) 728 - 728 605 599,412 600,745 1-4 family (includes home equity) (1) 2,456 - 2,456 2,987 2,557,209 2,562,652 Commercial real estate (includes multi-family residential) 5,640 - 5,640 7,536 2,945,063 2,958,239 Commercial and industrial 16,615 - 16,615 20,164 1,617,738 1,654,517 Consumer and other 302 - 302 274 269,550 270,126 Total $ 28,637 $ 153 $ 28,790 $ 31,987 $ 9,053,558 $ 9,114,335 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 $10.5 million and $8.6 million of residential mortgage loans held for sale at June 30, 2015 and December 31, 2014, respectively. The following table presents information regarding nonperforming assets as of the dates indicated: June 30, December 31, 2015 2014 (Dollars in thousands) Nonaccrual loans (1) $ 31,987 $ 31,422 Accruing loans 90 or more days past due 153 2,193 Total nonperforming loans 32,140 33,615 Repossessed assets 173 67 Other real estate 2,806 3,237 Total nonperforming assets $ 35,119 $ 36,919 Nonperforming assets to total loans and other real estate 0.39 % 0.40 % (1) Includes troubled debt restructurings of $661 thousand and $911 thousand as of June 30, 2015 and December 31, 2014, respectively. The Company had $35.1 million in nonperforming assets at June 30, 2015 compared with $36.9 million at December 31, 2014, of which $30.3 million and $30.7 million, respectively, were originated by acquired banks. 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 $1.6 million and $483 thousand would have been recorded as income for the six months ended June 30, 2015 and 2014, respectively. Acquired Loans. 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. June 30, December 31, 2015 2014 (Dollars in thousands) PCI loans: Outstanding balance $ 94,601 $ 129,412 Less: discount 48,277 72,270 Recorded investment $ 46,324 $ 57,142 Changes in the accretable yield for acquired PCI loans as of the three and six months ended June 30, 2015 and 2014 were as follows: Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 (Dollars in thousands) Balance at beginning of period $ 7,870 $ 8,470 $ 9,867 $ 9,855 Additions - 7,158 - 7,158 Reclassifications from nonaccretable 1,695 4,532 8,632 6,035 Accretion (3,214 ) (5,471 ) (12,148 ) (8,359 ) Balance at June 30 $ 6,351 $ 14,689 $ 6,351 $ 14,689 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 . June 30, December 31, 2015 2014 (Dollars in thousands) Non-PCI loans: Outstanding balance $ 1,727,123 $ 2,186,111 Less: discount 67,895 89,105 Recorded investment $ 1,659,228 $ 2,097,006 Changes in the discount accretion for Non-PCI loans for the three and six months ended June 30, 2015 and December 31, 2014 were as follows: Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 (Dollars in thousands) Balance at beginning of period $ 78,289 $ 77,163 $ 89,105 $ 87,798 Additions - 66,059 - 66,059 Accretion charge-offs (6 ) (14 ) (109 ) (62 ) Accretion (10,388 ) (19,881 ) (21,101 ) (30,468 ) Balance at June 30 $ 67,895 $ 123,327 $ 67,895 $ 123,327 Impaired Loans. 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. June 30, 2015 Unpaid Contractual Average Recorded Principal Related Recorded Investment Balance Allowance Investment (Dollars in thousands) With no related allowance recorded: Construction, land development and other land loans $ 156 $ 159 $ - $ 204 Agriculture and agriculture real estate (includes farmland) 545 551 - 276 1-4 family (includes home equity) 1,858 2,005 - 1,857 Commercial real estate (includes multi-family residential) 5,560 5,606 - 5,350 Commercial and industrial 6,845 7,577 - 8,531 Consumer and other 62 62 - 4,103 Total 15,026 15,960 - 20,321 With an allowance recorded: Construction, land development and other land loans 273 466 185 371 Agriculture and agriculture real estate (includes farmland) 11 19 11 33 1-4 family (includes home equity) 1,093 1,136 243 1,281 Commercial real estate (includes multi-family residential) 1,847 3,442 743 1,752 Commercial and industrial 6,724 6,787 2,004 4,621 Consumer and other 205 243 87 238 Total 10,153 12,093 3,273 8,296 Total: Construction, land development and other land loans 429 625 185 575 Agriculture and agriculture real estate (includes farmland) 556 570 11 309 1-4 family (includes home equity) 2,951 3,141 243 3,138 Commercial real estate (includes multi-family residential) 7,407 9,048 743 7,102 Commercial and industrial 13,569 14,364 2,004 13,152 Consumer and other 267 305 87 4,341 $ 25,179 $ 28,053 $ 3,273 $ 28,617 December 31, 2014 Unpaid Contractual 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. Grade 1 Grade 2 Grade 3 Grade 4 Grade 5 Grade 6 Grade 7 Grade 8 Grade 9 The following table presents risk grades and PCI loans by category of loan at June 30, 2015. Impaired loans include loans in risk grades 7, 8 and 9. Construction, Agriculture and Commercial Land Agriculture Real 1-4 Family Real Estate Development and Estate (includes (includes (includes Multi- Commercial Consumer and Other Land Loans Farmland) Home Equity) (1) Family Residential) Industrial Other Total (Dollars in thousands) Grade 1 $ 118 $ 12,641 $ - $ 2,127 $ 57,264 $ 44,653 $ 116,803 Grade 2 17,798 5,943 29,016 24,310 25,650 34,552 137,269 Grade 3 1,028,829 544,791 2,470,309 2,713,249 1,326,302 180,176 8,263,656 Grade 4 17,980 26,697 45,416 143,541 124,379 2,998 361,011 Grade 5 113 5,950 2,130 19,033 68,839 7,446 103,511 Grade 6 1,223 3,667 7,105 28,083 20,470 34 60,582 Grade 7 214 556 2,890 7,210 10,319 267 21,456 Grade 8 215 - 61 197 3,250 - 3,723 Grade 9 - - - - - - - PCI Loans (2) 1,566 500 5,725 20,489 18,044 - 46,324 Total $ 1,068,056 $ 600,745 $ 2,562,652 $ 2,958,239 $ 1,654,517 $ 270,126 $ 9,114,335 (1) Includes $10.5 million of residential mortgage loans held for sale at June 30, 2015. (2) Of the total PCI loans, $26.6 million were classifed as substandard at June 30, 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, Agriculture and Commercial Land Agriculture Real 1-4 Family Real Estate Development and Estate (includes (includes (includes Multi- Commercial Consumer and Other Land Loans Farmland) Home Equity) (1) Family Residential) and Industrial 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 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. 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. 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 June 30, 2015, the allowance for credit losses totaled $81.0 million or 0.89% of total loans, including acquired loans with discounts. At December 31, 2014, the allowance for credit losses totaled $80.8 million or 0.87% of total loans, including acquired loans with discounts. The following table details activity in the allowance for credit losses by category of loan for the three and six months ended June 30, 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. 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) Allowance for credit losses: Three Months Ended Balance March 31, 2015 $ 16,858 $ 3,277 $ 16,778 $ 12,538 $ 30,084 $ 1,428 $ 80,963 Provision for credit losses 49 429 (173 ) 578 (907 ) 524 500 Charge-offs - - (31 ) (136 ) (98 ) (744 ) (1,009 ) Recoveries 2 65 19 22 126 284 518 Net charge-offs 2 65 (12 ) (114 ) 28 (460 ) (491 ) Balance June 30, 2015 $ 16,909 $ 3,771 $ 16,593 $ 13,002 $ 29,205 $ 1,492 $ 80,972 Six Months Ended Balance January 1, 2015 $ 15,825 $ 3,722 $ 16,377 $ 12,744 $ 30,002 $ 2,092 $ 80,762 Provision for credit losses 1,227 (94 ) 314 405 (321 ) 219 1,750 Charge-offs (151 ) - (129 ) (179 ) (826 ) (1,473 ) (2,758 ) Recoveries 8 143 31 32 350 654 1,218 Net charge-offs (143 ) 143 (98 ) (147 ) (476 ) (819 ) (1,540 ) Balance June 30, 2015 $ 16,909 $ 3,771 $ 16,593 $ 13,002 $ 29,205 $ 1,492 $ 80,972 Allowance for credit losses: Three Months Ended Balance March 31, 2014 $ 13,600 $ 1,356 $ 18,718 $ 23,371 $ 8,653 $ 1,398 $ 67,096 Provision for credit losses 1,508 (751 ) 593 313 2,240 2,422 6,325 Charge-offs (153 ) (1 ) (523 ) (26 ) (59 ) (879 ) (1,641 ) Recoveries 38 844 117 21 123 343 1,486 Net charge-offs (115 ) 843 (406 ) (5 ) 64 (536 ) (155 ) Balance June 30, 2014 $ 14,993 $ 1,448 $ 18,905 $ 23,679 $ 10,957 $ 3,284 $ 73,266 Six Months Ended Balance January 1, 2014 $ 14,353 $ 1,229 $ 17,046 $ 24,835 $ 8,167 $ 1,652 $ 67,282 Provision for credit losses 738 (705 ) 2,396 (1,091 ) 2,807 2,780 6,925 Charge-offs (155 ) (15 ) (662 ) (128 ) (202 ) (1,924 ) (3,086 ) Recoveries 57 939 125 63 185 776 2,145 Net charge-offs (98 ) 924 (537 ) (65 ) (17 ) (1,148 ) (941 ) Balance June 30, 2014 $ 14,993 $ 1,448 $ 18,905 $ 23,679 $ 10,957 $ 3,284 $ 73,266 The following table details the amount of the allowance for credit losses allocated to each category of loan as of June 30, 2015 , December 31, 2014 and June 30, 2014 , detailed on the basis of the impairment methodology used by the Company. 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) Allowance for credit losses related to: June 30, 2015 Individually evaluated for impairment $ 185 $ 11 $ 243 $ 743 $ 2,004 $ 87 $ 3,273 Collectively evaluated for impairment 16,724 3,760 16,350 12,259 27,038 1,405 77,536 PCI loans - - - - 163 - 163 Total allowance for credit losses $ 16,909 $ 3,771 $ 16,593 $ 13,002 $ 29,205 $ 1,492 $ 80,972 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 June 30, 2014 Individually evaluated for impairment $ - $ 53 $ 249 $ 47 $ 2,887 $ 92 $ 3,328 Collectively evaluated for impairment 14,993 1,395 18,656 23,632 8,070 3,192 69,938 PCI loans - - - - - - - Total allowance for credit losses $ 14,993 $ 1,448 $ 18,905 $ 23,679 $ 10,957 $ 3,284 $ 73,266 The following table details the recorded investment in loans as of June 30, 2015 , December 31, 2014 and June 30, 2014, excluding $10.5 million, $8.6 million and $8.4 million, respectively, of residential mortgage loans held for sale, related to each balance in the allowance for credit 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: June 30, 2015 Individually evaluated for impairment $ 429 $ 556 $ 2,951 $ 7,407 $ 13,569 $ 267 $ 25,179 Collectively evaluated for impairment 1,066,061 599,689 2,543,494 2,930,343 1,622,904 269,859 9,032,350 PCI loans 1,566 500 5,725 20,489 18,044 - 46,324 Total loans evaluated for impairment $ 1,068,056 $ 600,745 $ 2,552,170 $ 2,958,239 $ 1,654,517 $ 270,126 $ 9,103,853 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 June 30, 2014 Individually evaluated for impairment $ 315 $ 75 $ 1,180 $ 937 $ 10,094 $ 127 $ 12,728 Collectively evaluated for impairment 1,001,378 541,703 2,403,165 2,996,361 2,098,292 167,044 9,207,943 PCI loans 3,406 582 8,807 30,647 35,641 - 79,083 Total loans evaluated for impairment $ 1,005,099 $ 542,360 $ 2,413,152 $ 3,027,945 $ 2,144,027 $ 167,171 $ 9,299,754 Troubled Debt Restructurings. Receivables (Topic 310)-A Creditor’s Determination of Whether a Restructuring Is a Troubled Debt Restructuring,” Six Months Ended June 30, 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 15 Consumer and other 1 10 9 - - - Total 1 $ 10 $ 9 2 $ 51 $ 50 As of June 30, 2015, there have been no defaults on any loans that were modified as troubled debt restructurings during the preceding six 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 June 30, 2015 and 2014, the Company had $661 thousand and $1.3 million, respectively, in outstanding troubled debt restructurings. For the six months ended June 30, 2015, the Company added one loan totaling $10 thousand as a new troubled debt restructuring, of which $9 thousand was still outstanding at June 30, 2015. These modifications did not have a material impact on the Company’s determination of the allowance for credit losses.

Note 6 - Fair Value

Note 6 - Fair Value	6 Months Ended
	Jun. 30, 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 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 June 30, 2015 Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets: Available for sale securities: States and political subdivisions $ - $ 9,272 $ - $ 9,272 Collateralized mortgage obligations - 29,917 - 29,917 Mortgage-backed securities - 71,323 - 71,323 Other securities 12,717 - - 12,717 Total $ 12,717 $ 110,512 $ - $ 123,229 Non-hedging interest rate swap $ - $ 368 $ - $ 368 Liabilities: Non-hedging interest rate swap $ - $ (368 ) $ - $ (368 ) 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 and six months ended June 30, 2015, the Company had additions to other real estate owned of $183 thousand and $1.2 million, respectively, of which $183 thousand and $763 thousand, respectively, were outstanding as of June 30, 2015. For the three and six months ended June 30, 2015, the Company had additions to impaired loans of $6.5 million and $8.0 million, respectively, of which $6.5 million and $7.7 million, respectively, were still outstanding as of June 30, 2015. The remaining assets and liabilities measured at fair value on a nonrecurring basis that were recorded in 2015 and remained outstanding at June 30, 2015 were not significant. The following table presents carrying and fair value information of financial instruments as of the dates indicated: As of June 30, 2015 Carrying Estimated Fair Value Amount Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Cash and due from banks $ 353,047 $ 353,047 $ - $ - $ 353,047 Federal funds sold 1,451 1,451 - - 1,451 Held to maturity securities 9,574,850 - 9,592,825 - 9,592,825 Loans held for sale 10,482 - 10,482 - 10,482 Loans held for investment, net of allowance 9,022,881 - - 9,068,305 9,068,305 Other real estate owned 2,806 - 2,806 - 2,806 Liabilities Deposits: Noninterest-bearing $ 5,040,628 $ - $ 5,040,628 $ - $ 5,040,628 Interest-bearing 11,961,036 - 11,969,183 - 11,969,183 Other borrowings 886,741 - 887,556 - 887,556 Securities sold under repurchase agreements 334,189 - 334,207 - 334,207 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 Federal funds sold 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 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 Deposits Other borrowings Securities sold under repurchase agreements Junior subordinated debentures Derivative financial instruments Off-balance sheet financial instruments The fair value estimates presented herein are based on pertinent information available to management at June 30, 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.

Note 7 - Goodwill and Core Depo

Note 7 - Goodwill and Core Deposit Intangibles	6 Months Ended
	Jun. 30, 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 six months ended June 30, 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 - (4,879 ) Add: Measurement period adjustments 7,764 - Balance as of June 30, 2015 $ 1,881,955 $ 54,068 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 June 30, 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 $2.4 million and $2.6 million for the three months ended June 30, 2015 and 2014, respectively, and $4.9 million and $4.7 million for the six months ended June 30, 2015 and 2014, respectively. The estimated aggregate future amortization expense for CDI remaining as of June 30, 2015 is as follows (dollars in thousands): Remaining 2015 $ 4,651 2016 8,519 2017 6,327 2018 5,400 2019 4,546 Thereafter 24,625 Total $ 54,068

Note 8 - Stock Based Compensati

Note 8 - Stock Based Compensation	6 Months Ended
	Jun. 30, 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 June 30, 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 300,943 shares have been granted under the 2012 Plan as of June 30, 2015. The Company received $67 thousand and $576 thousand from the exercise of stock options for the three month periods ended June 30, 2015 and 2014, respectively, and $67 thousand and $2.4 million during the six month periods ended June 30, 2015 and 2014, respectively. There was no tax benefit realized from option exercises of the share-based payment arrangements during the three and six month periods ended June 30, 2015 and 2014. As of June 30, 2015, there was $26.3 million of total unrecognized compensation expense related to stock-based compensation arrangements. That cost is expected to be recognized over a weighted average period of 2.19 years.

Note 9 - Contractual Obigations

Note 9 - Contractual Obigations and Off-Balance Sheet Items	6 Months Ended
	Jun. 30, 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 June 30, 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 June 30, 2015 are summarized below. Payments for FHLB borrowings include interest of $1.2 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 $ 881,056 $ 1,843 $ 4,417 $ 650 $ 887,966 Operating leases 6,268 8,319 3,898 7,321 25,806 Total $ 887,324 $ 10,162 $ 8,315 $ 7,971 $ 913,772 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 June 30, 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 $ 84,099 $ 16,570 $ 1,136 $ - $ 101,805 Commitments to extend credit 1,082,493 309,405 40,698 429,991 1,862,587 Total $ 1,166,592 $ 325,975 $ 41,834 $ 429,991 $ 1,964,392

Note 10 - Other Comprehensive (

Note 10 - Other Comprehensive (Loss) Income	6 Months Ended
	Jun. 30, 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 June 30, 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 during period $ (640 ) $ 224 $ (416 ) $ (317 ) $ 111 $ (206 ) Total securities available for sale (640 ) 224 (416 ) (317 ) 111 (206 ) Total other comprehensive loss $ (640 ) $ 224 $ (416 ) $ (317 ) $ 111 $ (206 ) Six Months Ended June 30, 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 during period $ (1,082 ) $ 379 $ (703 ) $ (806 ) $ 282 $ (524 ) Total securities available for sale (1,082 ) 379 $ (703 ) (806 ) 282 (524 ) Total other comprehensive loss $ (1,082 ) $ 379 $ (703 ) $ (806 ) $ 282 $ (524 ) 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 (703 ) (703 ) Balance at June 30, 2015 $ 3,026 $ 3,026 Balance at January 1, 2014 $ 4,883 $ 4,883 Other comprehensive loss (524 ) (524 ) Balance at June 30, 2014 $ 4,359 $ 4,359

Note 11 - Acquisitions

Note 11 - Acquisitions	6 Months Ended
	Jun. 30, 2015
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	11. ACQUISITIONS Acquisition of F&M Bancorporation Inc. – 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 June 30, 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.

Note 12 - Subsequent Events

Note 12 - Subsequent Events	6 Months Ended
	Jun. 30, 2015
Subsequent Events [Abstract]
Subsequent Events [Text Block]	12. SUBSEQUENT EVENTS Pending Acquisition of Tradition Bancshares, Inc. –

Accounting Policies, by Policy

Accounting Policies, by Policy (Policies)	6 Months Ended
	Jun. 30, 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 2014-1 2 “ 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 . 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 2014-09 “Revenue from Contract with Customers (Topic 606).” ASU 2014-04 “ Receivables—Troubled Debt Restructurings by Creditors (Subtopic 310-40) — Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure .”

Note 2 - Income Per Common Sh22

Note 2 - Income Per Common Share (Tables)	6 Months Ended
	Jun. 30, 2015
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 Per Share Per Share Per Share Per Share Amount Amount Amount Amount Amount Amount Amount Amount (Amounts in thousands, except per share data) Net income $ 71,932 $ 75,506 $ 145,573 $ 142,643 Basic: Weighted average shares outstanding 70,037 $ 1.03 69,667 $ 1.08 70,035 $ 2.08 67,936 $ 2.10 Diluted: Add incremental shares for: Effect of dilutive securities - options 16 61 19 78 Total 70,053 $ 1.03 69,728 $ 1.08 70,054 $ 2.08 68,014 $ 2.10

Note 4 - Securities (Tables)

Note 4 - Securities (Tables)	6 Months Ended
	Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Marketable Securities [Table Text Block]	June 30, 2015 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value (Dollars in thousands) Available for Sale States and political subdivisions $ 9,207 $ 65 $ - $ 9,272 Collateralized mortgage obligations 29,824 103 (10 ) 29,917 Mortgage-backed securities 66,955 4,380 (12 ) 71,323 Other securities 12,588 160 (31 ) 12,717 Total $ 118,574 $ 4,708 $ (53 ) $ 123,229 Held to Maturity U.S. Treasury securities and obligations of U.S. Government agencies $ 51,936 $ 971 $ (1 ) $ 52,906 States and political subdivisions 388,356 5,335 (1,319 ) 392,372 Collateralized mortgage obligations 7,899 62 (3 ) 7,958 Mortgage-backed securities 9,126,659 92,646 (79,716 ) 9,139,589 Total $ 9,574,850 $ 99,014 $ (81,039 ) $ 9,592,825 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]	June 30, 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 $ - $ - $ 5,298 $ (10 ) $ 5,298 $ (10 ) Mortgage-backed securities 155 - 2,692 (12 ) 2,847 (12 ) Other securities 1,706 (31 ) - - 1,706 (31 ) Total $ 1,861 $ (31 ) $ 7,990 $ (22 ) $ 9,851 $ (53 ) Held to Maturity U.S. Treasury securities and obligations of U.S. Government agencies $ 500 $ (1 ) $ - $ - $ 500 $ (1 ) States and political subdivisions 45,734 (245 ) 53,902 (1,074 ) 99,636 (1,319 ) Collateralized mortgage obligations - - 296 (3 ) 296 (3 ) Mortgage-backed securities 2,728,331 (32,930 ) 1,786,337 (46,786 ) 4,514,668 (79,716 ) Total $ 2,774,565 $ (33,176 ) $ 1,840,535 $ (47,863 ) $ 4,615,100 $ (81,039 ) 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 $ 35,523 $ 35,597 $ 12,688 $ 12,818 Due after one year through five years 185,036 186,467 4,618 4,644 Due after five years through ten years 162,059 165,223 3,859 3,894 Due after ten years 57,674 57,991 630 633 Subtotal 440,292 445,278 21,795 21,989 Mortgage-backed securities and collateralized mortgage obligations 9,134,558 9,147,547 96,779 101,240 Total $ 9,574,850 $ 9,592,825 $ 118,574 $ 123,229

Note 5 - Loans and Allowance 24

Note 5 - Loans and Allowance for Credit Losses (Tables)	6 Months Ended
	Jun. 30, 2015
Loans And Allowance For Credit Losses [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	June 30, December 31, 2015 2014 (Dollars in thousands) Residential mortgage loans held for sale $ 10,482 $ 8,602 Commercial and industrial 1,654,517 1,806,267 Real estate: Construction, land development and other land loans 1,068,056 1,026,475 1-4 family residential (including home equity) 2,552,170 2,513,579 Commercial real estate (including multi-family residential) 2,958,239 3,030,340 Farmland 399,654 361,943 Agriculture 201,091 189,703 Consumer and other 270,126 307,274 Total loans held for investment 9,103,853 9,235,581 Total $ 9,114,335 $ 9,244,183
Schedule of Related Party Loans [Table Text Block]	June 30, December 31, 2015 2014 (Dollars in thousands) Beginning balance on January 1 $ 4,940 $ 6,187 New loans 174 4,913 Repayments and reclassified related loans (1,161 ) (6,160 ) Ending balance $ 3,953 $ 4,940
Past Due Financing Receivables [Table Text Block]	June 30, 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 $ 2,896 $ 153 $ 3,049 $ 421 $ 1,064,586 $ 1,068,056 Agriculture and agriculture real estate (includes farmland) 728 - 728 605 599,412 600,745 1-4 family (includes home equity) (1) 2,456 - 2,456 2,987 2,557,209 2,562,652 Commercial real estate (includes multi-family residential) 5,640 - 5,640 7,536 2,945,063 2,958,239 Commercial and industrial 16,615 - 16,615 20,164 1,617,738 1,654,517 Consumer and other 302 - 302 274 269,550 270,126 Total $ 28,637 $ 153 $ 28,790 $ 31,987 $ 9,053,558 $ 9,114,335 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]	June 30, December 31, 2015 2014 (Dollars in thousands) Nonaccrual loans (1) $ 31,987 $ 31,422 Accruing loans 90 or more days past due 153 2,193 Total nonperforming loans 32,140 33,615 Repossessed assets 173 67 Other real estate 2,806 3,237 Total nonperforming assets $ 35,119 $ 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]	June 30, December 31, 2015 2014 (Dollars in thousands) PCI loans: Outstanding balance $ 94,601 $ 129,412 Less: discount 48,277 72,270 Recorded investment $ 46,324 $ 57,142
Summary of Changes in Accretable Yields of Acquired Loans [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 (Dollars in thousands) Balance at beginning of period $ 7,870 $ 8,470 $ 9,867 $ 9,855 Additions - 7,158 - 7,158 Reclassifications from nonaccretable 1,695 4,532 8,632 6,035 Accretion (3,214 ) (5,471 ) (12,148 ) (8,359 ) Balance at June 30 $ 6,351 $ 14,689 $ 6,351 $ 14,689
Carrying Value and Outstanding Balance for Non Purchased Credit Impaired Loans [Table Text Block]	June 30, December 31, 2015 2014 (Dollars in thousands) Non-PCI loans: Outstanding balance $ 1,727,123 $ 2,186,111 Less: discount 67,895 89,105 Recorded investment $ 1,659,228 $ 2,097,006
Summary of Changes in Accretable Yields of Acquired Non PCI Loans[TableText Block]	Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 (Dollars in thousands) Balance at beginning of period $ 78,289 $ 77,163 $ 89,105 $ 87,798 Additions - 66,059 - 66,059 Accretion charge-offs (6 ) (14 ) (109 ) (62 ) Accretion (10,388 ) (19,881 ) (21,101 ) (30,468 ) Balance at June 30 $ 67,895 $ 123,327 $ 67,895 $ 123,327
Impaired Financing Receivables [Table Text Block]	June 30, 2015 Unpaid Contractual Average Recorded Principal Related Recorded Investment Balance Allowance Investment (Dollars in thousands) With no related allowance recorded: Construction, land development and other land loans $ 156 $ 159 $ - $ 204 Agriculture and agriculture real estate (includes farmland) 545 551 - 276 1-4 family (includes home equity) 1,858 2,005 - 1,857 Commercial real estate (includes multi-family residential) 5,560 5,606 - 5,350 Commercial and industrial 6,845 7,577 - 8,531 Consumer and other 62 62 - 4,103 Total 15,026 15,960 - 20,321 With an allowance recorded: Construction, land development and other land loans 273 466 185 371 Agriculture and agriculture real estate (includes farmland) 11 19 11 33 1-4 family (includes home equity) 1,093 1,136 243 1,281 Commercial real estate (includes multi-family residential) 1,847 3,442 743 1,752 Commercial and industrial 6,724 6,787 2,004 4,621 Consumer and other 205 243 87 238 Total 10,153 12,093 3,273 8,296 Total: Construction, land development and other land loans 429 625 185 575 Agriculture and agriculture real estate (includes farmland) 556 570 11 309 1-4 family (includes home equity) 2,951 3,141 243 3,138 Commercial real estate (includes multi-family residential) 7,407 9,048 743 7,102 Commercial and industrial 13,569 14,364 2,004 13,152 Consumer and other 267 305 87 4,341 $ 25,179 $ 28,053 $ 3,273 $ 28,617 December 31, 2014 Unpaid Contractual 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 1-4 Family Real Estate Development and Estate (includes (includes (includes Multi- Commercial Consumer and Other Land Loans Farmland) Home Equity) (1) Family Residential) Industrial Other Total (Dollars in thousands) Grade 1 $ 118 $ 12,641 $ - $ 2,127 $ 57,264 $ 44,653 $ 116,803 Grade 2 17,798 5,943 29,016 24,310 25,650 34,552 137,269 Grade 3 1,028,829 544,791 2,470,309 2,713,249 1,326,302 180,176 8,263,656 Grade 4 17,980 26,697 45,416 143,541 124,379 2,998 361,011 Grade 5 113 5,950 2,130 19,033 68,839 7,446 103,511 Grade 6 1,223 3,667 7,105 28,083 20,470 34 60,582 Grade 7 214 556 2,890 7,210 10,319 267 21,456 Grade 8 215 - 61 197 3,250 - 3,723 Grade 9 - - - - - - - PCI Loans (2) 1,566 500 5,725 20,489 18,044 - 46,324 Total $ 1,068,056 $ 600,745 $ 2,562,652 $ 2,958,239 $ 1,654,517 $ 270,126 $ 9,114,335 Construction, Agriculture and Commercial Land Agriculture Real 1-4 Family Real Estate Development and Estate (includes (includes (includes Multi- Commercial Consumer and Other Land Loans Farmland) Home Equity) (1) Family Residential) and Industrial 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]	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) Allowance for credit losses: Three Months Ended Balance March 31, 2015 $ 16,858 $ 3,277 $ 16,778 $ 12,538 $ 30,084 $ 1,428 $ 80,963 Provision for credit losses 49 429 (173 ) 578 (907 ) 524 500 Charge-offs - - (31 ) (136 ) (98 ) (744 ) (1,009 ) Recoveries 2 65 19 22 126 284 518 Net charge-offs 2 65 (12 ) (114 ) 28 (460 ) (491 ) Balance June 30, 2015 $ 16,909 $ 3,771 $ 16,593 $ 13,002 $ 29,205 $ 1,492 $ 80,972 Six Months Ended Balance January 1, 2015 $ 15,825 $ 3,722 $ 16,377 $ 12,744 $ 30,002 $ 2,092 $ 80,762 Provision for credit losses 1,227 (94 ) 314 405 (321 ) 219 1,750 Charge-offs (151 ) - (129 ) (179 ) (826 ) (1,473 ) (2,758 ) Recoveries 8 143 31 32 350 654 1,218 Net charge-offs (143 ) 143 (98 ) (147 ) (476 ) (819 ) (1,540 ) Balance June 30, 2015 $ 16,909 $ 3,771 $ 16,593 $ 13,002 $ 29,205 $ 1,492 $ 80,972 Allowance for credit losses: Three Months Ended Balance March 31, 2014 $ 13,600 $ 1,356 $ 18,718 $ 23,371 $ 8,653 $ 1,398 $ 67,096 Provision for credit losses 1,508 (751 ) 593 313 2,240 2,422 6,325 Charge-offs (153 ) (1 ) (523 ) (26 ) (59 ) (879 ) (1,641 ) Recoveries 38 844 117 21 123 343 1,486 Net charge-offs (115 ) 843 (406 ) (5 ) 64 (536 ) (155 ) Balance June 30, 2014 $ 14,993 $ 1,448 $ 18,905 $ 23,679 $ 10,957 $ 3,284 $ 73,266 Six Months Ended Balance January 1, 2014 $ 14,353 $ 1,229 $ 17,046 $ 24,835 $ 8,167 $ 1,652 $ 67,282 Provision for credit losses 738 (705 ) 2,396 (1,091 ) 2,807 2,780 6,925 Charge-offs (155 ) (15 ) (662 ) (128 ) (202 ) (1,924 ) (3,086 ) Recoveries 57 939 125 63 185 776 2,145 Net charge-offs (98 ) 924 (537 ) (65 ) (17 ) (1,148 ) (941 ) Balance June 30, 2014 $ 14,993 $ 1,448 $ 18,905 $ 23,679 $ 10,957 $ 3,284 $ 73,266 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) Allowance for credit losses related to: June 30, 2015 Individually evaluated for impairment $ 185 $ 11 $ 243 $ 743 $ 2,004 $ 87 $ 3,273 Collectively evaluated for impairment 16,724 3,760 16,350 12,259 27,038 1,405 77,536 PCI loans - - - - 163 - 163 Total allowance for credit losses $ 16,909 $ 3,771 $ 16,593 $ 13,002 $ 29,205 $ 1,492 $ 80,972 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 June 30, 2014 Individually evaluated for impairment $ - $ 53 $ 249 $ 47 $ 2,887 $ 92 $ 3,328 Collectively evaluated for impairment 14,993 1,395 18,656 23,632 8,070 3,192 69,938 PCI loans - - - - - - - Total allowance for credit losses $ 14,993 $ 1,448 $ 18,905 $ 23,679 $ 10,957 $ 3,284 $ 73,266 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: June 30, 2015 Individually evaluated for impairment $ 429 $ 556 $ 2,951 $ 7,407 $ 13,569 $ 267 $ 25,179 Collectively evaluated for impairment 1,066,061 599,689 2,543,494 2,930,343 1,622,904 269,859 9,032,350 PCI loans 1,566 500 5,725 20,489 18,044 - 46,324 Total loans evaluated for impairment $ 1,068,056 $ 600,745 $ 2,552,170 $ 2,958,239 $ 1,654,517 $ 270,126 $ 9,103,853 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 June 30, 2014 Individually evaluated for impairment $ 315 $ 75 $ 1,180 $ 937 $ 10,094 $ 127 $ 12,728 Collectively evaluated for impairment 1,001,378 541,703 2,403,165 2,996,361 2,098,292 167,044 9,207,943 PCI loans 3,406 582 8,807 30,647 35,641 - 79,083 Total loans evaluated for impairment $ 1,005,099 $ 542,360 $ 2,413,152 $ 3,027,945 $ 2,144,027 $ 167,171 $ 9,299,754
Troubled Debt Restructurings on Financing Receivables [Table Text Block]	Six Months Ended June 30, 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 15 Consumer and other 1 10 9 - - - Total 1 $ 10 $ 9 2 $ 51 $ 50

Note 6 - Fair Value (Tables)

Note 6 - Fair Value (Tables)	6 Months Ended
	Jun. 30, 2015
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	As of June 30, 2015 Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets: Available for sale securities: States and political subdivisions $ - $ 9,272 $ - $ 9,272 Collateralized mortgage obligations - 29,917 - 29,917 Mortgage-backed securities - 71,323 - 71,323 Other securities 12,717 - - 12,717 Total $ 12,717 $ 110,512 $ - $ 123,229 Non-hedging interest rate swap $ - $ 368 $ - $ 368 Liabilities: Non-hedging interest rate swap $ - $ (368 ) $ - $ (368 ) 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 June 30, 2015 Carrying Estimated Fair Value Amount Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Cash and due from banks $ 353,047 $ 353,047 $ - $ - $ 353,047 Federal funds sold 1,451 1,451 - - 1,451 Held to maturity securities 9,574,850 - 9,592,825 - 9,592,825 Loans held for sale 10,482 - 10,482 - 10,482 Loans held for investment, net of allowance 9,022,881 - - 9,068,305 9,068,305 Other real estate owned 2,806 - 2,806 - 2,806 Liabilities Deposits: Noninterest-bearing $ 5,040,628 $ - $ 5,040,628 $ - $ 5,040,628 Interest-bearing 11,961,036 - 11,969,183 - 11,969,183 Other borrowings 886,741 - 887,556 - 887,556 Securities sold under repurchase agreements 334,189 - 334,207 - 334,207 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

Note 7 - Goodwill and Core De26

Note 7 - Goodwill and Core Deposit Intangibles (Tables)	6 Months Ended
	Jun. 30, 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 - (4,879 ) Add: Measurement period adjustments 7,764 - Balance as of June 30, 2015 $ 1,881,955 $ 54,068
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Remaining 2015 $ 4,651 2016 8,519 2017 6,327 2018 5,400 2019 4,546 Thereafter 24,625 Total $ 54,068

Note 9 - Contractual Obigatio27

Note 9 - Contractual Obigations and Off-Balance Sheet Items (Tables)	6 Months Ended
	Jun. 30, 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 $ 881,056 $ 1,843 $ 4,417 $ 650 $ 887,966 Operating leases 6,268 8,319 3,898 7,321 25,806 Total $ 887,324 $ 10,162 $ 8,315 $ 7,971 $ 913,772
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 $ 84,099 $ 16,570 $ 1,136 $ - $ 101,805 Commitments to extend credit 1,082,493 309,405 40,698 429,991 1,862,587 Total $ 1,166,592 $ 325,975 $ 41,834 $ 429,991 $ 1,964,392

Note 10 - Other Comprehensive28

Note 10 - Other Comprehensive (Loss) Income (Tables)	6 Months Ended
	Jun. 30, 2015
Disclosure Text Block [Abstract]
Comprehensive Income (Loss) [Table Text Block]	Three Months Ended June 30, 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 during period $ (640 ) $ 224 $ (416 ) $ (317 ) $ 111 $ (206 ) Total securities available for sale (640 ) 224 (416 ) (317 ) 111 (206 ) Total other comprehensive loss $ (640 ) $ 224 $ (416 ) $ (317 ) $ 111 $ (206 ) Six Months Ended June 30, 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 during period $ (1,082 ) $ 379 $ (703 ) $ (806 ) $ 282 $ (524 ) Total securities available for sale (1,082 ) 379 $ (703 ) (806 ) 282 (524 ) Total other comprehensive loss $ (1,082 ) $ 379 $ (703 ) $ (806 ) $ 282 $ (524 )
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 (703 ) (703 ) Balance at June 30, 2015 $ 3,026 $ 3,026 Balance at January 1, 2014 $ 4,883 $ 4,883 Other comprehensive loss (524 ) (524 ) Balance at June 30, 2014 $ 4,359 $ 4,359

Note 2 - Income Per Common Sh29

Note 2 - Income Per Common Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Employee Stock Option [Member]
Note 2 - Income Per Common Share (Details) [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0	0	0

Note 2 - Income Per Common Sh30

Note 2 - Income Per Common Share (Details) - Computation of Basic and Diluted Earnings Per Share - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Computation of Basic and Diluted Earnings Per Share [Abstract]
Net income (in Dollars)	$ 71,932	$ 75,506	$ 145,573	$ 142,643
Basic:
Weighted average shares outstanding	70,037	69,667	70,035	67,936
Weighted average shares outstanding (in Dollars per share)	$ 1.03	$ 1.08	$ 2.08	$ 2.10
Add incremental shares for:
Effect of dilutive securities - options	16	61	19	78
Total	70,053	69,728	70,054	68,014
Total (in Dollars per share)	$ 1.03	$ 1.08	$ 2.08	$ 2.10

Note 4 - Securities (Details)

Note 4 - Securities (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015USD ($)	Jun. 30, 2014USD ($)	Jun. 30, 2015USD ($)	Jun. 30, 2014USD ($)	Dec. 31, 2014USD ($)
Note 4 - Securities (Details) [Line Items]
Number of Investment Securities Segments			2
Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Securities	487		487		501
Gain (Loss) on Sale of Securities, Net	$ 0	$ 0	$ 0	$ 0
Available-for-sale Securities, Amortized Cost Basis	118,574,000		118,574,000		$ 139,662,000
Available-for-sale Securities	123,229,000		123,229,000		145,399,000
Collateralized Securities [Member]
Note 4 - Securities (Details) [Line Items]
Available-for-sale Securities, Amortized Cost Basis	4,880,000,000		4,880,000,000		5,080,000,000
Available-for-sale Securities	$ 4,890,000,000		$ 4,890,000,000		$ 5,100,000,000
Stockholders' Equity, Total [Member] | Securities Concentration Risk [Member]
Note 4 - Securities (Details) [Line Items]
Concentration Risk, Percentage			0.00%		0.00%

Note 4 - Securities (Details) -

Note 4 - Securities (Details) - Investment Securities - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Available for Sale
Available for sale securities, amortized cost	$ 118,574	$ 139,662
Available for sale securities, gross unrealized gains	4,708	5,819
Available for sale securities, gross unrealized losses	(53)	(82)
Available for sale securities, fair value	123,229	145,399
Held to Maturity
Held to maturity securities, amortized cost	9,574,850	8,900,377
Held to maturity securities, gross unrealized gains	99,014	103,372
Held to maturity securities, gross unrealized losses	(81,039)	(55,057)
Held to maturity securities, fair value	9,592,825	8,948,692
US States and Political Subdivisions Debt Securities [Member]
Available for Sale
Available for sale securities, amortized cost	9,207	14,402
Available for sale securities, gross unrealized gains	65	183
Available for sale securities, fair value	9,272	14,585
Held to Maturity
Held to maturity securities, amortized cost	388,356	404,356
Held to maturity securities, gross unrealized gains	5,335	6,147
Held to maturity securities, gross unrealized losses	(1,319)	(1,422)
Held to maturity securities, fair value	392,372	409,081
Collateralized Mortgage Obligations [Member]
Available for Sale
Available for sale securities, amortized cost	29,824	33,519
Available for sale securities, gross unrealized gains	103	91
Available for sale securities, gross unrealized losses	(10)	(37)
Available for sale securities, fair value	29,917	33,573
Held to Maturity
Held to maturity securities, amortized cost	7,899	19,585
Held to maturity securities, gross unrealized gains	62	215
Held to maturity securities, gross unrealized losses	(3)	(8)
Held to maturity securities, fair value	7,958	19,792
Collateralized Mortgage Backed Securities [Member]
Available for Sale
Available for sale securities, amortized cost	66,955	79,153
Available for sale securities, gross unrealized gains	4,380	5,344
Available for sale securities, gross unrealized losses	(12)	(14)
Available for sale securities, fair value	71,323	84,483
Held to Maturity
Held to maturity securities, amortized cost	9,126,659	8,424,083
Held to maturity securities, gross unrealized gains	92,646	96,650
Held to maturity securities, gross unrealized losses	(79,716)	(53,553)
Held to maturity securities, fair value	9,139,589	8,467,180
Other Debt Obligations [Member]
Available for Sale
Available for sale securities, amortized cost	12,588	12,588
Available for sale securities, gross unrealized gains	160	201
Available for sale securities, gross unrealized losses	(31)	(31)
Available for sale securities, fair value	12,717	12,758
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Held to Maturity
Held to maturity securities, amortized cost	51,936	52,353
Held to maturity securities, gross unrealized gains	971	360
Held to maturity securities, gross unrealized losses	(1)	(74)
Held to maturity securities, fair value	$ 52,906	$ 52,639

Note 4 - Securities (Details)33

Note 4 - Securities (Details) - Securities in a Continuous Loss Position - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Available for Sale
Available for sale, estimated fair value, less than 12 months	$ 1,861	$ 8,739
Available for sale, unrealized losses, less than 12 months	(31)	(67)
Available for sale, estimated fair value, more than 12 months	7,990	2,882
Available for sale, unrealized losses, more than 12 months	(22)	(15)
Available for sale, estimated fair value, total	9,851	11,621
Available for sale, unrealized losses, total	(53)	(82)
Held to Maturity
Held to maturity, estimated fair value, less than 12 months	2,774,565	1,212,828
Held to maturity, unrealized losses, less than 12 months	(33,176)	(3,104)
Held to maturity, estimated fair value, more than 12 months	1,840,535	2,394,225
Held to maturity, unrealized losses, more than 12 months	(47,863)	(51,953)
Held to maturity, estimated fair value, total	4,615,100	3,607,053
Held to maturity, unrealized losses, total	(81,039)	(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	5,298	45
Available for sale, unrealized losses, more than 12 months	(10)	(1)
Available for sale, estimated fair value, total	5,298	6,720
Available for sale, unrealized losses, total	(10)	(37)
Held to Maturity
Held to maturity, estimated fair value, less than 12 months		670
Held to maturity, unrealized losses, less than 12 months		(5)
Held to maturity, estimated fair value, more than 12 months	296	322
Held to maturity, unrealized losses, more than 12 months	(3)	(3)
Held to maturity, estimated fair value, total	296	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	155	358
Available for sale, estimated fair value, more than 12 months	2,692	2,837
Available for sale, unrealized losses, more than 12 months	(12)	(14)
Available for sale, estimated fair value, total	2,847	3,195
Available for sale, unrealized losses, total	(12)	(14)
Held to Maturity
Held to maturity, estimated fair value, less than 12 months	2,728,331	1,149,380
Held to maturity, unrealized losses, less than 12 months	(32,930)	(2,600)
Held to maturity, estimated fair value, more than 12 months	1,786,337	2,349,143
Held to maturity, unrealized losses, more than 12 months	(46,786)	(50,953)
Held to maturity, estimated fair value, total	4,514,668	3,498,523
Held to maturity, unrealized losses, total	(79,716)	(53,553)
Other Debt Obligations [Member]
Available for Sale
Available for sale, estimated fair value, less than 12 months	1,706	1,706
Available for sale, unrealized losses, less than 12 months	(31)	(31)
Available for sale, estimated fair value, total	1,706	1,706
Available for sale, unrealized losses, total	(31)	(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	500	17,098
Held to maturity, unrealized losses, less than 12 months	(1)	(74)
Held to maturity, estimated fair value, total	500	17,098
Held to maturity, unrealized losses, total	(1)	(74)
US States and Political Subdivisions Debt Securities [Member]
Held to Maturity
Held to maturity, estimated fair value, less than 12 months	45,734	45,680
Held to maturity, unrealized losses, less than 12 months	(245)	(425)
Held to maturity, estimated fair value, more than 12 months	53,902	44,760
Held to maturity, unrealized losses, more than 12 months	(1,074)	(997)
Held to maturity, estimated fair value, total	99,636	90,440
Held to maturity, unrealized losses, total	$ (1,319)	$ (1,422)

Note 4 - Securities (Details)34

Note 4 - Securities (Details) - Investment Securities by Contractual Maturity - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Investment Securities by Contractual Maturity [Abstract]
Due in one year or less	$ 35,523
Due in one year or less	35,597
Due in one year or less	12,688
Due in one year or less	12,818
Due after one year through five years	185,036
Due after one year through five years	186,467
Due after one year through five years	4,618
Due after one year through five years	4,644
Due after five years through ten years	162,059
Due after five years through ten years	165,223
Due after five years through ten years	3,859
Due after five years through ten years	3,894
Due after ten years	57,674
Due after ten years	57,991
Due after ten years	630
Due after ten years	633
Subtotal	440,292
Subtotal	445,278
Subtotal	21,795
Subtotal	21,989
Mortgage-backed securities and collateralized mortgage obligations	9,134,558
Mortgage-backed securities and collateralized mortgage obligations	9,147,547
Mortgage-backed securities and collateralized mortgage obligations	96,779
Mortgage-backed securities and collateralized mortgage obligations	101,240
Total	9,574,850	$ 8,900,377
Total	9,592,825	8,948,692
Total	118,574
Total	$ 123,229	$ 145,399

Note 5 - Loans and Allowance 35

Note 5 - Loans and Allowance for Credit Losses (Details)		6 Months Ended		12 Months Ended
		Jun. 30, 2015USD ($)	Jun. 30, 2014USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Mar. 31, 2015USD ($)	Mar. 31, 2014USD ($)
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Percentage of Outstanding Principal Balance Commercial Real Estate Loans		47.50%
Loans and Leases Receivable, Related Parties		$ 3,953,000		$ 4,940,000	$ 6,187,000
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage		10,482,000		8,602,000
Financing Receivable, Recorded Investment, Nonaccrual Status		31,987,000		31,422,000
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans		1,600,000	$ 483,000
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%
Loans and Leases Receivable, Allowance		$ 80,972,000	$ 73,266,000	$ 80,762,000	67,282,000	$ 80,963,000	$ 67,096,000
Allowance for Credit Losses as Percentage of Loans		0.89%		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		$ 9,000
Veteran Administration and Federal Housing Administration Loan [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Debt Instrument, Term		30 years
Nonperforming Financial Instruments [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	$ 31,987,000		$ 31,422,000
Other Real Estate, Foreclosed Assets, and Repossessed Assets		35,119,000		36,919,000
Originated by Acquired Banks [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Other Real Estate, Foreclosed Assets, and Repossessed Assets		30,300,000		30,700,000
Commercial Real Estate Portfolio Segment [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		7,536,000		6,340,000
Loans and Leases Receivable, Allowance		$ 13,002,000	$ 23,679,000	12,744,000	24,835,000	12,538,000	23,371,000
Financing Receivable, Modifications, Number of Contracts			1
Financing Receivable, Modifications, Pre-Modification Recorded Investment			$ 35,000
Residential Portfolio Segment [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Loan Collateralized		89.00%
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage		$ 10,482,000	8,400,000	8,602,000
Financing Receivable, Recorded Investment, Nonaccrual Status	[2]	2,987,000		3,570,000
Loans and Leases Receivable, Allowance		16,593,000	18,905,000	16,377,000	17,046,000	16,778,000	18,718,000
Consumer Portfolio Segment [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		274,000		353,000
Loans and Leases Receivable, Allowance		$ 1,492,000	3,284,000	2,092,000	$ 1,652,000	$ 1,428,000	$ 1,398,000
Financing Receivable, Modifications, Number of Contracts		1
Financing Receivable, Modifications, Pre-Modification Recorded Investment		$ 10,000
Receivables Acquired with Deteriorated Credit Quality [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Loans and Leases Receivable, Allowance		163,000	0	0
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial Real Estate Portfolio Segment [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Loans and Leases Receivable, Allowance		0	0	0
Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Portfolio Segment [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Loans and Leases Receivable, Allowance		0	0	0
Receivables Acquired with Deteriorated Credit Quality [Member] | Consumer Portfolio Segment [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Loans and Leases Receivable, Allowance		0	0	0
Substandard [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Loans Receivable, Fair Value Disclosure		26,600,000		32,000,000
Troubled Debt Restructuring [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		$ 661,000	$ 1,300,000	$ 911,000
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%
Maximum [Member] | Commercial Real Estate Portfolio Segment [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Period of Fixed Interest		5 years
Debt Instrument, Term		20 years
Maximum [Member] | Residential Portfolio Segment [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Debt Instrument, Term		25 years
Maximum [Member] | Consumer Portfolio Segment [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Debt Instrument, Term		180 months
Minimum [Member] | Commercial Real Estate Portfolio Segment [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Debt Instrument, Term		15 years
Minimum [Member] | Residential Portfolio Segment [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Debt Instrument, Term		5 years
Minimum [Member] | Consumer Portfolio Segment [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Debt Instrument, Term		12 months
[1]	Includes troubled debt restructurings of $661 thousand and $911 thousand as of June 30, 2015 and December 31, 2014, respectively.
[2]	Includes $10.5 million and $8.6 million of residential mortgage loans held for sale at June 30, 2015 and December 31, 2014, respectively.

Note 5 - Loans and Allowance 36

Note 5 - Loans and Allowance for Credit Losses (Details) - Types of Loans in Loan Portfolio - USD ($) $ in Thousands		Jun. 30, 2015		Dec. 31, 2014		Jun. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential mortgage loans held for sale		$ 10,482		$ 8,602
Loans held for investment		9,103,853		9,235,581		$ 9,299,754
Total		9,114,335		9,244,183
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential mortgage loans held for sale		10,482		8,602		8,400
Loans held for investment		2,552,170		2,513,579		2,413,152
Total	[1]	2,562,652	[2]	2,522,181	[3]
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		1,654,517		1,806,267		2,144,027
Total		1,654,517		1,806,267
Construction, Land Development and Other Land Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		1,068,056		1,026,475		1,005,099
Total		1,068,056		1,026,475
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		2,958,239		3,030,340		3,027,945
Total		2,958,239		3,030,340
Farmland Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		399,654		361,943
Agriculture Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		201,091		189,703
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		270,126		307,274		$ 167,171
Total		$ 270,126		$ 307,274
[1]	Includes $10.5 million and $8.6 million of residential mortgage loans held for sale at June 30, 2015 and December 31, 2014, respectively.
[2]	Includes $10.5 million of residential mortgage loans held for sale at June 30, 2015.
[3]	Includes $8.6 million of residential mortgage loans held for sale at December 31, 2014.

Note 5 - Loans and Allowance 37

Note 5 - Loans and Allowance for Credit Losses (Details) - Related Party Loans - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Related Party Loans [Abstract]
Beginning balance on January 1	$ 4,940	$ 6,187
New loans	174	4,913
Repayments and reclassified related loans	(1,161)	(6,160)
Ending balance	$ 3,953	$ 4,940

Note 5 - Loans and Allowance 38

Note 5 - Loans and Allowance for Credit Losses (Details) - Past Due Loans - USD ($) $ in Thousands		Jun. 30, 2015		Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		$ 28,790		$ 46,712
Nonaccrual loans		31,987		31,422
Current loans		9,053,558		9,166,049
Loans		9,114,335		9,244,183
Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		28,637		44,519
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		153		2,193
Construction, Land Development and Other Land Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		3,049		7,667
Nonaccrual loans		421		526
Current loans		1,064,586		1,018,282
Loans		1,068,056		1,026,475
Construction, Land Development and Other Land Portfolio Segment [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		2,896		7,667
Construction, Land Development and Other Land Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		153
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		728		3,372
Nonaccrual loans		605		96
Current loans		599,412		548,178
Loans		600,745		551,646
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		728		2,995
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing				377
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing	[1]	2,456		2,343
Nonaccrual loans	[1]	2,987		3,570
Current loans	[1]	2,557,209		2,516,268
Loans	[1]	2,562,652	[2]	2,522,181	[3]
Residential Portfolio Segment [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing	[1]	$ 2,456		2,261
Residential Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing	[1]			82
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		$ 5,640		12,744
Nonaccrual loans		7,536		6,340
Current loans		2,945,063		3,011,256
Loans		2,958,239		3,030,340
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		5,640		12,679
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing				65
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		16,615		19,174
Nonaccrual loans		20,164		20,537
Current loans		1,617,738		1,766,556
Loans		1,654,517		1,806,267
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		16,615		18,305
Commercial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing				869
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		302		1,412
Nonaccrual loans		274		353
Current loans		269,550		305,509
Loans		270,126		307,274
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		$ 302		612
Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing				$ 800
[1]	Includes $10.5 million and $8.6 million of residential mortgage loans held for sale at June 30, 2015 and December 31, 2014, respectively.
[2]	Includes $10.5 million of residential mortgage loans held for sale at June 30, 2015.
[3]	Includes $8.6 million of residential mortgage loans held for sale at December 31, 2014.

Note 5 - Loans and Allowance 39

Note 5 - Loans and Allowance for Credit Losses (Details) - Nonperforming Assets - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Note 5 - Loans and Allowance for Credit Losses (Details) - Nonperforming Assets [Line Items]
Nonaccrual loans (1)		$ 31,987	$ 31,422
Other real estate		2,806	3,237
Nonperforming Financial Instruments [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) - Nonperforming Assets [Line Items]
Nonaccrual loans (1)	[1]	31,987	31,422
Accruing loans 90 or more days past due		153	2,193
Total nonperforming loans		32,140	33,615
Repossessed assets		173	67
Other real estate		2,806	3,237
Total nonperforming assets		$ 35,119	$ 36,919
Nonperforming assets to total loans and other real estate		0.39%	0.40%
[1]	Includes troubled debt restructurings of $661 thousand and $911 thousand as of June 30, 2015 and December 31, 2014, respectively.

Note 5 - Loans and Allowance 40

Note 5 - Loans and Allowance for Credit Losses (Details) - Purchased Credit Impaired Loans - Receivables Acquired with Deteriorated Credit Quality [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
PCI loans:
Outstanding balance	$ 94,601	$ 129,412
Less: discount	48,277	72,270
Recorded investment	$ 46,324	$ 57,142

Note 5 - Loans and Allowance 41

Note 5 - Loans and Allowance for Credit Losses (Details) - Changes in Accretable Yield for PCI Loans - Receivables Acquired with Deteriorated Credit Quality [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Note 5 - Loans and Allowance for Credit Losses (Details) - Changes in Accretable Yield for PCI Loans [Line Items]
Balance at beginning of period	$ 7,870	$ 8,470	$ 9,867	$ 9,855
Additions		7,158		7,158
Reclassifications from nonaccretable	1,695	4,532	8,632	6,035
Accretion	(3,214)	(5,471)	(12,148)	(8,359)
Balance at June 30	$ 6,351	$ 14,689	$ 6,351	$ 14,689

Note 5 - Loans and Allowance 42

Note 5 - Loans and Allowance for Credit Losses (Details) - Non Purchased Credit Impaired Loans - Non PCI Loans [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Non-PCI loans:
Outstanding balance	$ 1,727,123	$ 2,186,111
Less: discount	67,895	89,105
Recorded investment	$ 1,659,228	$ 2,097,006

Note 5 - Loans and Allowance 43

Note 5 - Loans and Allowance for Credit Losses (Details) - Changes in Accretable Yield for Non PCI Loans - Non PCI Loans [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Note 5 - Loans and Allowance for Credit Losses (Details) - Changes in Accretable Yield for Non PCI Loans [Line Items]
Balance at beginning of period	$ 78,289	$ 77,163	$ 89,105	$ 87,798
Additions		66,059		66,059
Accretion charge-offs	(6)	(14)	(109)	(62)
Accretion	(10,388)	(19,881)	(21,101)	(30,468)
Balance at June 30	$ 67,895	$ 123,327	$ 67,895	$ 123,327

Note 5 - Loans and Allowance 44

Note 5 - Loans and Allowance for Credit Losses (Details) - Impaired Loans - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
With no related allowance recorded:
Impaired loans with no related allowance, recorded investment	$ 15,026	$ 24,682
Impaired loans with no related allowance, unpaid principal balance	15,960	25,052
Impaired loans with no related allowance, average recorded investment	20,321	14,084
With an allowance recorded:
Impaired loans with related allowance, recorded investment	10,153	4,498
Impaired loans with related allowance, unpaid principal balance	12,093	6,300
Impaired loans, related allowance	3,273	2,493
Impaired loans with related allowance, average recorded investment	8,296	4,930
Total:
Impaired loans, recorded investment	25,179	29,180
Impaired loans, unpaid principal balance	28,053	31,352
Impaired loans, related allowance	3,273	2,493
Impaired loans, average recorded investment	28,617	19,014
Construction, Land Development and Other Land Portfolio Segment [Member]
With no related allowance recorded:
Impaired loans with no related allowance, recorded investment	156	250
Impaired loans with no related allowance, unpaid principal balance	159	256
Impaired loans with no related allowance, average recorded investment	204	264
With an allowance recorded:
Impaired loans with related allowance, recorded investment	273	276
Impaired loans with related allowance, unpaid principal balance	466	276
Impaired loans, related allowance	185	225
Impaired loans with related allowance, average recorded investment	371	138
Total:
Impaired loans, recorded investment	429	526
Impaired loans, unpaid principal balance	625	532
Impaired loans, related allowance	185	225
Impaired loans, average recorded investment	575	402
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
With no related allowance recorded:
Impaired loans with no related allowance, recorded investment	545
Impaired loans with no related allowance, unpaid principal balance	551
Impaired loans with no related allowance, average recorded investment	276	7
With an allowance recorded:
Impaired loans with related allowance, recorded investment	11	46
Impaired loans with related allowance, unpaid principal balance	19	55
Impaired loans, related allowance	11	24
Impaired loans with related allowance, average recorded investment	33	34
Total:
Impaired loans, recorded investment	556	46
Impaired loans, unpaid principal balance	570	55
Impaired loans, related allowance	11	24
Impaired loans, average recorded investment	309	41
Residential Portfolio Segment [Member]
With no related allowance recorded:
Impaired loans with no related allowance, recorded investment	1,858	1,710
Impaired loans with no related allowance, unpaid principal balance	2,005	1,831
Impaired loans with no related allowance, average recorded investment	1,857	1,147
With an allowance recorded:
Impaired loans with related allowance, recorded investment	1,093	1,426
Impaired loans with related allowance, unpaid principal balance	1,136	1,473
Impaired loans, related allowance	243	418
Impaired loans with related allowance, average recorded investment	1,281	1,973
Total:
Impaired loans, recorded investment	2,951	3,136
Impaired loans, unpaid principal balance	3,141	3,304
Impaired loans, related allowance	243	418
Impaired loans, average recorded investment	3,138	3,120
Commercial Real Estate Portfolio Segment [Member]
With no related allowance recorded:
Impaired loans with no related allowance, recorded investment	5,560	5,093
Impaired loans with no related allowance, unpaid principal balance	5,606	5,126
Impaired loans with no related allowance, average recorded investment	5,350	3,792
With an allowance recorded:
Impaired loans with related allowance, recorded investment	1,847	62
Impaired loans with related allowance, unpaid principal balance	3,442	63
Impaired loans, related allowance	743	24
Impaired loans with related allowance, average recorded investment	1,752	838
Total:
Impaired loans, recorded investment	7,407	5,155
Impaired loans, unpaid principal balance	9,048	5,189
Impaired loans, related allowance	743	24
Impaired loans, average recorded investment	7,102	4,630
Commercial Portfolio Segment [Member]
With no related allowance recorded:
Impaired loans with no related allowance, recorded investment	6,845	9,485
Impaired loans with no related allowance, unpaid principal balance	7,577	9,678
Impaired loans with no related allowance, average recorded investment	8,531	4,794
With an allowance recorded:
Impaired loans with related allowance, recorded investment	6,724	2,454
Impaired loans with related allowance, unpaid principal balance	6,787	4,182
Impaired loans, related allowance	2,004	1,597
Impaired loans with related allowance, average recorded investment	4,621	1,783
Total:
Impaired loans, recorded investment	13,569	11,939
Impaired loans, unpaid principal balance	14,364	13,860
Impaired loans, related allowance	2,004	1,597
Impaired loans, average recorded investment	13,152	6,577
Consumer Portfolio Segment [Member]
With no related allowance recorded:
Impaired loans with no related allowance, recorded investment	62	8,144
Impaired loans with no related allowance, unpaid principal balance	62	8,161
Impaired loans with no related allowance, average recorded investment	4,103	4,080
With an allowance recorded:
Impaired loans with related allowance, recorded investment	205	234
Impaired loans with related allowance, unpaid principal balance	243	251
Impaired loans, related allowance	87	205
Impaired loans with related allowance, average recorded investment	238	164
Total:
Impaired loans, recorded investment	267	8,378
Impaired loans, unpaid principal balance	305	8,412
Impaired loans, related allowance	87	205
Impaired loans, average recorded investment	$ 4,341	$ 4,244

Note 5 - Loans and Allowance 45

Note 5 - Loans and Allowance for Credit Losses (Details) - Risk Grades and Impaired Loans by Class of Loan - USD ($) $ in Thousands		Jun. 30, 2015		Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 9,114,335		$ 9,244,183
Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		116,803		116,444
Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		137,269
Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		8,263,656		8,975,682
Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		361,011
Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		103,511		19,644
Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		60,582		46,091
Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		21,456		29,075
Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		3,723		105
PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		46,324	[1]	57,142	[2]
Construction, Land Development and Other Land Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		1,068,056		1,026,475
Construction, Land Development and Other Land Portfolio Segment [Member] | Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		118
Construction, Land Development and Other Land Portfolio Segment [Member] | Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		17,798
Construction, Land Development and Other Land Portfolio Segment [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		1,028,829		1,022,002
Construction, Land Development and Other Land Portfolio Segment [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		17,980
Construction, Land Development and Other Land Portfolio Segment [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		113		497
Construction, Land Development and Other Land Portfolio Segment [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		1,223		2,308
Construction, Land Development and Other Land Portfolio Segment [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		214		526
Construction, Land Development and Other Land Portfolio Segment [Member] | Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		215
Construction, Land Development and Other Land Portfolio Segment [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		1,566	[1]	1,142	[2]
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		600,745		551,646
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		12,641		13,507
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		5,943
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		544,791		528,400
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		26,697
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		5,950		4,265
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		3,667		4,921
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		556		46
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		500	[1]	507	[2]
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[3]	$ 2,562,652	[4]	$ 2,522,181	[5]
Residential Portfolio Segment [Member] | Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans
Residential Portfolio Segment [Member] | Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 29,016	[4]
Residential Portfolio Segment [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		2,470,309	[4]	$ 2,503,679	[5]
Residential Portfolio Segment [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		45,416	[4]
Residential Portfolio Segment [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		2,130	[4]	$ 1,174	[5]
Residential Portfolio Segment [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		7,105	[4]	8,266	[5]
Residential Portfolio Segment [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		2,890	[4]	$ 3,136	[5]
Residential Portfolio Segment [Member] | Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 61	[4]
Residential Portfolio Segment [Member] | Grade 9 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans
Residential Portfolio Segment [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 5,725	[1],[4]	$ 5,926	[2],[5]
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		2,958,239		3,030,340
Commercial Real Estate Portfolio Segment [Member] | Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		2,127
Commercial Real Estate Portfolio Segment [Member] | Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		24,310
Commercial Real Estate Portfolio Segment [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		2,713,249		2,965,455
Commercial Real Estate Portfolio Segment [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		143,541
Commercial Real Estate Portfolio Segment [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		19,033		10,424
Commercial Real Estate Portfolio Segment [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		28,083		25,839
Commercial Real Estate Portfolio Segment [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		7,210		5,155
Commercial Real Estate Portfolio Segment [Member] | Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		197
Commercial Real Estate Portfolio Segment [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		20,489	[1]	23,467	[2]
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		1,654,517		1,806,267
Commercial Portfolio Segment [Member] | Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		57,264		61,697
Commercial Portfolio Segment [Member] | Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		25,650
Commercial Portfolio Segment [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		1,326,302		1,698,558
Commercial Portfolio Segment [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		124,379
Commercial Portfolio Segment [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		68,839		3,266
Commercial Portfolio Segment [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		20,470		4,707
Commercial Portfolio Segment [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		10,319		11,834
Commercial Portfolio Segment [Member] | Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		3,250		105
Commercial Portfolio Segment [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		18,044	[1]	26,100	[2]
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		270,126		307,274
Consumer Portfolio Segment [Member] | Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		44,653		41,240
Consumer Portfolio Segment [Member] | Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		34,552
Consumer Portfolio Segment [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		180,176		257,588
Consumer Portfolio Segment [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		2,998
Consumer Portfolio Segment [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		7,446		18
Consumer Portfolio Segment [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		34		50
Consumer Portfolio Segment [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 267		$ 8,378
Consumer Portfolio Segment [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans
[1]	Of the total PCI loans, $26.6 million were classifed as substandard at June 30, 2015.
[2]	Of the total PCI loans, $32.0 million were classifed as substandard at December 31, 2014.
[3]	Includes $10.5 million and $8.6 million of residential mortgage loans held for sale at June 30, 2015 and December 31, 2014, respectively.
[4]	Includes $10.5 million of residential mortgage loans held for sale at June 30, 2015.
[5]	Includes $8.6 million of residential mortgage loans held for sale at December 31, 2014.

Note 5 - Loans and Allowance 46

Note 5 - Loans and Allowance for Credit Losses (Details) - Activity in Allowance for Loan Losses - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Three Months Ended
Balance	$ 80,963	$ 67,096	$ 80,762	$ 67,282
Provision for credit losses	500	6,325	1,750	6,925
Charge-offs	(1,009)	(1,641)	(2,758)	(3,086)
Recoveries	518	1,486	1,218	2,145
Net charge-offs	(491)	(155)	(1,540)	(941)
Balance	80,972	73,266	80,972	73,266
Allowance for credit losses related to:
Allowance for credit losses individually evaluated for impairment			3,273	3,328	$ 2,493
Allowance for credit losses collectively evaluated for impairment			77,536	69,938	78,269
Allowance for credit losses	80,972	67,096	80,972	73,266	80,762
Recorded investment in loans:
Loans individually evaluated for impairment			25,179	12,728	29,180
Loans collectively evaluated for impairment			9,032,350	9,207,943	9,149,259
Loans			9,103,853	9,299,754	9,235,581
Receivables Acquired with Deteriorated Credit Quality [Member]
Three Months Ended
Balance			0
Balance	163	0	163	0
Allowance for credit losses related to:
Allowance for credit losses	163	0	163	0	0
Recorded investment in loans:
Loans			46,324	79,083	57,142
Construction, Land Development and Other Land Portfolio Segment [Member]
Three Months Ended
Balance	16,858	13,600	15,825	14,353
Provision for credit losses	49	1,508	1,227	738
Charge-offs	0	(153)	(151)	(155)
Recoveries	2	38	8	57
Net charge-offs	2	(115)	(143)	(98)
Balance	16,909	14,993	16,909	14,993
Allowance for credit losses related to:
Allowance for credit losses individually evaluated for impairment			185	0	225
Allowance for credit losses collectively evaluated for impairment			16,724	14,993	15,600
Allowance for credit losses	16,858	13,600	16,909	14,993	15,825
Recorded investment in loans:
Loans individually evaluated for impairment			429	315	526
Loans collectively evaluated for impairment			1,066,061	1,001,378	1,024,807
Loans			1,068,056	1,005,099	1,026,475
Construction, Land Development and Other Land Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Three Months Ended
Balance			0
Balance	0	0	0	0
Allowance for credit losses related to:
Allowance for credit losses	0	0	0	0	0
Recorded investment in loans:
Loans			1,566	3,406	1,142
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Three Months Ended
Balance	3,277	1,356	3,722	1,229
Provision for credit losses	429	(751)	(94)	(705)
Charge-offs	0	(1)	0	(15)
Recoveries	65	844	143	939
Net charge-offs	65	843	143	924
Balance	3,771	1,448	3,771	1,448
Allowance for credit losses related to:
Allowance for credit losses individually evaluated for impairment			11	53	24
Allowance for credit losses collectively evaluated for impairment			3,760	1,395	3,698
Allowance for credit losses	3,277	1,356	3,771	1,448	3,722
Recorded investment in loans:
Loans individually evaluated for impairment			556	75	46
Loans collectively evaluated for impairment			599,689	541,703	551,093
Loans			600,745	542,360	551,646
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Three Months Ended
Balance			0
Balance	0	0	0	0
Allowance for credit losses related to:
Allowance for credit losses	0	0	0	0	0
Recorded investment in loans:
Loans			500	582	507
Residential Portfolio Segment [Member]
Three Months Ended
Balance	16,778	18,718	16,377	17,046
Provision for credit losses	(173)	593	314	2,396
Charge-offs	(31)	(523)	(129)	(662)
Recoveries	19	117	31	125
Net charge-offs	(12)	(406)	(98)	(537)
Balance	16,593	18,905	16,593	18,905
Allowance for credit losses related to:
Allowance for credit losses individually evaluated for impairment			243	249	418
Allowance for credit losses collectively evaluated for impairment			16,350	18,656	15,959
Allowance for credit losses	16,778	18,718	16,593	18,905	16,377
Recorded investment in loans:
Loans individually evaluated for impairment			2,951	1,180	3,136
Loans collectively evaluated for impairment			2,543,494	2,403,165	2,504,517
Loans			2,552,170	2,413,152	2,513,579
Residential Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Three Months Ended
Balance			0
Balance	0	0	0	0
Allowance for credit losses related to:
Allowance for credit losses	0	0	0	0	0
Recorded investment in loans:
Loans			5,725	8,807	5,926
Commercial Real Estate Portfolio Segment [Member]
Three Months Ended
Balance	12,538	23,371	12,744	24,835
Provision for credit losses	578	313	405	(1,091)
Charge-offs	(136)	(26)	(179)	(128)
Recoveries	22	21	32	63
Net charge-offs	(114)	(5)	(147)	(65)
Balance	13,002	23,679	13,002	23,679
Allowance for credit losses related to:
Allowance for credit losses individually evaluated for impairment			743	47	24
Allowance for credit losses collectively evaluated for impairment			12,259	23,632	12,720
Allowance for credit losses	12,538	23,371	13,002	23,679	12,744
Recorded investment in loans:
Loans individually evaluated for impairment			7,407	937	5,155
Loans collectively evaluated for impairment			2,930,343	2,996,361	3,001,718
Loans			2,958,239	3,027,945	3,030,340
Commercial Real Estate Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Three Months Ended
Balance			0
Balance	0	0	0	0
Allowance for credit losses related to:
Allowance for credit losses	0	0	0	0	0
Recorded investment in loans:
Loans			20,489	30,647	23,467
Commercial Portfolio Segment [Member]
Three Months Ended
Balance	30,084	8,653	30,002	8,167
Provision for credit losses	(907)	2,240	(321)	2,807
Charge-offs	(98)	(59)	(826)	(202)
Recoveries	126	123	350	185
Net charge-offs	28	64	(476)	(17)
Balance	29,205	10,957	29,205	10,957
Allowance for credit losses related to:
Allowance for credit losses individually evaluated for impairment			2,004	2,887	1,597
Allowance for credit losses collectively evaluated for impairment			27,038	8,070	28,405
Allowance for credit losses	30,084	8,653	29,205	10,957	30,002
Recorded investment in loans:
Loans individually evaluated for impairment			13,569	10,094	11,939
Loans collectively evaluated for impairment			1,622,904	2,098,292	1,768,228
Loans			1,654,517	2,144,027	1,806,267
Commercial Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Three Months Ended
Balance			0
Balance	163	0	163	0
Allowance for credit losses related to:
Allowance for credit losses	163	0	163	0	0
Recorded investment in loans:
Loans			18,044	35,641	26,100
Consumer Portfolio Segment [Member]
Three Months Ended
Balance	1,428	1,398	2,092	1,652
Provision for credit losses	524	2,422	219	2,780
Charge-offs	(744)	(879)	(1,473)	(1,924)
Recoveries	284	343	654	776
Net charge-offs	(460)	(536)	(819)	(1,148)
Balance	1,492	3,284	1,492	3,284
Allowance for credit losses related to:
Allowance for credit losses individually evaluated for impairment			87	92	205
Allowance for credit losses collectively evaluated for impairment			1,405	3,192	1,887
Allowance for credit losses	1,428	1,398	1,492	3,284	2,092
Recorded investment in loans:
Loans individually evaluated for impairment			267	127	8,378
Loans collectively evaluated for impairment			269,859	167,044	298,896
Loans			270,126	167,171	307,274
Consumer Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Three Months Ended
Balance			0
Balance	0	0	0	0
Allowance for credit losses related to:
Allowance for credit losses	$ 0	$ 0	0	0	0
Recorded investment in loans:
Loans			$ 0	$ 0	$ 0

Note 5 - Loans and Allowance 47

Note 5 - Loans and Allowance for Credit Losses (Details) - Troubled Debt Restructurings $ in Thousands	6 Months Ended
	Jun. 30, 2015USD ($)	Jun. 30, 2014USD ($)
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	$ 9	$ 50
Commercial Real Estate Portfolio Segment [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 Portfolio Segment [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		$ 15
Consumer Portfolio Segment [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	$ 9

Note 6 - Fair Value (Details)

Note 6 - Fair Value (Details) - Jun. 30, 2015 - USD ($) $ in Thousands	Total	Total
Fair Value Disclosures [Abstract]
Other Real Estate, Additions	$ 183	$ 1,200
Real Estate Owned Outstanding	183	763
Additions to Impaired Loans	6,500	8,000
Impaired Loans Outstanding	$ 7,700	$ 7,700

Note 6 - Fair Value (Details) -

Note 6 - Fair Value (Details) - Fair Value Assets and Liabilities Measured on Recurring Basis - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Available for sale securities:
Available for sale securities	$ 123,229	$ 145,399
Liabilities:
Non-hedging interest rate swap	(368)
US States and Political Subdivisions Debt Securities [Member]
Available for sale securities:
Available for sale securities	9,272	14,585
Collateralized Debt Obligations [Member]
Available for sale securities:
Available for sale securities	29,917	33,573
Collateralized Mortgage Backed Securities [Member]
Available for sale securities:
Available for sale securities	71,323	84,483
Other Debt Obligations [Member]
Available for sale securities:
Available for sale securities	12,717	12,758
Not Designated as Hedging Instrument [Member]
Available for sale securities:
Non-hedging interest rate swap	368	303
Liabilities:
Non-hedging interest rate swap		(303)
Fair Value, Inputs, Level 1 [Member]
Available for sale securities:
Available for sale securities	12,717	12,758
Fair Value, Inputs, Level 1 [Member] | Other Debt Obligations [Member]
Available for sale securities:
Available for sale securities	12,717	12,758
Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Available for sale securities	110,512	132,641
Liabilities:
Non-hedging interest rate swap	(368)
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Available for sale securities:
Available for sale securities	9,272	14,585
Fair Value, Inputs, Level 2 [Member] | Collateralized Debt Obligations [Member]
Available for sale securities:
Available for sale securities	29,917	33,573
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member]
Available for sale securities:
Available for sale securities	71,323	84,483
Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]
Available for sale securities:
Non-hedging interest rate swap	$ 368	303
Liabilities:
Non-hedging interest rate swap		$ (303)

Note 6 - Fair Value (Details)50

Note 6 - Fair Value (Details) - Financial Instruments Fair Value - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 353,047	$ 677,285
Federal funds sold	1,451	569
Held to maturity securities	9,592,825	8,948,692
Deposits:
Noninterest-bearing	5,040,628	4,936,420
Interest-bearing	11,961,036	12,756,738
Other borrowings	886,741	8,724
Securities sold under repurchase agreements	334,189	315,523
Junior subordinated debentures		167,531
Reported Value Measurement [Member]
Assets
Cash and due from banks	353,047	677,285
Federal funds sold	1,451	569
Held to maturity securities	9,574,850	8,900,377
Loans held for sale	10,482	8,602
Loans held for investment, net of allowance	9,022,881	9,154,819
Other real estate owned	2,806	3,237
Deposits:
Noninterest-bearing	5,040,628	4,936,420
Interest-bearing	11,961,036	12,756,738
Other borrowings	886,741	8,724
Securities sold under repurchase agreements	334,189	315,523
Junior subordinated debentures		167,531
Estimate of Fair Value Measurement [Member]
Assets
Cash and due from banks	353,047	677,285
Federal funds sold	1,451	569
Held to maturity securities	9,592,825	8,948,692
Loans held for sale	10,482	8,602
Loans held for investment, net of allowance	9,068,305	9,192,231
Other real estate owned	2,806	3,237
Deposits:
Noninterest-bearing	5,040,628	4,936,420
Interest-bearing	11,969,183	12,767,961
Other borrowings	887,556	10,000
Securities sold under repurchase agreements	334,207	315,543
Junior subordinated debentures		159,740
Fair Value, Inputs, Level 1 [Member]
Assets
Cash and due from banks	353,047	677,285
Federal funds sold	1,451	569
Fair Value, Inputs, Level 2 [Member]
Assets
Held to maturity securities	9,592,825	8,948,692
Loans held for sale	10,482	8,602
Other real estate owned	2,806	3,237
Deposits:
Noninterest-bearing	5,040,628	4,936,420
Interest-bearing	11,969,183	12,767,961
Other borrowings	887,556	10,000
Securities sold under repurchase agreements	334,207	315,543
Junior subordinated debentures		159,740
Fair Value, Inputs, Level 3 [Member]
Assets
Loans held for investment, net of allowance	$ 9,068,305	$ 9,192,231

Note 7 - Goodwill and Core De51

Note 7 - Goodwill and Core Deposit Intangibles (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Note 7 - Goodwill and Core Deposit Intangibles (Details) [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss	$ 0		$ 0
Amortization of Intangible Assets	$ 2,390,000	$ 2,630,000	$ 4,879,000	$ 4,675,000	$ 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

Note 7 - Goodwill and Core De52

Note 7 - Goodwill and Core Deposit Intangibles (Details) - Goodwill and Core Deposit Intangibles - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 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		$ 1,881,955		$ 1,874,191	$ 1,671,520
Balance	54,068		54,068		58,947	$ 42,049
Less:
Amortization	(2,390)	$ (2,630)	(4,879)	$ (4,675)	(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		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

Note 7 - Goodwill and Core De53

Note 7 - Goodwill and Core Deposit Intangibles (Details) - Estimated Aggregate Future Amortization Expense for Intangible Assets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Dec. 31, 2013
Estimated Aggregate Future Amortization Expense for Intangible Assets [Abstract]
Remaining 2,015	$ 4,651
2,016	8,519
2,017	6,327
2,018	5,400
2,019	4,546
Thereafter	24,625
Total	$ 54,068	$ 58,947	$ 42,049

Note 8 - Stock Based Compensa54

Note 8 - Stock Based Compensation (Details)	3 Months Ended		6 Months Ended		42 Months Ended
	Jun. 30, 2015USD ($)shares	Jun. 30, 2014USD ($)	Jun. 30, 2015USD ($)shares	Jun. 30, 2014USD ($)	Jun. 30, 2015USD ($)shares
Note 8 - Stock Based Compensation (Details) [Line Items]
Number of Stock-based Employee Compensation Plans	3		3		3
Number of Stock-based Employee Compensation Plans Expired	2		2		2
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options | $	$ 67,000	$ 576,000	$ 67,000	$ 2,400,000
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options | $	0	$ 0	0	$ 0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $	$ 26,300,000		$ 26,300,000		$ 26,300,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 69 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		920,000		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		1,250,000		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		1,250,000		1,250,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)					300,943

Note 9 - Contractual Obigatio55

Note 9 - Contractual Obigations and Off-Balance Sheet Items (Details) $ in Millions	6 Months Ended
	Jun. 30, 2015USD ($)
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	$ 1.2

Note 9 - Contractual Obigatio56

Note 9 - Contractual Obigations and Off-Balance Sheet Items (Details) - Contractual Obligations and Other Commitments $ in Thousands	Jun. 30, 2015USD ($)
Note 9 - Contractual Obigations and Off-Balance Sheet Items (Details) - Contractual Obligations and Other Commitments [Line Items]
1 year or less	$ 1,166,592
More than 1 year but less than 3 years	325,975
3 years or more but less than 5 years	41,834
5 years or more	429,991
Total	1,964,392
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	881,056
More than 1 year but less than 3 years	1,843
3 years or more but less than 5 years	4,417
5 years or more	650
Total	887,966
Operating Leases [Member]
Note 9 - Contractual Obigations and Off-Balance Sheet Items (Details) - Contractual Obligations and Other Commitments [Line Items]
1 year or less	6,268
More than 1 year but less than 3 years	8,319
3 years or more but less than 5 years	3,898
5 years or more	7,321
Total	25,806
Lease, Total [Member]
Note 9 - Contractual Obigations and Off-Balance Sheet Items (Details) - Contractual Obligations and Other Commitments [Line Items]
1 year or less	887,324
More than 1 year but less than 3 years	10,162
3 years or more but less than 5 years	8,315
5 years or more	7,971
Total	$ 913,772

Note 9 - Contractual Obigatio57

Note 9 - Contractual Obigations and Off-Balance Sheet Items (Details) - Letters of Credit and Commitments $ in Thousands	Jun. 30, 2015USD ($)
Line of Credit Facility [Line Items]
1 year or less	$ 1,166,592
More than 1 year but less than 3 years	325,975
3 years or more but less than 5 years	41,834
5 years or more	429,991
Total	1,964,392
Commitments to Extend Credit [Member]
Line of Credit Facility [Line Items]
1 year or less	1,082,493
More than 1 year but less than 3 years	309,405
3 years or more but less than 5 years	40,698
5 years or more	429,991
Total	1,862,587
Financial Standby Letter of Credit [Member]
Line of Credit Facility [Line Items]
1 year or less	84,099
More than 1 year but less than 3 years	16,570
3 years or more but less than 5 years	1,136
Total	$ 101,805

Note 10 - Other Comprehensive58

Note 10 - Other Comprehensive (Loss) Income (Details) - Tax Effects Allocated to Each Component of Other Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Securities available for sale:
Change in unrealized gain during period	$ (640)	$ (317)	$ (1,082)	$ (806)
Change in unrealized gain during period	224	111	379	282
Change in unrealized gain during period	(416)	(206)	(703)	(524)
Total securities available for sale	(640)	(317)	(1,082)	(806)
Total securities available for sale	224	111	379	282
Total securities available for sale	(416)	(206)	(703)	(524)
Total other comprehensive loss	(640)	(317)	(1,082)	(806)
Total other comprehensive loss	224	111	379	282
Total other comprehensive loss	$ (416)	$ (206)	$ (703)	$ (524)

Note 10 - Other Comprehensive59

Note 10 - Other Comprehensive (Loss) Income (Details) - Activity in Accumulated Other Comprehensive Income, Net of Tax - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, accumulated other comprehensive income			$ 3,729	$ 4,883
Other comprehensive loss	$ (416)	$ (206)	(703)	(524)
Ending balance, accumulated other comprehensive income	3,026	4,359	3,026	4,359
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, accumulated other comprehensive income			3,729	4,883
Other comprehensive loss			(703)	(524)
Ending balance, accumulated other comprehensive income	$ 3,026	$ 4,359	$ 3,026	$ 4,359

Note 11 - Acquisitions (Details

Note 11 - Acquisitions (Details) $ / shares in Units, $ in Thousands	Apr. 02, 2014USD ($)$ / sharesshares	Jun. 30, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Note 11 - Acquisitions (Details) [Line Items]
Goodwill		$ 1,881,955	$ 1,874,191	$ 1,671,520
Goodwill, Purchase Accounting Adjustments		7,764	4,426
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
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	$ 2,270,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares) | shares	3,298,022
Payments to Acquire Businesses, Gross	$ 34,200
Business Combination, Consideration Transferred	$ 252,400
Business Acquisition, Share Price (in Dollars per share) | $ / shares	$ 66.15
Goodwill		206,000	198,200
Goodwill, Purchase Accounting Adjustments		7,800
Finite-lived Intangible Assets Acquired		$ 27,100	$ 27,140
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

Note 12 - Subsequent Events (De

Note 12 - Subsequent Events (Details) - Aug. 06, 2015 - Subsequent Event [Member] $ in Millions	USD ($)shares
Tradition Bancshares, Inc. [Member] | Houston [Member]
Note 12 - Subsequent Events (Details) [Line Items]
Number of Operating Banking Offices	7
Tradition Bancshares, Inc. [Member] | Katy [Member]
Note 12 - Subsequent Events (Details) [Line Items]
Number of Operating Banking Offices	3
Tradition Bancshares, Inc. [Member] | The Woodlands [Member]
Note 12 - Subsequent Events (Details) [Line Items]
Number of Operating Banking Offices	1
Tradition Bancshares, Inc. [Member]
Note 12 - Subsequent Events (Details) [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares)	679,679
Business Combination, Consideration Reserved for Purchase (in Dollars) | $	$ 39

Uncategorized Items - pb-201506

Label	Element	Value
Net gain on sale of assets	us-gaap_GainLossOnDispositionOfAssets1	$ 1,301
Net gain on sale of assets	us-gaap_GainLossOnDispositionOfAssets1	$ 270