Prosperity Bancshares (PB) 10-Q 9 May 16 2016 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2016	May. 05, 2016
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		69,569,915
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	No
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1

Consolidated Balance Sheets (Cu

Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
ASSETS
Cash and due from banks	$ 334,592	$ 562,544
Federal funds sold	1,386	1,418
Total cash and cash equivalents	335,978	563,962
Available for sale securities, at fair value	96,349	103,064
Held to maturity securities, at cost (fair value of $9,457,901 and $9,393,175, respectively)	9,352,355	9,399,363
Total securities	9,448,704	9,502,427
Loans held for sale	23,717	23,933
Loans held for investment	9,630,691	9,414,656
Total loans	9,654,408	9,438,589
Less: allowance for credit losses	(83,714)	(81,384)
Loans, net	9,570,694	9,357,205
Accrued interest receivable	50,082	51,924
Goodwill	1,903,451	1,868,827
Core deposit intangibles, net	47,195	49,417
Bank premises and equipment, net	277,951	267,996
Other real estate owned	16,695	2,963
Bank owned life insurance (BOLI)	245,337	235,429
Federal Home Loan Bank of Dallas stock	34,255	68,413
Other assets	48,003	68,653
TOTAL ASSETS	21,978,345	22,037,216
Deposits:
Noninterest-bearing	5,112,943	5,136,579
Interest-bearing	12,759,823	12,544,540
Total deposits	17,872,766	17,681,119
Other borrowings	186,225	491,399
Securities sold under repurchase agreements	304,204	315,253
Junior subordinated debentures	7,217
Accrued interest payable	2,164	1,896
Other liabilities	106,709	84,639
Total liabilities	18,479,285	18,574,306
SHAREHOLDERS’ EQUITY:
Common stock, $1 par value; 200,000,000 shares authorized; 69,580,453 and 70,058,761 shares issued at March 31, 2016 and December 31, 2015, respectively; 69,543,365 and 70,021,673 shares outstanding at March 31, 2016 and December 31, 2015, respectively	69,580	70,059
Capital surplus	2,024,849	2,036,378
Retained earnings	1,403,102	1,355,040
Accumulated other comprehensive income—net unrealized gain on available for sale securities, net of tax of $1,150 and $1,098, respectively	2,136	2,040
Less treasury stock, at cost, 37,088 shares	(607)	(607)
Total shareholders’ equity	3,499,060	3,462,910
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 21,978,345	$ 22,037,216

Consolidated Balance Sheets (C3

Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Held to maturity securities, fair value (in Dollars)	$ 9,457,901	$ 9,393,175
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	69,580,453	70,058,761
Common stock, shares outstanding	69,543,365	70,021,673
Accumulated other comprehensive income-net unrealized gain on available for sale securities, tax (in Dollars)	$ 1,150	$ 1,098
Treasury stock, shares	37,088	37,088

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
INTEREST INCOME:
Loans, including fees	$ 124,522	$ 124,878
Securities	52,573	48,562
Federal funds sold	96	165
Total interest income	177,191	173,605
INTEREST EXPENSE:
Deposits	10,206	9,577
Other borrowings	482	129
Securities sold under repurchase agreements	212	203
Junior subordinated debentures	34	791
Total interest expense	10,934	10,700
NET INTEREST INCOME	166,257	162,905
PROVISION FOR CREDIT LOSSES	14,000	1,250
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	152,257	161,655
NONINTEREST INCOME:
Nonsufficient funds (NSF) fees	8,189	7,918
Credit card, debit card and ATM card income	5,827	5,638
Service charges on deposit accounts	4,590	4,179
Trust income	2,027	2,009
Mortgage income	1,471	1,148
Brokerage income	1,290	1,409
Net gain on sale of assets	1,020	1,379
Other	6,379	4,741
Total noninterest income	30,793	28,421
NONINTEREST EXPENSE:
Salaries and employee benefits	50,114	49,966
Net occupancy and equipment	5,624	5,964
Credit and debit card, data processing and software amortization	4,430	3,817
Regulatory assessments and FDIC insurance	3,430	4,354
Core deposit intangibles amortization	2,222	2,489
Depreciation	3,349	2,916
Communications	2,939	2,809
Other real estate expense	42	132
Other	8,378	7,015
Total noninterest expense	80,528	79,462
INCOME BEFORE INCOME TAXES	102,522	110,614
PROVISION FOR INCOME TAXES	33,571	36,973
NET INCOME	$ 68,951	$ 73,641
EARNINGS PER SHARE:
Basic (in Dollars per share)	$ 0.98	$ 1.05
Diluted (in Dollars per share)	$ 0.98	$ 1.05

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net income	$ 68,951	$ 73,641
Securities available for sale:
Change in unrealized gain during period	148	(442)
Total other comprehensive income (loss)	148	(442)
Deferred taxes related to other comprehensive income (loss)	(52)	155
Other comprehensive income (loss), net of tax	96	(287)
Comprehensive income	$ 69,047	$ 73,354

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Tradition Bancshares Inc [Member]Common Stock [Member]	Tradition Bancshares Inc [Member]Capital Surplus [Member]	Tradition Bancshares Inc [Member]	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Total
Balance, beginning at Dec. 31, 2014				$ 69,817	$ 2,025,235	$ 1,146,652	$ 3,729	$ (607)	$ 3,244,826
Balance, beginning (in Shares) at Dec. 31, 2014				69,816,653
Net income						73,641			73,641
Other comprehensive loss							(287)		(287)
Common stock issued in connection with the exercise of stock options and restricted stock awards				$ 244	(244)
Common stock issued in connection with the exercise of stock options and restricted stock awards (in Shares)				244,225
Stock based compensation expense					2,763				2,763
Cash dividends declared						(19,082)			(19,082)
Balance, ending at Mar. 31, 2015				$ 70,061	2,027,754	1,201,211	3,442	(607)	3,301,861
Balance, ending (in Shares) at Mar. 31, 2015				70,060,878
Balance, beginning at Dec. 31, 2015				$ 70,059	2,036,378	1,355,040	2,040	(607)	3,462,910
Balance, beginning (in Shares) at Dec. 31, 2015				70,058,761
Net income						68,951			68,951
Other comprehensive loss							96		96
Common stock issued in connection with the exercise of stock options and restricted stock awards				$ 2	(2)
Common stock issued in connection with the exercise of stock options and restricted stock awards (in Shares)				1,750
Common stock issued in connection with the acquisition of Tradition Bancshares, Inc.	$ 679	$ 31,843	$ 32,522
Common stock issued in connection with the acquisition of Tradition Bancshares, Inc. (in Shares)	679,528
Stock repurchase				$ (1,160)	(46,022)				(47,182)
Stock repurchase (in Shares)				(1,159,586)
Stock based compensation expense					2,652				2,652
Cash dividends declared						(20,889)			(20,889)
Balance, ending at Mar. 31, 2016				$ 69,580	$ 2,024,849	$ 1,403,102	$ 2,136	$ (607)	$ 3,499,060
Balance, ending (in Shares) at Mar. 31, 2016				69,580,453

Consolidated Statements of Cha7

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash dividends declared, per share	$ 0.3000	$ 0.2725

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 68,951	$ 73,641
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and core deposit intangibles amortization	5,571	5,405
Provision for credit losses	14,000	1,250
Net amortization of premium on investments	10,253	14,144
(Gain) loss on sale of other real estate	(14)	10
Gain on sale of assets	(1,020)	(1,379)
Net accretion of discount on loans	(14,494)	(19,647)
Net accretion of discount on deposits	(182)	(420)
Gain on sale of loans	(1,341)	(1,093)
Proceeds from sale of loans held for sale	58,460	45,327
Originations of loans held for sale	(56,903)	(46,254)
Stock based compensation expense	2,652	2,763
Decrease in accrued interest receivable and other assets	62,906	30,543
Increase in accrued interest payable and other liabilities	12,159	12,276
Net cash provided by operating activities	160,998	116,566
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities and principal paydowns of held to maturity securities	414,681	392,556
Purchase of held to maturity securities	(132,952)	(954,084)
Proceeds from maturities and principal paydowns of available for sale securities	2,506,849	613,222
Purchase of available for sale securities	(2,499,989)	(600,000)
Net decrease in loans held for investment	12,730	97,616
Purchase of bank premises and equipment	(1,778)	(2,733)
Proceeds from sale of bank premises, equipment and other real estate	1,832	5,198
Net cash provided by (used in) investing activities	292,410	(448,225)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net (decrease) increase in noninterest-bearing deposits	(333,615)	102,016
Net increase (decrease) in interest-bearing deposits	36,517	(233,402)
Net (repayments) proceeds from other short-term borrowings	(305,000)	325,000
Repayments of other long-term borrowings	(174)	(1,810)
Net (decrease) increase in securities sold under repurchase agreements	(11,049)	2,895
Redemption of junior subordinated debentures		(167,531)
Repurchase of common stock	(47,182)
Payments of cash dividends	(20,889)	(19,082)
Net cash (used in) provided by financing activities	(681,392)	8,086
NET DECREASE IN CASH AND CASH EQUIVALENTS	(227,984)	(323,573)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	563,962	677,854
CASH AND CASH EQUIVALENTS, END OF PERIOD	335,978	354,281
NONCASH ACTIVITIES:
Acquisition of real estate through foreclosure of collateral	12,953	766
SUPPLEMENTAL INFORMATION:
Income taxes paid	5,400	2,000
Interest paid	10,666	$ 11,665
Tradition Bancshares Inc [Member]
CASH FLOWS FROM INVESTING ACTIVITIES:
Net cash used in the purchase of Tradition Bancshares, Inc.	(8,963)
NONCASH ACTIVITIES:
Stock issued in connection with the Tradition Bancshares, Inc. acquisition	$ 32,522

Note 1 - Basis of Presentation

Note 1 - Basis of Presentation	3 Months Ended
	Mar. 31, 2016
Disclosure Text Block [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	1. BASIS OF PRESENTATION The consolidated financial statements include the accounts of Prosperity Bancshares, Inc. ® (“Bancshares”) and its wholly-owned subsidiary, Prosperity Bank ® (the “Bank,” collectively referred to as the “Company”). All intercompany transactions and balances have been eliminated. The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for financial information and with the rules and regulations of the Securities and Exchange Commission. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, the statements reflect all adjustments necessary for a fair presentation of the financial position, results of operations and cash flows of the Company on a consolidated basis, and all such adjustments are of a normal recurring nature. These financial statements and the notes thereto should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2015. Operating results for the three-month period ended March 31, 2016 are not necessarily indicative of the results that may be expected for the year ending December 31, 2016 or any other period.

Note 2 - Income Per Common Shar

Note 2 - Income Per Common Share	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	2. INCOME PER COMMON SHARE Outstanding stock options issued by the Company represent the only dilutive effect reflected in diluted weighted average shares. The following table illustrates the computation of basic and diluted earnings per share: Three Months Ended March 31, 2016 2015 Amount Per Share Amount Amount Per Share Amount (Amounts in thousands, except per share data) Net income $ 68,951 $ 73,641 Basic: Weighted average shares outstanding 70,174 $ 0.98 70,034 $ 1.05 Diluted: Add incremental shares for: Effect of dilutive securities - options 7 21 Total 70,181 $ 0.98 70,055 $ 1.05 There were no stock options exercisable during the three months ended March 31, 2016 or 2015 that would have had an anti-dilutive effect on the above computation.

Note 3 - New Accounting Standar

Note 3 - New Accounting Standards	3 Months Ended
	Mar. 31, 2016
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 2016-09, “Compensation - Stock Compensation (Topic 718) – Improvements to Employee Share-Based Payment Accounting . ” ASU 2016-02 , "Leases (Topic 842) . " ASU 2016-01, “Financial Instruments—Overall (Subtopic 825-10) – Recognition and Measurement of Financial Assets and Financial Liabilities.” ASU 2015-16, “Business Combinations (Topic 805) – Simplifying the Accounting for Measurement-Period Adjustments.” 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 . ASU 2014-09 , “Revenue from Contracts with Customers (Topic 606).”

Note 4 - Securities

Note 4 - Securities	3 Months Ended
	Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	4. SECURITIES The amortized cost and fair value of investment securities were as follows: March 31, 2016 Amortized Gross Gross Fair (Dollars in thousands) Available for Sale States and political subdivisions $ 3,727 $ 11 $ - $ 3,738 Collateralized mortgage obligations 24,517 85 (6 ) 24,596 Mortgage-backed securities 52,230 2,999 (9 ) 55,220 Other securities 12,588 253 (46 ) 12,795 Total $ 93,062 $ 3,348 $ (61 ) $ 96,349 Held to Maturity U.S. Treasury securities and obligations of U.S. Government agencies $ 44,138 $ 1,208 $ - $ 45,346 States and political subdivisions 427,336 6,855 (444 ) 433,747 Collateralized mortgage obligations 1,028 20 (1 ) 1,047 Mortgage-backed securities 8,879,753 121,289 (23,380 ) 8,977,662 Other securities 100 - (1 ) 99 Total $ 9,352,355 $ 129,372 $ (23,826 ) $ 9,457,901 December 31, 2015 Amortized Gross Gross Fair (Dollars in thousands) Available for Sale States and political subdivisions $ 5,463 $ 22 $ - $ 5,485 Collateralized mortgage obligations 25,991 25 (100 ) 25,916 Mortgage-backed securities 55,884 3,098 (11 ) 58,971 Other securities 12,588 150 (46 ) 12,692 Total $ 99,926 $ 3,295 $ (157 ) $ 103,064 Held to Maturity U.S. Treasury securities and obligations of U.S. Government agencies $ 47,598 $ 798 $ - $ 48,396 States and political subdivisions 363,505 7,080 (542 ) 370,043 Collateralized mortgage obligations 2,107 17 (2 ) 2,122 Mortgage-backed securities 8,986,153 68,868 (82,407 ) 8,972,614 Other securities - - - - Total $ 9,399,363 $ 76,763 $ (82,951 ) $ 9,393,175 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 OTTI recognized in earnings depends on whether an entity intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss. If an entity intends to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss, the OTTI will be recognized in earnings equal to the entire difference between the investment’s amortized cost basis and its fair value at the balance sheet date. If an entity does not intend to sell the security and it is not more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis less any current-period loss, the OTTI will be separated into the amount representing the credit-related portion of the impairment loss (“credit loss”) and the noncredit portion of the impairment loss (“noncredit portion”). The amount of the total OTTI related to the credit loss is determined based on the difference between the present value of cash flows expected to be collected and the amortized cost basis and such difference is recognized in earnings. The amount of the total OTTI related to the noncredit portion is recognized in other comprehensive income, net of applicable taxes. The previous amortized cost basis less the OTTI recognized in earnings will become the new amortized cost basis of the investment. As of March 31, 2016, management does not have the intent to sell any of its investment securities and believes that it is more likely than not that the Company will not have to sell any such securities before a recovery of cost. The unrealized losses are largely due to increases in market interest rates over the yields available at the time the underlying securities were purchased. The fair value is expected to recover as the securities approach their maturity date or repricing date or if market yields for such investments decline. Management does not believe any of the securities are impaired due to reasons of credit quality. Accordingly, as of March 31, 2016, management believes any impairment in the Company’s securities is temporary, and therefore no impairment loss has been realized in the Company’s consolidated statement of income. Securities with unrealized losses, segregated by length of time, that have been in a continuous loss position were as follows: March 31, 2016 Less than 12 Months More than 12 Months Total Estimated Unrealized Estimated Unrealized Estimated Unrealized (Dollars in thousands) Available for Sale Collateralized mortgage obligations $ 1,752 $ (6 ) $ 1 $ - $ 1,753 $ (6 ) Mortgage-backed securities 1,236 (1 ) 2,338 (8 ) 3,574 (9 ) Other securities - - 1,691 (46 ) 1,691 (46 ) Total $ 2,988 $ (7 ) $ 4,030 $ (54 ) $ 7,018 $ (61 ) Held to Maturity States and political subdivisions $ 51,880 $ (333 ) $ 17,422 $ (111 ) $ 69,302 $ (444 ) Collateralized mortgage obligations - - 70 (1 ) 70 (1 ) Mortgage-backed securities 733,163 (3,258 ) 1,981,019 (20,122 ) 2,714,182 (23,380 ) Other securities 99 (1 ) - - 99 (1 ) Total $ 785,142 $ (3,592 ) $ 1,998,511 $ (20,234 ) $ 2,783,653 $ (23,826 ) December 31, 2015 Less than 12 Months More than 12 Months Total Estimated Unrealized Estimated Unrealized Estimate d Unrealized (Dollars in thousands) Available for Sale Collateralized mortgage obligations $ 14,331 $ (100 ) $ 1 $ - $ 14,332 $ (100 ) Mortgage-backed securities 793 (1 ) 2,465 (10 ) 3,258 (11 ) Other securities - - 1,691 (46 ) 1,691 (46 ) Total $ 15,124 $ (101 ) $ 4,157 $ (56 ) $ 19,281 $ (157 ) Held to Maturity States and political subdivisions $ 15,700 $ (82 ) $ 45,952 $ (460 ) $ 61,652 $ (542 ) Collateralized mortgage obligations 156 - 94 (2 ) 250 (2 ) Mortgage-backed securities 3,233,601 (36,016 ) 1,662,482 (46,391 ) 4,896,083 (82,407 ) Other securities - - - - - - Total $ 3,249,457 $ (36,098 ) $ 1,708,528 $ (46,853 ) $ 4,957,985 $ (82,951 ) At March 31, 2016 and December 31, 2015, there were 454 securities and 474 securities, respectively, in an unrealized loss position for more than 12 months. The amortized cost and fair value of investment securities at March 31, 2016, 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 (Dollars in thousands) Due in one year or less $ 32,595 $ 32,643 $ 12,688 $ 12,898 Due after one year through five years 209,129 211,924 3,072 3,080 Due after five years through ten years 195,827 200,118 555 555 Due after ten years 34,023 34,507 - - Subtotal 471,574 479,192 16,315 16,533 Mortgage-backed securities and collateralized mortgage obligations 8,880,781 8,978,709 76,747 79,816 Total $ 9,352,355 $ 9,457,901 $ 93,062 $ 96,349 The Company recorded no gain or loss on sale of securities for the three months ended March 31, 2016 and 2015. As of March 31, 2016, the Company did not own any non-agency collateralized mortgage obligations. At March 31, 2016 and December 31, 2015, 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 $6.08 billion and $5.81 billion and a fair value of $6.14 billion and $5.79 billion at March 31, 2016 and December 31, 2015, 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	3 Months Ended
	Mar. 31, 2016
Loans And Allowance For Credit Losses [Abstract]
Loans And Allowance For Credit Losses [Text Block]	5. LOANS AND ALLOWANCE FOR CREDIT LOSSES The loan portfolio consists of various types of loans made principally to borrowers located within the states of Texas and Oklahoma and is categorized by major type as follows: March 31, December 31, (Dollars in thousands) Residential mortgage loans held for sale $ 23,717 $ 23,933 Commercial and industrial 1,700,015 1,692,246 Real estate: Construction, land development and other land loans 1,173,524 1,073,198 1-4 family residential (including home equity) 2,639,472 2,616,732 Commercial real estate (including multi-family residential) 3,229,706 3,131,083 Farmland 451,111 434,349 Agriculture 190,182 214,469 Consumer and other 246,681 252,579 Total loans held for investment 9,630,691 9,414,656 Total $ 9,654,408 $ 9,438,589 Concentrations of Credit. Foreign Loans. Related Party Loans. An analysis of activity with respect to these related party loans is as follows: March 31, December 31, (Dollars in thousands) Beginning balance on January 1 $ 4,063 $ 4,940 New loans - 428 Repayments and reclassified related loans (32 ) (1,305 ) Ending balance $ 4,031 $ 4,063 Non performing Assets and Non accrual 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: March 31, 2016 Loans Past Due and Still Accruing 30-89 Days 90 or More Total Past Nonaccrual Current Total (Dollars in thousands) Construction, land development and other land loans $ 9,051 $ - $ 9,051 $ 1,670 $ 1,162,803 $ 1,173,524 Agriculture and agriculture real estate (includes farmland) 1,971 887 2,858 5,691 632,744 641,293 1-4 family (includes home equity) (1) 5,786 181 5,967 3,586 2,653,636 2,663,189 Commercial real estate (includes multi-family residential) 7,629 - 7,629 9,299 3,212,778 3,229,706 Commercial and industrial 9,471 25 9,496 18,621 1,671,898 1,700,015 Consumer and other 246 - 246 227 246,208 246,681 Total $ 34,154 $ 1,093 $ 35,247 $ 39,094 $ 9,580,067 $ 9,654,408 December 31, 2015 Loans Past Due and Still Accruing 30-89 Days 90 or More Total Past Nonaccrual Current Total (Dollars in thousands) Construction, land development and other land loans $ 4,097 $ - $ 4,097 $ 134 $ 1,068,967 $ 1,073,198 Agriculture and agriculture real estate (includes farmland) 946 - 946 208 647,664 648,818 1-4 family (includes home equity) (1) 4,748 220 4,968 1,894 2,633,803 2,640,665 Commercial real estate (includes multi-family residential) 12,922 - 12,922 15,535 3,102,626 3,131,083 Commercial and industrial 4,793 394 5,187 21,692 1,665,367 1,692,246 Consumer and other 1,274 - 1,274 248 251,057 252,579 Total $ 28,780 $ 614 $ 29,394 $ 39,711 $ 9,369,484 $ 9,438,589 ________________ (1) Includes $23.7 million and $23.9 million of residential mortgage loans held for sale at March 31, 2016 and December 31, 2015, respectively. The following table presents information regarding nonperforming assets as of the dates indicated: March 31, December 31, (Dollars in thousands) Nonaccrual loans (1) $ 39,094 $ 39,711 Accruing loans 90 or more days past due 1,093 614 Total nonperforming loans 40,187 40,325 Repossessed assets 161 171 Other real estate 16,695 2,963 Total nonperforming assets $ 57,043 $ 43,459 Nonperforming assets to total loans and other real estate 0.59 % 0.46 % ________________ (1) Includes troubled debt restructurings of $593 thousand and $681 thousand as of March 31, 2016 and December 31, 2015, respectively. The Company had $57.0 million in nonperforming assets at March 31, 2016 compared with $43.5 million at December 31, 2015. This increase was primarily due to an agricultural loan, as well as other real estate obtained from the acquisition of Tradition Bancshares, Inc. (“Tradition”) and its wholly-owned subsidiary Tradition Bank. Nonperforming assets were 0.59% of total loans and other real estate at March 31, 2016 compared with 0.46% of total loans and other real estate at December 31, 2015. These low nonperforming assets to total loans and other real estate ratios are reflective of the Company’s conservative lending approach. If interest on nonaccrual loans had been accrued under the original loan terms, approximately $1.0 million and $910 thousand would have been recorded as income for the three months ended March 31, 2016 and 2015, 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. March 31, December 31, (Dollars in thousands) PCI loans: Outstanding balance $ 73,590 $ 79,802 Less: discount 34,054 39,976 Recorded investment $ 39,536 $ 39,826 Changes in the accretable yield for acquired PCI loans as of the three months ended March 31, 2016 and 2015 were as follows: Three Months Ended March 31, 2016 2015 (Dollars in thousands) Balance at beginning of period $ 5,664 $ 9,867 Additions 10,222 - Reclassifications from nonaccretable 5,120 7,291 Accretion (7,831 ) (9,288 ) Balance at March 31 $ 13,175 $ 7,870 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 . March 31, December 31, 2015 (Dollars in thousands) Non-PCI loans: Outstanding balance $ 1,506,292 $ 1,430,501 Less: discount 50,509 54,734 Recorded investment $ 1,455,783 $ 1,375,767 Changes in the discount accretion for Non-PCI loans for the three months ended March 31, 2016 and 2015 were as follows: Three Months Ended March 31, 2016 2015 (Dollars in thousands) Balance at beginning of period $ 54,734 $ 89,105 Additions 3,491 - Accretion charge-offs (1,053 ) (457 ) Accretion (6,663 ) (10,359 ) Balance at March 31 $ 50,509 $ 78,289 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. March 31, 2016 Recorded Unpaid Principal l Related Average (Dollars in thousands) With no related allowance recorded: Construction, land development and other land loans $ 19 $ 336 $ - $ 26 Agriculture and agriculture real estate (includes farmland) 5,517 12,520 - 2,768 1-4 family (includes home equity) 2,032 2,189 - 1,619 Commercial real estate (includes multi-family residential) 9,159 9,455 - 12,137 Commercial and industrial 769 1,050 - 1,062 Consumer and other 63 137 - 60 Total 17,559 25,687 - 17,672 With an allowance recorded: Construction, land development and other land loans 6 10 2 6 Agriculture and agriculture real estate (includes farmland) 174 192 37 181 1-4 family (includes home equity) 347 357 91 363 Commercial real estate (includes multi-family residential) - - - 131 Commercial and industrial 17,672 30,230 7,464 16,133 Consumer and other 164 205 27 172 Total 18,363 30,994 7,621 16,986 Total: Construction, land development and other land loans 25 346 2 32 Agriculture and agriculture real estate (includes farmland) 5,691 12,712 37 2,949 1-4 family (includes home equity) 2,379 2,546 91 1,982 Commercial real estate (includes multi-family residential) 9,159 9,455 - 12,268 Commercial and industrial 18,441 31,280 7,464 17,195 Consumer and other 227 342 27 232 $ 35,922 $ 56,681 $ 7,621 $ 34,658 December 31, 2015 Recorded Unpaid Related Average (Dollars in thousands) With no related allowance recorded: Construction, land development and other land loans $ 33 $ 346 $ - $ 142 Agriculture and agriculture real estate (includes farmland) 20 23 - 10 1-4 family (includes home equity) 1,206 1,365 - 1,458 Commercial real estate (includes multi-family residential) 15,115 15,398 - 10,104 Commercial and industrial 1,354 1,630 - 5,419 Consumer and other 58 131 - 4,101 Total 17,786 18,893 - 21,234 With an allowance recorded: Construction, land development and other land loans 7 11 2 141 Agriculture and agriculture real estate (includes farmland) 189 201 52 118 1-4 family (includes home equity) 379 386 93 902 Commercial real estate (includes multi-family residential) 262 1,857 262 162 Commercial and industrial 14,594 16,413 7,082 8,524 Consumer and other 181 220 44 208 Total 15,612 19,088 7,535 10,055 Total: Construction, land development and other land loans 40 357 2 283 Agriculture and agriculture real estate (includes farmland) 209 224 52 128 1-4 family (includes home equity) 1,585 1,751 93 2,360 Commercial real estate (includes multi-family residential) 15,377 17,255 262 10,266 Commercial and industrial 15,948 18,043 7,082 13,943 Consumer and other 239 351 44 4,309 $ 33,398 $ 37,981 $ 7,535 $ 31,289 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 March 31, 2016. Impaired loans include loans in risk grades 7, 8 and 9, as well as any PCI loan that has a specific reserve allocated to it. Construction, Land Other Land Loans Agriculture and Farmland) 1-4 Family Home Equity) (1) Commercial Real Estate (includes Multi- Family Residential) Commercial and Industrial Consumer and Other Total (Dollars in thousands) Grade 1 $ - $ 12,574 $ - $ - $ 61,558 $ 44,866 $ 118,998 Grade 2 4,362 5,717 24,925 10,538 26,929 6,266 78,737 Grade 3 1,111,986 546,180 2,559,272 2,966,130 1,273,305 188,378 8,645,251 Grade 4 47,479 62,053 61,050 182,947 195,173 636 549,338 Grade 5 3,795 7,435 1,315 19,820 21,348 6,246 59,959 Grade 6 2,783 1,249 7,874 21,190 94,816 63 127,975 Grade 7 25 5,691 2,321 9,090 15,588 226 32,941 Grade 8 - - 58 69 1,546 - 1,673 Grade 9 - - - - - - - PCI Loans (2) 3,094 394 6,374 19,922 9,752 - 39,536 Total $ 1,173,524 $ 641,293 $ 2,663,189 $ 3,229,706 $ 1,700,015 $ 246,681 $ 9,654,408 (1) Includes $23.7 million of residential mortgage loans held for sale at March 31, 2016. (2) Of the total PCI loans, $4.4 million were classified as substandard at March 31, 2016 which includes $1.3 million with specific reserves allocated to them. The following table presents risk grades and PCI loans by category of loan at December 31, 2015. Impaired loans include loans in risk grades 7, 8 and 9, as well as any PCI loan that has a specific reserve allocated to it. Construction, Agriculture and 1-4 Family Commercial - Commercial Consumer and Total (Dollars in thousands) Grade 1 $ - $ 12,733 $ - $ - $ 57,625 $ 44,389 $ 114,747 Grade 2 3,975 5,603 27,272 24,965 27,755 34,668 124,238 Grade 3 1,034,792 553,782 2,539,282 2,861,872 1,355,887 162,892 8,508,507 Grade 4 29,831 67,453 58,172 164,924 123,772 3,395 447,547 Grade 5 2,431 7,191 1,261 20,078 68,618 6,908 106,487 Grade 6 1,209 1,452 7,824 26,237 28,005 88 64,815 Grade 7 40 209 1,526 15,377 12,487 239 29,878 Grade 8 - - 59 - 2,485 - 2,544 Grade 9 - - - - - - - PCI Loans (2) 920 395 5,269 17,630 15,612 - 39,826 Total $ 1,073,198 $ 648,818 $ 2,640,665 $ 3,131,083 $ 1,692,246 $ 252,579 $ 9,438,589 (1) Includes $23.9 million of residential mortgage loans held for sale at December 31, 2015. (2) Of the total PCI loans, $7.3 million were classified as substandard at December 31, 2015, which includes $976 thousand with specific reserves allocated to them. 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 March 31, 2016, the allowance for credit losses totaled $83.7 million or 0.87% of total loans, including acquired loans with discounts. At December 31, 2015, the allowance for credit losses totaled $81.4 million or 0.86% 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 months ended March 31, 2016 and 2015 . Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories. Construction, Agriculture 1-4 Family Commercial Commercial Consumer and Other Total (Dollars in thousands) Allowance for credit losses: Three Months Ended Balance January 1, 2016 $ 14,882 $ 3,845 $ 14,891 $ 12,996 $ 33,409 $ 1,361 $ 81,384 Provision for credit losses (703 ) 6,689 (297 ) (546 ) 8,150 707 14,000 Charge-offs (7 ) (7,025 ) (49 ) (59 ) (6,277 ) (848 ) (14,265 ) Recoveries 193 63 19 - 1,881 439 2,595 Net charge-offs 186 (6,962 ) (30 ) (59 ) (4,396 ) (409 ) (11,670 ) Balance March 31, 2016 $ 14,365 $ 3,572 $ 14,564 $ 12,391 $ 37,163 $ 1,659 $ 83,714 Allowance for credit losses: Three Months Ended Balance January 1, 2015 $ 15,825 $ 3,722 $ 16,377 $ 12,744 $ 30,002 $ 2,092 $ 80,762 Provision for credit losses 1,178 (523 ) 487 (173 ) 586 (305 ) 1,250 Charge-offs (151 ) - (98 ) (43 ) (728 ) (729 ) (1,749 ) Recoveries 6 78 12 10 224 370 700 Net charge-offs (145 ) 78 (86 ) (33 ) (504 ) (359 ) (1,049 ) Balance March 31, 2015 $ 16,858 $ 3,277 $ 16,778 $ 12,538 $ 30,084 $ 1,428 $ 80,963 The following table details the amount of the allowance for credit losses allocated to each category of loan as of March 31, 2016, December 31, 2015 and March 31, 2015, detailed on the basis of the impairment methodology used by the Company. Construction, Agriculture 1-4 Family Commercial Commercial Consumer and Other Total (Dollars in thousands) Allowance for credit losses related to: March 31, 2016 Individually evaluated for impairment $ 2 $ 37 $ 91 $ - $ 7,464 $ 27 $ 7,621 Collectively evaluated for impairment 14,363 3,535 14,473 12,391 28,531 1,632 74,925 PCI loans - - - - 1,168 - 1,168 Total allowance for credit losses $ 14,365 $ 3,572 $ 14,564 $ 12,391 $ 37,163 $ 1,659 $ 83,714 December 31, 2015 Individually evaluated for impairment $ 2 $ 52 $ 93 $ 262 $ 7,082 $ 44 $ 7,535 Collectively evaluated for impairment 14,880 3,793 14,798 12,734 25,491 1,317 73,013 PCI loans - - - - 836 - 836 Total allowance for credit losses $ 14,882 $ 3,845 $ 14,891 $ 12,996 $ 33,409 $ 1,361 $ 81,384 March 31, 2015 Individually evaluated for impairment $ 221 $ 21 $ 242 $ 507 $ 2,396 $ 93 $ 3,480 Collectively evaluated for impairment 16,637 3,256 16,536 12,031 26,276 1,335 76,071 PCI loans - - - - 1,412 - 1,412 Total allowance for credit losses $ 16,858 $ 3,277 $ 16,778 $ 12,538 $ 30,084 $ 1,428 $ 80,963 The following table details the recorded investment in loans as of March 31, 2016, December 31, 2015 and March 31, 2015, excluding $23.7 million, $23.9 million and $10.6 million, respectively, of residential mortgage loans held for sale, related to each balance in the allowance for credit losses by category of loan. Construction, Land Development and Other Land Loans Agriculture and Agriculture Real Estate (includes Farmland) 1-4 Family (includes Home Equity) Commercial Real Estate (includes Multi-Family Residential) Commercial and Industrial Consumer and Other Total (Dollars in thousands) Recorded investment in loans: March 31, 2016 Individually evaluated for impairment $ 25 $ 5,691 $ 2,379 $ 9,159 $ 18,441 $ 227 $ 35,922 Collectively evaluated for impairment 1,170,405 635,208 2,630,719 3,200,625 1,671,822 246,454 9,555,233 PCI loans 3,094 394 6,374 19,922 9,752 - 39,536 Total loans evaluated for impairment $ 1,173,524 $ 641,293 $ 2,639,472 $ 3,229,706 $ 1,700,015 $ 246,681 $ 9,630,691 December 31, 2015 Individually evaluated for impairment $ 40 $ 209 $ 1,585 $ 15,377 $ 15,948 $ 239 $ 33,398 Collectively evaluated for impairment 1,072,238 648,214 2,609,878 3,098,076 1,660,686 252,340 9,341,432 PCI loans 920 395 5,269 17,630 15,612 - 39,826 Total loans evaluated for impairment $ 1,073,198 $ 648,818 $ 2,616,732 $ 3,131,083 $ 1,692,246 $ 252,579 $ 9,414,656 March 31, 2015 Individually evaluated for impairment $ 521 $ 232 $ 2,603 $ 6,190 $ 11,019 $ 366 $ 20,931 Collectively evaluated for impairment 1,039,052 556,103 2,523,613 2,992,782 1,693,080 280,496 9,085,126 PCI loans 1,272 504 5,844 22,684 19,022 - 49,326 Total loans evaluated for impairment $ 1,040,845 $ 556,839 $ 2,532,060 $ 3,021,656 $ 1,723,121 $ 280,862 $ 9,155,383 Troubled Debt Restructurings. Receivables —Troubled Debt Restructurings by Creditors,” Three Months Ended March 31, 2016 2015 Number of Loans Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Number of Loans Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment (Dollars in thousands) Troubled Debt Restructurings Construction, land development and other land loans - $ - $ - - $ - $ - Agriculture and agriculture real estate (includes farmland) - - - - - - 1-4 Family (includes home equity) - - - - - - Commercial real estate (includes multi-family residential) - - - - - - Commercial and industrial - - - - - - Consumer and other - - - 1 10 10 Total - $ - $ - 1 $ 10 $ 10 As of March 31, 2016, there have been no defaults on any loans that were modified as troubled debt restructurings during the preceding twelve months. Default is determined at 90 or more days past due. For the three months ended March 31, 2016, the Company did not add any loans as new troubled debt restructurings. For the three months ended March 31, 2015, the Company added one loan totaling $10 thousand as a new troubled debt restructuring, all of which was still outstanding at March 31, 2015. 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. 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	3 Months Ended
	Mar. 31, 2016
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 other assets at fair value on a nonrecurring basis such as certain loans including residential mortgage loans held for sale, goodwill and other intangible assets and other real estate owned. These nonrecurring fair value adjustments typically involve application of lower-of-cost-or-market accounting or write downs of individual assets. ASC Topic 820 “ Fair Value Measurements and Disclosures Fair Value Hierarchy The Company groups financial assets and financial liabilities measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. These levels are: • Level 1—Quoted prices in active markets for identical assets or liabilities. • Level 2—Other significant observable inputs (including quoted prices in active markets for similar assets or liabilities) or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. • Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The fair value of an asset or liability is the price that would be received to sell that asset or paid to transfer that liability in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. Such valuation techniques are consistently applied. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability. The fair value disclosures below represent the Company’s estimates based on relevant market information and information about the financial instruments. Fair value estimates are based on judgments regarding current economic conditions, risk characteristics of the various instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in the above methodologies and assumptions could significantly affect the estimates. The following tables present fair values for assets and liabilities measured at fair value on a recurring basis: As of March 31, 2016 Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets: Available for sale securities: States and political subdivisions $ - $ 3,738 $ - $ 3,738 Collateralized mortgage obligations - 24,596 - 24,596 Mortgage-backed securities - 55,220 - 55,220 Other securities 12,795 - - 12,795 Total $ 12,795 $ 83,554 $ - $ 96,349 As of December 31, 2015 Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets: Available for sale securities: States and political subdivisions $ - $ 5,485 $ - $ 5,485 Collateralized mortgage obligations - 25,916 - 25,916 Mortgage-backed securities - 58,971 - 58,971 Other securities 12,692 - - 12,692 Total $ 12,692 $ 90,372 $ - $ 103,064 Certain assets and liabilities are measured at fair value on a nonrecurring basis; that is, the instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). These instruments include other real estate owned, repossessed assets, held to maturity debt securities, loans held for sale and impaired loans, which are included as loans held for investment. For the three months ended March 31, 2016, the Company had additions to other real estate owned of $13.0 million, all of which were still outstanding as of March 31, 2016. For the three months ended March 31, 2016, the Company had additions to impaired loans of $16.5 million, all of which were still outstanding as of March 31, 2016. The remaining financial assets and liabilities measured at fair value on a non-recurring basis that were recorded in 2016 and remained outstanding at March 31, 2016 were not significant. The following table presents carrying and fair value information of financial instruments as of the dates indicated: As of March 31, 2016 Carrying Estimated Fair Value Amount Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Cash and due from banks $ 334,592 $ 334,592 $ - $ - $ 334,592 Federal funds sold 1,386 1,386 - - 1,386 Held to maturity securities 9,352,355 - 9,457,901 - 9,457,901 Loans held for sale 23,717 - 23,717 - 23,717 Loans held for investment, net of allowance 9,546,977 - - 9,599,599 9,599,599 Other real estate owned 16,695 - 16,695 - 16,695 Liabilities Deposits: Noninterest-bearing $ 5,112,943 $ - $ 5,112,943 $ - $ 5,112,943 Interest-bearing 12,759,823 - 12,764,492 - 12,764,492 Other borrowings 186,225 - 186,893 - 186,893 Securities sold under repurchase agreements 304,204 - 304,207 - 304,207 Junior subordinated debentures 7,217 - 7,221 - 7,221 As of December 31, 2015 Carrying Estimated Fair Value Amount Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Cash and due from banks $ 562,544 $ 562,544 $ - $ - $ 562,544 Federal funds sold 1,418 1,418 - - 1,418 Held to maturity securities 9,399,363 - 9,393,175 - 9,393,175 Loans held for sale 23,933 - 23,933 - 23,933 Loans held for investment, net of allowance 9,333,272 - - 9,365,758 9,365,758 Other real estate owned 2,963 - 2,963 - 2,963 Liabilities Deposits: Noninterest-bearing $ 5,136,579 $ - $ 5,136,579 $ - $ 5,136,579 Interest-bearing 12,544,540 - 12,548,050 - 12,548,050 Other borrowings 491,399 - 492,061 - 492,061 Securities sold under repurchase agreements 315,253 - 315,241 - 315,241 Junior subordinated debentures - - - - - 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 Off-balance sheet financial instruments The fair value estimates presented herein are based on pertinent information available to management at March 31, 2016. 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	3 Months Ended
	Mar. 31, 2016
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 for the three months ended March 31, 2016 and the year ended December 31, 2015 were as follows: Goodwill Core Deposit Intangibles (Dollars in thousands) Balance as of December 31, 2014 $ 1,874,191 $ 58,947 Less: Amortization - (9,530 ) Add: Measurement period adjustments (5,364 ) - Balance as of December 31, 2015 1,868,827 49,417 Less: Amortization - (2,222 ) Add: Acquisition of Tradition Bancshares, Inc. 34,624 - Measurement period adjustments - - Balance as of March 31, 2016 $ 1,903,451 $ 47,195 Goodwill is recorded on the acquisition date of each entity. The Company may record subsequent adjustments to goodwill for amounts undeterminable at acquisition date, such as deferred taxes and real estate valuations, and therefore the goodwill amounts may change accordingly. The Company initially records the total premium paid on acquisitions as goodwill. After finalizing the valuation, core deposit intangibles are identified and reclassified from goodwill to core deposit intangibles on the balance sheet. This reclassification has no effect on total assets, liabilities, shareholders’ equity, net income or cash flows. Management performs an evaluation annually, and more frequently if a triggering event occurs, of whether any impairment of the goodwill and core deposit intangibles has occurred. If any such impairment is determined, a write-down is recorded. As of March 31, 2016, there was no impairment recorded on goodwill and core deposit 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 $2.2 million and $2.5 million for the three months ended March 31, 2016 and 2015, respectively. The estimated aggregate future amortization expense for core deposit intangibles remaining as of March 31, 2016 is as follows (dollars in thousands): Remaining 2016 $ 6,297 2017 6,327 2018 5,400 2019 4,546 2020 4,026 Thereafter 20,599 Total $ 47,195

Note 8 - Stock-based Compensati

Note 8 - Stock-based Compensation	3 Months Ended
	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	8. STOCK–BASED COMPENSATION At March 31, 2016, the Company had two stock-based employee compensation plans with awards outstanding. One of these plans adopted by the Company has expired and therefore no additional awards may be issued under that plan. During 2004, Bancshares’ Board of Directors established the Prosperity Bancshares, Inc. 2004 Stock Incentive Plan (the “2004 Plan”) which was approved by Bancshares’ shareholders and authorized the issuance of up to 1,250,000 shares of common stock upon the exercise of options granted under the 2004 Plan or upon the grant or exercise, as the case may be, of other awards granted under the 2004 Plan. The 2004 Plan provided for the granting of incentive and nonqualified stock options to employees and nonqualified stock options to directors who are 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, Bancshares’ Board of Directors established the Prosperity Bancshares, Inc. 2012 Stock Incentive Plan (the “2012 Plan”), which was approved by Bancshares’ shareholders and authorized the issuance of up to 1,250,000 shares of common stock upon the exercise of options granted under the 2012 Plan or pursuant to the grant or exercise, as the case may be, of other awards granted under the 2012 Plan, including restricted stock, stock appreciation rights, phantom stock awards and performance awards. A total of 307,001 shares have been granted under the 2012 Plan as of March 31, 2016. The Company received no cash from the exercise of stock options during the three-month periods ended March 31, 2016 and 2015. There was no tax benefit realized from option exercises of the stock-based payment arrangements during the three-month periods ended March 31, 2016 and 2015. As of March 31, 2016, there was $19.1 million of total unrecognized compensation expense related to stock-based compensation arrangements. That cost is expected to be recognized over a weighted average period of 1.56 years.

Note 9 - Contractual Obligation

Note 9 - Contractual Obligations and Off-balance Sheet Items	3 Months Ended
	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	9. CONTRACTUAL OBLIGATIONS AND OFF-BALANCE SHEET ITEMS Contractual Obligations The following table summarizes the Company’s contractual obligations and other commitments to make future payments as of March 31, 2016 (other than deposit obligations and securities sold under repurchase agreements). The Company’s future cash payments associated with its contractual obligations pursuant to its junior subordinated debt, FHLB notes payable and operating leases as of March 31, 2016 are summarized below. In February 2016, the Company gave irrevocable notice of its intent to redeem the outstanding junior subordinated debentures and completed the redemption in April 2016. The $7.2 million outstanding principal balance of the debentures and all accrued interest payable upon redemption is included in the “1 year or less” column below. Payments for FHLB notes payable include interest of $948 thousand that will be paid over the future periods. Payments related to leases are based on actual payments specified in underlying contracts. 1 year or less More than 1 year but less than 3 years 3 years or more but less than 5 years 5 years or more Total (Dollars in thousands) Junior subordinated debentures $ 7,254 $ - $ - $ - $ 7,254 Federal Home Loan Bank notes payable 180,932 5,078 902 261 187,173 Operating leases 6,310 8,658 5,650 7,634 28,252 Total $ 194,496 $ 13,736 $ 6,552 $ 7,895 $ 222,679 Off-Balance Sheet Items In the normal course of business, the Company enters into various transactions, which, in accordance with GAAP, are not included in its consolidated balance sheets. The Company enters into these transactions to meet the financing needs of its customers. These transactions include commitments to extend credit and standby letters of credit, which involve, to varying degrees, elements of credit risk and interest rate risk in excess of the amounts recognized in the consolidated balance sheets. The Company’s commitments associated with outstanding standby letters of credit and commitments to extend credit expiring by periods as of March 31, 2016 are summarized below. Since commitments associated with letters of credit and commitments to extend credit may expire unused, the amounts shown do not necessarily reflect the actual future cash funding requirements. 1 year or less More than 1 year but less than 3 years 3 years or more but less than 5 years 5 years or more Total (Dollars in thousands) Standby letters of credit $ 79,912 $ 5,145 $ 1,109 $ - $ 86,166 Commitments to extend credit 1,097,889 376,926 69,830 550,136 2,094,781 Total $ 1,177,801 $ 382,071 $ 70,939 $ 550,136 $ 2,180,947

Note 10 - Other Comprehensive I

Note 10 - Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2016
Disclosure Text Block [Abstract]
Comprehensive Income (Loss) Note [Text Block]	10. OTHER COMPREHENSIVE INCOME (LOSS) The tax effects allocated to each component of other comprehensive income (loss) were as follows: Three Months Ended March 31, 2016 2015 Before Tax Amount Tax Effect Net of Tax Amount Before Tax Amount Tax Effect Net of Tax Amount (Dollars in thousands) Other comprehensive income (loss): Securities available for sale: Change in unrealized gain during period $ 148 $ (52 ) $ 96 $ (442 ) $ 155 $ (287 ) Total securities available for sale 148 (52 ) 96 (442 ) 155 (287 ) Total other comprehensive income (loss) $ 148 $ (52 ) $ 96 $ (442 ) $ 155 $ (287 ) 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, 2016 $ 2,040 $ 2,040 Other comprehensive income 96 96 Balance at March 31, 2016 $ 2,136 $ 2,136 Balance at January 1, 2015 $ 3,729 $ 3,729 Other comprehensive loss (287 ) (287 ) Balance at March 31, 2015 $ 3,442 $ 3,442

Note 11 - Acquisitions

Note 11 - Acquisitions	3 Months Ended
	Mar. 31, 2016
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	11. ACQUISITIONS Acquisition of Tradition Bancshares, Inc. — Under the terms of the definitive agreement, Bancshares issued 679,528 shares of its common stock plus $39.0 million in cash for all outstanding shares of Tradition capital stock, for total merger consideration of $71.5 million, based on Bancshares’ closing stock price of $47.86 on December 31, 2015. As of March 31, 2016, total goodwill related to the Tradition acquisition was $34.6 million, which does not include subsequent fair value adjustments that are still being finalized. 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. The Company is currently in the process of obtaining fair values for certain acquired assets and assumed liabilities and, therefore, the estimates are preliminary.

Note 12 - Subsequent Events

Note 12 - Subsequent Events	3 Months Ended
	Mar. 31, 2016
Subsequent Events [Abstract]
Subsequent Events [Text Block]	1 2 . SUBSEQUENT EVENTS

Accounting Policies, by Policy

Accounting Policies, by Policy (Policies)	3 Months Ended
	Mar. 31, 2016
Accounting Policies [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	Accounting Standards Updates (“ASU”) ASU 2016-09, “Compensation - Stock Compensation (Topic 718) – Improvements to Employee Share-Based Payment Accounting . ” ASU 2016-02 , "Leases (Topic 842) . " ASU 2016-01, “Financial Instruments—Overall (Subtopic 825-10) – Recognition and Measurement of Financial Assets and Financial Liabilities.” ASU 2015-16, “Business Combinations (Topic 805) – Simplifying the Accounting for Measurement-Period Adjustments.” 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 . ASU 2014-09 , “Revenue from Contracts with Customers (Topic 606).”

Note 2 - Income Per Common Sh22

Note 2 - Income Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three Months Ended March 31, 2016 2015 Amount Per Share Amount Amount Per Share Amount (Amounts in thousands, except per share data) Net income $ 68,951 $ 73,641 Basic: Weighted average shares outstanding 70,174 $ 0.98 70,034 $ 1.05 Diluted: Add incremental shares for: Effect of dilutive securities - options 7 21 Total 70,181 $ 0.98 70,055 $ 1.05

Note 4 - Securities (Tables)

Note 4 - Securities (Tables)	3 Months Ended
	Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Marketable Securities [Table Text Block]	March 31, 2016 Amortized Gross Gross Fair (Dollars in thousands) Available for Sale States and political subdivisions $ 3,727 $ 11 $ - $ 3,738 Collateralized mortgage obligations 24,517 85 (6 ) 24,596 Mortgage-backed securities 52,230 2,999 (9 ) 55,220 Other securities 12,588 253 (46 ) 12,795 Total $ 93,062 $ 3,348 $ (61 ) $ 96,349 Held to Maturity U.S. Treasury securities and obligations of U.S. Government agencies $ 44,138 $ 1,208 $ - $ 45,346 States and political subdivisions 427,336 6,855 (444 ) 433,747 Collateralized mortgage obligations 1,028 20 (1 ) 1,047 Mortgage-backed securities 8,879,753 121,289 (23,380 ) 8,977,662 Other securities 100 - (1 ) 99 Total $ 9,352,355 $ 129,372 $ (23,826 ) $ 9,457,901 December 31, 2015 Amortized Gross Gross Fair (Dollars in thousands) Available for Sale States and political subdivisions $ 5,463 $ 22 $ - $ 5,485 Collateralized mortgage obligations 25,991 25 (100 ) 25,916 Mortgage-backed securities 55,884 3,098 (11 ) 58,971 Other securities 12,588 150 (46 ) 12,692 Total $ 99,926 $ 3,295 $ (157 ) $ 103,064 Held to Maturity U.S. Treasury securities and obligations of U.S. Government agencies $ 47,598 $ 798 $ - $ 48,396 States and political subdivisions 363,505 7,080 (542 ) 370,043 Collateralized mortgage obligations 2,107 17 (2 ) 2,122 Mortgage-backed securities 8,986,153 68,868 (82,407 ) 8,972,614 Other securities - - - - Total $ 9,399,363 $ 76,763 $ (82,951 ) $ 9,393,175
Schedule of Unrealized Loss on Investments [Table Text Block]	March 31, 2016 Less than 12 Months More than 12 Months Total Estimated Unrealized Estimated Unrealized Estimated Unrealized (Dollars in thousands) Available for Sale Collateralized mortgage obligations $ 1,752 $ (6 ) $ 1 $ - $ 1,753 $ (6 ) Mortgage-backed securities 1,236 (1 ) 2,338 (8 ) 3,574 (9 ) Other securities - - 1,691 (46 ) 1,691 (46 ) Total $ 2,988 $ (7 ) $ 4,030 $ (54 ) $ 7,018 $ (61 ) Held to Maturity States and political subdivisions $ 51,880 $ (333 ) $ 17,422 $ (111 ) $ 69,302 $ (444 ) Collateralized mortgage obligations - - 70 (1 ) 70 (1 ) Mortgage-backed securities 733,163 (3,258 ) 1,981,019 (20,122 ) 2,714,182 (23,380 ) Other securities 99 (1 ) - - 99 (1 ) Total $ 785,142 $ (3,592 ) $ 1,998,511 $ (20,234 ) $ 2,783,653 $ (23,826 ) December 31, 2015 Less than 12 Months More than 12 Months Total Estimated Unrealized Estimated Unrealized Estimate d Unrealized (Dollars in thousands) Available for Sale Collateralized mortgage obligations $ 14,331 $ (100 ) $ 1 $ - $ 14,332 $ (100 ) Mortgage-backed securities 793 (1 ) 2,465 (10 ) 3,258 (11 ) Other securities - - 1,691 (46 ) 1,691 (46 ) Total $ 15,124 $ (101 ) $ 4,157 $ (56 ) $ 19,281 $ (157 ) Held to Maturity States and political subdivisions $ 15,700 $ (82 ) $ 45,952 $ (460 ) $ 61,652 $ (542 ) Collateralized mortgage obligations 156 - 94 (2 ) 250 (2 ) Mortgage-backed securities 3,233,601 (36,016 ) 1,662,482 (46,391 ) 4,896,083 (82,407 ) Other securities - - - - - - Total $ 3,249,457 $ (36,098 ) $ 1,708,528 $ (46,853 ) $ 4,957,985 $ (82,951 )
Investments Classified by Contractual Maturity Date [Table Text Block]	Held to Maturity Available for Sale Amortized Fair Amortized Fair (Dollars in thousands) Due in one year or less $ 32,595 $ 32,643 $ 12,688 $ 12,898 Due after one year through five years 209,129 211,924 3,072 3,080 Due after five years through ten years 195,827 200,118 555 555 Due after ten years 34,023 34,507 - - Subtotal 471,574 479,192 16,315 16,533 Mortgage-backed securities and collateralized mortgage obligations 8,880,781 8,978,709 76,747 79,816 Total $ 9,352,355 $ 9,457,901 $ 93,062 $ 96,349

Note 5 - Loans and Allowance 24

Note 5 - Loans and Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2016
Loans And Allowance For Credit Losses [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	March 31, December 31, (Dollars in thousands) Residential mortgage loans held for sale $ 23,717 $ 23,933 Commercial and industrial 1,700,015 1,692,246 Real estate: Construction, land development and other land loans 1,173,524 1,073,198 1-4 family residential (including home equity) 2,639,472 2,616,732 Commercial real estate (including multi-family residential) 3,229,706 3,131,083 Farmland 451,111 434,349 Agriculture 190,182 214,469 Consumer and other 246,681 252,579 Total loans held for investment 9,630,691 9,414,656 Total $ 9,654,408 $ 9,438,589
Schedule of Related Party Loans [Table Text Block]	March 31, December 31, (Dollars in thousands) Beginning balance on January 1 $ 4,063 $ 4,940 New loans - 428 Repayments and reclassified related loans (32 ) (1,305 ) Ending balance $ 4,031 $ 4,063
Past Due Financing Receivables [Table Text Block]	March 31, 2016 Loans Past Due and Still Accruing 30-89 Days 90 or More Total Past Nonaccrual Current Total (Dollars in thousands) Construction, land development and other land loans $ 9,051 $ - $ 9,051 $ 1,670 $ 1,162,803 $ 1,173,524 Agriculture and agriculture real estate (includes farmland) 1,971 887 2,858 5,691 632,744 641,293 1-4 family (includes home equity) (1) 5,786 181 5,967 3,586 2,653,636 2,663,189 Commercial real estate (includes multi-family residential) 7,629 - 7,629 9,299 3,212,778 3,229,706 Commercial and industrial 9,471 25 9,496 18,621 1,671,898 1,700,015 Consumer and other 246 - 246 227 246,208 246,681 Total $ 34,154 $ 1,093 $ 35,247 $ 39,094 $ 9,580,067 $ 9,654,408 December 31, 2015 Loans Past Due and Still Accruing 30-89 Days 90 or More Total Past Nonaccrual Current Total (Dollars in thousands) Construction, land development and other land loans $ 4,097 $ - $ 4,097 $ 134 $ 1,068,967 $ 1,073,198 Agriculture and agriculture real estate (includes farmland) 946 - 946 208 647,664 648,818 1-4 family (includes home equity) (1) 4,748 220 4,968 1,894 2,633,803 2,640,665 Commercial real estate (includes multi-family residential) 12,922 - 12,922 15,535 3,102,626 3,131,083 Commercial and industrial 4,793 394 5,187 21,692 1,665,367 1,692,246 Consumer and other 1,274 - 1,274 248 251,057 252,579 Total $ 28,780 $ 614 $ 29,394 $ 39,711 $ 9,369,484 $ 9,438,589
Schedule of Nonperforming Assets [Table Text Block]	March 31, December 31, (Dollars in thousands) Nonaccrual loans (1) $ 39,094 $ 39,711 Accruing loans 90 or more days past due 1,093 614 Total nonperforming loans 40,187 40,325 Repossessed assets 161 171 Other real estate 16,695 2,963 Total nonperforming assets $ 57,043 $ 43,459 Nonperforming assets to total loans and other real estate 0.59 % 0.46 %
Carrying Value and Outstanding Balance for Purchased Credit Impaired Loans [Table Text Block]	March 31, December 31, (Dollars in thousands) PCI loans: Outstanding balance $ 73,590 $ 79,802 Less: discount 34,054 39,976 Recorded investment $ 39,536 $ 39,826
Summary of Changes in Accretable Yields of Acquired Loans [Table Text Block]	Three Months Ended March 31, 2016 2015 (Dollars in thousands) Balance at beginning of period $ 5,664 $ 9,867 Additions 10,222 - Reclassifications from nonaccretable 5,120 7,291 Accretion (7,831 ) (9,288 ) Balance at March 31 $ 13,175 $ 7,870
Carrying Value and Outstanding Balance for Non Purchased Credit Impaired Loans [Table Text Block]	March 31, December 31, 2015 (Dollars in thousands) Non-PCI loans: Outstanding balance $ 1,506,292 $ 1,430,501 Less: discount 50,509 54,734 Recorded investment $ 1,455,783 $ 1,375,767
Summary of Changes in Accretable Yields of Acquired Non PCI Loans[TableText Block]	Three Months Ended March 31, 2016 2015 (Dollars in thousands) Balance at beginning of period $ 54,734 $ 89,105 Additions 3,491 - Accretion charge-offs (1,053 ) (457 ) Accretion (6,663 ) (10,359 ) Balance at March 31 $ 50,509 $ 78,289
Impaired Financing Receivables [Table Text Block]	March 31, 2016 Recorded Unpaid Principal l Related Average (Dollars in thousands) With no related allowance recorded: Construction, land development and other land loans $ 19 $ 336 $ - $ 26 Agriculture and agriculture real estate (includes farmland) 5,517 12,520 - 2,768 1-4 family (includes home equity) 2,032 2,189 - 1,619 Commercial real estate (includes multi-family residential) 9,159 9,455 - 12,137 Commercial and industrial 769 1,050 - 1,062 Consumer and other 63 137 - 60 Total 17,559 25,687 - 17,672 With an allowance recorded: Construction, land development and other land loans 6 10 2 6 Agriculture and agriculture real estate (includes farmland) 174 192 37 181 1-4 family (includes home equity) 347 357 91 363 Commercial real estate (includes multi-family residential) - - - 131 Commercial and industrial 17,672 30,230 7,464 16,133 Consumer and other 164 205 27 172 Total 18,363 30,994 7,621 16,986 Total: Construction, land development and other land loans 25 346 2 32 Agriculture and agriculture real estate (includes farmland) 5,691 12,712 37 2,949 1-4 family (includes home equity) 2,379 2,546 91 1,982 Commercial real estate (includes multi-family residential) 9,159 9,455 - 12,268 Commercial and industrial 18,441 31,280 7,464 17,195 Consumer and other 227 342 27 232 $ 35,922 $ 56,681 $ 7,621 $ 34,658 December 31, 2015 Recorded Unpaid Related Average (Dollars in thousands) With no related allowance recorded: Construction, land development and other land loans $ 33 $ 346 $ - $ 142 Agriculture and agriculture real estate (includes farmland) 20 23 - 10 1-4 family (includes home equity) 1,206 1,365 - 1,458 Commercial real estate (includes multi-family residential) 15,115 15,398 - 10,104 Commercial and industrial 1,354 1,630 - 5,419 Consumer and other 58 131 - 4,101 Total 17,786 18,893 - 21,234 With an allowance recorded: Construction, land development and other land loans 7 11 2 141 Agriculture and agriculture real estate (includes farmland) 189 201 52 118 1-4 family (includes home equity) 379 386 93 902 Commercial real estate (includes multi-family residential) 262 1,857 262 162 Commercial and industrial 14,594 16,413 7,082 8,524 Consumer and other 181 220 44 208 Total 15,612 19,088 7,535 10,055 Total: Construction, land development and other land loans 40 357 2 283 Agriculture and agriculture real estate (includes farmland) 209 224 52 128 1-4 family (includes home equity) 1,585 1,751 93 2,360 Commercial real estate (includes multi-family residential) 15,377 17,255 262 10,266 Commercial and industrial 15,948 18,043 7,082 13,943 Consumer and other 239 351 44 4,309 $ 33,398 $ 37,981 $ 7,535 $ 31,289
Financing Receivable Credit Quality Indicators [Table Text Block]	Construction, Land Other Land Loans Agriculture and Farmland) 1-4 Family Home Equity) (1) Commercial Real Estate (includes Multi- Family Residential) Commercial and Industrial Consumer and Other Total (Dollars in thousands) Grade 1 $ - $ 12,574 $ - $ - $ 61,558 $ 44,866 $ 118,998 Grade 2 4,362 5,717 24,925 10,538 26,929 6,266 78,737 Grade 3 1,111,986 546,180 2,559,272 2,966,130 1,273,305 188,378 8,645,251 Grade 4 47,479 62,053 61,050 182,947 195,173 636 549,338 Grade 5 3,795 7,435 1,315 19,820 21,348 6,246 59,959 Grade 6 2,783 1,249 7,874 21,190 94,816 63 127,975 Grade 7 25 5,691 2,321 9,090 15,588 226 32,941 Grade 8 - - 58 69 1,546 - 1,673 Grade 9 - - - - - - - PCI Loans (2) 3,094 394 6,374 19,922 9,752 - 39,536 Total $ 1,173,524 $ 641,293 $ 2,663,189 $ 3,229,706 $ 1,700,015 $ 246,681 $ 9,654,408 Construction, Agriculture and 1-4 Family Commercial - Commercial Consumer and Total (Dollars in thousands) Grade 1 $ - $ 12,733 $ - $ - $ 57,625 $ 44,389 $ 114,747 Grade 2 3,975 5,603 27,272 24,965 27,755 34,668 124,238 Grade 3 1,034,792 553,782 2,539,282 2,861,872 1,355,887 162,892 8,508,507 Grade 4 29,831 67,453 58,172 164,924 123,772 3,395 447,547 Grade 5 2,431 7,191 1,261 20,078 68,618 6,908 106,487 Grade 6 1,209 1,452 7,824 26,237 28,005 88 64,815 Grade 7 40 209 1,526 15,377 12,487 239 29,878 Grade 8 - - 59 - 2,485 - 2,544 Grade 9 - - - - - - - PCI Loans (2) 920 395 5,269 17,630 15,612 - 39,826 Total $ 1,073,198 $ 648,818 $ 2,640,665 $ 3,131,083 $ 1,692,246 $ 252,579 $ 9,438,589
Schedule of Investment in Loans and Activity in Allowance for Credit Losses by Portfolio Segment [Table Text Block]	Construction, Agriculture 1-4 Family Commercial Commercial Consumer and Other Total (Dollars in thousands) Allowance for credit losses: Three Months Ended Balance January 1, 2016 $ 14,882 $ 3,845 $ 14,891 $ 12,996 $ 33,409 $ 1,361 $ 81,384 Provision for credit losses (703 ) 6,689 (297 ) (546 ) 8,150 707 14,000 Charge-offs (7 ) (7,025 ) (49 ) (59 ) (6,277 ) (848 ) (14,265 ) Recoveries 193 63 19 - 1,881 439 2,595 Net charge-offs 186 (6,962 ) (30 ) (59 ) (4,396 ) (409 ) (11,670 ) Balance March 31, 2016 $ 14,365 $ 3,572 $ 14,564 $ 12,391 $ 37,163 $ 1,659 $ 83,714 Allowance for credit losses: Three Months Ended Balance January 1, 2015 $ 15,825 $ 3,722 $ 16,377 $ 12,744 $ 30,002 $ 2,092 $ 80,762 Provision for credit losses 1,178 (523 ) 487 (173 ) 586 (305 ) 1,250 Charge-offs (151 ) - (98 ) (43 ) (728 ) (729 ) (1,749 ) Recoveries 6 78 12 10 224 370 700 Net charge-offs (145 ) 78 (86 ) (33 ) (504 ) (359 ) (1,049 ) Balance March 31, 2015 $ 16,858 $ 3,277 $ 16,778 $ 12,538 $ 30,084 $ 1,428 $ 80,963 Construction, Agriculture 1-4 Family Commercial Commercial Consumer and Other Total (Dollars in thousands) Allowance for credit losses related to: March 31, 2016 Individually evaluated for impairment $ 2 $ 37 $ 91 $ - $ 7,464 $ 27 $ 7,621 Collectively evaluated for impairment 14,363 3,535 14,473 12,391 28,531 1,632 74,925 PCI loans - - - - 1,168 - 1,168 Total allowance for credit losses $ 14,365 $ 3,572 $ 14,564 $ 12,391 $ 37,163 $ 1,659 $ 83,714 December 31, 2015 Individually evaluated for impairment $ 2 $ 52 $ 93 $ 262 $ 7,082 $ 44 $ 7,535 Collectively evaluated for impairment 14,880 3,793 14,798 12,734 25,491 1,317 73,013 PCI loans - - - - 836 - 836 Total allowance for credit losses $ 14,882 $ 3,845 $ 14,891 $ 12,996 $ 33,409 $ 1,361 $ 81,384 March 31, 2015 Individually evaluated for impairment $ 221 $ 21 $ 242 $ 507 $ 2,396 $ 93 $ 3,480 Collectively evaluated for impairment 16,637 3,256 16,536 12,031 26,276 1,335 76,071 PCI loans - - - - 1,412 - 1,412 Total allowance for credit losses $ 16,858 $ 3,277 $ 16,778 $ 12,538 $ 30,084 $ 1,428 $ 80,963 Construction, Land Development and Other Land Loans Agriculture and Agriculture Real Estate (includes Farmland) 1-4 Family (includes Home Equity) Commercial Real Estate (includes Multi-Family Residential) Commercial and Industrial Consumer and Other Total (Dollars in thousands) Recorded investment in loans: March 31, 2016 Individually evaluated for impairment $ 25 $ 5,691 $ 2,379 $ 9,159 $ 18,441 $ 227 $ 35,922 Collectively evaluated for impairment 1,170,405 635,208 2,630,719 3,200,625 1,671,822 246,454 9,555,233 PCI loans 3,094 394 6,374 19,922 9,752 - 39,536 Total loans evaluated for impairment $ 1,173,524 $ 641,293 $ 2,639,472 $ 3,229,706 $ 1,700,015 $ 246,681 $ 9,630,691 December 31, 2015 Individually evaluated for impairment $ 40 $ 209 $ 1,585 $ 15,377 $ 15,948 $ 239 $ 33,398 Collectively evaluated for impairment 1,072,238 648,214 2,609,878 3,098,076 1,660,686 252,340 9,341,432 PCI loans 920 395 5,269 17,630 15,612 - 39,826 Total loans evaluated for impairment $ 1,073,198 $ 648,818 $ 2,616,732 $ 3,131,083 $ 1,692,246 $ 252,579 $ 9,414,656 March 31, 2015 Individually evaluated for impairment $ 521 $ 232 $ 2,603 $ 6,190 $ 11,019 $ 366 $ 20,931 Collectively evaluated for impairment 1,039,052 556,103 2,523,613 2,992,782 1,693,080 280,496 9,085,126 PCI loans 1,272 504 5,844 22,684 19,022 - 49,326 Total loans evaluated for impairment $ 1,040,845 $ 556,839 $ 2,532,060 $ 3,021,656 $ 1,723,121 $ 280,862 $ 9,155,383
Troubled Debt Restructurings on Financing Receivables [Table Text Block]	Three Months Ended March 31, 2016 2015 Number of Loans Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Number of Loans Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment (Dollars in thousands) Troubled Debt Restructurings Construction, land development and other land loans - $ - $ - - $ - $ - Agriculture and agriculture real estate (includes farmland) - - - - - - 1-4 Family (includes home equity) - - - - - - Commercial real estate (includes multi-family residential) - - - - - - Commercial and industrial - - - - - - Consumer and other - - - 1 10 10 Total - $ - $ - 1 $ 10 $ 10

Note 6 - Fair Value (Tables)

Note 6 - Fair Value (Tables)	3 Months Ended
	Mar. 31, 2016
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	As of March 31, 2016 Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets: Available for sale securities: States and political subdivisions $ - $ 3,738 $ - $ 3,738 Collateralized mortgage obligations - 24,596 - 24,596 Mortgage-backed securities - 55,220 - 55,220 Other securities 12,795 - - 12,795 Total $ 12,795 $ 83,554 $ - $ 96,349 As of December 31, 2015 Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets: Available for sale securities: States and political subdivisions $ - $ 5,485 $ - $ 5,485 Collateralized mortgage obligations - 25,916 - 25,916 Mortgage-backed securities - 58,971 - 58,971 Other securities 12,692 - - 12,692 Total $ 12,692 $ 90,372 $ - $ 103,064
Fair Value, by Balance Sheet Grouping [Table Text Block]	As of March 31, 2016 Carrying Estimated Fair Value Amount Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Cash and due from banks $ 334,592 $ 334,592 $ - $ - $ 334,592 Federal funds sold 1,386 1,386 - - 1,386 Held to maturity securities 9,352,355 - 9,457,901 - 9,457,901 Loans held for sale 23,717 - 23,717 - 23,717 Loans held for investment, net of allowance 9,546,977 - - 9,599,599 9,599,599 Other real estate owned 16,695 - 16,695 - 16,695 Liabilities Deposits: Noninterest-bearing $ 5,112,943 $ - $ 5,112,943 $ - $ 5,112,943 Interest-bearing 12,759,823 - 12,764,492 - 12,764,492 Other borrowings 186,225 - 186,893 - 186,893 Securities sold under repurchase agreements 304,204 - 304,207 - 304,207 Junior subordinated debentures 7,217 - 7,221 - 7,221 As of December 31, 2015 Carrying Estimated Fair Value Amount Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Cash and due from banks $ 562,544 $ 562,544 $ - $ - $ 562,544 Federal funds sold 1,418 1,418 - - 1,418 Held to maturity securities 9,399,363 - 9,393,175 - 9,393,175 Loans held for sale 23,933 - 23,933 - 23,933 Loans held for investment, net of allowance 9,333,272 - - 9,365,758 9,365,758 Other real estate owned 2,963 - 2,963 - 2,963 Liabilities Deposits: Noninterest-bearing $ 5,136,579 $ - $ 5,136,579 $ - $ 5,136,579 Interest-bearing 12,544,540 - 12,548,050 - 12,548,050 Other borrowings 491,399 - 492,061 - 492,061 Securities sold under repurchase agreements 315,253 - 315,241 - 315,241 Junior subordinated debentures - - - - -

Note 7 - Goodwill and Core De26

Note 7 - Goodwill and Core Deposit Intangibles (Tables)	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets and Goodwill [Table Text Block]	Goodwill Core Deposit Intangibles (Dollars in thousands) Balance as of December 31, 2014 $ 1,874,191 $ 58,947 Less: Amortization - (9,530 ) Add: Measurement period adjustments (5,364 ) - Balance as of December 31, 2015 1,868,827 49,417 Less: Amortization - (2,222 ) Add: Acquisition of Tradition Bancshares, Inc. 34,624 - Measurement period adjustments - - Balance as of March 31, 2016 $ 1,903,451 $ 47,195
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Remaining 2016 $ 6,297 2017 6,327 2018 5,400 2019 4,546 2020 4,026 Thereafter 20,599 Total $ 47,195

Note 9 - Contractual Obligati27

Note 9 - Contractual Obligations and Off-balance Sheet Items (Tables)	3 Months Ended
	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Schedule of Contractual Obligations and Other Commitments [Table Text Block]	1 year or less More than 1 year but less than 3 years 3 years or more but less than 5 years 5 years or more Total (Dollars in thousands) Junior subordinated debentures $ 7,254 $ - $ - $ - $ 7,254 Federal Home Loan Bank notes payable 180,932 5,078 902 261 187,173 Operating leases 6,310 8,658 5,650 7,634 28,252 Total $ 194,496 $ 13,736 $ 6,552 $ 7,895 $ 222,679
Schedule of Line of Credit Facilities [Table Text Block]	1 year or less More than 1 year but less than 3 years 3 years or more but less than 5 years 5 years or more Total (Dollars in thousands) Standby letters of credit $ 79,912 $ 5,145 $ 1,109 $ - $ 86,166 Commitments to extend credit 1,097,889 376,926 69,830 550,136 2,094,781 Total $ 1,177,801 $ 382,071 $ 70,939 $ 550,136 $ 2,180,947

Note 10 - Other Comprehensive28

Note 10 - Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2016
Disclosure Text Block [Abstract]
Comprehensive Income (Loss) [Table Text Block]	Three Months Ended March 31, 2016 2015 Before Tax Amount Tax Effect Net of Tax Amount Before Tax Amount Tax Effect Net of Tax Amount (Dollars in thousands) Other comprehensive income (loss): Securities available for sale: Change in unrealized gain during period $ 148 $ (52 ) $ 96 $ (442 ) $ 155 $ (287 ) Total securities available for sale 148 (52 ) 96 (442 ) 155 (287 ) Total other comprehensive income (loss) $ 148 $ (52 ) $ 96 $ (442 ) $ 155 $ (287 )
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, 2016 $ 2,040 $ 2,040 Other comprehensive income 96 96 Balance at March 31, 2016 $ 2,136 $ 2,136 Balance at January 1, 2015 $ 3,729 $ 3,729 Other comprehensive loss (287 ) (287 ) Balance at March 31, 2015 $ 3,442 $ 3,442

Note 2 - Income Per Common Sh29

Note 2 - Income Per Common Share (Details) - shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
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

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
	Mar. 31, 2016	Mar. 31, 2015
Computation of Basic and Diluted Earnings Per Share [Abstract]
Net income (in Dollars)	$ 68,951	$ 73,641
Basic:
Weighted average shares outstanding	70,174	70,034
Weighted average shares outstanding (in Dollars per share)	$ 0.98	$ 1.05
Add incremental shares for:
Effect of dilutive securities - options	7	21
Total	70,181	70,055
Total (in Dollars per share)	$ 0.98	$ 1.05

Note 4 - Securities (Details)

Note 4 - Securities (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2016USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2015USD ($)
Note 4 - Securities (Details) [Line Items]
Number of Investment Securities Segments	2
Other than Temporary Impairment Losses, Investments	$ 0
Securities in Unrealized Loss Positions Qualitative Disclosure Number of Positions Greater Than or Equal to One Year	454		474
Gain (Loss) on Sale of Securities, Net	$ 0	$ 0
Available-for-sale Securities, Amortized Cost Basis	93,062,000		$ 99,926,000
Available-for-sale Securities	96,349,000		103,064,000
Collateralized Securities [Member]
Note 4 - Securities (Details) [Line Items]
Available-for-sale Securities, Amortized Cost Basis	6,080,000,000		5,810,000,000
Available-for-sale Securities	$ 6,140,000,000		$ 5,790,000,000
Stockholders' Equity, Total [Member] | Securities Concentration Risk [Member]
Note 4 - Securities (Details) [Line Items]
Concentration Risk, Percentage	10.00%		10.00%

Note 4 - Securities (Details) -

Note 4 - Securities (Details) - Investment Securities - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Available for Sale
Available for Sale, Amortized Cost	$ 93,062	$ 99,926
Available for Sale, Gross Unrealized Gains	3,348	3,295
Available for Sale, Gross Unrealized Losses	(61)	(157)
Available for Sale, Fair Value	96,349	103,064
Held to Maturity
Held to Maturity, Amortized Cost	9,352,355	9,399,363
Held to Maturity, Gross Unrealized Gains	129,372	76,763
Held to Maturity, Gross Unrealized Losses	(23,826)	(82,951)
Held to Maturity, Fair Value	9,457,901	9,393,175
US States and Political Subdivisions Debt Securities [Member]
Available for Sale
Available for Sale, Amortized Cost	3,727	5,463
Available for Sale, Gross Unrealized Gains	11	22
Available for Sale, Gross Unrealized Losses	0	0
Available for Sale, Fair Value	3,738	5,485
Held to Maturity
Held to Maturity, Amortized Cost	427,336	363,505
Held to Maturity, Gross Unrealized Gains	6,855	7,080
Held to Maturity, Gross Unrealized Losses	(444)	(542)
Held to Maturity, Fair Value	433,747	370,043
Collateralized Mortgage Obligations [Member]
Available for Sale
Available for Sale, Amortized Cost	24,517	25,991
Available for Sale, Gross Unrealized Gains	85	25
Available for Sale, Gross Unrealized Losses	(6)	(100)
Available for Sale, Fair Value	24,596	25,916
Held to Maturity
Held to Maturity, Amortized Cost	1,028	2,107
Held to Maturity, Gross Unrealized Gains	20	17
Held to Maturity, Gross Unrealized Losses	(1)	(2)
Held to Maturity, Fair Value	1,047	2,122
Mortgage-backed Securities [Member]
Available for Sale
Available for Sale, Amortized Cost	52,230	55,884
Available for Sale, Gross Unrealized Gains	2,999	3,098
Available for Sale, Gross Unrealized Losses	(9)	(11)
Available for Sale, Fair Value	55,220	58,971
Held to Maturity
Held to Maturity, Amortized Cost	8,879,753	8,986,153
Held to Maturity, Gross Unrealized Gains	121,289	68,868
Held to Maturity, Gross Unrealized Losses	(23,380)	(82,407)
Held to Maturity, Fair Value	8,977,662	8,972,614
Other Securities [Member]
Available for Sale
Available for Sale, Amortized Cost	12,588	12,588
Available for Sale, Gross Unrealized Gains	253	150
Available for Sale, Gross Unrealized Losses	(46)	(46)
Available for Sale, Fair Value	12,795	12,692
Held to Maturity
Held to Maturity, Amortized Cost	100	0
Held to Maturity, Gross Unrealized Gains	0	0
Held to Maturity, Gross Unrealized Losses	(1)	0
Held to Maturity, Fair Value	99	0
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Held to Maturity
Held to Maturity, Amortized Cost	44,138	47,598
Held to Maturity, Gross Unrealized Gains	1,208	798
Held to Maturity, Gross Unrealized Losses	0
Held to Maturity, Fair Value	$ 45,346	$ 48,396

Note 4 - Securities (Details)33

Note 4 - Securities (Details) - Securities in a Continuous Loss Position - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Available for Sale
Available for Sale, Estimated Fair Value, Less than 12 Months	$ 2,988	$ 15,124
Available for Sale, Unrealized Losses, Less than 12 Months	(7)	(101)
Available for Sale, Estimated Fair Value, More than 12 Months	4,030	4,157
Available for Sale, Unrealized Losses, More than 12 Months	(54)	(56)
Available for Sale, Estimated Fair Value, Total	7,018	19,281
Available for Sale, Unrealized Losses, Total	(61)	(157)
Held to Maturity
Held to Maturity, Estimated Fair Value, Less than 12 Months	785,142	3,249,457
Held to Maturity, Unrealized Losses, Less than 12 Months	(3,592)	(36,098)
Held to Maturity, Estimated Fair Value, More than 12 Months	1,998,511	1,708,528
Held to Maturity, Unrealized Losses, More than 12 Months	(20,234)	(46,853)
Held to Maturity, Estimated Fair Value, Total	2,783,653	4,957,985
Held to Maturity, Unrealized Losses, Total	(23,826)	(82,951)
Collateralized Mortgage Obligations [Member]
Available for Sale
Available for Sale, Estimated Fair Value, Less than 12 Months	1,752	14,331
Available for Sale, Unrealized Losses, Less than 12 Months	(6)	(100)
Available for Sale, Estimated Fair Value, More than 12 Months	1	1
Available for Sale, Unrealized Losses, More than 12 Months	0	0
Available for Sale, Estimated Fair Value, Total	1,753	14,332
Available for Sale, Unrealized Losses, Total	(6)	(100)
Held to Maturity
Held to Maturity, Estimated Fair Value, Less than 12 Months	0	156
Held to Maturity, Unrealized Losses, Less than 12 Months	0	0
Held to Maturity, Estimated Fair Value, More than 12 Months	70	94
Held to Maturity, Unrealized Losses, More than 12 Months	(1)	(2)
Held to Maturity, Estimated Fair Value, Total	70	250
Held to Maturity, Unrealized Losses, Total	(1)	(2)
Mortgage-backed Securities [Member]
Available for Sale
Available for Sale, Estimated Fair Value, Less than 12 Months	1,236	793
Available for Sale, Unrealized Losses, Less than 12 Months	(1)	(1)
Available for Sale, Estimated Fair Value, More than 12 Months	2,338	2,465
Available for Sale, Unrealized Losses, More than 12 Months	(8)	(10)
Available for Sale, Estimated Fair Value, Total	3,574	3,258
Available for Sale, Unrealized Losses, Total	(9)	(11)
Held to Maturity
Held to Maturity, Estimated Fair Value, Less than 12 Months	733,163	3,233,601
Held to Maturity, Unrealized Losses, Less than 12 Months	(3,258)	(36,016)
Held to Maturity, Estimated Fair Value, More than 12 Months	1,981,019	1,662,482
Held to Maturity, Unrealized Losses, More than 12 Months	(20,122)	(46,391)
Held to Maturity, Estimated Fair Value, Total	2,714,182	4,896,083
Held to Maturity, Unrealized Losses, Total	(23,380)	(82,407)
Other Securities [Member]
Available for Sale
Available for Sale, Estimated Fair Value, Less than 12 Months	0	0
Available for Sale, Unrealized Losses, Less than 12 Months	0	0
Available for Sale, Estimated Fair Value, More than 12 Months	1,691	1,691
Available for Sale, Unrealized Losses, More than 12 Months	(46)	(46)
Available for Sale, Estimated Fair Value, Total	1,691	1,691
Available for Sale, Unrealized Losses, Total	(46)	(46)
Held to Maturity
Held to Maturity, Estimated Fair Value, Less than 12 Months	99	0
Held to Maturity, Unrealized Losses, Less than 12 Months	(1)	0
Held to Maturity, Estimated Fair Value, More than 12 Months	0	0
Held to Maturity, Unrealized Losses, More than 12 Months	0	0
Held to Maturity, Estimated Fair Value, Total	99	0
Held to Maturity, Unrealized Losses, Total	(1)	0
US States and Political Subdivisions Debt Securities [Member]
Held to Maturity
Held to Maturity, Estimated Fair Value, Less than 12 Months	51,880	15,700
Held to Maturity, Unrealized Losses, Less than 12 Months	(333)	(82)
Held to Maturity, Estimated Fair Value, More than 12 Months	17,422	45,952
Held to Maturity, Unrealized Losses, More than 12 Months	(111)	(460)
Held to Maturity, Estimated Fair Value, Total	69,302	61,652
Held to Maturity, Unrealized Losses, Total	$ (444)	$ (542)

Note 4 - Securities (Details)34

Note 4 - Securities (Details) - Investment Securities by Contractual Maturity - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Investment Securities by Contractual Maturity [Abstract]
Due in one year or less	$ 32,595
Due in one year or less	32,643
Due in one year or less	12,688
Due in one year or less	12,898
Due after one year through five years	209,129
Due after one year through five years	211,924
Due after one year through five years	3,072
Due after one year through five years	3,080
Due after five years through ten years	195,827
Due after five years through ten years	200,118
Due after five years through ten years	555
Due after five years through ten years	555
Due after ten years	34,023
Due after ten years	34,507
Due after ten years	0
Due after ten years	0
Subtotal	471,574
Subtotal	479,192
Subtotal	16,315
Subtotal	16,533
Mortgage-backed securities and collateralized mortgage obligations	8,880,781
Mortgage-backed securities and collateralized mortgage obligations	8,978,709
Mortgage-backed securities and collateralized mortgage obligations	76,747
Mortgage-backed securities and collateralized mortgage obligations	79,816
Total	9,352,355	$ 9,399,363
Total	9,457,901	9,393,175
Total	93,062
Total	$ 96,349	$ 103,064

Note 5 - Loans and Allowance 35

Note 5 - Loans and Allowance for Credit Losses (Details)		3 Months Ended
		Mar. 31, 2016USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Loans Related to Single Industry on Loans		10.00%
Loans and Leases Receivable, Related Parties		$ 4,031,000		$ 4,063,000	$ 4,940,000
Minimum Period for Ceases Accruing Interest		90 days
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage		$ 23,717,000		23,933,000
Financing Receivable, Recorded Investment, Nonaccrual Status		$ 39,094,000		$ 39,711,000
Financing Receivable Ratio of Nonperforming Loans to All Loans and Other Real Estate		0.59%		0.46%
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans		$ 1,000,000	$ 910,000
Impaired Financing Receivable, Interest Income, Accrual Method		0
Loans Receivable, Fair Value Disclosure		4,400,000		$ 7,300,000
Financing Receivable, Allowance for Credit Losses		$ 83,700,000		$ 81,400,000
Allowance for Credit Losses as Percentage of Loans		0.87%		0.86%
Financing Receivable, Modifications, Recorded Investment		$ 593,000	$ 766,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts		0
Loan to be Considered as Payment Default in Period		90 days
Financing Receivable, Modifications, Number of Contracts		0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment			$ 10,000
Nonperforming Financial Instruments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	$ 39,094,000		$ 39,711,000
Other Real Estate, Foreclosed Assets, and Repossessed Assets		57,043,000		43,459,000
Residential Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage		23,700,000	$ 10,600,000	23,900,000
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage		23,717,000		23,933,000
Troubled Debt Restructuring [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		593,000		681,000
Substandard [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Fair Value Disclosure		4,400,000		7,300,000
Substandard [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | With Specific Reserves Allocated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Fair Value Disclosure		$ 1,300,000		$ 976,000
[1]	Includes troubled debt restructurings of $593 thousand and $681 thousand as of March 31, 2016 and December 31, 2015, 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		Mar. 31, 2016		Dec. 31, 2015		Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential mortgage loans held for sale		$ 23,717		$ 23,933
Total loans held for investment		9,630,691		9,414,656		$ 9,155,383
Total		9,654,408		9,438,589
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential mortgage loans held for sale		23,717		23,933
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment		1,700,015		1,692,246		1,723,121
Total		1,700,015		1,692,246
Construction, Land Development and Other Land Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment		1,173,524		1,073,198		1,040,845
Total		1,173,524		1,073,198
1-4 Family Residential (Includes Home Equity) [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential mortgage loans held for sale		23,700		23,900
Total loans held for investment		2,639,472		2,616,732		2,532,060
Total	[1]	2,663,189	[2]	2,640,665	[3]
Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment		3,229,706		3,131,083		3,021,656
Total		3,229,706		3,131,083
Farmland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment		451,111		434,349
Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment		190,182		214,469
Consumer and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment		246,681		252,579		$ 280,862
Total		$ 246,681		$ 252,579
[1]	Includes $23.7 million and $23.9 million of residential mortgage loans held for sale at March 31, 2016 and December 31, 2015, respectively.
[2]	Includes $23.7 million of residential mortgage loans held for sale at March 31, 2016.
[3]	Includes $23.9 million of residential mortgage loans held for sale at December 31, 2015.

Note 5 - Loans and Allowance 37

Note 5 - Loans and Allowance for Credit Losses (Details) - Related Party Loans - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Related Party Loans [Abstract]
Beginning balance on January 1	$ 4,063	$ 4,940
New loans	0	428
Repayments and reclassified related loans	(32)	(1,305)
Ending balance	$ 4,031	$ 4,063

Note 5 - Loans and Allowance 38

Note 5 - Loans and Allowance for Credit Losses (Details) - Past Due Loans - USD ($) $ in Thousands		Mar. 31, 2016		Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		$ 35,247		$ 29,394
Nonaccrual loans		39,094		39,711
Current loans		9,580,067		9,369,484
Total loans		9,654,408		9,438,589
Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		34,154		28,780
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		1,093		614
Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		9,051		4,097
Nonaccrual loans		1,670		134
Current loans		1,162,803		1,068,967
Total loans		1,173,524		1,073,198
Construction, Land Development and Other Land Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		9,051		4,097
Construction, Land Development and Other Land Loans [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		0		0
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		2,858		946
Nonaccrual loans		5,691		208
Current loans		632,744		647,664
Total loans		641,293		648,818
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		1,971		946
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		887		0
1-4 Family Residential (Includes Home Equity) [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing	[1]	5,967		4,968
Nonaccrual loans	[1]	3,586		1,894
Current loans	[1]	2,653,636		2,633,803
Total loans	[1]	2,663,189	[2]	2,640,665	[3]
1-4 Family Residential (Includes Home Equity) [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]	5,786		4,748
1-4 Family Residential (Includes Home Equity) [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]	181		220
Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		7,629		12,922
Nonaccrual loans		9,299		15,535
Current loans		3,212,778		3,102,626
Total loans		3,229,706		3,131,083
Commercial Real Estate (Includes Multi-Family Residential) [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		7,629		12,922
Commercial Real Estate (Includes Multi-Family Residential) [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		0		0
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		9,496		5,187
Nonaccrual loans		18,621		21,692
Current loans		1,671,898		1,665,367
Total loans		1,700,015		1,692,246
Commercial and Industrial [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		9,471		4,793
Commercial and Industrial [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		25		394
Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		246		1,274
Nonaccrual loans		227		248
Current loans		246,208		251,057
Total loans		246,681		252,579
Consumer and Other [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		246		1,274
Consumer and Other [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		$ 0		$ 0
[1]	Includes $23.7 million and $23.9 million of residential mortgage loans held for sale at March 31, 2016 and December 31, 2015, respectively.
[2]	Includes $23.7 million of residential mortgage loans held for sale at March 31, 2016.
[3]	Includes $23.9 million of residential mortgage loans held for sale at December 31, 2015.

Note 5 - Loans and Allowance 39

Note 5 - Loans and Allowance for Credit Losses (Details) - Past Due Loans (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable held-for-sale, net, not part of disposal group, mortgage	$ 23,717	$ 23,933
1-4 Family Residential (Includes Home Equity) [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable held-for-sale, net, not part of disposal group, mortgage	23,700	23,900
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable held-for-sale, net, not part of disposal group, mortgage	$ 23,717	$ 23,933

Note 5 - Loans and Allowance 40

Note 5 - Loans and Allowance for Credit Losses (Details) - Nonperforming Assets - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans (1)		$ 39,094	$ 39,711
Other real estate		16,695	2,963
Troubled Debt Restructuring [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans (1)		593	681
Nonperforming Financial Instruments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans (1)	[1]	39,094	39,711
Accruing loans 90 or more days past due		1,093	614
Total nonperforming loans		40,187	40,325
Repossessed assets		161	171
Other real estate		16,695	2,963
Total nonperforming assets		$ 57,043	$ 43,459
Nonperforming assets to total loans and other real estate		0.59%	0.46%
[1]	Includes troubled debt restructurings of $593 thousand and $681 thousand as of March 31, 2016 and December 31, 2015, respectively.

Note 5 - Loans and Allowance 41

Note 5 - Loans and Allowance for Credit Losses (Details) - Nonperforming Assets (Parentheticals) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financin Receivable, Recorded Investment, Nonaccrual Status		$ 39,094	$ 39,711
Troubled Debt Restructuring [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financin Receivable, Recorded Investment, Nonaccrual Status		593	681
Nonperforming Financial Instruments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financin Receivable, Recorded Investment, Nonaccrual Status	[1]	$ 39,094	$ 39,711
[1]	Includes troubled debt restructurings of $593 thousand and $681 thousand as of March 31, 2016 and December 31, 2015, respectively.

Note 5 - Loans and Allowance 42

Note 5 - Loans and Allowance for Credit Losses (Details) - Purchased Credit Impaired Loans - Receivables Acquired with Deteriorated Credit Quality [Member] - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
PCI loans:
Outstanding balance	$ 73,590	$ 79,802
Less: discount	34,054	39,976
Recorded investment	$ 39,536	$ 39,826

Note 5 - Loans and Allowance 43

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
	Mar. 31, 2016	Mar. 31, 2015
Note 5 - Loans and Allowance for Credit Losses (Details) - Changes in Accretable Yield for PCI Loans [Line Items]
Balance	$ 5,664	$ 9,867
Additions	10,222	0
Reclassifications from nonaccretable	5,120	7,291
Accretion	(7,831)	(9,288)
Balance	$ 13,175	$ 7,870

Note 5 - Loans and Allowance 44

Note 5 - Loans and Allowance for Credit Losses (Details) - Non Purchased Credit Impaired Loans - Non PCI Loans [Member] - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Non-PCI loans:
Outstanding balance	$ 1,506,292	$ 1,430,501
Less: discount	50,509	54,734
Recorded investment	$ 1,455,783	$ 1,375,767

Note 5 - Loans and Allowance 45

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
	Mar. 31, 2016	Mar. 31, 2015
Note 5 - Loans and Allowance for Credit Losses (Details) - Changes in Accretable Yield for Non PCI Loans [Line Items]
Balance	$ 54,734	$ 89,105
Additions	3,491	0
Accretion charge-offs	(1,053)	(457)
Accretion	(6,663)	(10,359)
Balance	$ 50,509	$ 78,289

Note 5 - Loans and Allowance 46

Note 5 - Loans and Allowance for Credit Losses (Details) - Impaired Loans - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
With no related allowance recorded:
Impaired loans with no related allowance, recorded investment	$ 17,559	$ 17,786
Impaired loans with no related allowance, unpaid principal balance	25,687	18,893
Impaired loans with no related allowance, average recorded investment	17,672	21,234
With an allowance recorded:
Impaired loans with related allowance, recorded investment	18,363	15,612
Impaired loans with related allowance, unpaid principal balance	30,994	19,088
Impaired loans with related allowance, related allowance	7,621	7,535
Impaired loans with related allowance, average recorded investment	16,986	10,055
Total:
Impaired loans, recorded investment	35,922	33,398
Impaired loans, unpaid principal balance	56,681	37,981
Impaired loans, related allowance	7,621	7,535
Impaired loans, average recorded investment	34,658	31,289
Construction, Land Development and Other Land Loans [Member]
With no related allowance recorded:
Impaired loans with no related allowance, recorded investment	19	33
Impaired loans with no related allowance, unpaid principal balance	336	346
Impaired loans with no related allowance, average recorded investment	26	142
With an allowance recorded:
Impaired loans with related allowance, recorded investment	6	7
Impaired loans with related allowance, unpaid principal balance	10	11
Impaired loans with related allowance, related allowance	2	2
Impaired loans with related allowance, average recorded investment	6	141
Total:
Impaired loans, recorded investment	25	40
Impaired loans, unpaid principal balance	346	357
Impaired loans, related allowance	2	2
Impaired loans, average recorded investment	32	283
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
With no related allowance recorded:
Impaired loans with no related allowance, recorded investment	5,517	20
Impaired loans with no related allowance, unpaid principal balance	12,520	23
Impaired loans with no related allowance, average recorded investment	2,768	10
With an allowance recorded:
Impaired loans with related allowance, recorded investment	174	189
Impaired loans with related allowance, unpaid principal balance	192	201
Impaired loans with related allowance, related allowance	37	52
Impaired loans with related allowance, average recorded investment	181	118
Total:
Impaired loans, recorded investment	5,691	209
Impaired loans, unpaid principal balance	12,712	224
Impaired loans, related allowance	37	52
Impaired loans, average recorded investment	2,949	128
1-4 Family Residential (Includes Home Equity) [Member]
With no related allowance recorded:
Impaired loans with no related allowance, recorded investment	2,032	1,206
Impaired loans with no related allowance, unpaid principal balance	2,189	1,365
Impaired loans with no related allowance, average recorded investment	1,619	1,458
With an allowance recorded:
Impaired loans with related allowance, recorded investment	347	379
Impaired loans with related allowance, unpaid principal balance	357	386
Impaired loans with related allowance, related allowance	91	93
Impaired loans with related allowance, average recorded investment	363	902
Total:
Impaired loans, recorded investment	2,379	1,585
Impaired loans, unpaid principal balance	2,546	1,751
Impaired loans, related allowance	91	93
Impaired loans, average recorded investment	1,982	2,360
Commercial Real Estate (Includes Multi-Family Residential) [Member]
With no related allowance recorded:
Impaired loans with no related allowance, recorded investment	9,159	15,115
Impaired loans with no related allowance, unpaid principal balance	9,455	15,398
Impaired loans with no related allowance, average recorded investment	12,137	10,104
With an allowance recorded:
Impaired loans with related allowance, recorded investment	0	262
Impaired loans with related allowance, unpaid principal balance	0	1,857
Impaired loans with related allowance, related allowance	0	262
Impaired loans with related allowance, average recorded investment	131	162
Total:
Impaired loans, recorded investment	9,159	15,377
Impaired loans, unpaid principal balance	9,455	17,255
Impaired loans, related allowance	0	262
Impaired loans, average recorded investment	12,268	10,266
Commercial and Industrial [Member]
With no related allowance recorded:
Impaired loans with no related allowance, recorded investment	769	1,354
Impaired loans with no related allowance, unpaid principal balance	1,050	1,630
Impaired loans with no related allowance, average recorded investment	1,062	5,419
With an allowance recorded:
Impaired loans with related allowance, recorded investment	17,672	14,594
Impaired loans with related allowance, unpaid principal balance	30,230	16,413
Impaired loans with related allowance, related allowance	7,464	7,082
Impaired loans with related allowance, average recorded investment	16,133	8,524
Total:
Impaired loans, recorded investment	18,441	15,948
Impaired loans, unpaid principal balance	31,280	18,043
Impaired loans, related allowance	7,464	7,082
Impaired loans, average recorded investment	17,195	13,943
Consumer and Other [Member]
With no related allowance recorded:
Impaired loans with no related allowance, recorded investment	63	58
Impaired loans with no related allowance, unpaid principal balance	137	131
Impaired loans with no related allowance, average recorded investment	60	4,101
With an allowance recorded:
Impaired loans with related allowance, recorded investment	164	181
Impaired loans with related allowance, unpaid principal balance	205	220
Impaired loans with related allowance, related allowance	27	44
Impaired loans with related allowance, average recorded investment	172	208
Total:
Impaired loans, recorded investment	227	239
Impaired loans, unpaid principal balance	342	351
Impaired loans, related allowance	27	44
Impaired loans, average recorded investment	$ 232	$ 4,309

Note 5 - Loans and Allowance 47

Note 5 - Loans and Allowance for Credit Losses (Details) - Risk Grades and Impaired Loans by Class of Loan - USD ($) $ in Thousands		Mar. 31, 2016		Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 9,654,408		$ 9,438,589
Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		118,998		114,747
Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		78,737		124,238
Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		8,645,251		8,508,507
Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		549,338		447,547
Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		59,959		106,487
Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		127,975		64,815
Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		32,941		29,878
Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		1,673		2,544
PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		39,536	[1]	39,826	[2]
Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		1,173,524		1,073,198
Construction, Land Development and Other Land Loans [Member] | Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans				0
Construction, Land Development and Other Land Loans [Member] | Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		4,362		3,975
Construction, Land Development and Other Land Loans [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		1,111,986		1,034,792
Construction, Land Development and Other Land Loans [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		47,479		29,831
Construction, Land Development and Other Land Loans [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		3,795		2,431
Construction, Land Development and Other Land Loans [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		2,783		1,209
Construction, Land Development and Other Land Loans [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		25		40
Construction, Land Development and Other Land Loans [Member] | Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		0		0
Construction, Land Development and Other Land Loans [Member] | Grade 9 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		0		0
Construction, Land Development and Other Land Loans [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		3,094	[1]	920	[2]
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		641,293		648,818
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		12,574		12,733
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		5,717		5,603
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		546,180		553,782
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		62,053		67,453
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		7,435		7,191
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		1,249		1,452
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		5,691		209
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		0		0
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Grade 9 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		0		0
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		394	[1]	395	[2]
1-4 Family Residential (Includes Home Equity) [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[3]	$ 2,663,189	[4]	2,640,665	[5]
1-4 Family Residential (Includes Home Equity) [Member] | Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans			[4]	0	[5]
1-4 Family Residential (Includes Home Equity) [Member] | Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 24,925	[4]	27,272	[5]
1-4 Family Residential (Includes Home Equity) [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		2,559,272	[4]	2,539,282	[5]
1-4 Family Residential (Includes Home Equity) [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		61,050	[4]	58,172	[5]
1-4 Family Residential (Includes Home Equity) [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		1,315	[4]	1,261	[5]
1-4 Family Residential (Includes Home Equity) [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		7,874	[4]	7,824	[5]
1-4 Family Residential (Includes Home Equity) [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		2,321	[4]	1,526	[5]
1-4 Family Residential (Includes Home Equity) [Member] | Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		58	[4]	59	[5]
1-4 Family Residential (Includes Home Equity) [Member] | Grade 9 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		0	[4]	0	[5]
1-4 Family Residential (Includes Home Equity) [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		6,374	[1],[4]	5,269	[2],[5]
Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		3,229,706		3,131,083
Commercial Real Estate (Includes Multi-Family Residential) [Member] | Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans				0
Commercial Real Estate (Includes Multi-Family Residential) [Member] | Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		10,538		24,965
Commercial Real Estate (Includes Multi-Family Residential) [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		2,966,130		2,861,872
Commercial Real Estate (Includes Multi-Family Residential) [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		182,947		164,924
Commercial Real Estate (Includes Multi-Family Residential) [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		19,820		20,078
Commercial Real Estate (Includes Multi-Family Residential) [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		21,190		26,237
Commercial Real Estate (Includes Multi-Family Residential) [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		9,090		15,377
Commercial Real Estate (Includes Multi-Family Residential) [Member] | Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		69		0
Commercial Real Estate (Includes Multi-Family Residential) [Member] | Grade 9 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		0		0
Commercial Real Estate (Includes Multi-Family Residential) [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		19,922	[1]	17,630	[2]
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		1,700,015		1,692,246
Commercial and Industrial [Member] | Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		61,558		57,625
Commercial and Industrial [Member] | Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		26,929		27,755
Commercial and Industrial [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		1,273,305		1,355,887
Commercial and Industrial [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		195,173		123,772
Commercial and Industrial [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		21,348		68,618
Commercial and Industrial [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		94,816		28,005
Commercial and Industrial [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		15,588		12,487
Commercial and Industrial [Member] | Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		1,546		2,485
Commercial and Industrial [Member] | Grade 9 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		0		0
Commercial and Industrial [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		9,752	[1]	15,612	[2]
Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		246,681		252,579
Consumer and Other [Member] | Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		44,866		44,389
Consumer and Other [Member] | Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		6,266		34,668
Consumer and Other [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		188,378		162,892
Consumer and Other [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		636		3,395
Consumer and Other [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		6,246		6,908
Consumer and Other [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		63		88
Consumer and Other [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		226		239
Consumer and Other [Member] | Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		0		0
Consumer and Other [Member] | Grade 9 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		0		0
Consumer and Other [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 0	[1]	$ 0	[2]
[1]	Of the total PCI loans, $4.4 million were classified as substandard at March 31, 2016 which includes $1.3 million with specific reservesallocated to them.
[2]	Of the total PCI loans, $7.3 million were classified as substandard at December 31, 2015, which includes $976 thousand with specific reservesallocated to them.
[3]	Includes $23.7 million and $23.9 million of residential mortgage loans held for sale at March 31, 2016 and December 31, 2015, respectively.
[4]	Includes $23.7 million of residential mortgage loans held for sale at March 31, 2016.
[5]	Includes $23.9 million of residential mortgage loans held for sale at December 31, 2015.

Note 5 - Loans and Allowance 48

Note 5 - Loans and Allowance for Credit Losses (Details) - Risk Grades and Impaired Loans by Class of Loan (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Substandard loan	$ 4,400	$ 7,300
Mortgage loans held for sale	23,717	23,933
1-4 Family Residential (Includes Home Equity) [Member]
Financing Receivable, Recorded Investment [Line Items]
Mortgage loans held for sale	$ 23,700	$ 23,900

Note 5 - Loans and Allowance 49

Note 5 - Loans and Allowance for Credit Losses (Details) - Activity in Allowance for Loan Losses - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Three Months Ended
Allowance for credit losses, beginning balance	$ 81,384	$ 80,762
Provision for credit losses	14,000	1,250
Charge-offs	(14,265)	(1,749)
Recoveries	2,595	700
Net charge-offs	(11,670)	(1,049)
Allowance for credit losses, ending balance	83,714	80,963
Allowance for credit losses related to:
Allowance for credit losses, individually evaluated for impairment			$ 7,621	$ 7,535	$ 3,480
Allowance for credit losses, collectively evaluated for impairment			74,925	73,013	76,071
Allowance for credit losses, PCI loans			1,168	836	1,412
Total allowance for credit losses	83,714	80,762	83,714	81,384	80,963
Recorded investment in loans:
Loans, cndividually evaluated for impairment			35,922	33,398	20,931
Loans, collectively evaluated for impairment			9,555,233	9,341,432	9,085,126
PCI loans			39,536	39,826	49,326
Total loans evaluated for impairment			9,630,691	9,414,656	9,155,383
Construction, Land Development and Other Land Loans [Member]
Three Months Ended
Allowance for credit losses, beginning balance	14,882	15,825
Provision for credit losses	(703)	1,178
Charge-offs	(7)	(151)
Recoveries	193	6
Net charge-offs	186	(145)
Allowance for credit losses, ending balance	14,365	16,858
Allowance for credit losses related to:
Allowance for credit losses, individually evaluated for impairment			2	2	221
Allowance for credit losses, collectively evaluated for impairment			14,363	14,880	16,637
Total allowance for credit losses	14,882	15,825	14,365	14,882	16,858
Recorded investment in loans:
Loans, cndividually evaluated for impairment			25	40	521
Loans, collectively evaluated for impairment			1,170,405	1,072,238	1,039,052
PCI loans			3,094	920	1,272
Total loans evaluated for impairment			1,173,524	1,073,198	1,040,845
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Three Months Ended
Allowance for credit losses, beginning balance	3,845	3,722
Provision for credit losses	6,689	(523)
Charge-offs	(7,025)
Recoveries	63	78
Net charge-offs	(6,962)	78
Allowance for credit losses, ending balance	3,572	3,277
Allowance for credit losses related to:
Allowance for credit losses, individually evaluated for impairment			37	52	21
Allowance for credit losses, collectively evaluated for impairment			3,535	3,793	3,256
Total allowance for credit losses	3,845	3,722	3,572	3,845	3,277
Recorded investment in loans:
Loans, cndividually evaluated for impairment			5,691	209	232
Loans, collectively evaluated for impairment			635,208	648,214	556,103
PCI loans			394	395	504
Total loans evaluated for impairment			641,293	648,818	556,839
1-4 Family Residential (Includes Home Equity) [Member]
Three Months Ended
Allowance for credit losses, beginning balance	14,891	16,377
Provision for credit losses	(297)	487
Charge-offs	(49)	(98)
Recoveries	19	12
Net charge-offs	(30)	(86)
Allowance for credit losses, ending balance	14,564	16,778
Allowance for credit losses related to:
Allowance for credit losses, individually evaluated for impairment			91	93	242
Allowance for credit losses, collectively evaluated for impairment			14,473	14,798	16,536
Total allowance for credit losses	14,891	16,377	14,564	14,891	16,778
Recorded investment in loans:
Loans, cndividually evaluated for impairment			2,379	1,585	2,603
Loans, collectively evaluated for impairment			2,630,719	2,609,878	2,523,613
PCI loans			6,374	5,269	5,844
Total loans evaluated for impairment			2,639,472	2,616,732	2,532,060
Commercial Real Estate (Includes Multi-Family Residential) [Member]
Three Months Ended
Allowance for credit losses, beginning balance	12,996	12,744
Provision for credit losses	(546)	(173)
Charge-offs	(59)	(43)
Recoveries	0	10
Net charge-offs	(59)	(33)
Allowance for credit losses, ending balance	12,391	12,538
Allowance for credit losses related to:
Allowance for credit losses, individually evaluated for impairment			0	262	507
Allowance for credit losses, collectively evaluated for impairment			12,391	12,734	12,031
Total allowance for credit losses	12,996	12,744	12,391	12,996	12,538
Recorded investment in loans:
Loans, cndividually evaluated for impairment			9,159	15,377	6,190
Loans, collectively evaluated for impairment			3,200,625	3,098,076	2,992,782
PCI loans			19,922	17,630	22,684
Total loans evaluated for impairment			3,229,706	3,131,083	3,021,656
Commercial and Industrial [Member]
Three Months Ended
Allowance for credit losses, beginning balance	33,409	30,002
Provision for credit losses	8,150	586
Charge-offs	(6,277)	(728)
Recoveries	1,881	224
Net charge-offs	(4,396)	(504)
Allowance for credit losses, ending balance	37,163	30,084
Allowance for credit losses related to:
Allowance for credit losses, individually evaluated for impairment			7,464	7,082	2,396
Allowance for credit losses, collectively evaluated for impairment			28,531	25,491	26,276
Allowance for credit losses, PCI loans			1,168	836	1,412
Total allowance for credit losses	33,409	30,002	37,163	33,409	30,084
Recorded investment in loans:
Loans, cndividually evaluated for impairment			18,441	15,948	11,019
Loans, collectively evaluated for impairment			1,671,822	1,660,686	1,693,080
PCI loans			9,752	15,612	19,022
Total loans evaluated for impairment			1,700,015	1,692,246	1,723,121
Consumer and Other [Member]
Three Months Ended
Allowance for credit losses, beginning balance	1,361	2,092
Provision for credit losses	707	(305)
Charge-offs	(848)	(729)
Recoveries	439	370
Net charge-offs	(409)	(359)
Allowance for credit losses, ending balance	1,659	1,428
Allowance for credit losses related to:
Allowance for credit losses, individually evaluated for impairment			27	44	93
Allowance for credit losses, collectively evaluated for impairment			1,632	1,317	1,335
Total allowance for credit losses	$ 1,361	$ 2,092	1,659	1,361	1,428
Recorded investment in loans:
Loans, cndividually evaluated for impairment			227	239	366
Loans, collectively evaluated for impairment			246,454	252,340	280,496
Total loans evaluated for impairment			$ 246,681	$ 252,579	$ 280,862

Note 5 - Loans and Allowance 50

Note 5 - Loans and Allowance for Credit Losses (Details) - Troubled Debt Restructurings $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015USD ($)
Troubled Debt Restructurings
Troubled debt restructurings, number of loans	0	1
Troubled debt restructurings, pre-modification outstanding recorded investment		$ 10
Troubled debt restructurings, post-modification outstanding recorded investment		$ 10
Consumer and Other [Member]
Troubled Debt Restructurings
Troubled debt restructurings, number of loans		1
Troubled debt restructurings, pre-modification outstanding recorded investment		$ 10
Troubled debt restructurings, post-modification outstanding recorded investment		$ 10

Note 6 - Fair Value (Details)

Note 6 - Fair Value (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)
Fair Value Disclosures [Abstract]
Other Real Estate, Additions	$ 13
Additions to Impaired Loans	$ 16.5

Note 6 - Fair Value (Details) -

Note 6 - Fair Value (Details) - Fair Value Assets and Liabilities Measured on Recurring Basis - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Available for sale securities:
Available for sale securities	$ 96,349	$ 103,064
Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Available for sale securities	96,349	103,064
US States and Political Subdivisions Debt Securities [Member]
Available for sale securities:
Available for sale securities	3,738	5,485
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Available for sale securities	3,738	5,485
Collateralized Mortgage Obligations [Member]
Available for sale securities:
Available for sale securities	24,596	25,916
Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Available for sale securities	24,596	25,916
Mortgage-backed Securities [Member]
Available for sale securities:
Available for sale securities	55,220	58,971
Mortgage-backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Available for sale securities	55,220	58,971
Other Securities [Member]
Available for sale securities:
Available for sale securities	12,795	12,692
Other Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Available for sale securities	12,795	12,692
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Available for sale securities	12,795	12,692
Fair Value, Inputs, Level 1 [Member] | Other Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Available for sale securities	12,795	12,692
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Available for sale securities	83,554	90,372
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Available for sale securities	3,738	5,485
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Available for sale securities	24,596	25,916
Fair Value, Inputs, Level 2 [Member] | Mortgage-backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Available for sale securities	$ 55,220	$ 58,971

Note 6 - Fair Value (Details)53

Note 6 - Fair Value (Details) - Financial Instruments Fair Value - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets
Cash and due from banks	$ 334,592	$ 562,544
Federal funds sold	1,386	1,418
Held to maturity securities	9,352,355	9,399,363
Loans held for sale	23,717	23,933
Other real estate owned	16,695	2,963
Deposits:
Noninterest-bearing	5,112,943	5,136,579
Interest-bearing	12,759,823	12,544,540
Other borrowings	186,225	491,399
Securities sold under repurchase agreements	304,204	315,253
Junior subordinated debentures	7,217
Fair Value, Inputs, Level 1 [Member]
Assets
Cash and due from banks	334,592	562,544
Federal funds sold	1,386	1,418
Fair Value, Inputs, Level 2 [Member]
Assets
Held to maturity securities	9,457,901	9,393,175
Loans held for sale	23,717	23,933
Other real estate owned	16,695	2,963
Deposits:
Noninterest-bearing	5,112,943	5,136,579
Interest-bearing	12,764,492	12,548,050
Other borrowings	186,893	492,061
Securities sold under repurchase agreements	304,207	315,241
Junior subordinated debentures	7,221
Fair Value, Inputs, Level 3 [Member]
Assets
Loans held for investment, net of allowance	9,599,599	9,365,758
Reported Value Measurement [Member]
Assets
Cash and due from banks	334,592	562,544
Federal funds sold	1,386	1,418
Held to maturity securities	9,352,355	9,399,363
Loans held for sale	23,717	23,933
Loans held for investment, net of allowance	9,546,977	9,333,272
Other real estate owned	16,695	2,963
Deposits:
Noninterest-bearing	5,112,943	5,136,579
Interest-bearing	12,759,823	12,544,540
Other borrowings	186,225	491,399
Securities sold under repurchase agreements	304,204	315,253
Junior subordinated debentures	7,217
Estimated Fair Value [Member]
Assets
Cash and due from banks	334,592	562,544
Federal funds sold	1,386	1,418
Held to maturity securities	9,457,901	9,393,175
Loans held for sale	23,717	23,933
Loans held for investment, net of allowance	9,599,599	9,365,758
Other real estate owned	16,695	2,963
Deposits:
Noninterest-bearing	5,112,943	5,136,579
Interest-bearing	12,764,492	12,548,050
Other borrowings	186,893	492,061
Securities sold under repurchase agreements	304,207	$ 315,241
Junior subordinated debentures	$ 7,221

Note 7 - Goodwill and Core De54

Note 7 - Goodwill and Core Deposit Intangibles (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Note 7 - Goodwill and Core Deposit Intangibles (Details) [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss	$ 0
Amortization of Intangible Assets	2,222,000	$ 2,489,000
Core Deposits [Member]
Note 7 - Goodwill and Core Deposit Intangibles (Details) [Line Items]
Amortization of Intangible Assets	$ 2,222,000		$ 9,530,000
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 De55

Note 7 - Goodwill and Core Deposit Intangibles (Details) - Goodwill and Core Deposit Intangibles - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Note 7 - Goodwill and Core Deposit Intangibles (Details) - Goodwill and Core Deposit Intangibles [Line Items]
Balance	$ 1,868,827	$ 1,874,191	$ 1,874,191
Balance	49,417
Less:
Amortization	(2,222)	(2,489)
Add:
Measurement period adjustments			(5,364)
Less:
Balance	1,903,451		1,868,827
Balance	47,195		49,417
Tradition Bancshares Inc [Member]
Less:
Acquisition of Tradition Bancshares, Inc.	34,624
Balance	34,600
Core Deposits [Member]
Note 7 - Goodwill and Core Deposit Intangibles (Details) - Goodwill and Core Deposit Intangibles [Line Items]
Balance	49,417	$ 58,947	58,947
Less:
Amortization	(2,222)		(9,530)
Less:
Balance	$ 47,195		$ 49,417

Note 7 - Goodwill and Core De56

Note 7 - Goodwill and Core Deposit Intangibles (Details) - Estimated Aggregate Future Amortization Expense for Intangible Assets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Estimated Aggregate Future Amortization Expense for Intangible Assets [Abstract]
Remaining 2,016	$ 6,297
2,017	6,327
2,018	5,400
2,019	4,546
2,020	4,026
Thereafter	20,599
Total	$ 47,195	$ 49,417

Note 8 - Stock-based Compensa57

Note 8 - Stock-based Compensation (Details)	3 Months Ended
	Mar. 31, 2016USD ($)shares	Mar. 31, 2015USD ($)	Dec. 31, 2012shares	Dec. 31, 2004shares
Note 8 - Stock-based Compensation (Details) [Line Items]
Number of Stock Based Employee Compensation Plans	2
Number of Stock Based Employee Compensation Plans Expired	1
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options | $	$ 0	$ 0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $	$ 19,100,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 204 days
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				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			1,250,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	307,001

Note 9 - Contractual Obligati58

Note 9 - Contractual Obligations and Off-balance Sheet Items (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Feb. 29, 2016
Note 9 - Contractual Obligations and Off-balance Sheet Items (Details) [Line Items]
Contractual Obligation, Due in Next Fiscal Year	$ 194,496
Junior Subordinated Debt [Member]
Note 9 - Contractual Obligations and Off-balance Sheet Items (Details) [Line Items]
Contractual Obligation, Due in Next Fiscal Year	7,254	$ 7,200
To be Paid Over Future Periods [Member]
Note 9 - Contractual Obligations and Off-balance Sheet Items (Details) [Line Items]
Interest Expense, Federal Home Loan Bank and Federal Reserve Bank Advances, Long-term	$ 948

Note 9 - Contractual Obligati59

Note 9 - Contractual Obligations and Off-balance Sheet Items (Details) - Contractual Obligations and Other Commitments - USD ($) $ in Thousands	Mar. 31, 2016	Feb. 29, 2016
Note 9 - Contractual Obligations and Off-balance Sheet Items (Details) - Contractual Obligations and Other Commitments [Line Items]
1 year or less	$ 194,496
More than 1 year but less than 3 years	13,736
3 years or more but less than 5 years	6,552
5 years or more	7,895
Total	222,679
Junior Subordinated Debt [Member]
Note 9 - Contractual Obligations and Off-balance Sheet Items (Details) - Contractual Obligations and Other Commitments [Line Items]
1 year or less	7,254	$ 7,200
More than 1 year but less than 3 years	0
3 years or more but less than 5 years	0
5 years or more	0
Total	7,254
Federal Home Loan Bank Notes Payable [Member]
Note 9 - Contractual Obligations and Off-balance Sheet Items (Details) - Contractual Obligations and Other Commitments [Line Items]
1 year or less	180,932
More than 1 year but less than 3 years	5,078
3 years or more but less than 5 years	902
5 years or more	261
Total	187,173
Operating Leases [Member]
Note 9 - Contractual Obligations and Off-balance Sheet Items (Details) - Contractual Obligations and Other Commitments [Line Items]
1 year or less	6,310
More than 1 year but less than 3 years	8,658
3 years or more but less than 5 years	5,650
5 years or more	7,634
Total	$ 28,252

Note 9 - Contractual Obligati60

Note 9 - Contractual Obligations and Off-balance Sheet Items (Details) - Letters of Credit and Commitments $ in Thousands	Mar. 31, 2016USD ($)
Line of Credit Facility [Line Items]
1 year or less	$ 194,496
More than 1 year but less than 3 years	13,736
3 years or more but less than 5 years	6,552
5 years or more	7,895
Total	222,679
Guarantee Obligations [Member]
Line of Credit Facility [Line Items]
1 year or less	1,177,801
More than 1 year but less than 3 years	382,071
3 years or more but less than 5 years	70,939
5 years or more	550,136
Total	2,180,947
Standby Letters of Credit [Member] | Guarantee Obligations [Member]
Line of Credit Facility [Line Items]
1 year or less	79,912
More than 1 year but less than 3 years	5,145
3 years or more but less than 5 years	1,109
5 years or more	0
Total	86,166
Financial Guarantee [Member] | Guarantee Obligations [Member]
Line of Credit Facility [Line Items]
1 year or less	1,097,889
More than 1 year but less than 3 years	376,926
3 years or more but less than 5 years	69,830
5 years or more	550,136
Total	$ 2,094,781

Note 10 - Other Comprehensive61

Note 10 - Other Comprehensive Income (Loss) (Details) - Tax Effects Allocated to Each Component of Other Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Securities available for sale:
Change in unrealized gain during period	$ 148	$ (442)
Change in unrealized gain during period	(52)	155
Change in unrealized gain during period	96	(287)
Total securities available for sale	148	(442)
Total securities available for sale	(52)	155
Total securities available for sale	96	(287)
Total other comprehensive income (loss)	148	(442)
Total other comprehensive income (loss)	(52)	155
Total other comprehensive income (loss)	$ 96	$ (287)

Note 10 - Other Comprehensive62

Note 10 - Other Comprehensive Income (Loss) (Details) - Activity in Accumulated Other Comprehensive Income, Net of Tax - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginnning balance, accumulated other comprehensive income	$ 2,040	$ 3,729
Other comprehensive loss	96	(287)
Ending balance, accumulated other comprehensive income	2,136	3,442
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginnning balance, accumulated other comprehensive income	2,040	3,729
Other comprehensive loss	96	(287)
Ending balance, accumulated other comprehensive income	$ 2,136	$ 3,442

Note 11 - Acquisitions (Details

Note 11 - Acquisitions (Details) $ / shares in Units, $ in Thousands	Jan. 01, 2016USD ($)$ / sharesshares	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Note 11 - Acquisitions (Details) [Line Items]
Goodwill		$ 1,903,451	$ 1,868,827	$ 1,874,191
Tradition Bancshares Inc [Member]
Note 11 - Acquisitions (Details) [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares	679,528
Payments to Acquire Businesses, Gross	$ 39,000
Business Combination, Consideration Transferred	$ 71,500
Business Acquisition, Share Price | $ / shares	$ 47.86
Goodwill		$ 34,600
Tradition Bancshares Inc [Member] | Houston [Member]
Note 11 - Acquisitions (Details) [Line Items]
Number of Operating Banking Offices	7
Tradition Bancshares Inc [Member] | Katy [Member]
Note 11 - Acquisitions (Details) [Line Items]
Number of Operating Banking Offices	3
Tradition Bancshares Inc [Member] | The Woodlands [Member]
Note 11 - Acquisitions (Details) [Line Items]
Number of Operating Banking Offices	1

Note 12 - Subsequent Events (De

Note 12 - Subsequent Events (Details) $ in Thousands	Mar. 31, 2016USD ($)
Note 12 - Subsequent Events (Details) [Line Items]
Junior Subordinated Notes	$ 7,217
Tradition Bancshares Inc [Member]
Note 12 - Subsequent Events (Details) [Line Items]
Junior Subordinated Notes	$ 7,200