Simmons First National (SFNC) 10-Q 8 May 18 2018 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 25, 2018
Document Information [Line Items]
Entity Registrant Name	SIMMONS FIRST NATIONAL CORP
Entity Central Index Key	90,498
Trading Symbol	sfnc
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Entity Common Stock, Shares Outstanding (in shares)		92,243,103
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Amendment Flag	false

Consolidated Balance Sheets (Cu

Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Cash and non-interest bearing balances due from banks	$ 170,811	$ 205,025
Interest bearing balances due from banks and federal funds sold	688,853	393,017
Cash and cash equivalents	859,664	598,042
Interest bearing balances due from banks - time	3,069	3,314
Investment securities:
Held-to-maturity	352,756	368,058
Available-for-sale	1,830,113	1,589,517
Total investments	2,182,869	1,957,575
Mortgage loans held for sale	17,708	24,038
Other assets held for sale	24,784	165,780
Loans:
Legacy loans	6,290,383	5,705,609
Allowance for loan losses	(47,207)	(41,668)
Loans acquired, net of discount and allowance	4,696,945	5,074,076
Net loans	10,940,121	10,738,017
Premises and equipment	289,355	287,249
Foreclosed assets and other real estate owned	29,140	32,118
Interest receivable	42,129	43,528
Bank owned life insurance	186,473	185,984
Goodwill	845,687	842,651
Other intangible assets	99,504	106,071
Other assets	76,806	71,439
Total assets	15,597,309	15,055,806
Deposits:
Non-interest bearing transaction accounts	2,734,287	2,665,249
Interest bearing transaction accounts and savings deposits	6,720,754	6,494,896
Time deposits	2,201,874	1,932,730
Total deposits	11,656,915	11,092,875
Federal funds purchased and securities sold under agreements to repurchase	120,909	122,444
Other borrowings	1,140,986	1,380,024
Subordinated notes and debentures	468,465	140,565
Other liabilities held for sale	2,781	157,366
Accrued interest and other liabilities	98,202	77,968
Total liabilities	13,488,258	12,971,242
Stockholders’ equity:
Common stock, Class A, $0.01 par value; 120,000,000 shares authorized (1); 92,242,389 and 92,029,118 shares issued and outstanding at March 31, 2018 and December 31, 2017, respectively	922	920
Surplus	1,590,086	1,586,034
Undivided profits	552,105	514,874
Accumulated other comprehensive loss	(34,062)	(17,264)
Total stockholders’ equity	2,109,051	2,084,564
Total liabilities and stockholders’ equity	$ 15,597,309	$ 15,055,806

Consolidated Balance Sheets (C3

Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Common stock, Class A, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, Class A, shares authorized (in shares)	120,000,000	120,000,000
Common stock, Class A, shares issued (in shares)	92,242,389	92,029,118
Common stock, Class A, shares outstanding (in shares)	92,242,389	92,029,118

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($)		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
INTEREST INCOME
Loans		$ 143,350,000	$ 68,728,000
Interest bearing balances due from banks and federal funds sold		1,009,000	122,000
Investment securities		12,622,000	9,451,000
Mortgage loans held for sale		158,000	126,000
TOTAL INTEREST INCOME		157,139,000	78,427,000
INTEREST EXPENSE
Deposits		15,597,000	4,204,000
Federal funds purchased and securities sold under agreements to repurchase		110,000	75,000
Other borrowings		5,139,000	1,194,000
Subordinated notes and debentures		1,327,000	574,000
TOTAL INTEREST EXPENSE		22,173,000	6,047,000
NET INTEREST INCOME		134,966,000	72,380,000
Provision for loan losses		9,150,000	4,307,000
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES		125,816,000	68,073,000
NON-INTEREST INCOME
Investment banking income		834,000	690,000
Bank owned life insurance income		1,103,000	818,000
Gain on sale of securities, net		6,000	63,000
Other income		4,007,000	3,621,000
TOTAL NON-INTEREST INCOME		37,535,000	30,060,000
NON-INTEREST EXPENSE
Salaries and employee benefits		56,357,000	35,536,000
Occupancy expense, net		6,960,000	4,663,000
Furniture and equipment expense		4,403,000	4,443,000
Other real estate and foreclosure expense		1,020,000	589,000
Deposit insurance		2,128,000	680,000
Merger related costs		1,711,000	524,000
Other operating expenses		25,494,000	19,887,000
TOTAL NON-INTEREST EXPENSE		98,073,000	66,322,000
INCOME BEFORE INCOME TAXES		65,278,000	31,811,000
Provision for income taxes		13,966,000	9,691,000
NET INCOME		$ 51,312,000	$ 22,120,000
BASIC EARNINGS PER SHARE (in dollars per share)	[1]	$ 0.56	$ 0.35
DILUTED EARNINGS PER SHARE (in dollars per share)	[1]	$ 0.55	$ 0.35
Fiduciary and Trust [Member]
NON-INTEREST INCOME
Non-interest income		$ 5,249,000	$ 4,212,000
Deposit Account [Member]
NON-INTEREST INCOME
Non-interest income		10,345,000	8,102,000
Financial Service, Other [Member]
NON-INTEREST INCOME
Non-interest income		2,750,000	2,197,000
Mortgage Banking and SBA Loans [Member]
NON-INTEREST INCOME
Non-interest income		4,445,000	2,423,000
Credit and Debit Card [Member]
NON-INTEREST INCOME
Non-interest income		$ 8,796,000	$ 7,934,000
[1]	All per share amounts have been restated to reflect the effect of the two-for-one stock split on February 8, 2018.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
NET INCOME	$ 51,312	$ 22,120
OTHER COMPREHENSIVE (LOSS) INCOME
Unrealized holding (losses) gains arising during the period on available-for-sale securities	(22,735)	1,567
Less: Reclassification adjustment for realized gains included in net income	6	63
Other comprehensive (loss) gain, before tax effect	(22,741)	1,504
Less: Tax effect of other comprehensive (loss) income	(5,943)	590
TOTAL OTHER COMPREHENSIVE (LOSS) INCOME	(16,798)	914
COMPREHENSIVE INCOME	$ 34,514	$ 23,034

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
OPERATING ACTIVITIES
Net income	$ 51,312,000	$ 22,120,000
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	6,677,000	4,953,000
Provision for loan losses	9,150,000	4,307,000
Gain on sale of investments	(6,000)	(63,000)
Net accretion of investment securities and assets	(14,368,000)	(6,766,000)
Net (accretion) amortization on borrowings	(211,000)	106,000
Stock-based compensation expense	2,585,000	2,329,000
Loss on sale of premises and equipment, net of impairment		43,000
Loss (gain) on sale of foreclosed assets held for sale	41,000	(326,000)
Gain on sale of mortgage loans held for sale	(2,610,000)	(2,360,000)
Deferred income taxes	3,921,000	3,090,000
Increase in cash surrender value of bank owned life insurance	(1,103,000)	(818,000)
Originations of mortgage loans held for sale	(113,012,000)	(88,870,000)
Proceeds from sale of mortgage loans held for sale	121,952,000	109,264,000
Changes in assets and liabilities:
Interest receivable	1,582,000	1,699,000
Assets held in trading accounts		(14,000)
Other assets	(5,648,000)	3,901,000
Accrued interest and other liabilities	33,983,000	(16,913,000)
Income taxes payable	(13,955,000)	6,123,000
Net cash provided by operating activities	80,290,000	41,805,000
INVESTING ACTIVITIES
Net originations of loans	(140,804,000)	(144,651,000)
Decrease in due from banks - time	245,000
Purchases of premises and equipment, net	(6,052,000)	(25,924,000)
Proceeds from sale of premises and equipment		1,394,000
Proceeds from sale of foreclosed assets held for sale	4,359,000	2,844,000
Proceeds from sale of available-for-sale securities	7,726,000
Proceeds from maturities of available-for-sale securities	58,548,000	26,373,000
Purchases of available-for-sale securities	(320,798,000)	(123,787,000)
Proceeds from maturities of held-to-maturity securities	15,512,000	32,051,000
Purchases of held-to-maturity securities		(860,000)
Proceeds from bank owned life insurance death benefits	616,000
Disposition of assets and liabilities held for sale	(75,586,000)
Net cash used in investing activities	(456,234,000)	(232,560,000)
FINANCING ACTIVITIES
Net change in deposits	564,040,000	53,069,000
Proceeds from issuance of subordinated notes	326,711,000
Dividends paid on common stock	(14,081,000)	(7,845,000)
Net change in other borrowed funds	(239,038,000)	167,915,000
Net change in federal funds purchased and securities sold under agreements to repurchase	(1,535,000)	(5,022,000)
Net shares issued under stock compensation plans	1,469,000	2,260,000
Net cash provided by financing activities	637,566,000	210,377,000
INCREASE IN CASH AND CASH EQUIVALENTS	261,622,000	19,622,000
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	598,042,000	285,659,000
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 859,664,000	$ 305,281,000

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Hardeman County Investment Company, Inc. [Member]Common Stock [Member]	Hardeman County Investment Company, Inc. [Member]Additional Paid-in Capital [Member]	Hardeman County Investment Company, Inc. [Member]AOCI Attributable to Parent [Member]	Hardeman County Investment Company, Inc. [Member]	OKSB Merger [Member]Common Stock [Member]	OKSB Merger [Member]Additional Paid-in Capital [Member]	OKSB Merger [Member]AOCI Attributable to Parent [Member]	OKSB Merger [Member]	First Texas Merger [Member]Common Stock [Member]	First Texas Merger [Member]Additional Paid-in Capital [Member]	First Texas Merger [Member]AOCI Attributable to Parent [Member]	First Texas Merger [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2016													$ 626	$ 711,663	$ (15,212)	$ 454,034	$ 1,151,111
Comprehensive income															914	22,120	23,034
Stock issued for employee stock purchase plan														618			618
Stock-based compensation plans, net													2	3,969			3,971
Dividends on common stock																(7,845)	(7,845)
Balance at Mar. 31, 2017													628	716,250	(14,298)	468,309	1,170,889
Comprehensive income															50	70,820	70,870
Stock-based compensation plans, net													1	8,969			8,970
Reclassify stranded tax effects due to 2017 tax law changes															(3,016)	3,016
Stock issued for acquisition	$ 16	$ 42,622		$ 42,638	$ 145	$ 431,253		$ 431,398	$ 130	$ 386,940		$ 387,070
Cash dividends																(27,271)	(27,271)
Balance at Dec. 31, 2017													920	1,586,034	(17,264)	514,874	2,084,564
Comprehensive income															(16,798)	51,312	34,514
Stock issued for employee stock purchase plan														1,026			1,026
Stock-based compensation plans, net													2	3,026			3,028
Dividends on common stock																(14,081)	(14,081)
Balance at Mar. 31, 2018													$ 922	$ 1,590,086	$ (34,062)	$ 552,105	$ 2,109,051

Consolidated Statements of Sto8

Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares		3 Months Ended		9 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Hardeman County Investment Company, Inc. [Member]
Stock issued for acquisition (in shares)	[1]			1,599,940
OKSB Merger [Member]
Stock issued for acquisition (in shares)	[1]			14,488,604
First Texas Merger [Member]
Stock issued for acquisition (in shares)	[1]			12,999,840
Stock issued for employee stock purchase plan, shares (in shares)	[1]	39,782	26,002
Stock issued for compensation plans, shares (in shares)	[1]	173,489	195,266	164,020
Cash dividends per share (in dollars per share)	[1]	$ 0.15	$ 0.125	$ 0.375
[1]	All share and per share amounts have been restated to reflect the effect of the two-for-one stock split on February 8, 2018.

Note 1 - Preparation of Interim

Note 1 - Preparation of Interim Financial Statements	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	NOTE 1: Organizational Structure Simmons First National Corporation (the “Company”) is a publicly traded financial holding company that trades on the NASDAQ Global Select Market (“NASDAQ”) under the ticker symbol “SFNC” and the parent of Simmons Bank, an Arkansas state-chartered bank that began as a community bank in 1903, October 2017 Description of Business The Company is headquartered in Pine Bluff, Arkansas and conducts banking operations in communities throughout Arkansas, Colorado, Kansas, Missouri, Oklahoma, Tennessee and Texas. The Company offers consumer, real estate and commercial loans, checking, savings and time deposits from 200 Basis of Presentation The accompanying unaudited consolidated financial statements have been prepared based upon Securities and Exchange Commission (“SEC”) rules that permit reduced disclosures for interim periods. Certain information and footnote disclosures have been condensed or omitted in accordance with those rules and regulations. The accompanying consolidated balance sheet as of December 31, 2017, not 10 December 31, 2017, February 28, 2018. The preparation of financial statements, in accordance with accounting principles generally accepted in the United States (“US GAAP”), requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, income items and expenses and disclosure of contingent assets and liabilities. The estimates and assumptions used in the accompanying consolidated financial statements are based upon management’s evaluation of the relevant facts and circumstances as of the date of the consolidated financial statements and actual results may not Certain prior year amounts have been reclassified to conform to the current year financial statement presentation. These changes and reclassifications did not Recently Adopted Accounting Standards Reporting Comprehensive Income February 2018, No. 2018 02, Income Statement-Reporting Comprehensive Income (Topic 220 2018 02” December 2017 ( “2017 2018 02 1 2 December 15, 2018, 2018 02 fourth 2017, $3.0 Stock Compensation: Scope of Modification Accounting May 2017, No. 2017 09, Compensation – Stock Compensation (Topic 718 2017 09” 1 2 718, may 2017 09 December 15, 2017, not 2017 09 not Premium Amortization on Purchased Callable Debt Securities March 2017, No. 2017 08, Receivables – Nonrefundable Fees and Other Costs (Topic 310 20 2017 08” not December 15, 2018, 2017 08 first 2017. not Statement of Cash Flows August 2016, No. 2016 15, Statement of Cash Flows (Topic 230 2016 15” December 15, 2017, may 2016 15 not not Financial Assets and Financial Liabilities January 2016, No. 2016 01, Financial Instruments – Overall (Subtopic 825 10 2016 01” February 2018, 2018 03 December 15, 2017, 2016 01 not 2016 01 not Revenue Recognition May 2014, No. 2014 09, Revenue from Contracts with Customers (Topic 606 2014 09” July 2015, No. 2015 14, December 15, 2017. not not Recently Issued Accounting Standards Derivatives and Hedging: Targeted Improvements August 2017, No. 2017 12, Derivatives and Hedging (Topic 815 2017 12” 1 2 3 4 5 December 15, 2018, not Goodwill Impairment January 2017, No. 2017 04, Intangibles – Goodwill and Other (Topic 350 2017 04” 2 not December 15, 2019, 2017. 2017 04 not Credit Losses on Financial Instruments June 2016, No. 2016 13, Financial Instruments – Credit Losses (Topic 326 2016 13” 2016 13 December 15, 2019, one first one Leases February 2016, No. 2016 02, Leases (Topic 842 2016 02” December 15, 2018, March 31, 2018, not There have been no 2017 10 not Revenue from Contracts with Customers Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers 606 not two not 606. not 606 Certain revenue streams, such as service charges on deposit accounts, gains or losses on the sale of OREO, and trust income, fall under the scope of Topic 606 606 five 1 2 3 4 5 The Company has evaluated the nature of all contracts with customers that fall under the scope of Topic 606 not not not A description of performance obligations for each type of contract with customers is as follows: Service charges on deposit accounts not Sale of OREO Trust Income Acquisition Accounting, Loans Acquired The Company accounts for its acquisitions under ASC Topic 805, Business Combinations No 820, Fair Value Measurement The Company evaluates non-impaired loans acquired in accordance with the provisions of ASC Topic 310 20, Nonrefundable Fees and Other Costs 310 30, Loans and Debt Securities Acquired with Deteriorated Credit Quality not For impaired loans accounted for under ASC Topic 310 30, For further discussion of acquisition and loan accounting, see Note 2, 6,

Note 2 - Acquisitions

Note 2 - Acquisitions	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Mergers, Acquisitions and Dispositions Disclosures [Text Block]	NOTE 2: Southwest Bancorp, Inc. On October 19, 2017, 14,488,604 $431.4 October 19, 2017, $94.9 Prior to the acquisition, OKSB conducted banking business from 29 $2.7 $2.0 $2.0 May 2018, Goodwill of $229.1 not A summary, at fair value, of the assets acquired and liabilities assumed in the OKSB transaction, as of the acquisition date, is as follows: (In thousands) Acquired from Fair Value Fair Assets Acquired Cash and due from banks $ 79,517 $ -- $ 79,517 Investment securities 485,468 (1,295 ) 484,173 Loans acquired 2,039,524 (43,071 ) 1,996,453 Allowance for loan losses (26,957 ) 26,957 -- Foreclosed assets 6,284 (1,127 ) 5,157 Premises and equipment 21,210 5,457 26,667 Bank owned life insurance 28,704 -- 28,704 Goodwill 13,545 (13,545 ) -- Core deposit intangible 1,933 40,191 42,124 Other intangibles 3,806 -- 3,806 Other assets 33,455 (9,141 ) 24,314 Total assets acquired $ 2,686,489 $ 4,426 $ 2,690,915 Liabilities Assumed Deposits: Non-interest bearing transaction accounts $ 485,971 $ -- $ 485,971 Interest bearing transaction accounts and savings deposits 869,252 -- 869,252 Time deposits 613,345 (2,213 ) 611,132 Total deposits 1,968,568 (2,213 ) 1,966,355 Securities sold under agreement to repurchase 11,256 -- 11,256 Other borrowings 347,000 -- 347,000 Subordinated debentures 46,393 -- 46,393 Accrued interest and other liabilities 17,440 5,364 22,804 Total liabilities assumed 2,390,657 3,151 2,393,808 Equity 295,832 (295,832 ) -- Total equity assumed 295,832 (295,832 ) -- Total liabilities and equity assumed $ 2,686,489 $ (292,681 ) $ 2,393,808 Net assets acquired 297,107 Purchase price 526,251 Goodwill $ 229,144 The purchase price allocation and certain fair value measurements remain preliminary due to the timing of the acquisition. Management will continue to review the estimated fair values and evaluate the assumed tax positions. The Company expects to finalize its analysis of the acquired assets and assumed liabilities in this transaction over the next few months, within one may The Company’s operating results for all periods presented include the operating results of the acquired assets and assumed liabilities of OKSB subsequent to the acquisition date. First Texas BHC, Inc. On October 19, 2017, 12,999,840 $387.1 October 19, 2017, $70.0 Prior to the acquisition, First Texas operated 15 $2.4 $2.2 $1.9 February 2018. Goodwill of $240.8 not A summary, at fair value, of the assets acquired and liabilities assumed in the First Texas transaction, as of the acquisition date, is as follows: (In thousands) Acquired from Fair Value Fair Assets Acquired Cash and due from banks $ 59,277 $ -- $ 59,277 Investment securities 81,114 (596 ) 80,518 Loans acquired 2,246,212 (37,834 ) 2,208,378 Allowance for loan losses (20,864 ) 20,664 (200 ) Premises and equipment 24,864 10,123 34,987 Bank owned life insurance 7,190 -- 7,190 Goodwill 37,227 (37,227 ) -- Core deposit intangible -- 7,328 7,328 Other assets 18,263 11,485 29,748 Total assets acquired $ 2,453,283 $ (26,057 ) $ 2,427,226 Liabilities Assumed Deposits: Non-interest bearing transaction accounts $ 74,410 $ -- $ 74,410 Interest bearing transaction accounts and savings deposits 1,683,298 -- 1,683,298 Time deposits 124,233 (283 ) 123,950 Total deposits 1,881,941 (283 ) 1,881,658 Securities sold under agreement to repurchase 50,000 -- 50,000 Other borrowings 235,000 -- 235,000 Subordinated debentures 30,323 589 30,912 Accrued interest and other liabilities 11,727 1,669 13,396 Total liabilities assumed 2,208,991 1,975 2,210,966 Equity 244,292 (244,292 ) -- Total equity assumed 244,292 (244,292 ) -- Total liabilities and equity assumed $ 2,453,283 $ (242,317 ) $ 2,210,966 Net assets acquired 216,260 Purchase price 457,103 Goodwill $ 240,843 The purchase price allocation and certain fair value measurements remain preliminary due to the timing of the acquisition. Management will continue to review the estimated fair values and evaluate the assumed tax positions. The Company expects to finalize its analysis of the acquired assets and assumed liabilities in this transaction over the next few months, within one may The Company’s operating results for all periods presented include the operating results of the acquired assets and assumed liabilities of First Texas subsequent to the acquisition date. Summary of Unaudited Pro forma Information The unaudited pro forma information below for the years ended December 31, 2017 2016 January 1, 2016. December 31, 2017 $9.4 2017. not (In thousands, except per share data) 2017 2016 Revenue (1) $ 654,358 $ 620,461 Net income $ 130,947 $ 136,199 Diluted earnings per share $ 1.43 $ 1.52 _________________________________________ ( 1 Consolidated year-to-date 2017 $29.2 $10.5 $27.6 $5.7 Hardeman County Investment Company, Inc. On May 15, 2017, 1,599,940 $42.6 May 15, 2017, $30.0 Prior to the acquisition, Hardeman conducted banking business from 10 $462.9 $251.6 $389.0 September 2017. five Goodwill of $29.4 two not A summary, at fair value, of the assets acquired and liabilities assumed in the Hardeman transaction, as of the acquisition date, is as follows: (In thousands) Acquired from Fair Value Fair Assets Acquired Cash and due from banks $ 8,001 $ -- $ 8,001 Interest bearing balances due from banks - time 1,984 -- 1,984 Investment securities 170,654 (285 ) 170,369 Loans acquired 257,641 (5,992 ) 251,649 Allowance for loan losses (2,382 ) 2,382 -- Foreclosed assets 1,083 (452 ) 631 Premises and equipment 9,905 1,258 11,163 Bank owned life insurance 7,819 -- 7,819 Goodwill 11,485 (11,485 ) -- Core deposit intangible -- 7,840 7,840 Other intangibles -- 830 830 Other assets 2,639 (1 ) 2,638 Total assets acquired $ 468,829 $ (5,905 ) $ 462,924 Liabilities Assumed Deposits: Non-interest bearing transaction accounts $ 76,555 $ -- $ 76,555 Interest bearing transaction accounts and savings deposits 214,872 -- 214,872 Time deposits 97,917 (368 ) 97,549 Total deposits 389,344 (368 ) 388,976 Securities sold under agreement to repurchase 17,163 -- 17,163 Other borrowings 3,000 -- 3,000 Subordinated debentures 6,702 -- 6,702 Accrued interest and other liabilities 1,891 1,924 3,815 Total liabilities assumed 418,100 1,556 419,656 Equity 50,729 (50,729 ) -- Total equity assumed 50,729 (50,729 ) -- Total liabilities and equity assumed $ 468,829 $ (49,173 ) $ 419,656 Net assets acquired 43,268 Purchase price 72,639 Goodwill $ 29,371 During 2018, The Company’s operating results for all periods presented include the operating results of the acquired assets and assumed liabilities of Hardeman subsequent to the acquisition date. The following is a description of the methods used to determine the fair values of significant assets and liabilities presented in the acquisitions above. Cash and due from banks and time deposits due from banks Investment securities Loans acquired not not Foreclosed assets Premises and equipment Bank owned life insurance Goodwill Core deposit intangible Other intangibles Other assets Deposits Securities sold under agreement to repurchase FHLB and other borrowings Subordinated debentures Accrued interest and other liabilities

Note 3 - Investment Securities

Note 3 - Investment Securities	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	NOTE 3: The amortized cost and fair value of investment securities that are classified as held-to-maturity (“HTM”) and available-for-sale (“AFS”) are as follows: March 31, 2018 December 31, 2017 (In thousands) Amortized Gross Gross Unrealized Estimated Amortized Gross Gross Unrealized Estimated Held-to-Maturity U.S. Government agencies $ 46,961 $ 1 $ (259 ) $ 46,703 $ 46,945 $ 7 $ (228 ) $ 46,724 Mortgage-backed securities 15,404 -- (444 ) 14,960 16,132 8 (287 ) 15,853 State and political subdivisions 286,901 3,701 (1,106 ) 289,496 301,491 5,962 (222 ) 307,231 Other securities 3,490 -- -- 3,490 3,490 -- -- 3,490 Total HTM $ 352,756 $ 3,702 $ (1,809 ) $ 354,649 $ 368,058 $ 5,977 $ (737 ) $ 373,298 Available-for-Sale U.S. Government agencies $ 152,855 $ 15 $ (3,066 ) $ 149,804 $ 141,559 $ 116 $ (1,951 ) $ 139,724 Mortgage-backed securities 1,394,138 155 (38,114 ) 1,356,179 1,208,017 246 (20,946 ) 1,187,317 State and political subdivisions 191,018 100 (5,230 ) 185,888 144,642 532 (2,009 ) 143,165 Other securities 136,911 1,332 (1 ) 138,242 118,106 1,206 (1 ) 119,311 Total AFS $ 1,874,922 $ 1,602 $ (46,411 ) $ 1,830,113 $ 1,612,324 $ 2,100 $ (24,907 ) $ 1,589,517 Securities with limited marketability, such as stock in the Federal Reserve Bank and the Federal Home Loan Bank, are carried at cost and are reported as other AFS securities in the table above. Certain investment securities are valued at less than their historical cost. Total fair value of these investments at March 31, 2018 December 31, 2017, $1.8 $1.4 82.1% 73.5%, The following table shows the gross unrealized losses and fair value of the Company’s investments with unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at March 31, 2018: Less Than 12 Months 12 Months or More Total (In thousands) Estimated Gross Estimated Gross Estimated Gross Held-to-Maturity U.S. Government agencies $ 12,957 $ (17 ) $ 32,758 $ (242 ) $ 45,715 $ (259 ) Mortgage-backed securities 5,897 (110 ) 8,479 (334 ) 14,376 (444 ) State and political subdivisions 100,221 (1,070 ) 1,595 (36 ) 101,816 (1,106 ) Total HTM $ 119,075 $ (1,197 ) $ 42,832 $ (612 ) $ 161,907 $ (1,809 ) Available-for-Sale U.S. Government agencies $ 120,100 $ (1,617 ) $ 25,326 $ (1,449 ) $ 145,426 $ (3,066 ) Mortgage-backed securities 725,518 (12,950 ) 589,543 (25,164 ) 1,315,061 (38,114 ) State and political subdivisions 95,659 (1,603 ) 73,293 (3,627 ) 168,952 (5,230 ) Other securities -- -- 99 (1 ) 99 (1 ) Total AFS $ 941,277 $ (16,170 ) $ 688,261 $ (30,241 ) $ 1,629,538 $ (46,411 ) These declines primarily resulted from the rate for these investments yielding less than current market rates. Based on evaluation of available evidence, management believes the declines in fair value for these securities are temporary. Management does not not not Declines in the fair value of HTM and AFS securities below their cost that are deemed to be other than temporary are reflected in earnings as realized losses. In estimating other-than-temporary impairment losses, management considers, among other things, (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer, and (iii) the intent and ability of the Company to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value. Management has the ability and intent to hold the securities classified as HTM until they mature, at which time the Company expects to receive full value for the securities. Furthermore, as of March 31, 2018, not March 31, 2018, Income earned on securities for the three March 31, 2018 2017, (In thousands) 2018 2017 Taxable: Held-to-maturity $ 567 $ 661 Available-for-sale 9,032 5,816 Non-taxable: Held-to-maturity 1,936 2,283 Available-for-sale 1,087 691 Total $ 12,622 $ 9,451 The amortized cost and estimated fair value by maturity of securities are shown in the following table. Securities are classified according to their contractual maturities without consideration of principal amortization, potential prepayments or call options. Accordingly, actual maturities may Held-to-Maturity Available-for-Sale (In thousands) Amortized Fair Amortized Fair One year or less $ 48,493 $ 48,335 $ 370 $ 370 After one through five years 75,993 75,842 35,843 35,100 After five through ten years 92,585 92,633 22,926 22,342 After ten years 120,281 122,879 284,834 277,981 Securities not due on a single maturity date 15,404 14,960 1,394,138 1,356,179 Other securities (no maturity) -- -- 136,811 138,141 Total $ 352,756 $ 354,649 $ 1,874,922 $ 1,830,113 The carrying value, which approximates the fair value, of securities pledged as collateral, to secure public deposits and for other purposes, amounted to $1.4 March 31, 2018 $1.2 December 31, 2017. There were approximately $6,000 no three March 31, 2018. $63,000 no three March 31, 2017. The state and political subdivision debt obligations are predominately non-rated bonds representing small issuances, primarily in Arkansas, Missouri, Oklahoma, Tennessee and Texas issues, which are evaluated on an ongoing basis.

Note 4 - Other Assets and Other

Note 4 - Other Assets and Other Liabilities Held for Sale	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	NOTE 4: In August 2017, In March 2018, $141.0 $154.6 first 2018, $24.8 $2.8 one The following is a description of the methods used to determine the fair values of significant assets and liabilities presented in the Heartland transaction. Cash and due from banks Investment securities no Loans acquired not not Premises and equipment

Note 5 - Loans and Allowance fo

Note 5 - Loans and Allowance for Loan Losses	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	NOTE 5: At March 31, 2018, $10.99 $10.78 December 31, 2017. (In thousands) March 31, December 31, Consumer: Credit cards $ 176,602 $ 185,422 Other consumer 284,285 280,094 Total consumer 460,887 465,516 Real Estate: Construction 786,077 614,155 Single family residential 1,193,464 1,094,633 Other commercial 2,611,358 2,530,824 Total real estate 4,590,899 4,239,612 Commercial: Commercial 971,704 825,217 Agricultural 128,247 148,302 Total commercial 1,099,951 973,519 Other 138,646 26,962 Loans 6,290,383 5,705,609 Loans acquired, net of discount and allowance (1) 4,696,945 5,074,076 Total loans $ 10,987,328 $ 10,779,685 ______________________ ( 1 See Note 6, Loan Origination/Risk Management may eight Consumer Real estate one Commercial one three Nonaccrual and Past Due Loans not may may Nonaccrual loans, excluding loans acquired, segregated by class of loans, are as follows: (In thousands) March 31, December 31, Consumer: Credit cards $ 298 $ 170 Other consumer 4,711 4,605 Total consumer 5,009 4,775 Real estate: Construction 1,923 2,242 Single family residential 13,616 13,431 Other commercial 16,707 16,054 Total real estate 32,246 31,727 Commercial: Commercial 8,003 6,980 Agricultural 2,137 2,160 Total commercial 10,140 9,140 Total $ 47,395 $ 45,642 An age analysis of past due loans, excluding loans acquired, segregated by class of loans, is as follows: (In thousands) Gross 90 Days Total Current Total 90 Days March 31, 2018 Consumer: Credit cards $ 707 $ 672 $ 1,379 $ 175,223 $ 176,602 $ 233 Other consumer 3,407 3,176 6,583 277,702 284,285 33 Total consumer 4,114 3,848 7,962 452,925 460,887 266 Real estate: Construction 640 703 1,343 784,734 786,077 -- Single family residential 6,937 6,163 13,100 1,180,364 1,193,464 71 Other commercial 4,796 9,488 14,284 2,597,074 2,611,358 -- Total real estate 12,373 16,354 28,727 4,562,172 4,590,899 71 Commercial: Commercial 3,674 4,134 7,808 963,896 971,704 -- Agricultural 107 2,075 2,182 126,065 128,247 -- Total commercial 3,781 6,209 9,990 1,089,961 1,099,951 -- Other -- -- -- 138,646 138,646 -- Total $ 20,268 $ 26,411 $ 46,679 $ 6,243,704 $ 6,290,383 $ 337 December 31, 2017 Consumer: Credit cards $ 707 $ 672 $ 1,379 $ 184,043 $ 185,422 $ 332 Other consumer 5,009 3,298 8,307 271,787 280,094 10 Total consumer 5,716 3,970 9,686 455,830 465,516 342 Real estate: Construction 411 1,210 1,621 612,534 614,155 -- Single family residential 8,071 6,460 14,531 1,080,102 1,094,633 1 Other commercial 2,388 8,031 10,419 2,520,405 2,530,824 -- Total real estate 10,870 15,701 26,571 4,213,041 4,239,612 1 Commercial: Commercial 1,523 6,125 7,648 817,569 825,217 -- Agricultural 50 2,120 2,170 146,132 148,302 -- Total commercial 1,573 8,245 9,818 963,701 973,519 -- Other -- -- -- 26,962 26,962 -- Total $ 18,159 $ 27,916 $ 46,075 $ 5,659,534 $ 5,705,609 $ 343 Impaired Loans not 90 Impairment is evaluated in total for smaller-balance loans of a similar nature and on an individual loan basis for other loans. Impaired loans, or portions thereof, are charged-off when deemed uncollectible. Impaired loans, net of government guarantees and excluding loans acquired, segregated by class of loans, are as follows: (In thousands) Unpaid Recorded Investment Recorded Total Related Average Interest March 31, 2018 Three Months Ended Consumer: Credit cards $ 298 $ 298 $ -- $ 298 $ -- $ 234 $ 15 Other consumer 4,849 4,711 -- 4,711 -- 4,658 34 Total consumer 5,147 5,009 -- 5,009 -- 4,892 49 Real estate: Construction 2,392 1,220 702 1,922 249 2,082 16 Single family residential 14,605 13,057 559 13,616 32 13,523 100 Other commercial 22,500 8,135 8,573 16,708 145 16,287 120 Total real estate 39,497 22,412 9,834 32,246 426 31,892 236 Commercial: Commercial 8,480 7,119 758 7,877 18 7,226 53 Agricultural 3,256 2,137 -- 2,137 -- 1,586 12 Total commercial 11,736 9,256 758 10,014 18 8,812 65 Total $ 56,380 $ 36,677 $ 10,592 $ 47,269 $ 444 $ 45,596 $ 350 December 31, 2017 Three Months Ended Consumer: Credit cards $ 170 $ 170 $ -- $ 170 $ -- $ 302 $ 5 Other consumer 4,755 4,605 -- 4,605 -- 2,107 13 Total consumer 4,925 4,775 -- 4,775 -- 2,409 18 Real estate: Construction 2,522 1,347 895 2,242 249 3,074 20 Single family residential 14,347 12,725 706 13,431 53 12,667 81 Other commercial 22,308 6,732 9,133 15,865 36 19,321 123 Total real estate 39,177 20,804 10,734 31,538 338 35,062 224 Commercial: Commercial 9,954 4,306 2,269 6,575 -- 11,344 72 Agricultural 3,278 1,035 -- 1,035 -- 1,726 11 Total commercial 13,232 5,341 2,269 7,610 -- 13,070 83 Total $ 57,334 $ 30,920 $ 13,003 $ 43,923 $ 338 $ 50,541 $ 325 At March 31, 2018, December 31, 2017, $47.3 $43.9 $444,000 $338,000 March 31, 2018 December 31, 2017, $350,000 $45.6 three March 31, 2018. three March 31, 2018 2017 not Included in certain impaired loan categories are troubled debt restructurings (“TDRs”). When the Company restructures a loan to a borrower that is experiencing financial difficulty and grants a concession that it would not Under ASC Topic 310 10 35 Subsequent Measurement Once an obligation has been restructured because of such credit problems, it continues to be considered a TDR until paid in full; or, if an obligation yields a market interest rate and no not 1 2 six The following table presents a summary of troubled debt restructurings, excluding loans acquired, segregated by class of loans. Accruing TDR Loans Nonaccrual TDR Loans Total TDR Loans (Dollars in thousands) Number Balance Number Balance Number Balance March 31, 2018 Consumer: Other consumer 1 $ 91 -- $ -- 1 $ 91 Total consumer 1 91 -- -- 1 91 Real estate: Construction -- -- 1 408 1 408 Single-family residential 5 201 13 802 18 1,003 Other commercial 4 4,270 4 3,350 8 7,620 Total real estate 9 4,471 18 4,560 27 9,031 Commercial: Commercial 4 1,897 6 738 10 2,635 Total commercial 4 1,897 6 738 10 2,635 Total 14 $ 6,459 24 $ 5,298 38 $ 11,757 December 31, 2017 Real estate: Construction -- $ -- 1 $ 420 1 $ 420 Single-family residential 4 141 15 954 19 1,095 Other commercial 4 4,322 5 3,712 9 8,034 Total real estate 8 4,463 21 5,086 29 9,549 Commercial: Commercial 5 2,644 6 745 11 3,389 Total commercial 5 2,644 6 745 11 3,389 Total 13 $ 7,107 27 $ 5,831 40 $ 12,938 The following table presents loans that were restructured as TDRs during the three March 31, 2018 2017, Modification Type (Dollars in thousands) Number of Balance Prior Balance at Change in Change in Financial Impact Three Months Ended March 31, 2018 Consumer: Other consumer 1 $ 91 $ 91 $ 91 $ -- $ -- Total consumer 1 91 91 91 -- -- Real estate: Single-family residential 1 61 62 62 -- -- Total real estate 1 61 62 62 -- -- Total 2 $ 152 $ 153 $ 153 $ -- $ -- Three Months Ended March 31, 2017 Real estate: Construction 1 $ 456 $ 456 $ 456 $ -- $ -- Other commercial 2 7,362 7,362 7,362 -- 33 Total real estate 3 7,818 7,818 7,818 -- 33 Commercial: Commercial 5 770 760 760 -- -- Total commercial 5 770 760 760 -- -- Total 8 $ 8,588 $ 8,578 $ 8,578 $ -- $ 33 During the three March 31, 2018, 2 $152,000 12 not no not During the three March 31, 2017, 8 $8.6 12 $26,000 $33,000 There was one three March 31, 2018. $66,300 $294,300 one three March 31, 2017. 90 In addition to the TDRs that occurred during the period provided in the preceding tables, the Company had TDRs with pre-modification loan balances of $294,300 $242,300 March 31, 2018 2017, March 31, 2018 December 31, 2017, $6,809,000 $5,057,000, March 31, 2018 December 31, 2017, $3,767,000 $3,828,000, Credit Quality Indicators The Company utilizes a risk rating matrix to assign a risk rate to each of its commercial and real estate loans. Loans are rated on a scale of 1 8. 8 · Risk Rate 1 · Risk Rate 2 · Risk Rate 3 · Risk Rate 4 may may first may one may one · Risk Rate 5 may not not may may · Risk Rate 6 not not may · Risk Rate 7 may · Risk Rate 8 not not no not may Loans acquired are evaluated using this internal grading system. Loans acquired are evaluated individually and include purchased credit impaired loans of $17.6 $17.1 310 30 6 March 31, 2018 December 31, 2017, 310 20, $78.7 $76.3 6, 7 8 March 31, 2018 December 31, 2017, Purchased credit impaired loans are loans that showed evidence of deterioration of credit quality since origination and for which it is probable, at acquisition, that the Company will be unable to collect all amounts contractually owed. Their fair value was initially based on the estimate of cash flows, both principal and interest, expected to be collected or estimated collateral values if cash flows are not not Classified loans for the Company include loans in Risk Ratings 6, 7 8. may not one 1 6 8 not not 2 not not 310 30, $177.8 $175.6 March 31, 2018 December 31, 2017, The following table presents a summary of loans by credit risk rating as of March 31, 2018 December 31, 2017, 310 30 1 4 (In thousands) Risk Rate Risk Rate Risk Rate Risk Rate Risk Rate Total March 31, 2018 Consumer: Credit cards $ 176,071 $ -- $ 531 $ -- $ -- $ 176,602 Other consumer 279,414 -- 4,871 -- -- 284,285 Total consumer 455,485 -- 5,402 -- -- 460,887 Real estate: Construction 778,757 2,344 4,960 16 -- 786,077 Single family residential 1,168,255 1,790 23,197 222 -- 1,193,464 Other commercial 2,572,032 7,076 32,250 -- -- 2,611,358 Total real estate 4,519,044 11,210 60,407 238 -- 4,590,899 Commercial: Commercial 953,138 6,140 12,426 -- -- 971,704 Agricultural 124,938 325 2,961 23 -- 128,247 Total commercial 1,078,076 6,465 15,387 23 -- 1,099,951 Other 138,646 -- -- -- -- 138,646 Loans acquired 4,545,941 54,664 95,842 498 -- 4,696,945 Total $ 10,737,192 $ 72,339 $ 177,038 $ 759 $ -- $ 10,987,328 (In thousands) Risk Rate Risk Rate Risk Rate Risk Rate Risk Rate Total December 31, 2017 Consumer: Credit cards $ 184,920 $ -- $ 502 $ -- $ -- $ 185,422 Other consumer 275,160 -- 4,934 -- -- 280,094 Total consumer 460,080 -- 5,436 -- -- 465,516 Real estate: Construction 603,126 5,795 5,218 16 -- 614,155 Single family residential 1,066,902 3,954 23,490 287 -- 1,094,633 Other commercial 2,480,293 19,581 30,950 -- -- 2,530,824 Total real estate 4,150,321 29,330 59,658 303 -- 4,239,612 Commercial: Commercial 736,377 74,254 14,402 50 134 825,217 Agricultural 146,065 24 2,190 23 -- 148,302 Total commercial 882,442 74,278 16,592 73 134 973,519 Other 26,962 -- -- -- -- 26,962 Loans acquired 4,782,384 198,314 93,378 -- -- 5,074,076 Total $ 10,302,189 $ 301,922 $ 175,064 $ 376 $ 134 $ 10,779,685 Allowance for Loan Losses Allowance for Loan Losses 310 10, Receivables 450 20, Loss Contingencies As mentioned above, allocations to the allowance for loan losses are categorized as either specific allocations or general allocations. A loan is considered impaired when it is probable that the Company will not not The general allocation is calculated monthly based on management’s assessment of several factors such as ( 1 2 3 4 5 6 7 8 one four The following table details activity in the allowance for loan losses by portfolio segment for the three March 31, 2018. one not (In thousands) Commercial Real Credit Other Total Three Months Ended March 31, 2018 Balance, beginning of period $ 7,007 $ 27,281 $ 3,784 $ 3,596 $ 41,668 Provision for loan losses (1) 4,286 3,286 751 759 9,082 Charge-offs (1,761 ) (455 ) (999 ) (1,056 ) (4,271 ) Recoveries 69 302 263 94 728 Net charge-offs (1,692 ) (153 ) (736 ) (962 ) (3,543 ) Balance, March 31, 2018 (2) $ 9,601 $ 30,414 $ 3,799 $ 3,393 $ 47,207 Period-end amount allocated to: Loans individually evaluated for impairment $ 18 $ 426 $ -- $ -- $ 444 Loans collectively evaluated for impairment 9,583 29,988 3,799 3,393 46,763 Balance, March 31, 2018 (2) $ 9,601 $ 30,414 $ 3,799 $ 3,393 $ 47,207 Activity in the allowance for loan losses for the three March 31, 2017 (In thousands) Commercial Real Credit Other Total Three Months Ended March 31, 2017 Balance, beginning of period $ 7,739 $ 21,817 $ 3,779 $ 2,951 $ 36,286 Provision for loan losses (1) 696 860 758 1,243 3,557 Charge-offs (292 ) (656 ) (1,044 ) (1,174 ) (3,166 ) Recoveries 30 232 236 690 1,188 Net charge-offs (262 ) (424 ) (808 ) (484 ) (1,978 ) Balance, March 31, 2017 (2) $ 8,173 $ 22,253 $ 3,729 $ 3,710 $ 37,865 Period-end amount allocated to: Loans individually evaluated for impairment $ 708 $ 837 $ -- $ 1 $ 1,546 Loans collectively evaluated for impairment 7,465 21,416 3,729 3,709 36,319 Balance, March 31, 2017 (2) $ 8,173 $ 22,253 $ 3,729 $ 3,710 $ 37,865 Period-end amount allocated to: Loans individually evaluated for impairment $ -- $ 338 $ -- $ -- $ 338 Loans collectively evaluated for impairment 7,007 26,943 3,784 3,596 41,330 Balance, December 31, 2017 (2) $ 7,007 $ 27,281 $ 3,784 $ 3,596 $ 41,668 ( 1 Provision for loan losses of $68,000 three March 31, 2018 ( three March 31, 2018 $9,150,000 $79,000 three March 31, 2018, $407,000. $750,000 three March 31, 2017 ( three March 31, 2017 $4,307,000 $1.3 first three 2017, $435,000. ( 2 Allowance for loan losses at March 31, 2018 $407,000 not December 31, 2017 March 31, 2017 $418,000 $435,000, not March 31, 2018 $47,614,000 December 31, 2017 March 31, 2017 $42,086,000 $38,300,000, The Company’s recorded investment in loans, excluding loans acquired, related to each balance in the allowance for loan losses by portfolio segment on the basis of the Company’s impairment methodology was as follows: (In thousands) Commercial Real Credit Other Total March 31, 2018 Loans individually evaluated for impairment $ 10,014 $ 32,246 $ 298 $ 4,711 $ 47,269 Loans collectively evaluated for impairment 1,089,937 4,558,653 176,304 418,220 6,243,114 Balance, end of period $ 1,099,951 $ 4,590,899 $ 176,602 $ 422,931 $ 6,290,383 December 31, 2017 Loans individually evaluated for impairment $ 7,610 $ 31,538 $ 170 $ 4,605 $ 43,923 Loans collectively evaluated for impairment 965,909 4,208,074 185,252 302,451 5,661,686 Balance, end of period $ 973,519 $ 4,239,612 $ 185,422 $ 307,056 $ 5,705,609

Note 6 - Loans Acquired

Note 6 - Loans Acquired	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Loans Acquired [Text Block]	NOTE 6: During the fourth 2017, $1.985 $2.021 $36.3 2, 310 20, Nonrefundable Fees and Other Costs not $11.4 $18.1 $6.7 310 30, Loans and Debt Securities Acquired with Deteriorated Credit Quality not Also during the fourth 2017, $2.208 $2.246 $37.8 2, 310 20, Nonrefundable Fees and Other Costs not During the second 2017, $249.2 $254.2 $5.0 2, 310 20, Nonrefundable Fees and Other Costs not $2.4 $3.4 $990,000 310 30, Loans and Debt Securities Acquired with Deteriorated Credit Quality See Note 2, The following table reflects the carrying value of all loans acquired as of March 31, 2018 December 31, 2017: Loans Acquired (In thousands) March 31, December 31, Consumer: Other consumer $ 43,090 $ 51,467 Real estate: Construction 591,533 637,032 Single family residential 747,597 793,228 Other commercial 2,420,121 2,387,777 Total real estate 3,759,251 3,818,037 Commercial: Commercial 891,261 995,587 Agricultural 3,343 66,576 Total commercial 894,604 1,062,163 Other -- 142,409 Total loans acquired (1) $ 4,696,945 $ 5,074,076 _____________________________________________________________________________________ ( 1 Loans acquired are reported net of a $407,000 $418,000 March 31, 2018 December 31, 2017, Nonaccrual loans acquired, excluding purchased credit impaired loans accounted for under ASC Topic 310 30, 5, (In thousands) March 31, December 31, Consumer: Other consumer $ 570 $ 334 Real estate: Construction 241 1,767 Single family residential 8,072 12,151 Other commercial 19,626 7,401 Total real estate 27,939 21,319 Commercial: Commercial 1,518 1,748 Agricultural 152 84 Total commercial 1,670 1,832 Total $ 30,179 $ 23,485 An age analysis of past due loans acquired segregated by class of loans, is as follows (see Note 5, (In thousands) Gross 90 Days Total Current Total 90 Days March 31, 2018 Consumer: Other consumer $ 444 $ 152 $ 596 $ 42,494 $ 43,090 $ -- Real estate: Construction 162 1,504 1,666 589,867 591,533 -- Single family residential 7,938 5,353 13,291 734,306 747,597 -- Other commercial 1,480 3,940 5,420 2,414,701 2,420,121 -- Total real estate 9,580 10,797 20,377 3,738,874 3,759,251 -- Commercial: Commercial 1,697 569 2,266 888,995 891,261 -- Agricultural 43 119 162 3,181 3,343 -- Total commercial 1,740 688 2,428 892,176 894,604 -- Total $ 11,764 $ 11,637 $ 23,401 $ 4,673,544 $ 4,696,945 $ -- December 31, 2017 Consumer: Other consumer $ 889 $ 260 $ 1,149 $ 50,318 $ 51,467 $ 108 Real estate: Construction 2,577 1,448 4,025 633,007 637,032 279 Single family residential 12,936 3,302 16,238 776,990 793,228 126 Other commercial 17,176 5,647 22,823 2,364,954 2,387,777 2,565 Total real estate 32,689 10,397 43,086 3,774,951 3,818,037 2,970 Commercial: Commercial 2,344 1,039 3,383 992,204 995,587 67 Agricultural 51 -- 51 66,525 66,576 -- Total commercial 2,395 1,039 3,434 1,058,729 1,062,163 67 Other 15 -- 15 142,394 142,409 -- Total $ 35,988 $ 11,696 $ 47,684 $ 5,026,392 $ 5,074,076 $ 3,145 The following table presents a summary of loans acquired by credit risk rating, segregated by class of loans (see Note 5, 310 30 1 4 (In thousands) Risk Rate Risk Rate Risk Rate Risk Rate Risk Rate Total March 31, 2018 Consumer: Other consumer $ 41,995 $ 14 $ 1,081 $ -- $ -- $ 43,090 Real estate: Construction 570,334 19,624 1,575 -- -- 591,533 Single family residential 726,224 1,917 18,958 498 -- 747,597 Other commercial 2,374,014 12,663 33,444 -- -- 2,420,121 Total real estate 3,670,572 34,204 53,977 498 -- 3,759,251 Commercial: Commercial 830,225 20,446 40,590 -- -- 891,261 Agricultural 3,149 -- 194 -- -- 3,343 Total commercial 833,374 20,446 40,784 -- -- 894,604 Total $ 4,545,941 $ 54,664 $ 95,842 $ 498 $ -- $ 4,696,945 December 31, 2017 Consumer: Other consumer $ 50,625 $ 21 $ 821 $ -- $ -- $ 51,467 Real estate: Construction 604,796 30,524 1,712 -- -- 637,032 Single family residential 770,954 2,618 19,656 -- -- 793,228 Other commercial 2,337,097 15,064 35,616 -- -- 2,387,777 Total real estate 3,712,847 48,206 56,984 -- -- 3,818,037 Commercial: Commercial 946,322 13,901 35,364 -- -- 995,587 Agricultural 66,367 -- 209 -- -- 66,576 Total commercial 1,012,689 13,901 35,573 -- -- 1,062,163 Other 142,409 -- -- -- -- 142,409 Total $ 4,918,570 $ 62,128 $ 93,378 $ -- $ -- $ 5,074,076 Loans acquired were individually evaluated and recorded at estimated fair value, including estimated credit losses, at the time of acquisition. These loans are systematically reviewed by the Company to determine the risk of losses that may In addition to the accretable yield on loans acquired not may may not The impact of these adjustments on the Company’s financial results for the three March 31, 2018 2017 Three Months Ended (In thousands) 2018 2017 Impact on net interest income and pre-tax income $ 450 $ 1,184 Impact, net of taxes $ 331 $ 720 These adjustments will be recognized over the remaining lives of the purchased credit impaired loans. The accretable yield adjustments recorded in future periods will change as the Company continues to evaluate expected cash flows from the purchased credit impaired loans. Changes in the carrying amount of the accretable yield for all purchased impaired loans were as follows for the three March 31, 2018 2017. Three Months Ended Three Months Ended (In thousands) Accretable Carrying Accretable Carrying Beginning balance $ 620 $ 17,116 $ 1,655 $ 17,802 Additions -- -- -- -- Accretable yield adjustments 1,134 -- 1,228 -- Accretion (385 ) 385 (1,666 ) 1,666 Payments and other reductions, net -- 104 -- (10,773 ) Balance, ending $ 1,369 $ 17,605 $ 1,217 $ 8,695 Purchased impaired loans are evaluated on an individual borrower basis. Because some loans evaluated by the Company were determined to have experienced impairment in the estimated credit quality or cash flows, the Company recorded a provision and established an allowance for loan loss for loans acquired resulting in a total allowance on loans acquired of $407,000 March 31, 2018 $418,000 December 31, 2017. three March 31, 2018 2017 $68,000 $750,000,

Note 7 - Goodwill and Other Int

Note 7 - Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Goodwill and Intangible Assets Disclosure [Text Block]	NOTE 7: Goodwill is tested annually, or more often than annually, if circumstances warrant, for impairment. If the implied fair value of goodwill is lower than its carrying amount, goodwill impairment is indicated, and goodwill is written down to its implied fair value. Subsequent increases in goodwill value are not $845.7 March 31, 2018 $842.7 December 31, 2017. The Company recorded $229.1 $240.8 $29.4 three March 31, 2018 December 31, 2017. Core deposit premiums are amortized over periods ranging from 10 15 $42.1 $7.3 $7.8 2017 Intangible assets are being amortized over various periods ranging from 10 15 $830,000 2017 $3.8 2017 first 2018. The Company’s goodwill and other intangibles (carrying basis and accumulated amortization) at March 31, 2018 December 31, 2017, (In thousands) March 31, December 31, Goodwill $ 845,687 $ 842,651 Core deposit premiums: Gross carrying amount 105,984 105,984 Accumulated amortization (19,009 ) (16,659 ) Core deposit premiums, net 86,975 89,325 Books of business intangible: Gross carrying amount 15,234 15,414 Accumulated amortization (2,912 ) (2,827 ) Books of business intangible, net 12,322 12,587 Other intangibles: Gross carrying amount 2,068 6,037 Accumulated amortization (1,861 ) (1,878 ) Other intangibles, net 207 4,159 Other intangible assets, net 99,504 106,071 Total goodwill and other intangible assets $ 945,191 $ 948,722 The Company’s estimated remaining amortization expense on intangibles as of March 31, 2018 (In thousands) Year Amortization Remainder of 2018 $ 8,171 2019 10,565 2020 10,552 2021 10,490 2022 10,438 Thereafter 49,288 Total $ 99,504

Note 8 - Time Deposits

Note 8 - Time Deposits	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Deposit Liabilities Disclosures [Text Block]	NOTE 8: Time deposits include approximately $1.035 $736.0 $100,000 March 31, 2018, December 31, 2017, $664,732,000 $396,771,000 $250,000 March 31, 2018 December 31, 2017,

Note 9 - Income Taxes

Note 9 - Income Taxes	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Income Tax Disclosure [Text Block]	NOTE 9: The provision for income taxes is comprised of the following components: (In thousands) March 31, March 31, Income taxes currently payable $ 10,045 $ 6,601 Deferred income taxes 3,921 3,090 Provision for income taxes $ 13,966 $ 9,691 The tax effects of temporary differences between the tax basis of assets and liabilities and their financial reporting amounts that give rise to deferred income tax assets and liabilities, and their appropriate tax effects, are as follows: (In thousands) March 31, December 31, Deferred tax assets: Loans acquired $ 18,418 $ 19,885 Allowance for loan losses 12,294 10,773 Valuation of foreclosed assets 2,852 2,852 Tax NOLs from acquisition 7,727 7,821 Deferred compensation payable 2,534 2,433 Accrued equity and other compensation 4,472 5,302 Acquired securities 578 578 Unrealized loss on available-for-sale securities 12,217 6,107 Other 7,279 8,813 Gross deferred tax assets 68,371 64,564 Deferred tax liabilities: Goodwill and other intangible amortization (32,579 ) (32,572 ) Accumulated depreciation (9,317 ) (8,945 ) Other (4,103 ) (4,413 ) Gross deferred tax liabilities (45,999 ) (45,930 ) Net deferred tax asset, included in other assets $ 22,372 $ 18,634 A reconciliation of income tax expense at the statutory rate to the Company's actual income tax expense is shown below: (In thousands) March 31, March 31, Computed at the statutory rate (1) $ 13,708 $ 11,134 Increase (decrease) in taxes resulting from: State income taxes, net of federal tax benefit 1,822 539 Discrete items related to ASU 2016-09 (273 ) (1,082 ) Tax exempt interest income (677 ) (1,071 ) Tax exempt earnings on BOLI (186 ) (218 ) Other differences, net (428 ) 389 Actual tax provision $ 13,966 $ 9,691 ________________________ ( 1 The statutory rate was 21% three March 31, 2018, 35% three March 31, 2017. The Company follows ASC Topic 740, Income Taxes not not fifty not first no not first no 740 no 2018 On December 22, 2017, “2017 2017 35% 21% December 31, 2017. December 22, 2017 21% 2017 On December 22, 2017, No. 118 118” 2017 118 not one 2017 740, Income Taxes 2017 2017 740 2017 740 not 2017 not not December 31, 2017. 2017 2017 may The amount of unrecognized tax benefits may Section 382 382 $35.6 382 2028 2035. The Company files income tax returns in the U.S. federal jurisdiction. The Company’s U.S. federal income tax returns are open and subject to examinations from the 2014 2014

Note 10 - Securities Sold Under

Note 10 - Securities Sold Under Agreements to Repurchase	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block]	NOTE 10: The Company utilizes securities sold under agreements to repurchase to facilitate the needs of its customers and to facilitate secured short-term funding needs. Securities sold under agreements to repurchase are stated at the amount of cash received in connection with the transaction. The Company monitors collateral levels on a continuous basis. The Company may The gross amount of recognized liabilities for repurchase agreements was $114.6 $122.0 March 31, 2018 December 31, 2017, March 31, 2018 December 31, 2017 Remaining Contractual Maturity of the Agreements (In thousands) Overnight and Up to 30 Days 30-90 Days Greater than Total March 31, 2018 Repurchase agreements: U.S. Government agencies $ 114,634 $ -- $ -- $ -- $ 114,634 December 31, 2017 Repurchase agreements: U.S. Government agencies $ 122,019 $ -- $ -- $ -- $ 122,019

Note 11 - Other Borrowings and

Note 11 - Other Borrowings and Subordinated Notes and Debentures	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Debt Disclosure [Text Block]	NOTE 11: Debt at March 31, 2018 December 31, 2017 (In thousands) March 31, December 31, Other Borrowings FHLB advances, net of discount, due 2018 to 2033, 1.33% to 7.37% secured by residential real estate loans $ 1,140,986 $ 1,261,642 Revolving credit agreement, due 10/5/2018, floating rate of 1.50% above the one month LIBOR rate, unsecured -- 75,000 Notes payable, due 10/15/2020, 3.85%, fixed rate, unsecured -- 43,382 Total other borrowings 1,140,986 1,380,024 Subordinated Notes and Debentures Subordinated notes payable, due 4/1/2028, fixed-to-floating rate (fixed rate of 5.00% through 3/31/2023, floating rate of 2.15% above the three month LIBOR rate, reset quarterly) 330,000 -- Trust preferred securities, due 12/30/2033, floating rate of 2.80% above the three month LIBOR rate, reset quarterly, callable without penalty 20,620 20,620 Trust preferred securities, net of discount, due 6/30/2035, floating rate of 1.75% above the three month LIBOR rate, reset quarterly, callable without penalty 9,344 9,327 Trust preferred securities, net of discount, due 9/15/2037, floating rate of 1.37% above the three month LIBOR rate, reset quarterly 10,310 10,284 Trust preferred securities, net of discount, due 12/5/2033, floating rate of 2.88% above the three month LIBOR rate, reset quarterly, callable without penalty 5,155 5,156 Trust preferred securities, net of discount, due 10/18/2034, floating rate of 2.00% above the three month LIBOR rate, reset quarterly, callable without penalty 5,155 5,148 Trust preferred securities, net of discount, due 6/6/2037, floating rate of 1.57% above the three month LIBOR rate, reset quarterly, callable without penalty 10,310 10,288 Trust preferred securities, due 12/15/2035, floating rate of 1.45% above the three month LIBOR rate, reset quarterly, callable without penalty 6,702 6,702 Trust preferred securities, due 6/26/2033, floating rate of 3.10% above the three month LIBOR rate, reset quarterly, callable without penalty 20,619 20,619 Trust preferred securities, due 10/7/2033, floating rate of 2.85% above the three month LIBOR rate, reset quarterly, callable without penalty 25,774 25,774 Trust preferred securities, due 9/15/2037, floating rate of 2.00% above the three month LIBOR rate, reset quarterly, callable without penalty 8,248 8,248 Other subordinated debentures, net of discount, due 9/30/2023, floating rate equal to daily average of prime rate, reset quarterly 19,517 18,399 Unamortized debt issuance costs (3,289 ) -- Total subordinated notes and debentures 468,465 140,565 Total other borrowings and subordinated debt $ 1,609,451 $ 1,520,589 In March 2018, $330.0 5.00% 100% $3.3 March. April 1, 2028 5.00% April 1, 2023 three 215 not not first 2018, 2 In October 2017, may $75.0 October 5, 2018, At March 31, 2018, $653.0 one The Company had total FHLB advances of $1.1 March 31, 2018, $2.2 $3.7 March 31, 2018. The trust preferred securities are tax-advantaged issues that qualified for Tier 1 December 31, 2017, $15 2 March 31, 2018. The Company’s long-term debt includes subordinated debt, notes payable and FHLB advances with an original maturity of greater than one March 31, 2018, (In thousands) Year Annual 2018 $ 102,899 2019 2,577 2020 2,474 2021 2,165 2022 1,314 Thereafter 845,022 Total $ 956,451

Note 12 - Contingent Liabilitie

Note 12 - Contingent Liabilities	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	NOTE 12: The Company and/or its subsidiaries have various unrelated legal proceedings, which, in the aggregate, are not

Note 13 - Common Stock

Note 13 - Common Stock	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Capital Stock Disclosure [Text Block]	NOTE 13: On January 18, 2018, two one 100% January 30, 2018 ( February 9, 2018. February 8, 2018 two one On April 19, 2018, 120,000,000 175,000,000. On July 23, 2012, 1,700,000 2% 308,272 no may not

Note 14 - Undivided Profits

Note 14 - Undivided Profits	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Restrictions on Dividends, Loans and Advances [Text Block]	NOTE 14: The Company’s subsidiary banks are subject to legal limitations on dividends that can be paid to the parent company without prior approval of the applicable regulatory agencies. For the lead subsidiary bank, Simmons Bank, the approval of the Commissioner of the Arkansas State Bank Department is required if the total of all dividends declared by an Arkansas state bank in any calendar year exceeds seventy-five 75% seventy-five 75% may two March 31, 2018, $1.6 The risk-based capital guidelines of the Federal Reserve Board and the Arkansas State Bank Department include the definitions for ( 1 2 3 January 1, 2015, 5% 8% 1 10% 6.50% 1 CET1 The Company and Banks must hold a capital conservation buffer composed of CET1 January 1, 2016, 0.625% four January 1 2.5% January 1, 2019). March 31, 2018, CET1 9.64% March 31, 2018.

Note 15 - Stock Based Compensat

Note 15 - Stock Based Compensation	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	NOTE 15: The Company’s Board of Directors has adopted various stock-based compensation plans. The plans provide for the grant of incentive stock options, nonqualified stock options, stock appreciation rights, restricted stock awards, restricted stock units, and performance stock units. Pursuant to the plans, shares are reserved for future issuance by the Company upon exercise of stock options or awarding of bonus shares granted to directors, officers and other key employees. Share and per share information regarding Stock-Based Compensation Plans has been adjusted to reflect the effects of the Company’s two one February 8, 2018. three March 31, 2018: Stock Options Non-vested Non-vested Number Weighted Number Weighted Number Weighted Balance, January 1, 2018 812 $ 21.98 162 $ 20.86 652 $ 27.92 Granted -- -- -- -- 280 29.16 Stock Options Exercised (83 ) 20.67 -- -- -- -- Stock Awards/Units Vested -- -- (40 ) 17.89 (144 ) 27.87 Forfeited/Expired (3 ) 23.51 (9 ) 19.67 (46 ) 28.22 Balance, March 31, 2018 726 $ 22.12 113 $ 22.01 742 $ 28.38 Exercisable, March 31, 2018 693 $ 22.06 The following table summarizes information about stock options under the plans outstanding at March 31, 2018: Options Outstanding Options Exercisable Range of Exercise Prices Number of Shares (000) Weighted Average Remaining Contractual Life (Years) Weighted Average Exercise Price Number of Shares (000) Weighted Average Exercise Price $8.78 - $9.46 3 1.97 $ 9.22 3 $ 9.22 10.65 - 10.65 5 3.90 10.65 5 10.65 10.76 - 10.76 2 1.80 10.76 2 10.76 15.16 - 15.16 25 0.16 15.16 25 15.16 20.29 - 20.29 70 6.75 20.29 70 20.29 20.36 - 20.36 3 6.63 20.36 2 20.36 22.20 - 22.20 76 6.98 22.20 76 22.20 22.75 - 22.75 436 7.36 22.75 436 22.75 23.51 - 23.51 99 7.66 23.51 67 23.51 24.07 - 24.07 7 7.46 24.07 7 24.07 $8.78 $24.07 726 6.99 $ 22.12 693 $ 22.06 Stock-based compensation expense was $2,621,000 $2,599,000 three March 31, 2018 2017, $169,000 March 31, 2018. $24,932,000 March 31, 2018. 2.4 The intrinsic value of stock options outstanding and stock options exercisable at March 31, 2018 $4,600,000 $4,430,000. $28.45 March 31, 2018, three March 31, 2018 March 31, 2017, $646,000 $414,000, The fair value of the Company’s employee stock options granted is estimated on the date of grant using the Black-Scholes option-pricing model. This model requires the input of highly subjective assumptions, changes to which can materially affect the fair value estimate. There were no three March 31, 2018 2017.

Note 16 - Earnings Per Share ("

Note 16 - Earnings Per Share ("EPS")	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Earnings Per Share [Text Block]	NOTE 16: Basic EPS is computed based on the weighted average number of shares outstanding during each period. Diluted EPS is computed using the weighted average common shares and all potential dilutive common shares outstanding during the period. The share and per share amounts for 2017 two one February 2018. Following is the computation of earnings per share for the three March 31, 2018 2017: (In thousands, except per share data) 2018 2017 Net income $ 51,312 $ 22,120 Average common shares outstanding 92,182 62,702 Average potential dilutive common shares 457 524 Average diluted common shares 92,639 63,226 Basic earnings per share $ 0.56 $ 0.35 Diluted earnings per share $ 0.55 $ 0.35 There were no three March 31, 2018 2017.

Note 17 - Additional Cash Flow

Note 17 - Additional Cash Flow Information	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Cash Flow, Supplemental Disclosures [Text Block]	NOTE 17: The following is a summary of the Company’s additional cash flow information during the three Three Months Ended (In thousands) 2018 2017 Interest paid $ 22,863 $ 6,160 Income taxes (refunded) paid (7,375 ) 23 Transfers of loans to foreclosed assets held for sale 1,316 2,044 Transfers of premises to foreclosed assets and other real estate owned 106 --

Note 18 - Other Operating Expen

Note 18 - Other Operating Expenses	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Other Income and Other Expense Disclosure [Text Block]	NOTE 18: Other operating expenses consist of the following: Three Months Ended (In thousands) 2018 2017 Professional services $ 4,330 $ 5,169 Postage 1,399 1,131 Telephone 1,486 1,078 Credit card expense 3,228 2,837 Marketing 1,660 1,364 Operating supplies 749 355 Amortization of intangibles 2,837 1,550 Branch right sizing expense 61 118 Other expense 9,744 6,285 Total other operating expenses $ 25,494 $ 19,887

Note 19 - Certain Transactions

Note 19 - Certain Transactions	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Related Party Transactions Disclosure [Text Block]	NOTE 19: From time to time the Company and its subsidiaries have made loans and other extensions of credit to directors, officers, their associates and members of their immediate families. From time to time directors, officers and their associates and members of their immediate families have placed deposits with the Company’s subsidiary banks, Simmons Bank and Bank SNB. Such loans, other extensions of credit and deposits were made in the ordinary course of business, on substantially the same terms (including interest rates and collateral) as those prevailing at the time for comparable transactions with other persons not not

Note 20 - Commitments and Credi

Note 20 - Commitments and Credit Risk	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Commitments Disclosure [Text Block]	NOTE 20: The Company grants agri-business, commercial and residential loans to customers throughout Arkansas, Colorado, Kansas, Missouri, Oklahoma, Tennessee and Texas, along with credit card loans to customers throughout the United States. Commitments to extend credit are agreements to lend to a customer as long as there is no may may not may At March 31, 2018, $567,620,000 $3,288,010,000 December 31, 2017, $564,592,000 $3,086,696,000 Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third $39,372,000 $47,621,000 March 31, 2018, December 31, 2017, 9 15 March 31, 2018 December 31, 2017, no

Note 21 - Fair Value Measuremen

Note 21 - Fair Value Measurements	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Fair Value Disclosures [Text Block]	NOTE 21: ASC Topic 820, Fair Value Measurements ASC Topic 820 820 three may · Level 1 · Level 2 1 not · Level 3 no In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not may may may may not not may Following is a description of the inputs and valuation methodologies used for assets measured at fair value on a recurring basis and recognized in the accompanying consolidated balance sheets, as well as the general classification of such assets pursuant to the valuation hierarchy. Available-for-sale securities 1 1 2 may 820, 2 third 16 1 2 not 3 1 2 Derivative instruments 2 The following table sets forth the Company’s financial assets by level within the fair value hierarchy that were measured at fair value on a recurring basis as of March 31, 2018 December 31, 2017. Fair Value Measurements Using (In thousands) Fair Value Quoted Prices in Significant Other Significant March 31, 2018 Available-for-sale securities U.S. Government agencies $ 149,804 $ -- $ 149,804 $ -- Mortgage-backed securities 1,356,179 -- 1,356,179 -- State and political subdivisions 185,888 -- 185,888 -- Other securities 138,242 -- 138,242 -- Other assets held for sale 24,784 -- -- 24,784 Derivative asset 6,381 -- 6,381 -- Other liabilities held for sale (2,781 ) -- -- (2,781 ) Derivative liability (6,326 ) -- (6,326 ) -- December 31, 2017 Available-for-sale securities U.S. Government agencies $ 139,724 $ -- $ 139,724 $ -- Mortgage-backed securities 1,187,317 -- 1,187,317 -- States and political subdivisions 143,165 -- 143,165 -- Other securities 119,311 -- 119,311 -- Other assets held for sale 165,780 -- -- 165,780 Derivative asset 3,634 -- 3,634 -- Other liabilities held for sale (157,366 ) -- -- (157,366 ) Derivative liability (3,068 ) -- (3,068 ) -- Certain financial assets and liabilities are measured at fair value on a nonrecurring basis; that is, the instruments are not Impaired loans (collateral dependent) not 3 Appraisals are updated at renewal, if not $1.5 one two may 1 3 310 Foreclosed assets and other real estate owned 3 March 31, 2018 December 31, 2017, $29.1 $32.1 The significant unobservable inputs (Level 3 may 3 10% 40% Mortgage loans held for sale not may 2 3 3. March 31, 2018 December 31, 2017, no The following table sets forth the Company’s financial assets by level within the fair value hierarchy that were measured at fair value on a nonrecurring basis as of March 31, 2018 December 31, 2017. Fair Value Measurements Using (In thousands) Fair Value Quoted Prices in Significant Other Significant March 31, 2018 Impaired loans (1) (2) $ 12,358 $ -- $ -- $ 12,358 Foreclosed assets and other real estate owned (1) 23,983 -- -- 23,983 December 31, 2017 Impaired loans (1) (2) $ 11,229 $ -- $ -- $ 11,229 Foreclosed assets and other real estate owned (1) 24,093 -- -- 24,093 ________________________ ( 1 These amounts represent the resulting carrying amounts on the Consolidated Balance Sheets for impaired collateral dependent loans and foreclosed assets and other real estate owned for which fair value re-measurements took place during the period. ( 2 Specific allocations of $243,000 $2,195,000 March 31, 2018 December 31, 2017, ASC Topic 825, Financial Instruments not not Cash and cash equivalents 1 Interest bearing balances due from banks 2 Held-to-maturity securities 1 not may 2 1 2 not 3 Loans 3 Deposits 2 3 Federal Funds purchased, securities sold under agreement to repurchase and short-term debt 2 Other borrowings 2 Subordinated debentures 2 Accrued interest receivable/payable 2 Commitments to extend credit, letters of credit and lines of credit The fair value of a financial instrument is the current amount that would be exchanged between willing parties, other than in a forced liquidation. Fair value is best determined based upon quoted market prices. However, in many instances, there are no not may not The estimated fair values, and related carrying amounts, of the Company’s financial instruments are as follows: Carrying Fair Value Measurements (In thousands) Amount Level 1 Level 2 Level 3 Total March 31, 2018 Financial assets: Cash and cash equivalents $ 859,664 $ 859,664 $ -- $ -- $ 859,664 Interest bearing balances due from banks - time 3,069 -- 3,069 -- 3,069 Held-to-maturity securities 352,756 -- 354,649 -- 354,649 Mortgage loans held for sale 17,708 -- -- 17,708 17,708 Interest receivable 42,129 -- 42,129 -- 42,129 Legacy loans, net 6,243,176 -- -- 6,214,776 6,214,776 Loans acquired, net 4,696,945 -- -- 4,675,579 4,675,579 Financial liabilities: Non-interest bearing transaction accounts 2,734,287 -- 2,734,287 -- 2,734,287 Interest bearing transaction accounts and savings deposits 6,720,754 -- 6,720,754 -- 6,720,754 Time deposits 2,201,874 -- -- 2,179,221 2,179,221 Federal funds purchased and securities sold under agreements to repurchase 120,909 -- 120,909 -- 120,909 Other borrowings 1,140,986 -- 1,145,193 -- 1,145,193 Subordinated notes and debentures 468,465 -- 413,968 -- 413,968 Interest payable 3,874 -- 3,874 -- 3,874 December 31, 2017 Financial assets: Cash and cash equivalents $ 598,042 $ 598,042 $ -- $ -- $ 598,042 Interest bearing balances due from banks - time 3,314 -- 3,314 -- 3,314 Held-to-maturity securities 368,058 -- 373,298 -- 373,298 Mortgage loans held for sale 24,038 -- -- 24,038 24,038 Interest receivable 43,528 -- 43,528 -- 43,528 Legacy loans, net 5,663,941 -- -- 5,646,505 5,646,505 Loans acquired, net 5,074,076 -- -- 5,058,455 5,058,455 Financial liabilities: Non-interest bearing transaction accounts 2,665,249 -- 2,665,249 -- 2,665,249 Interest bearing transaction accounts and savings deposits 6,494,896 -- 6,494,896 -- 6,494,896 Time deposits 1,932,730 -- -- 1,915,539 1,915,539 Federal funds purchased and securities sold under agreements to repurchase 122,444 -- 122,444 -- 122,444 Other borrowings 1,380,024 -- 1,381,365 -- 1,381,365 Subordinated debentures 140,565 -- 136,474 -- 136,474 Interest payable 4,564 -- 4,564 -- 4,564 The fair value of commitments to extend credit, letters of credit and lines of credit is not

Significant Accounting Policies

Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Adopted Accounting Standards Reporting Comprehensive Income February 2018, No. 2018 02, Income Statement-Reporting Comprehensive Income (Topic 220 2018 02” December 2017 ( “2017 2018 02 1 2 December 15, 2018, 2018 02 fourth 2017, $3.0 Stock Compensation: Scope of Modification Accounting May 2017, No. 2017 09, Compensation – Stock Compensation (Topic 718 2017 09” 1 2 718, may 2017 09 December 15, 2017, not 2017 09 not Premium Amortization on Purchased Callable Debt Securities March 2017, No. 2017 08, Receivables – Nonrefundable Fees and Other Costs (Topic 310 20 2017 08” not December 15, 2018, 2017 08 first 2017. not Statement of Cash Flows August 2016, No. 2016 15, Statement of Cash Flows (Topic 230 2016 15” December 15, 2017, may 2016 15 not not Financial Assets and Financial Liabilities January 2016, No. 2016 01, Financial Instruments – Overall (Subtopic 825 10 2016 01” February 2018, 2018 03 December 15, 2017, 2016 01 not 2016 01 not Revenue Recognition May 2014, No. 2014 09, Revenue from Contracts with Customers (Topic 606 2014 09” July 2015, No. 2015 14, December 15, 2017. not not Recently Issued Accounting Standards Derivatives and Hedging: Targeted Improvements August 2017, No. 2017 12, Derivatives and Hedging (Topic 815 2017 12” 1 2 3 4 5 December 15, 2018, not Goodwill Impairment January 2017, No. 2017 04, Intangibles – Goodwill and Other (Topic 350 2017 04” 2 not December 15, 2019, 2017. 2017 04 not Credit Losses on Financial Instruments June 2016, No. 2016 13, Financial Instruments – Credit Losses (Topic 326 2016 13” 2016 13 December 15, 2019, one first one Leases February 2016, No. 2016 02, Leases (Topic 842 2016 02” December 15, 2018, March 31, 2018, not There have been no 2017 10 not
Revenue from Contract with Customer [Policy Text Block]	Revenue from Contracts with Customers Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers 606 not two not 606. not 606 Certain revenue streams, such as service charges on deposit accounts, gains or losses on the sale of OREO, and trust income, fall under the scope of Topic 606 606 five 1 2 3 4 5 The Company has evaluated the nature of all contracts with customers that fall under the scope of Topic 606 not not not A description of performance obligations for each type of contract with customers is as follows: Service charges on deposit accounts not Sale of OREO Trust Income
Business Combinations Policy [Policy Text Block]	Acquisition Accounting, Loans Acquired The Company accounts for its acquisitions under ASC Topic 805, Business Combinations No 820, Fair Value Measurement The Company evaluates non-impaired loans acquired in accordance with the provisions of ASC Topic 310 20, Nonrefundable Fees and Other Costs 310 30, Loans and Debt Securities Acquired with Deteriorated Credit Quality not For impaired loans accounted for under ASC Topic 310 30, For further discussion of acquisition and loan accounting, see Note 2, 6,

Note 2 - Acquisitions (Tables)

Note 2 - Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	(In thousands) Acquired from Fair Value Fair Assets Acquired Cash and due from banks $ 79,517 $ -- $ 79,517 Investment securities 485,468 (1,295 ) 484,173 Loans acquired 2,039,524 (43,071 ) 1,996,453 Allowance for loan losses (26,957 ) 26,957 -- Foreclosed assets 6,284 (1,127 ) 5,157 Premises and equipment 21,210 5,457 26,667 Bank owned life insurance 28,704 -- 28,704 Goodwill 13,545 (13,545 ) -- Core deposit intangible 1,933 40,191 42,124 Other intangibles 3,806 -- 3,806 Other assets 33,455 (9,141 ) 24,314 Total assets acquired $ 2,686,489 $ 4,426 $ 2,690,915 Liabilities Assumed Deposits: Non-interest bearing transaction accounts $ 485,971 $ -- $ 485,971 Interest bearing transaction accounts and savings deposits 869,252 -- 869,252 Time deposits 613,345 (2,213 ) 611,132 Total deposits 1,968,568 (2,213 ) 1,966,355 Securities sold under agreement to repurchase 11,256 -- 11,256 Other borrowings 347,000 -- 347,000 Subordinated debentures 46,393 -- 46,393 Accrued interest and other liabilities 17,440 5,364 22,804 Total liabilities assumed 2,390,657 3,151 2,393,808 Equity 295,832 (295,832 ) -- Total equity assumed 295,832 (295,832 ) -- Total liabilities and equity assumed $ 2,686,489 $ (292,681 ) $ 2,393,808 Net assets acquired 297,107 Purchase price 526,251 Goodwill $ 229,144 (In thousands) Acquired from Fair Value Fair Assets Acquired Cash and due from banks $ 59,277 $ -- $ 59,277 Investment securities 81,114 (596 ) 80,518 Loans acquired 2,246,212 (37,834 ) 2,208,378 Allowance for loan losses (20,864 ) 20,664 (200 ) Premises and equipment 24,864 10,123 34,987 Bank owned life insurance 7,190 -- 7,190 Goodwill 37,227 (37,227 ) -- Core deposit intangible -- 7,328 7,328 Other assets 18,263 11,485 29,748 Total assets acquired $ 2,453,283 $ (26,057 ) $ 2,427,226 Liabilities Assumed Deposits: Non-interest bearing transaction accounts $ 74,410 $ -- $ 74,410 Interest bearing transaction accounts and savings deposits 1,683,298 -- 1,683,298 Time deposits 124,233 (283 ) 123,950 Total deposits 1,881,941 (283 ) 1,881,658 Securities sold under agreement to repurchase 50,000 -- 50,000 Other borrowings 235,000 -- 235,000 Subordinated debentures 30,323 589 30,912 Accrued interest and other liabilities 11,727 1,669 13,396 Total liabilities assumed 2,208,991 1,975 2,210,966 Equity 244,292 (244,292 ) -- Total equity assumed 244,292 (244,292 ) -- Total liabilities and equity assumed $ 2,453,283 $ (242,317 ) $ 2,210,966 Net assets acquired 216,260 Purchase price 457,103 Goodwill $ 240,843 (In thousands) Acquired from Fair Value Fair Assets Acquired Cash and due from banks $ 8,001 $ -- $ 8,001 Interest bearing balances due from banks - time 1,984 -- 1,984 Investment securities 170,654 (285 ) 170,369 Loans acquired 257,641 (5,992 ) 251,649 Allowance for loan losses (2,382 ) 2,382 -- Foreclosed assets 1,083 (452 ) 631 Premises and equipment 9,905 1,258 11,163 Bank owned life insurance 7,819 -- 7,819 Goodwill 11,485 (11,485 ) -- Core deposit intangible -- 7,840 7,840 Other intangibles -- 830 830 Other assets 2,639 (1 ) 2,638 Total assets acquired $ 468,829 $ (5,905 ) $ 462,924 Liabilities Assumed Deposits: Non-interest bearing transaction accounts $ 76,555 $ -- $ 76,555 Interest bearing transaction accounts and savings deposits 214,872 -- 214,872 Time deposits 97,917 (368 ) 97,549 Total deposits 389,344 (368 ) 388,976 Securities sold under agreement to repurchase 17,163 -- 17,163 Other borrowings 3,000 -- 3,000 Subordinated debentures 6,702 -- 6,702 Accrued interest and other liabilities 1,891 1,924 3,815 Total liabilities assumed 418,100 1,556 419,656 Equity 50,729 (50,729 ) -- Total equity assumed 50,729 (50,729 ) -- Total liabilities and equity assumed $ 468,829 $ (49,173 ) $ 419,656 Net assets acquired 43,268 Purchase price 72,639 Goodwill $ 29,371
Business Acquisition, Pro Forma Information [Table Text Block]	(In thousands, except per share data) 2017 2016 Revenue (1) $ 654,358 $ 620,461 Net income $ 130,947 $ 136,199 Diluted earnings per share $ 1.43 $ 1.52

Note 3 - Investment Securities

Note 3 - Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Investment [Table Text Block]	March 31, 2018 December 31, 2017 (In thousands) Amortized Gross Gross Unrealized Estimated Amortized Gross Gross Unrealized Estimated Held-to-Maturity U.S. Government agencies $ 46,961 $ 1 $ (259 ) $ 46,703 $ 46,945 $ 7 $ (228 ) $ 46,724 Mortgage-backed securities 15,404 -- (444 ) 14,960 16,132 8 (287 ) 15,853 State and political subdivisions 286,901 3,701 (1,106 ) 289,496 301,491 5,962 (222 ) 307,231 Other securities 3,490 -- -- 3,490 3,490 -- -- 3,490 Total HTM $ 352,756 $ 3,702 $ (1,809 ) $ 354,649 $ 368,058 $ 5,977 $ (737 ) $ 373,298 Available-for-Sale U.S. Government agencies $ 152,855 $ 15 $ (3,066 ) $ 149,804 $ 141,559 $ 116 $ (1,951 ) $ 139,724 Mortgage-backed securities 1,394,138 155 (38,114 ) 1,356,179 1,208,017 246 (20,946 ) 1,187,317 State and political subdivisions 191,018 100 (5,230 ) 185,888 144,642 532 (2,009 ) 143,165 Other securities 136,911 1,332 (1 ) 138,242 118,106 1,206 (1 ) 119,311 Total AFS $ 1,874,922 $ 1,602 $ (46,411 ) $ 1,830,113 $ 1,612,324 $ 2,100 $ (24,907 ) $ 1,589,517
Schedule of Unrealized Loss on Investments [Table Text Block]	Less Than 12 Months 12 Months or More Total (In thousands) Estimated Gross Estimated Gross Estimated Gross Held-to-Maturity U.S. Government agencies $ 12,957 $ (17 ) $ 32,758 $ (242 ) $ 45,715 $ (259 ) Mortgage-backed securities 5,897 (110 ) 8,479 (334 ) 14,376 (444 ) State and political subdivisions 100,221 (1,070 ) 1,595 (36 ) 101,816 (1,106 ) Total HTM $ 119,075 $ (1,197 ) $ 42,832 $ (612 ) $ 161,907 $ (1,809 ) Available-for-Sale U.S. Government agencies $ 120,100 $ (1,617 ) $ 25,326 $ (1,449 ) $ 145,426 $ (3,066 ) Mortgage-backed securities 725,518 (12,950 ) 589,543 (25,164 ) 1,315,061 (38,114 ) State and political subdivisions 95,659 (1,603 ) 73,293 (3,627 ) 168,952 (5,230 ) Other securities -- -- 99 (1 ) 99 (1 ) Total AFS $ 941,277 $ (16,170 ) $ 688,261 $ (30,241 ) $ 1,629,538 $ (46,411 )
Investment Income [Table Text Block]	(In thousands) 2018 2017 Taxable: Held-to-maturity $ 567 $ 661 Available-for-sale 9,032 5,816 Non-taxable: Held-to-maturity 1,936 2,283 Available-for-sale 1,087 691 Total $ 12,622 $ 9,451
Investments Classified by Contractual Maturity Date [Table Text Block]	Held-to-Maturity Available-for-Sale (In thousands) Amortized Fair Amortized Fair One year or less $ 48,493 $ 48,335 $ 370 $ 370 After one through five years 75,993 75,842 35,843 35,100 After five through ten years 92,585 92,633 22,926 22,342 After ten years 120,281 122,879 284,834 277,981 Securities not due on a single maturity date 15,404 14,960 1,394,138 1,356,179 Other securities (no maturity) -- -- 136,811 138,141 Total $ 352,756 $ 354,649 $ 1,874,922 $ 1,830,113

Note 5 - Loans and Allowance 33

Note 5 - Loans and Allowance for Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	(In thousands) March 31, December 31, Consumer: Credit cards $ 176,602 $ 185,422 Other consumer 284,285 280,094 Total consumer 460,887 465,516 Real Estate: Construction 786,077 614,155 Single family residential 1,193,464 1,094,633 Other commercial 2,611,358 2,530,824 Total real estate 4,590,899 4,239,612 Commercial: Commercial 971,704 825,217 Agricultural 128,247 148,302 Total commercial 1,099,951 973,519 Other 138,646 26,962 Loans 6,290,383 5,705,609 Loans acquired, net of discount and allowance (1) 4,696,945 5,074,076 Total loans $ 10,987,328 $ 10,779,685
Schedule of Financing Receivables, Non Accrual Status [Table Text Block]	(In thousands) March 31, December 31, Consumer: Credit cards $ 298 $ 170 Other consumer 4,711 4,605 Total consumer 5,009 4,775 Real estate: Construction 1,923 2,242 Single family residential 13,616 13,431 Other commercial 16,707 16,054 Total real estate 32,246 31,727 Commercial: Commercial 8,003 6,980 Agricultural 2,137 2,160 Total commercial 10,140 9,140 Total $ 47,395 $ 45,642
Past Due Financing Receivables [Table Text Block]	(In thousands) Gross 90 Days Total Current Total 90 Days March 31, 2018 Consumer: Credit cards $ 707 $ 672 $ 1,379 $ 175,223 $ 176,602 $ 233 Other consumer 3,407 3,176 6,583 277,702 284,285 33 Total consumer 4,114 3,848 7,962 452,925 460,887 266 Real estate: Construction 640 703 1,343 784,734 786,077 -- Single family residential 6,937 6,163 13,100 1,180,364 1,193,464 71 Other commercial 4,796 9,488 14,284 2,597,074 2,611,358 -- Total real estate 12,373 16,354 28,727 4,562,172 4,590,899 71 Commercial: Commercial 3,674 4,134 7,808 963,896 971,704 -- Agricultural 107 2,075 2,182 126,065 128,247 -- Total commercial 3,781 6,209 9,990 1,089,961 1,099,951 -- Other -- -- -- 138,646 138,646 -- Total $ 20,268 $ 26,411 $ 46,679 $ 6,243,704 $ 6,290,383 $ 337 December 31, 2017 Consumer: Credit cards $ 707 $ 672 $ 1,379 $ 184,043 $ 185,422 $ 332 Other consumer 5,009 3,298 8,307 271,787 280,094 10 Total consumer 5,716 3,970 9,686 455,830 465,516 342 Real estate: Construction 411 1,210 1,621 612,534 614,155 -- Single family residential 8,071 6,460 14,531 1,080,102 1,094,633 1 Other commercial 2,388 8,031 10,419 2,520,405 2,530,824 -- Total real estate 10,870 15,701 26,571 4,213,041 4,239,612 1 Commercial: Commercial 1,523 6,125 7,648 817,569 825,217 -- Agricultural 50 2,120 2,170 146,132 148,302 -- Total commercial 1,573 8,245 9,818 963,701 973,519 -- Other -- -- -- 26,962 26,962 -- Total $ 18,159 $ 27,916 $ 46,075 $ 5,659,534 $ 5,705,609 $ 343
Impaired Financing Receivables [Table Text Block]	(In thousands) Unpaid Recorded Investment Recorded Total Related Average Interest March 31, 2018 Three Months Ended Consumer: Credit cards $ 298 $ 298 $ -- $ 298 $ -- $ 234 $ 15 Other consumer 4,849 4,711 -- 4,711 -- 4,658 34 Total consumer 5,147 5,009 -- 5,009 -- 4,892 49 Real estate: Construction 2,392 1,220 702 1,922 249 2,082 16 Single family residential 14,605 13,057 559 13,616 32 13,523 100 Other commercial 22,500 8,135 8,573 16,708 145 16,287 120 Total real estate 39,497 22,412 9,834 32,246 426 31,892 236 Commercial: Commercial 8,480 7,119 758 7,877 18 7,226 53 Agricultural 3,256 2,137 -- 2,137 -- 1,586 12 Total commercial 11,736 9,256 758 10,014 18 8,812 65 Total $ 56,380 $ 36,677 $ 10,592 $ 47,269 $ 444 $ 45,596 $ 350 December 31, 2017 Three Months Ended Consumer: Credit cards $ 170 $ 170 $ -- $ 170 $ -- $ 302 $ 5 Other consumer 4,755 4,605 -- 4,605 -- 2,107 13 Total consumer 4,925 4,775 -- 4,775 -- 2,409 18 Real estate: Construction 2,522 1,347 895 2,242 249 3,074 20 Single family residential 14,347 12,725 706 13,431 53 12,667 81 Other commercial 22,308 6,732 9,133 15,865 36 19,321 123 Total real estate 39,177 20,804 10,734 31,538 338 35,062 224 Commercial: Commercial 9,954 4,306 2,269 6,575 -- 11,344 72 Agricultural 3,278 1,035 -- 1,035 -- 1,726 11 Total commercial 13,232 5,341 2,269 7,610 -- 13,070 83 Total $ 57,334 $ 30,920 $ 13,003 $ 43,923 $ 338 $ 50,541 $ 325
Troubled Debt Restructurings on Financing Receivables [Table Text Block]	Accruing TDR Loans Nonaccrual TDR Loans Total TDR Loans (Dollars in thousands) Number Balance Number Balance Number Balance March 31, 2018 Consumer: Other consumer 1 $ 91 -- $ -- 1 $ 91 Total consumer 1 91 -- -- 1 91 Real estate: Construction -- -- 1 408 1 408 Single-family residential 5 201 13 802 18 1,003 Other commercial 4 4,270 4 3,350 8 7,620 Total real estate 9 4,471 18 4,560 27 9,031 Commercial: Commercial 4 1,897 6 738 10 2,635 Total commercial 4 1,897 6 738 10 2,635 Total 14 $ 6,459 24 $ 5,298 38 $ 11,757 December 31, 2017 Real estate: Construction -- $ -- 1 $ 420 1 $ 420 Single-family residential 4 141 15 954 19 1,095 Other commercial 4 4,322 5 3,712 9 8,034 Total real estate 8 4,463 21 5,086 29 9,549 Commercial: Commercial 5 2,644 6 745 11 3,389 Total commercial 5 2,644 6 745 11 3,389 Total 13 $ 7,107 27 $ 5,831 40 $ 12,938
Schedule of Loans Restructured as TDRs [Table Text Block]	Modification Type (Dollars in thousands) Number of Balance Prior Balance at Change in Change in Financial Impact Three Months Ended March 31, 2018 Consumer: Other consumer 1 $ 91 $ 91 $ 91 $ -- $ -- Total consumer 1 91 91 91 -- -- Real estate: Single-family residential 1 61 62 62 -- -- Total real estate 1 61 62 62 -- -- Total 2 $ 152 $ 153 $ 153 $ -- $ -- Three Months Ended March 31, 2017 Real estate: Construction 1 $ 456 $ 456 $ 456 $ -- $ -- Other commercial 2 7,362 7,362 7,362 -- 33 Total real estate 3 7,818 7,818 7,818 -- 33 Commercial: Commercial 5 770 760 760 -- -- Total commercial 5 770 760 760 -- -- Total 8 $ 8,588 $ 8,578 $ 8,578 $ -- $ 33
Financing Receivable Credit Quality Indicators [Table Text Block]	(In thousands) Risk Rate Risk Rate Risk Rate Risk Rate Risk Rate Total March 31, 2018 Consumer: Credit cards $ 176,071 $ -- $ 531 $ -- $ -- $ 176,602 Other consumer 279,414 -- 4,871 -- -- 284,285 Total consumer 455,485 -- 5,402 -- -- 460,887 Real estate: Construction 778,757 2,344 4,960 16 -- 786,077 Single family residential 1,168,255 1,790 23,197 222 -- 1,193,464 Other commercial 2,572,032 7,076 32,250 -- -- 2,611,358 Total real estate 4,519,044 11,210 60,407 238 -- 4,590,899 Commercial: Commercial 953,138 6,140 12,426 -- -- 971,704 Agricultural 124,938 325 2,961 23 -- 128,247 Total commercial 1,078,076 6,465 15,387 23 -- 1,099,951 Other 138,646 -- -- -- -- 138,646 Loans acquired 4,545,941 54,664 95,842 498 -- 4,696,945 Total $ 10,737,192 $ 72,339 $ 177,038 $ 759 $ -- $ 10,987,328 (In thousands) Risk Rate Risk Rate Risk Rate Risk Rate Risk Rate Total December 31, 2017 Consumer: Credit cards $ 184,920 $ -- $ 502 $ -- $ -- $ 185,422 Other consumer 275,160 -- 4,934 -- -- 280,094 Total consumer 460,080 -- 5,436 -- -- 465,516 Real estate: Construction 603,126 5,795 5,218 16 -- 614,155 Single family residential 1,066,902 3,954 23,490 287 -- 1,094,633 Other commercial 2,480,293 19,581 30,950 -- -- 2,530,824 Total real estate 4,150,321 29,330 59,658 303 -- 4,239,612 Commercial: Commercial 736,377 74,254 14,402 50 134 825,217 Agricultural 146,065 24 2,190 23 -- 148,302 Total commercial 882,442 74,278 16,592 73 134 973,519 Other 26,962 -- -- -- -- 26,962 Loans acquired 4,782,384 198,314 93,378 -- -- 5,074,076 Total $ 10,302,189 $ 301,922 $ 175,064 $ 376 $ 134 $ 10,779,685
Allowance for Credit Losses on Financing Receivables [Table Text Block]	(In thousands) Commercial Real Credit Other Total Three Months Ended March 31, 2018 Balance, beginning of period $ 7,007 $ 27,281 $ 3,784 $ 3,596 $ 41,668 Provision for loan losses (1) 4,286 3,286 751 759 9,082 Charge-offs (1,761 ) (455 ) (999 ) (1,056 ) (4,271 ) Recoveries 69 302 263 94 728 Net charge-offs (1,692 ) (153 ) (736 ) (962 ) (3,543 ) Balance, March 31, 2018 (2) $ 9,601 $ 30,414 $ 3,799 $ 3,393 $ 47,207 Period-end amount allocated to: Loans individually evaluated for impairment $ 18 $ 426 $ -- $ -- $ 444 Loans collectively evaluated for impairment 9,583 29,988 3,799 3,393 46,763 Balance, March 31, 2018 (2) $ 9,601 $ 30,414 $ 3,799 $ 3,393 $ 47,207 (In thousands) Commercial Real Credit Other Total Three Months Ended March 31, 2017 Balance, beginning of period $ 7,739 $ 21,817 $ 3,779 $ 2,951 $ 36,286 Provision for loan losses (1) 696 860 758 1,243 3,557 Charge-offs (292 ) (656 ) (1,044 ) (1,174 ) (3,166 ) Recoveries 30 232 236 690 1,188 Net charge-offs (262 ) (424 ) (808 ) (484 ) (1,978 ) Balance, March 31, 2017 (2) $ 8,173 $ 22,253 $ 3,729 $ 3,710 $ 37,865 Period-end amount allocated to: Loans individually evaluated for impairment $ 708 $ 837 $ -- $ 1 $ 1,546 Loans collectively evaluated for impairment 7,465 21,416 3,729 3,709 36,319 Balance, March 31, 2017 (2) $ 8,173 $ 22,253 $ 3,729 $ 3,710 $ 37,865 Period-end amount allocated to: Loans individually evaluated for impairment $ -- $ 338 $ -- $ -- $ 338 Loans collectively evaluated for impairment 7,007 26,943 3,784 3,596 41,330 Balance, December 31, 2017 (2) $ 7,007 $ 27,281 $ 3,784 $ 3,596 $ 41,668
Schedule of Loans by impairment evaluation [Table Text Block]	(In thousands) Commercial Real Credit Other Total March 31, 2018 Loans individually evaluated for impairment $ 10,014 $ 32,246 $ 298 $ 4,711 $ 47,269 Loans collectively evaluated for impairment 1,089,937 4,558,653 176,304 418,220 6,243,114 Balance, end of period $ 1,099,951 $ 4,590,899 $ 176,602 $ 422,931 $ 6,290,383 December 31, 2017 Loans individually evaluated for impairment $ 7,610 $ 31,538 $ 170 $ 4,605 $ 43,923 Loans collectively evaluated for impairment 965,909 4,208,074 185,252 302,451 5,661,686 Balance, end of period $ 973,519 $ 4,239,612 $ 185,422 $ 307,056 $ 5,705,609

Note 6 - Loans Acquired (Tables

Note 6 - Loans Acquired (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Carrying Value Of All Acquired Impaired Loans [Table Text Block]	Loans Acquired (In thousands) March 31, December 31, Consumer: Other consumer $ 43,090 $ 51,467 Real estate: Construction 591,533 637,032 Single family residential 747,597 793,228 Other commercial 2,420,121 2,387,777 Total real estate 3,759,251 3,818,037 Commercial: Commercial 891,261 995,587 Agricultural 3,343 66,576 Total commercial 894,604 1,062,163 Other -- 142,409 Total loans acquired (1) $ 4,696,945 $ 5,074,076
Schedule of Financing Receivables, Non Accrual Status [Table Text Block]	(In thousands) March 31, December 31, Consumer: Credit cards $ 298 $ 170 Other consumer 4,711 4,605 Total consumer 5,009 4,775 Real estate: Construction 1,923 2,242 Single family residential 13,616 13,431 Other commercial 16,707 16,054 Total real estate 32,246 31,727 Commercial: Commercial 8,003 6,980 Agricultural 2,137 2,160 Total commercial 10,140 9,140 Total $ 47,395 $ 45,642
Past Due Financing Receivables [Table Text Block]	(In thousands) Gross 90 Days Total Current Total 90 Days March 31, 2018 Consumer: Credit cards $ 707 $ 672 $ 1,379 $ 175,223 $ 176,602 $ 233 Other consumer 3,407 3,176 6,583 277,702 284,285 33 Total consumer 4,114 3,848 7,962 452,925 460,887 266 Real estate: Construction 640 703 1,343 784,734 786,077 -- Single family residential 6,937 6,163 13,100 1,180,364 1,193,464 71 Other commercial 4,796 9,488 14,284 2,597,074 2,611,358 -- Total real estate 12,373 16,354 28,727 4,562,172 4,590,899 71 Commercial: Commercial 3,674 4,134 7,808 963,896 971,704 -- Agricultural 107 2,075 2,182 126,065 128,247 -- Total commercial 3,781 6,209 9,990 1,089,961 1,099,951 -- Other -- -- -- 138,646 138,646 -- Total $ 20,268 $ 26,411 $ 46,679 $ 6,243,704 $ 6,290,383 $ 337 December 31, 2017 Consumer: Credit cards $ 707 $ 672 $ 1,379 $ 184,043 $ 185,422 $ 332 Other consumer 5,009 3,298 8,307 271,787 280,094 10 Total consumer 5,716 3,970 9,686 455,830 465,516 342 Real estate: Construction 411 1,210 1,621 612,534 614,155 -- Single family residential 8,071 6,460 14,531 1,080,102 1,094,633 1 Other commercial 2,388 8,031 10,419 2,520,405 2,530,824 -- Total real estate 10,870 15,701 26,571 4,213,041 4,239,612 1 Commercial: Commercial 1,523 6,125 7,648 817,569 825,217 -- Agricultural 50 2,120 2,170 146,132 148,302 -- Total commercial 1,573 8,245 9,818 963,701 973,519 -- Other -- -- -- 26,962 26,962 -- Total $ 18,159 $ 27,916 $ 46,075 $ 5,659,534 $ 5,705,609 $ 343
Financing Receivable Credit Quality Indicators [Table Text Block]	(In thousands) Risk Rate Risk Rate Risk Rate Risk Rate Risk Rate Total March 31, 2018 Consumer: Credit cards $ 176,071 $ -- $ 531 $ -- $ -- $ 176,602 Other consumer 279,414 -- 4,871 -- -- 284,285 Total consumer 455,485 -- 5,402 -- -- 460,887 Real estate: Construction 778,757 2,344 4,960 16 -- 786,077 Single family residential 1,168,255 1,790 23,197 222 -- 1,193,464 Other commercial 2,572,032 7,076 32,250 -- -- 2,611,358 Total real estate 4,519,044 11,210 60,407 238 -- 4,590,899 Commercial: Commercial 953,138 6,140 12,426 -- -- 971,704 Agricultural 124,938 325 2,961 23 -- 128,247 Total commercial 1,078,076 6,465 15,387 23 -- 1,099,951 Other 138,646 -- -- -- -- 138,646 Loans acquired 4,545,941 54,664 95,842 498 -- 4,696,945 Total $ 10,737,192 $ 72,339 $ 177,038 $ 759 $ -- $ 10,987,328 (In thousands) Risk Rate Risk Rate Risk Rate Risk Rate Risk Rate Total December 31, 2017 Consumer: Credit cards $ 184,920 $ -- $ 502 $ -- $ -- $ 185,422 Other consumer 275,160 -- 4,934 -- -- 280,094 Total consumer 460,080 -- 5,436 -- -- 465,516 Real estate: Construction 603,126 5,795 5,218 16 -- 614,155 Single family residential 1,066,902 3,954 23,490 287 -- 1,094,633 Other commercial 2,480,293 19,581 30,950 -- -- 2,530,824 Total real estate 4,150,321 29,330 59,658 303 -- 4,239,612 Commercial: Commercial 736,377 74,254 14,402 50 134 825,217 Agricultural 146,065 24 2,190 23 -- 148,302 Total commercial 882,442 74,278 16,592 73 134 973,519 Other 26,962 -- -- -- -- 26,962 Loans acquired 4,782,384 198,314 93,378 -- -- 5,074,076 Total $ 10,302,189 $ 301,922 $ 175,064 $ 376 $ 134 $ 10,779,685
Tabular Temporal Display Of Adjustments Related To Purchased Covered Impaired Loans [Table Text Block]	Three Months Ended (In thousands) 2018 2017 Impact on net interest income and pre-tax income $ 450 $ 1,184 Impact, net of taxes $ 331 $ 720
Tabular Temporal Display of Accretable Yield [Table Text Block]	Three Months Ended Three Months Ended (In thousands) Accretable Carrying Accretable Carrying Beginning balance $ 620 $ 17,116 $ 1,655 $ 17,802 Additions -- -- -- -- Accretable yield adjustments 1,134 -- 1,228 -- Accretion (385 ) 385 (1,666 ) 1,666 Payments and other reductions, net -- 104 -- (10,773 ) Balance, ending $ 1,369 $ 17,605 $ 1,217 $ 8,695
Acquired Loans [Member]
Notes Tables
Schedule of Financing Receivables, Non Accrual Status [Table Text Block]	(In thousands) March 31, December 31, Consumer: Other consumer $ 570 $ 334 Real estate: Construction 241 1,767 Single family residential 8,072 12,151 Other commercial 19,626 7,401 Total real estate 27,939 21,319 Commercial: Commercial 1,518 1,748 Agricultural 152 84 Total commercial 1,670 1,832 Total $ 30,179 $ 23,485
Past Due Financing Receivables [Table Text Block]	(In thousands) Gross 90 Days Total Current Total 90 Days March 31, 2018 Consumer: Other consumer $ 444 $ 152 $ 596 $ 42,494 $ 43,090 $ -- Real estate: Construction 162 1,504 1,666 589,867 591,533 -- Single family residential 7,938 5,353 13,291 734,306 747,597 -- Other commercial 1,480 3,940 5,420 2,414,701 2,420,121 -- Total real estate 9,580 10,797 20,377 3,738,874 3,759,251 -- Commercial: Commercial 1,697 569 2,266 888,995 891,261 -- Agricultural 43 119 162 3,181 3,343 -- Total commercial 1,740 688 2,428 892,176 894,604 -- Total $ 11,764 $ 11,637 $ 23,401 $ 4,673,544 $ 4,696,945 $ -- December 31, 2017 Consumer: Other consumer $ 889 $ 260 $ 1,149 $ 50,318 $ 51,467 $ 108 Real estate: Construction 2,577 1,448 4,025 633,007 637,032 279 Single family residential 12,936 3,302 16,238 776,990 793,228 126 Other commercial 17,176 5,647 22,823 2,364,954 2,387,777 2,565 Total real estate 32,689 10,397 43,086 3,774,951 3,818,037 2,970 Commercial: Commercial 2,344 1,039 3,383 992,204 995,587 67 Agricultural 51 -- 51 66,525 66,576 -- Total commercial 2,395 1,039 3,434 1,058,729 1,062,163 67 Other 15 -- 15 142,394 142,409 -- Total $ 35,988 $ 11,696 $ 47,684 $ 5,026,392 $ 5,074,076 $ 3,145
Financing Receivable Credit Quality Indicators [Table Text Block]	(In thousands) Risk Rate Risk Rate Risk Rate Risk Rate Risk Rate Total March 31, 2018 Consumer: Other consumer $ 41,995 $ 14 $ 1,081 $ -- $ -- $ 43,090 Real estate: Construction 570,334 19,624 1,575 -- -- 591,533 Single family residential 726,224 1,917 18,958 498 -- 747,597 Other commercial 2,374,014 12,663 33,444 -- -- 2,420,121 Total real estate 3,670,572 34,204 53,977 498 -- 3,759,251 Commercial: Commercial 830,225 20,446 40,590 -- -- 891,261 Agricultural 3,149 -- 194 -- -- 3,343 Total commercial 833,374 20,446 40,784 -- -- 894,604 Total $ 4,545,941 $ 54,664 $ 95,842 $ 498 $ -- $ 4,696,945 December 31, 2017 Consumer: Other consumer $ 50,625 $ 21 $ 821 $ -- $ -- $ 51,467 Real estate: Construction 604,796 30,524 1,712 -- -- 637,032 Single family residential 770,954 2,618 19,656 -- -- 793,228 Other commercial 2,337,097 15,064 35,616 -- -- 2,387,777 Total real estate 3,712,847 48,206 56,984 -- -- 3,818,037 Commercial: Commercial 946,322 13,901 35,364 -- -- 995,587 Agricultural 66,367 -- 209 -- -- 66,576 Total commercial 1,012,689 13,901 35,573 -- -- 1,062,163 Other 142,409 -- -- -- -- 142,409 Total $ 4,918,570 $ 62,128 $ 93,378 $ -- $ -- $ 5,074,076

Note 7 - Goodwill and Other I35

Note 7 - Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Schedule of Intangible Assets and Goodwill [Table Text Block]	(In thousands) March 31, December 31, Goodwill $ 845,687 $ 842,651 Core deposit premiums: Gross carrying amount 105,984 105,984 Accumulated amortization (19,009 ) (16,659 ) Core deposit premiums, net 86,975 89,325 Books of business intangible: Gross carrying amount 15,234 15,414 Accumulated amortization (2,912 ) (2,827 ) Books of business intangible, net 12,322 12,587 Other intangibles: Gross carrying amount 2,068 6,037 Accumulated amortization (1,861 ) (1,878 ) Other intangibles, net 207 4,159 Other intangible assets, net 99,504 106,071 Total goodwill and other intangible assets $ 945,191 $ 948,722
Core Deposit Premium [Member]
Notes Tables
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	(In thousands) Year Amortization Remainder of 2018 $ 8,171 2019 10,565 2020 10,552 2021 10,490 2022 10,438 Thereafter 49,288 Total $ 99,504

Note 9 - Income Taxes (Tables)

Note 9 - Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	(In thousands) March 31, March 31, Income taxes currently payable $ 10,045 $ 6,601 Deferred income taxes 3,921 3,090 Provision for income taxes $ 13,966 $ 9,691
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	(In thousands) March 31, December 31, Deferred tax assets: Loans acquired $ 18,418 $ 19,885 Allowance for loan losses 12,294 10,773 Valuation of foreclosed assets 2,852 2,852 Tax NOLs from acquisition 7,727 7,821 Deferred compensation payable 2,534 2,433 Accrued equity and other compensation 4,472 5,302 Acquired securities 578 578 Unrealized loss on available-for-sale securities 12,217 6,107 Other 7,279 8,813 Gross deferred tax assets 68,371 64,564 Deferred tax liabilities: Goodwill and other intangible amortization (32,579 ) (32,572 ) Accumulated depreciation (9,317 ) (8,945 ) Other (4,103 ) (4,413 ) Gross deferred tax liabilities (45,999 ) (45,930 ) Net deferred tax asset, included in other assets $ 22,372 $ 18,634
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	(In thousands) March 31, March 31, Computed at the statutory rate (1) $ 13,708 $ 11,134 Increase (decrease) in taxes resulting from: State income taxes, net of federal tax benefit 1,822 539 Discrete items related to ASU 2016-09 (273 ) (1,082 ) Tax exempt interest income (677 ) (1,071 ) Tax exempt earnings on BOLI (186 ) (218 ) Other differences, net (428 ) 389 Actual tax provision $ 13,966 $ 9,691

Note 10 - Securities Sold Und37

Note 10 - Securities Sold Under Agreements to Repurchase (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Schedule of Repurchase Agreements [Table Text Block]	Remaining Contractual Maturity of the Agreements (In thousands) Overnight and Up to 30 Days 30-90 Days Greater than Total March 31, 2018 Repurchase agreements: U.S. Government agencies $ 114,634 $ -- $ -- $ -- $ 114,634 December 31, 2017 Repurchase agreements: U.S. Government agencies $ 122,019 $ -- $ -- $ -- $ 122,019

Note 11 - Other Borrowings an38

Note 11 - Other Borrowings and Subordinated Notes and Debentures (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Schedule of Debt [Table Text Block]	(In thousands) March 31, December 31, Other Borrowings FHLB advances, net of discount, due 2018 to 2033, 1.33% to 7.37% secured by residential real estate loans $ 1,140,986 $ 1,261,642 Revolving credit agreement, due 10/5/2018, floating rate of 1.50% above the one month LIBOR rate, unsecured -- 75,000 Notes payable, due 10/15/2020, 3.85%, fixed rate, unsecured -- 43,382 Total other borrowings 1,140,986 1,380,024 Subordinated Notes and Debentures Subordinated notes payable, due 4/1/2028, fixed-to-floating rate (fixed rate of 5.00% through 3/31/2023, floating rate of 2.15% above the three month LIBOR rate, reset quarterly) 330,000 -- Trust preferred securities, due 12/30/2033, floating rate of 2.80% above the three month LIBOR rate, reset quarterly, callable without penalty 20,620 20,620 Trust preferred securities, net of discount, due 6/30/2035, floating rate of 1.75% above the three month LIBOR rate, reset quarterly, callable without penalty 9,344 9,327 Trust preferred securities, net of discount, due 9/15/2037, floating rate of 1.37% above the three month LIBOR rate, reset quarterly 10,310 10,284 Trust preferred securities, net of discount, due 12/5/2033, floating rate of 2.88% above the three month LIBOR rate, reset quarterly, callable without penalty 5,155 5,156 Trust preferred securities, net of discount, due 10/18/2034, floating rate of 2.00% above the three month LIBOR rate, reset quarterly, callable without penalty 5,155 5,148 Trust preferred securities, net of discount, due 6/6/2037, floating rate of 1.57% above the three month LIBOR rate, reset quarterly, callable without penalty 10,310 10,288 Trust preferred securities, due 12/15/2035, floating rate of 1.45% above the three month LIBOR rate, reset quarterly, callable without penalty 6,702 6,702 Trust preferred securities, due 6/26/2033, floating rate of 3.10% above the three month LIBOR rate, reset quarterly, callable without penalty 20,619 20,619 Trust preferred securities, due 10/7/2033, floating rate of 2.85% above the three month LIBOR rate, reset quarterly, callable without penalty 25,774 25,774 Trust preferred securities, due 9/15/2037, floating rate of 2.00% above the three month LIBOR rate, reset quarterly, callable without penalty 8,248 8,248 Other subordinated debentures, net of discount, due 9/30/2023, floating rate equal to daily average of prime rate, reset quarterly 19,517 18,399 Unamortized debt issuance costs (3,289 ) -- Total subordinated notes and debentures 468,465 140,565 Total other borrowings and subordinated debt $ 1,609,451 $ 1,520,589
Schedule of Maturities of Long-term Debt [Table Text Block]	(In thousands) Year Annual 2018 $ 102,899 2019 2,577 2020 2,474 2021 2,165 2022 1,314 Thereafter 845,022 Total $ 956,451

Note 15 - Stock Based Compens39

Note 15 - Stock Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Share-based Compensation, Stock Options, Activity [Table Text Block]	Stock Options Non-vested Non-vested Number Weighted Number Weighted Number Weighted Balance, January 1, 2018 812 $ 21.98 162 $ 20.86 652 $ 27.92 Granted -- -- -- -- 280 29.16 Stock Options Exercised (83 ) 20.67 -- -- -- -- Stock Awards/Units Vested -- -- (40 ) 17.89 (144 ) 27.87 Forfeited/Expired (3 ) 23.51 (9 ) 19.67 (46 ) 28.22 Balance, March 31, 2018 726 $ 22.12 113 $ 22.01 742 $ 28.38 Exercisable, March 31, 2018 693 $ 22.06
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]	Options Outstanding Options Exercisable Range of Exercise Prices Number of Shares (000) Weighted Average Remaining Contractual Life (Years) Weighted Average Exercise Price Number of Shares (000) Weighted Average Exercise Price $8.78 - $9.46 3 1.97 $ 9.22 3 $ 9.22 10.65 - 10.65 5 3.90 10.65 5 10.65 10.76 - 10.76 2 1.80 10.76 2 10.76 15.16 - 15.16 25 0.16 15.16 25 15.16 20.29 - 20.29 70 6.75 20.29 70 20.29 20.36 - 20.36 3 6.63 20.36 2 20.36 22.20 - 22.20 76 6.98 22.20 76 22.20 22.75 - 22.75 436 7.36 22.75 436 22.75 23.51 - 23.51 99 7.66 23.51 67 23.51 24.07 - 24.07 7 7.46 24.07 7 24.07 $8.78 $24.07 726 6.99 $ 22.12 693 $ 22.06

Note 16 - Earnings Per Share 40

Note 16 - Earnings Per Share ("EPS") (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	(In thousands, except per share data) 2018 2017 Net income $ 51,312 $ 22,120 Average common shares outstanding 92,182 62,702 Average potential dilutive common shares 457 524 Average diluted common shares 92,639 63,226 Basic earnings per share $ 0.56 $ 0.35 Diluted earnings per share $ 0.55 $ 0.35

Note 17 - Additional Cash Flo41

Note 17 - Additional Cash Flow Information (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]	Three Months Ended (In thousands) 2018 2017 Interest paid $ 22,863 $ 6,160 Income taxes (refunded) paid (7,375 ) 23 Transfers of loans to foreclosed assets held for sale 1,316 2,044 Transfers of premises to foreclosed assets and other real estate owned 106 --

Note 18 - Other Operating Exp42

Note 18 - Other Operating Expenses (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Schedule of Other Operating Cost and Expense, by Component [Table Text Block]	Three Months Ended (In thousands) 2018 2017 Professional services $ 4,330 $ 5,169 Postage 1,399 1,131 Telephone 1,486 1,078 Credit card expense 3,228 2,837 Marketing 1,660 1,364 Operating supplies 749 355 Amortization of intangibles 2,837 1,550 Branch right sizing expense 61 118 Other expense 9,744 6,285 Total other operating expenses $ 25,494 $ 19,887

Note 21 - Fair Value Measurem43

Note 21 - Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	Fair Value Measurements Using (In thousands) Fair Value Quoted Prices in Significant Other Significant March 31, 2018 Available-for-sale securities U.S. Government agencies $ 149,804 $ -- $ 149,804 $ -- Mortgage-backed securities 1,356,179 -- 1,356,179 -- State and political subdivisions 185,888 -- 185,888 -- Other securities 138,242 -- 138,242 -- Other assets held for sale 24,784 -- -- 24,784 Derivative asset 6,381 -- 6,381 -- Other liabilities held for sale (2,781 ) -- -- (2,781 ) Derivative liability (6,326 ) -- (6,326 ) -- December 31, 2017 Available-for-sale securities U.S. Government agencies $ 139,724 $ -- $ 139,724 $ -- Mortgage-backed securities 1,187,317 -- 1,187,317 -- States and political subdivisions 143,165 -- 143,165 -- Other securities 119,311 -- 119,311 -- Other assets held for sale 165,780 -- -- 165,780 Derivative asset 3,634 -- 3,634 -- Other liabilities held for sale (157,366 ) -- -- (157,366 ) Derivative liability (3,068 ) -- (3,068 ) --
Fair Value Measurements, Nonrecurring [Table Text Block]	Fair Value Measurements Using (In thousands) Fair Value Quoted Prices in Significant Other Significant March 31, 2018 Impaired loans (1) (2) $ 12,358 $ -- $ -- $ 12,358 Foreclosed assets and other real estate owned (1) 23,983 -- -- 23,983 December 31, 2017 Impaired loans (1) (2) $ 11,229 $ -- $ -- $ 11,229 Foreclosed assets and other real estate owned (1) 24,093 -- -- 24,093
Fair Value, by Balance Sheet Grouping [Table Text Block]	Carrying Fair Value Measurements (In thousands) Amount Level 1 Level 2 Level 3 Total March 31, 2018 Financial assets: Cash and cash equivalents $ 859,664 $ 859,664 $ -- $ -- $ 859,664 Interest bearing balances due from banks - time 3,069 -- 3,069 -- 3,069 Held-to-maturity securities 352,756 -- 354,649 -- 354,649 Mortgage loans held for sale 17,708 -- -- 17,708 17,708 Interest receivable 42,129 -- 42,129 -- 42,129 Legacy loans, net 6,243,176 -- -- 6,214,776 6,214,776 Loans acquired, net 4,696,945 -- -- 4,675,579 4,675,579 Financial liabilities: Non-interest bearing transaction accounts 2,734,287 -- 2,734,287 -- 2,734,287 Interest bearing transaction accounts and savings deposits 6,720,754 -- 6,720,754 -- 6,720,754 Time deposits 2,201,874 -- -- 2,179,221 2,179,221 Federal funds purchased and securities sold under agreements to repurchase 120,909 -- 120,909 -- 120,909 Other borrowings 1,140,986 -- 1,145,193 -- 1,145,193 Subordinated notes and debentures 468,465 -- 413,968 -- 413,968 Interest payable 3,874 -- 3,874 -- 3,874 December 31, 2017 Financial assets: Cash and cash equivalents $ 598,042 $ 598,042 $ -- $ -- $ 598,042 Interest bearing balances due from banks - time 3,314 -- 3,314 -- 3,314 Held-to-maturity securities 368,058 -- 373,298 -- 373,298 Mortgage loans held for sale 24,038 -- -- 24,038 24,038 Interest receivable 43,528 -- 43,528 -- 43,528 Legacy loans, net 5,663,941 -- -- 5,646,505 5,646,505 Loans acquired, net 5,074,076 -- -- 5,058,455 5,058,455 Financial liabilities: Non-interest bearing transaction accounts 2,665,249 -- 2,665,249 -- 2,665,249 Interest bearing transaction accounts and savings deposits 6,494,896 -- 6,494,896 -- 6,494,896 Time deposits 1,932,730 -- -- 1,915,539 1,915,539 Federal funds purchased and securities sold under agreements to repurchase 122,444 -- 122,444 -- 122,444 Other borrowings 1,380,024 -- 1,381,365 -- 1,381,365 Subordinated debentures 140,565 -- 136,474 -- 136,474 Interest payable 4,564 -- 4,564 -- 4,564

Note 1 - Preparation of Inter44

Note 1 - Preparation of Interim Financial Statements (Details Textual) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017USD ($)	Mar. 31, 2018
Number of Financial Centers			200
Stockholders' Equity, Effects of Tax Law Changes
AOCI Attributable to Parent [Member]
Stockholders' Equity, Effects of Tax Law Changes		(3,016)
AOCI Attributable to Parent [Member] | Accounting Standards Update 2018-02 [Member]
Stockholders' Equity, Effects of Tax Law Changes	$ (3,000)
Retained Earnings [Member]
Stockholders' Equity, Effects of Tax Law Changes		$ 3,016
Retained Earnings [Member] | Accounting Standards Update 2018-02 [Member]
Stockholders' Equity, Effects of Tax Law Changes	$ 3,000

Note 2 - Acquisitions (Details

Note 2 - Acquisitions (Details Textual) $ in Thousands	Oct. 19, 2017USD ($)shares	May 15, 2017USD ($)shares	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Goodwill, Ending Balance			$ 845,687	$ 842,651
OKSB Merger [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares	14,488,604
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	$ 431,400
Payments to Acquire Businesses, Gross	$ 94,900
Number of Bank Branches	29
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total	$ 2,690,915
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share	2,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Deposits	1,966,355
Goodwill, Ending Balance	229,144
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual			29,200
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual			10,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans	$ 1,996,453
First Texas Merger [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares	12,999,840
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	$ 387,100
Payments to Acquire Businesses, Gross	$ 70,000
Number of Bank Branches	15
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total	$ 2,427,226
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share	2,200,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Deposits	1,881,658
Goodwill, Ending Balance	240,843
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual			27,600
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual			$ 5,700
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans	$ 2,208,378
OKSB and First Texas Acquisitions [Member]
Business Combination, Acquisition Related Costs				$ 9,400
Hardeman County Investment Company, Inc. [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares		1,599,940
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned		$ 42,600
Payments to Acquire Businesses, Gross		$ 30,000
Number of Bank Branches		10
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total		$ 462,924
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Deposits		388,976
Goodwill, Ending Balance		29,371
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans		$ 251,649

Note 2 - Acquisitions - Assets

Note 2 - Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Oct. 19, 2017	May 15, 2017	Mar. 31, 2018	Dec. 31, 2017
Goodwill, Ending Balance			$ 845,687	$ 842,651
Goodwill			$ 845,687	$ 842,651
OKSB Merger [Member]
Cash and due from banks	$ 79,517
Investment securities	484,173
Loans acquired	1,996,453
Allowance for loan losses
Foreclosed assets	5,157
Premises and equipment	26,667
Bank owned life insurance	28,704
Goodwill, Ending Balance	229,144
Other assets	24,314
Total assets acquired	2,690,915
Non-interest bearing transaction accounts	485,971
Interest bearing transaction accounts and savings deposits	869,252
Time deposits	611,132
Total deposits	1,966,355
Securities sold under agreement to repurchase	11,256
Other borrowings	347,000
Subordinated debentures	46,393
Accrued interest and other liabilities	22,804
Total liabilities assumed	2,393,808
Equity
Total liabilities and equity assumed	2,393,808
Net assets acquired	297,107
Purchase price	526,251
Goodwill	229,144
OKSB Merger [Member] | Core Deposit Premium [Member]
Intangibles	42,124
OKSB Merger [Member] | Other Intangible Assets [Member]
Intangibles	3,806
OKSB Merger [Member] | Cost Acquired [Member]
Cash and due from banks	79,517
Investment securities	485,468
Loans acquired	2,039,524
Allowance for loan losses	(26,957)
Foreclosed assets	6,284
Premises and equipment	21,210
Bank owned life insurance	28,704
Goodwill, Ending Balance	13,545
Other assets	33,455
Total assets acquired	2,686,489
Non-interest bearing transaction accounts	485,971
Interest bearing transaction accounts and savings deposits	869,252
Time deposits	613,345
Total deposits	1,968,568
Securities sold under agreement to repurchase	11,256
Other borrowings	347,000
Subordinated debentures	46,393
Accrued interest and other liabilities	17,440
Total liabilities assumed	2,390,657
Equity	295,832
Total liabilities and equity assumed	2,686,489
Goodwill	13,545
OKSB Merger [Member] | Cost Acquired [Member] | Core Deposit Premium [Member]
Intangibles	1,933
OKSB Merger [Member] | Cost Acquired [Member] | Other Intangible Assets [Member]
Intangibles	3,806
OKSB Merger [Member] | Fair Value Adjustments [Member]
Cash and due from banks
Investment securities	(1,295)
Loans acquired	(43,071)
Allowance for loan losses	26,957
Foreclosed assets	(1,127)
Premises and equipment	5,457
Bank owned life insurance
Goodwill, Ending Balance	(13,545)
Other assets	(9,141)
Total assets acquired	4,426
Non-interest bearing transaction accounts
Interest bearing transaction accounts and savings deposits
Time deposits	(2,213)
Total deposits	(2,213)
Securities sold under agreement to repurchase
Other borrowings
Subordinated debentures
Accrued interest and other liabilities	5,364
Total liabilities assumed	3,151
Equity	(295,832)
Total liabilities and equity assumed	(292,681)
Goodwill	(13,545)
OKSB Merger [Member] | Fair Value Adjustments [Member] | Core Deposit Premium [Member]
Intangibles	40,191
OKSB Merger [Member] | Fair Value Adjustments [Member] | Other Intangible Assets [Member]
Intangibles
Hardeman County Investment Company, Inc. [Member]
Cash and due from banks		$ 8,001
Investment securities		170,369
Loans acquired		251,649
Foreclosed assets		631
Premises and equipment		11,163
Bank owned life insurance		7,819
Goodwill, Ending Balance		29,371
Other assets		2,638
Total assets acquired		462,924
Non-interest bearing transaction accounts		76,555
Interest bearing transaction accounts and savings deposits		214,872
Time deposits		97,549
Total deposits		388,976
Securities sold under agreement to repurchase		17,163
Other borrowings		3,000
Subordinated debentures		6,702
Accrued interest and other liabilities		3,815
Total liabilities assumed		419,656
Equity
Total liabilities and equity assumed		419,656
Net assets acquired		43,268
Purchase price		72,639
Goodwill		29,371
Interest bearing balances due from banks - time		1,984
Hardeman County Investment Company, Inc. [Member] | Core Deposit Premium [Member]
Intangibles		7,840
Hardeman County Investment Company, Inc. [Member] | Other Intangible Assets [Member]
Intangibles		830
Hardeman County Investment Company, Inc. [Member] | Cost Acquired [Member]
Cash and due from banks		8,001
Investment securities		170,654
Loans acquired		257,641
Allowance for loan losses		(2,382)
Foreclosed assets		1,083
Premises and equipment		9,905
Bank owned life insurance		7,819
Goodwill, Ending Balance		11,485
Other assets		2,639
Total assets acquired		468,829
Non-interest bearing transaction accounts		76,555
Interest bearing transaction accounts and savings deposits		214,872
Time deposits		97,917
Total deposits		389,344
Securities sold under agreement to repurchase		17,163
Other borrowings		3,000
Subordinated debentures		6,702
Accrued interest and other liabilities		1,891
Total liabilities assumed		418,100
Equity		50,729
Total liabilities and equity assumed		468,829
Goodwill		11,485
Interest bearing balances due from banks - time		1,984
Hardeman County Investment Company, Inc. [Member] | Fair Value Adjustments [Member]
Cash and due from banks
Investment securities		(285)
Loans acquired		(5,992)
Allowance for loan losses		2,382
Foreclosed assets		(452)
Premises and equipment		1,258
Goodwill, Ending Balance		(11,485)
Other assets		(1)
Total assets acquired		(5,905)
Non-interest bearing transaction accounts
Interest bearing transaction accounts and savings deposits
Time deposits		(368)
Total deposits		(368)
Securities sold under agreement to repurchase
Other borrowings
Subordinated debentures
Accrued interest and other liabilities		1,924
Total liabilities assumed		1,556
Equity		(50,729)
Total liabilities and equity assumed		(49,173)
Goodwill		(11,485)
Interest bearing balances due from banks - time
Hardeman County Investment Company, Inc. [Member] | Fair Value Adjustments [Member] | Core Deposit Premium [Member]
Intangibles		7,840
Hardeman County Investment Company, Inc. [Member] | Fair Value Adjustments [Member] | Other Intangible Assets [Member]
Intangibles		$ 830
First Texas Merger [Member]
Cash and due from banks	59,277
Investment securities	80,518
Loans acquired	2,208,378
Allowance for loan losses	(200)
Premises and equipment	34,987
Bank owned life insurance	7,190
Goodwill, Ending Balance	240,843
Other assets	29,748
Total assets acquired	2,427,226
Non-interest bearing transaction accounts	74,410
Interest bearing transaction accounts and savings deposits	1,683,298
Time deposits	123,950
Total deposits	1,881,658
Securities sold under agreement to repurchase	50,000
Other borrowings	235,000
Subordinated debentures	30,912
Accrued interest and other liabilities	13,396
Total liabilities assumed	2,210,966
Equity
Total liabilities and equity assumed	2,210,966
Net assets acquired	216,260
Purchase price	457,103
Goodwill	240,843
First Texas Merger [Member] | Core Deposit Premium [Member]
Intangibles	7,328
First Texas Merger [Member] | Cost Acquired [Member]
Cash and due from banks	59,277
Investment securities	81,114
Loans acquired	2,246,212
Allowance for loan losses	(20,864)
Premises and equipment	24,864
Bank owned life insurance	7,190
Goodwill, Ending Balance	37,227
Other assets	18,263
Total assets acquired	2,453,283
Non-interest bearing transaction accounts	74,410
Interest bearing transaction accounts and savings deposits	1,683,298
Time deposits	124,233
Total deposits	1,881,941
Securities sold under agreement to repurchase	50,000
Other borrowings	235,000
Subordinated debentures	30,323
Accrued interest and other liabilities	11,727
Total liabilities assumed	2,208,991
Equity	244,292
Total liabilities and equity assumed	2,453,283
Goodwill	37,227
First Texas Merger [Member] | Cost Acquired [Member] | Core Deposit Premium [Member]
Intangibles
First Texas Merger [Member] | Fair Value Adjustments [Member]
Cash and due from banks
Investment securities	(596)
Loans acquired	(37,834)
Allowance for loan losses	20,664
Premises and equipment	10,123
Bank owned life insurance
Goodwill, Ending Balance	(37,227)
Other assets	11,485
Total assets acquired	(26,057)
Non-interest bearing transaction accounts
Interest bearing transaction accounts and savings deposits
Time deposits	(283)
Total deposits	(283)
Securities sold under agreement to repurchase
Other borrowings
Subordinated debentures	589
Accrued interest and other liabilities	1,669
Total liabilities assumed	1,975
Equity	(244,292)
Total liabilities and equity assumed	(242,317)
Goodwill	(37,227)
First Texas Merger [Member] | Fair Value Adjustments [Member] | Core Deposit Premium [Member]
Intangibles	$ 7,328

Note 2 - Acquisitions - Summary

Note 2 - Acquisitions - Summary of Unaudited Pro Forma Information (Details) - OKSB and First Texas Acquisitions [Member] - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Revenue (1)	[1]	$ 654,358	$ 620,461
Net income		$ 130,947	$ 136,199
Diluted earnings per share (in dollars per share)		$ 1.43	$ 1.52
[1]	Net interest income plus noninterest income.

Note 3 - Investment Securitie48

Note 3 - Investment Securities (Details Textual) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Securities Continuous Unrealized Loss Position, Fair Value	$ 1,800,000,000		$ 1,400,000,000
Securities Continuous Unrealized Loss Position Fair Value Percent of Portfolio	82.10%		73.50%
Debt Securities, Available-for-sale, Restricted	$ 1,400,000,000		$ 1,200,000,000
Debt Securities, Available-for-sale, Realized Gain	6,000	$ 63,000
Debt Securities, Available-for-sale, Realized Loss	$ 0	$ 0

Note 3 - Investment Securitie49

Note 3 - Investment Securities - Summary of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Held-to-Maturity
Amortized Cost	$ 352,756	$ 368,058
Gross Unrealized Gains	3,702	5,977
Gross Unrealized Losses	(1,809)	(737)
Estimated Fair Value	354,649	373,298
Available-for-Sale
Amortized Cost	1,874,922	1,612,324
Gross Unrealized Gains	1,602	2,100
Gross Unrealized Losses	(46,411)	(24,907)
Estimated Fair Value	1,830,113	1,589,517
US Government Agencies Debt Securities [Member]
Held-to-Maturity
Amortized Cost	46,961	46,945
Gross Unrealized Gains	1	7
Gross Unrealized Losses	(259)	(228)
Estimated Fair Value	46,703	46,724
Available-for-Sale
Amortized Cost	152,855	141,559
Gross Unrealized Gains	15	116
Gross Unrealized Losses	(3,066)	(1,951)
Estimated Fair Value	149,804	139,724
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Held-to-Maturity
Amortized Cost	15,404	16,132
Gross Unrealized Gains		8
Gross Unrealized Losses	(444)	(287)
Estimated Fair Value	14,960	15,853
Available-for-Sale
Amortized Cost	1,394,138	1,208,017
Gross Unrealized Gains	155	246
Gross Unrealized Losses	(38,114)	(20,946)
Estimated Fair Value	1,356,179	1,187,317
US States and Political Subdivisions Debt Securities [Member]
Held-to-Maturity
Amortized Cost	286,901	301,491
Gross Unrealized Gains	3,701	5,962
Gross Unrealized Losses	(1,106)	(222)
Estimated Fair Value	289,496	307,231
Available-for-Sale
Amortized Cost	191,018	144,642
Gross Unrealized Gains	100	532
Gross Unrealized Losses	(5,230)	(2,009)
Estimated Fair Value	185,888	143,165
Other Securities [Member]
Held-to-Maturity
Amortized Cost	3,490	3,490
Gross Unrealized Gains
Gross Unrealized Losses
Estimated Fair Value	3,490	3,490
Available-for-Sale
Amortized Cost	136,911	118,106
Gross Unrealized Gains	1,332	1,206
Gross Unrealized Losses	(1)	(1)
Estimated Fair Value	$ 138,242	$ 119,311

Note 3 - Investment Securitie50

Note 3 - Investment Securities - Securities With Unrealized Losses (Details) $ in Thousands	Mar. 31, 2018USD ($)
Held-to-Maturity
Held-to-maturity, less than 12 months, estimated fair value	$ 119,075
Held-to-maturity, less than 12 months, gross unrealized losses	(1,197)
Held-to-maturity, 12 months or more, estimated fair value	42,832
Held-to-maturity, 12 months or more, gross unrealized losses	(612)
Held-to-maturity, total, estimated fair value	161,907
Held-to-maturity, total, gross unrealized losses	(1,809)
Available-for-Sale
Available-for-sale, less than 12 months, estimated fair value	941,277
Available-for-sale, less than 12 months, gross unrealized losses	(16,170)
Available-for-sale, 12 months or more, estimated fair value	688,261
Available-for-sale, 12 months or more, gross unrealized losses	(30,241)
Available-for-sale, total, estimated fair value	1,629,538
Available-for-sale, total, gross unrealized losses	(46,411)
US Government Agencies Debt Securities [Member]
Held-to-Maturity
Held-to-maturity, less than 12 months, estimated fair value	12,957
Held-to-maturity, less than 12 months, gross unrealized losses	(17)
Held-to-maturity, 12 months or more, estimated fair value	32,758
Held-to-maturity, 12 months or more, gross unrealized losses	(242)
Held-to-maturity, total, estimated fair value	45,715
Held-to-maturity, total, gross unrealized losses	(259)
Available-for-Sale
Available-for-sale, less than 12 months, estimated fair value	120,100
Available-for-sale, less than 12 months, gross unrealized losses	(1,617)
Available-for-sale, 12 months or more, estimated fair value	25,326
Available-for-sale, 12 months or more, gross unrealized losses	(1,449)
Available-for-sale, total, estimated fair value	145,426
Available-for-sale, total, gross unrealized losses	(3,066)
Collateralized Mortgage Backed Securities [Member]
Held-to-Maturity
Held-to-maturity, less than 12 months, estimated fair value	5,897
Held-to-maturity, less than 12 months, gross unrealized losses	(110)
Held-to-maturity, 12 months or more, estimated fair value	8,479
Held-to-maturity, 12 months or more, gross unrealized losses	(334)
Held-to-maturity, total, estimated fair value	14,376
Held-to-maturity, total, gross unrealized losses	(444)
Available-for-Sale
Available-for-sale, less than 12 months, estimated fair value	725,518
Available-for-sale, less than 12 months, gross unrealized losses	(12,950)
Available-for-sale, 12 months or more, estimated fair value	589,543
Available-for-sale, 12 months or more, gross unrealized losses	(25,164)
Available-for-sale, total, estimated fair value	1,315,061
Available-for-sale, total, gross unrealized losses	(38,114)
US States and Political Subdivisions Debt Securities [Member]
Held-to-Maturity
Held-to-maturity, less than 12 months, estimated fair value	100,221
Held-to-maturity, less than 12 months, gross unrealized losses	(1,070)
Held-to-maturity, 12 months or more, estimated fair value	1,595
Held-to-maturity, 12 months or more, gross unrealized losses	(36)
Held-to-maturity, total, estimated fair value	101,816
Held-to-maturity, total, gross unrealized losses	(1,106)
Available-for-Sale
Available-for-sale, less than 12 months, estimated fair value	95,659
Available-for-sale, less than 12 months, gross unrealized losses	(1,603)
Available-for-sale, 12 months or more, estimated fair value	73,293
Available-for-sale, 12 months or more, gross unrealized losses	(3,627)
Available-for-sale, total, estimated fair value	168,952
Available-for-sale, total, gross unrealized losses	(5,230)
Other Securities [Member]
Available-for-Sale
Available-for-sale, less than 12 months, estimated fair value
Available-for-sale, less than 12 months, gross unrealized losses
Available-for-sale, 12 months or more, estimated fair value	99
Available-for-sale, 12 months or more, gross unrealized losses	(1)
Available-for-sale, total, estimated fair value	99
Available-for-sale, total, gross unrealized losses	$ (1)

Note 3 - Investment Securitie51

Note 3 - Investment Securities - Income Earned on Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Non-taxable:
Total	$ 12,622	$ 9,451
Held-to-maturity Securities [Member]
Taxable:
Taxable	567	661
Non-taxable:
Non-taxable	1,936	2,283
Available-for-sale Securities [Member]
Taxable:
Taxable	9,032	5,816
Non-taxable:
Non-taxable	$ 1,087	$ 691

Note 3 - Investment Securitie52

Note 3 - Investment Securities - Maturities of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Held-to-maturity, amortized cost, one year or less	$ 48,493
Held-to-maturity, fair value, one year or less	48,335
Available-for-sale, amortized cost, one year or less	370
Available-for-sale, fair value, one year or less	370
Held-to-maturity, amortized cost, after one through five years	75,993
Held-to-maturity, fair value, after one through five years	75,842
Available-for-sale, amortized cost, after one through five years	35,843
Available-for-sale, fair value, after one through five years	35,100
Held-to-maturity, amortized cost, after five through ten years	92,585
Held-to-maturity, fair value, after five through ten years	92,633
Available-for-sale, amortized cost, after five through ten years	22,926
Available-for-sale, fair value, after five through ten years	22,342
Held-to-maturity, amortized cost, after ten years	120,281
Held-to-maturity, fair value, after ten years	122,879
Available-for-sale, amortized cost, after ten years	284,834
Available-for-sale, fair value, after ten years	277,981
Held-to-maturity, amortized cost, securities not due on a single maturity date	15,404
Held-to-maturity, fair value, securities not due on a single maturity date	14,960
Available-for-sale, amortized cost, securities not due on a single maturity date	1,394,138
Available-for-sale, fair value, securities not due on a single maturity date	1,356,179
Available-for-sale, amortized cost, other securities (no maturity)	136,811
Available-for-sale, fair value, other securities (no maturity)	138,141
Held-to-maturity, amortized cost, total	352,756	$ 368,058
Held-to-maturity, fair value, total	354,649	373,298
Available-for-sale, amortized cost, total	1,874,922	1,612,324
Available-for-sale, fair value, total	$ 1,830,113	$ 1,589,517

Note 4 - Other Assets and Oth53

Note 4 - Other Assets and Other Liabilities Held for Sale (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Other Assets Held-for-sale	$ 24,784	$ 165,780
Other Liabilities Held-for-sale	2,781	$ 157,366
Heartland [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Branches and Loans	141,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits and Other Liabilities	$ 154,600

Note 5 - Loans and Allowance 54

Note 5 - Loans and Allowance for Loan Losses (Details Textual)	3 Months Ended		12 Months Ended
	Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2017USD ($)
Loans and Leases Receivable, Gross, Total	$ 10,990,000,000		$ 10,780,000,000
Impaired Financing Receivable, Recorded Investment, Total	47,269,000		43,923,000
Impaired Financing Receivable, Related Allowance	444,000		338,000
Impaired Financing Receivable, Interest Income, Accrual Method, Total	350,000		325,000
Impaired Financing Receivable, Average Recorded Investment, Total	$ 45,596,000		50,541,000
Financing Receivable, Modifications, Number of Contracts	2	8
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 152,000	$ 8,588,000
Financing Receivable, Specific Reserve		26,000
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans		33,000
Mortgage Loans in Process of Foreclosure, Amount	6,809,000		5,057,000
Real Estate Acquired Through Foreclosure	29,140,000		32,118,000
Loans and Leases Receivable Classified	78,700,000		76,300,000
Provision for Loan and Lease Losses, Total	9,150,000	4,307,000
Loans and Leases Receivable, Allowance, Ending Balance	47,207,000		41,668,000
Risk Ratings 6,7, and 8 [Member]
Loans and Leases Receivable Classified	177,800,000		175,600,000
Substandard [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	17,600,000		17,100,000
OREO Secured by Residential Real Estate Properties [Member]
Real Estate Acquired Through Foreclosure	3,767,000		3,828,000
Acquired Loans [Member]
Loans and Leases Receivable, Gross, Total	4,696,945,000		5,074,076,000
Provision for Loan and Lease Losses, Total	68,000	750,000
Allowance for Loan and Lease Losses, Write-offs	79,000	1,300,000
Loans and Leases Receivable, Allowance, Covered	407,000	435,000	418,000
Loans, Including Acquired Loans [Member]
Loans and Leases Receivable, Allowance, Ending Balance	47,614,000	38,300,000	42,086,000
OREO Received in Full or Partial Satisfaction of Loans [Member] | Commercial Real Estate and Residential Real Estate [Member]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	294,300	$ 242,300
Commercial Real Estate Portfolio Segment [Member]
Loans and Leases Receivable, Gross, Total	4,590,899,000		4,239,612,000
Impaired Financing Receivable, Recorded Investment, Total	32,246,000		31,538,000
Impaired Financing Receivable, Related Allowance	426,000		338,000
Impaired Financing Receivable, Interest Income, Accrual Method, Total	236,000		224,000
Impaired Financing Receivable, Average Recorded Investment, Total	$ 31,892,000		35,062,000
Financing Receivable, Modifications, Number of Contracts	1	3
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 61,000	$ 7,818,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 66,300
Real Estate Owned, Transfer to Real Estate Owned	294,300
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member]
Loans and Leases Receivable, Gross, Total	3,759,251,000		3,818,037,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Loans and Leases Receivable, Gross, Total	1,193,464,000		1,094,633,000
Impaired Financing Receivable, Recorded Investment, Total	13,616,000		13,431,000
Impaired Financing Receivable, Related Allowance	32,000		53,000
Impaired Financing Receivable, Interest Income, Accrual Method, Total	100,000		81,000
Impaired Financing Receivable, Average Recorded Investment, Total	$ 13,523,000		12,667,000
Financing Receivable, Modifications, Number of Contracts	1
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 61,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts		1
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Acquired Loans [Member]
Loans and Leases Receivable, Gross, Total	$ 747,597,000		$ 793,228,000

Note 5 - Loans and Allowance 55

Note 5 - Loans and Allowance for Loan Losses - Loan Portfolio by Categories (Details) - USD ($)		Mar. 31, 2018	Dec. 31, 2017
Loans		$ 10,990,000,000	$ 10,780,000,000
Loans acquired, net of discount and allowance	[1]	4,696,945,000	5,074,076,000
Total loans		10,987,328,000	10,779,685,000
Loans, Excluding Acquired Loans [Member]
Loans		6,290,383,000	5,705,609,000
Consumer Portfolio Segment [Member]
Loans		460,887,000	465,516,000
Consumer Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]
Loans		460,887,000	465,516,000
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Loans		176,602,000	185,422,000
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Loans, Excluding Acquired Loans [Member]
Loans		176,602,000	185,422,000
Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans		284,285,000	280,094,000
Consumer Portfolio Segment [Member] | Other Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans		284,285,000	280,094,000
Commercial Real Estate Portfolio Segment [Member]
Loans		4,590,899,000	4,239,612,000
Commercial Real Estate Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]
Loans		4,590,899,000	4,239,612,000
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans		786,077,000	614,155,000
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans		786,077,000	614,155,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Loans		1,193,464,000	1,094,633,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans		1,193,464,000	1,094,633,000
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member]
Loans		2,611,358,000	2,530,824,000
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans		2,611,358,000	2,530,824,000
Commercial Portfolio Segment [Member]
Loans		1,099,951,000	973,519,000
Commercial Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]
Loans		1,099,951,000	973,519,000
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Loans		971,704,000	825,217,000
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans		971,704,000	825,217,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Loans		128,247,000	148,302,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans		128,247,000	148,302,000
Unallocated Financing Receivables [Member]
Loans		138,646,000	26,962,000
Unallocated Financing Receivables [Member] | Loans, Excluding Acquired Loans [Member]
Loans		$ 138,646,000	$ 26,962,000
[1]	See Note 6, Loans Acquired, for segregation of loans acquired by loan class.

Note 5 - Loans and Allowance 56

Note 5 - Loans and Allowance for Loan Losses - Nonaccrual Loans, Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Loans in nonaccrual status	$ 47,395	$ 45,642
Consumer Portfolio Segment [Member]
Loans in nonaccrual status	5,009	4,775
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Loans in nonaccrual status	298	170
Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans in nonaccrual status	4,711	4,605
Commercial Real Estate Portfolio Segment [Member]
Loans in nonaccrual status	32,246	31,727
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans in nonaccrual status	1,923	2,242
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Loans in nonaccrual status	13,616	13,431
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member]
Loans in nonaccrual status	16,707	16,054
Commercial Portfolio Segment [Member]
Loans in nonaccrual status	10,140	9,140
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Loans in nonaccrual status	8,003	6,980
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Loans in nonaccrual status	$ 2,137	$ 2,160

Note 5 - Loans and Allowance 57

Note 5 - Loans and Allowance for Loan Losses - Age Analysis of Past Due Loans, Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Loans	$ 10,990,000,000	$ 10,780,000,000
Loans, Excluding Acquired Loans [Member]
Past Due	46,679,000	46,075,000
Current	6,243,704,000	5,659,534,000
Loans	6,290,383,000	5,705,609,000
90 Days Past Due & Accruing	337,000	343,000
Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	20,268,000	18,159,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	26,411,000	27,916,000
Consumer Portfolio Segment [Member]
Loans	460,887,000	465,516,000
Consumer Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	7,962,000	9,686,000
Current	452,925,000	455,830,000
Loans	460,887,000	465,516,000
90 Days Past Due & Accruing	266,000	342,000
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	4,114,000	5,716,000
Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	3,848,000	3,970,000
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Loans	176,602,000	185,422,000
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	1,379,000	1,379,000
Current	175,223,000	184,043,000
Loans	176,602,000	185,422,000
90 Days Past Due & Accruing	233,000	332,000
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	707,000	707,000
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	672,000	672,000
Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans	284,285,000	280,094,000
Consumer Portfolio Segment [Member] | Other Loans [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	6,583,000	8,307,000
Current	277,702,000	271,787,000
Loans	284,285,000	280,094,000
90 Days Past Due & Accruing	33,000	10,000
Consumer Portfolio Segment [Member] | Other Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	3,407,000	5,009,000
Consumer Portfolio Segment [Member] | Other Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	3,176,000	3,298,000
Commercial Real Estate Portfolio Segment [Member]
Loans	4,590,899,000	4,239,612,000
Commercial Real Estate Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	28,727,000	26,571,000
Current	4,562,172,000	4,213,041,000
Loans	4,590,899,000	4,239,612,000
90 Days Past Due & Accruing	71,000	1,000
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	12,373,000	10,870,000
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	16,354,000	15,701,000
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans	786,077,000	614,155,000
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	1,343,000	1,621,000
Current	784,734,000	612,534,000
Loans	786,077,000	614,155,000
90 Days Past Due & Accruing
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	640,000	411,000
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	703,000	1,210,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Loans	1,193,464,000	1,094,633,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	13,100,000	14,531,000
Current	1,180,364,000	1,080,102,000
Loans	1,193,464,000	1,094,633,000
90 Days Past Due & Accruing	71,000	1,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	6,937,000	8,071,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	6,163,000	6,460,000
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member]
Loans	2,611,358,000	2,530,824,000
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	14,284,000	10,419,000
Current	2,597,074,000	2,520,405,000
Loans	2,611,358,000	2,530,824,000
90 Days Past Due & Accruing
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	4,796,000	2,388,000
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	9,488,000	8,031,000
Commercial Portfolio Segment [Member]
Loans	1,099,951,000	973,519,000
Commercial Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	9,990,000	9,818,000
Current	1,089,961,000	963,701,000
Loans	1,099,951,000	973,519,000
90 Days Past Due & Accruing
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	3,781,000	1,573,000
Commercial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	6,209,000	8,245,000
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Loans	971,704,000	825,217,000
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	7,808,000	7,648,000
Current	963,896,000	817,569,000
Loans	971,704,000	825,217,000
90 Days Past Due & Accruing
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	3,674,000	1,523,000
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	4,134,000	6,125,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Loans	128,247,000	148,302,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	2,182,000	2,170,000
Current	126,065,000	146,132,000
Loans	128,247,000	148,302,000
90 Days Past Due & Accruing
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	107,000	50,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	2,075,000	2,120,000
Unallocated Financing Receivables [Member]
Loans	138,646,000	26,962,000
Unallocated Financing Receivables [Member] | Loans, Excluding Acquired Loans [Member]
Past Due
Current	138,646,000	26,962,000
Loans	138,646,000	26,962,000
90 Days Past Due & Accruing
Unallocated Financing Receivables [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due
Unallocated Financing Receivables [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due

Note 5 - Loans and Allowance 58

Note 5 - Loans and Allowance for Loan Losses - Impaired Loans, Net of Government Guarantees and Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Unpaid Contractual Principal Balance	$ 56,380,000	$ 57,334,000
Recorded Investment With No Allowance	36,677,000	30,920,000
Recorded Investment With Allowance	10,592,000	13,003,000
Impaired Financing Receivable, Recorded Investment, Total	47,269,000	43,923,000
Impaired Financing Receivable, Related Allowance	444,000	338,000
Average Investment in Impaired Loans	45,596,000	50,541,000
Interest Income Recognized	350,000	325,000
Consumer Portfolio Segment [Member]
Unpaid Contractual Principal Balance	5,147,000	4,925,000
Recorded Investment With No Allowance	5,009,000	4,775,000
Recorded Investment With Allowance
Impaired Financing Receivable, Recorded Investment, Total	5,009,000	4,775,000
Impaired Financing Receivable, Related Allowance
Average Investment in Impaired Loans	4,892,000	2,409,000
Interest Income Recognized	49,000	18,000
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Unpaid Contractual Principal Balance	298,000	170,000
Recorded Investment With No Allowance	298,000	170,000
Recorded Investment With Allowance
Impaired Financing Receivable, Recorded Investment, Total	298,000	170,000
Impaired Financing Receivable, Related Allowance
Average Investment in Impaired Loans	234,000	302,000
Interest Income Recognized	15,000	5,000
Consumer Portfolio Segment [Member] | Other Loans [Member]
Unpaid Contractual Principal Balance	4,849,000	4,755,000
Recorded Investment With No Allowance	4,711,000	4,605,000
Recorded Investment With Allowance
Impaired Financing Receivable, Recorded Investment, Total	4,711,000	4,605,000
Impaired Financing Receivable, Related Allowance
Average Investment in Impaired Loans	4,658,000	2,107,000
Interest Income Recognized	34,000	13,000
Commercial Real Estate Portfolio Segment [Member]
Unpaid Contractual Principal Balance	39,497,000	39,177,000
Recorded Investment With No Allowance	22,412,000	20,804,000
Recorded Investment With Allowance	9,834,000	10,734,000
Impaired Financing Receivable, Recorded Investment, Total	32,246,000	31,538,000
Impaired Financing Receivable, Related Allowance	426,000	338,000
Average Investment in Impaired Loans	31,892,000	35,062,000
Interest Income Recognized	236,000	224,000
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Unpaid Contractual Principal Balance	2,392,000	2,522,000
Recorded Investment With No Allowance	1,220,000	1,347,000
Recorded Investment With Allowance	702,000	895,000
Impaired Financing Receivable, Recorded Investment, Total	1,922,000	2,242,000
Impaired Financing Receivable, Related Allowance	249,000	249,000
Average Investment in Impaired Loans	2,082,000	3,074,000
Interest Income Recognized	16,000	20,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Unpaid Contractual Principal Balance	14,605,000	14,347,000
Recorded Investment With No Allowance	13,057,000	12,725,000
Recorded Investment With Allowance	559,000	706,000
Impaired Financing Receivable, Recorded Investment, Total	13,616,000	13,431,000
Impaired Financing Receivable, Related Allowance	32,000	53,000
Average Investment in Impaired Loans	13,523,000	12,667,000
Interest Income Recognized	100,000	81,000
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member]
Unpaid Contractual Principal Balance	22,500,000	22,308,000
Recorded Investment With No Allowance	8,135,000	6,732,000
Recorded Investment With Allowance	8,573,000	9,133,000
Impaired Financing Receivable, Recorded Investment, Total	16,708,000	15,865,000
Impaired Financing Receivable, Related Allowance	145,000	36,000
Average Investment in Impaired Loans	16,287,000	19,321,000
Interest Income Recognized	120,000	123,000
Commercial Portfolio Segment [Member]
Unpaid Contractual Principal Balance	11,736,000	13,232,000
Recorded Investment With No Allowance	9,256,000	5,341,000
Recorded Investment With Allowance	758,000	2,269,000
Impaired Financing Receivable, Recorded Investment, Total	10,014,000	7,610,000
Impaired Financing Receivable, Related Allowance	18,000
Average Investment in Impaired Loans	8,812,000	13,070,000
Interest Income Recognized	65,000	83,000
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Unpaid Contractual Principal Balance	8,480,000	9,954,000
Recorded Investment With No Allowance	7,119,000	4,306,000
Recorded Investment With Allowance	758,000	2,269,000
Impaired Financing Receivable, Recorded Investment, Total	7,877,000	6,575,000
Impaired Financing Receivable, Related Allowance	18,000
Average Investment in Impaired Loans	7,226,000	11,344,000
Interest Income Recognized	53,000	72,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Unpaid Contractual Principal Balance	3,256,000	3,278,000
Recorded Investment With No Allowance	2,137,000	1,035,000
Recorded Investment With Allowance
Impaired Financing Receivable, Recorded Investment, Total	2,137,000	1,035,000
Impaired Financing Receivable, Related Allowance
Average Investment in Impaired Loans	1,586,000	1,726,000
Interest Income Recognized	$ 12,000	$ 11,000

Note 5 - Loans and Allowance 59

Note 5 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings, Excluding Loans Acquired, Segregated by Class of Loans (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018USD ($)	Mar. 31, 2017	Dec. 31, 2017USD ($)
Troubled debt, number	2	8
Consumer Portfolio Segment [Member]
Troubled debt, number	1
Consumer Portfolio Segment [Member] | Other Loans [Member]
Troubled debt, number	1
Commercial Real Estate Portfolio Segment [Member]
Troubled debt, number	1	3
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Troubled debt, number		1
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Troubled debt, number	1
Commercial Real Estate Portfolio Segment [Member] | Commercial Loans [Member]
Troubled debt, number		5
Commercial Portfolio Segment [Member]
Troubled debt, number		5
Loans, Excluding Acquired Loans [Member]
Troubled debt, number	38		40
Troubled debt, balance	$ 11,757		$ 12,938
Loans, Excluding Acquired Loans [Member] | Consumer Portfolio Segment [Member]
Troubled debt, number	1
Troubled debt, balance	$ 91
Loans, Excluding Acquired Loans [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Troubled debt, number	1
Troubled debt, balance	$ 91
Loans, Excluding Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Troubled debt, number	27		29
Troubled debt, balance	$ 9,031		$ 9,549
Loans, Excluding Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Loans [Member]
Troubled debt, number	8		9
Troubled debt, balance	$ 7,620		$ 8,034
Loans, Excluding Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Troubled debt, number	1		1
Troubled debt, balance	$ 408		$ 420
Loans, Excluding Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Troubled debt, number	18		19
Troubled debt, balance	$ 1,003		$ 1,095
Loans, Excluding Acquired Loans [Member] | Commercial Portfolio Segment [Member]
Troubled debt, number	10		11
Troubled debt, balance	$ 2,635		$ 3,389
Loans, Excluding Acquired Loans [Member] | Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Troubled debt, number	10		11
Troubled debt, balance	$ 2,635		$ 3,389
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member]
Troubled debt, number	14		13
Troubled debt, balance	$ 6,459		$ 7,107
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Troubled debt, number	1
Troubled debt, balance	$ 91
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Troubled debt, number	1
Troubled debt, balance	$ 91
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]
Troubled debt, number	9		8
Troubled debt, balance	$ 4,471		$ 4,463
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Loans [Member]
Troubled debt, number	4		4
Troubled debt, balance	$ 4,270		$ 4,322
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Troubled debt, number
Troubled debt, balance
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Troubled debt, number	5		4
Troubled debt, balance	$ 201		$ 141
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Troubled debt, number	4		5
Troubled debt, balance	$ 1,897		$ 2,644
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Troubled debt, number	4		5
Troubled debt, balance	$ 1,897		$ 2,644
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member]
Troubled debt, number	24		27
Troubled debt, balance	$ 5,298		$ 5,831
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Troubled debt, number
Troubled debt, balance
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Troubled debt, number
Troubled debt, balance
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]
Troubled debt, number	18		21
Troubled debt, balance	$ 4,560		$ 5,086
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Loans [Member]
Troubled debt, number	4		5
Troubled debt, balance	$ 3,350		$ 3,712
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Troubled debt, number	1		1
Troubled debt, balance	$ 408		$ 420
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Troubled debt, number	13		15
Troubled debt, balance	$ 802		$ 954
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Troubled debt, number	6		6
Troubled debt, balance	$ 738		$ 745
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Troubled debt, number	6		6
Troubled debt, balance	$ 738		$ 745

Note 5 - Loans and Allowance 60

Note 5 - Loans and Allowance for Loan Losses - Loans Restructured as TDRs, Excluding Loans Acquired, Segregated by Class of Loans (Details)	3 Months Ended
	Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)
Number of Loans	2	8
Balance Prior to TDR	$ 152,000	$ 8,588,000
Balance	153,000	8,578,000
Financial Impact on Date of Restructure		33,000
Extended Maturity [Member]
Balance	153,000	8,578,000
Contractual Interest Rate Reduction [Member]
Balance
Consumer Portfolio Segment [Member]
Number of Loans	1
Balance Prior to TDR	$ 91,000
Balance	91,000
Financial Impact on Date of Restructure
Consumer Portfolio Segment [Member] | Extended Maturity [Member]
Balance	91,000
Consumer Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Balance
Consumer Portfolio Segment [Member] | Other Loans [Member]
Number of Loans	1
Balance Prior to TDR	$ 91,000
Balance	91,000
Financial Impact on Date of Restructure
Consumer Portfolio Segment [Member] | Other Loans [Member] | Extended Maturity [Member]
Balance	91,000
Consumer Portfolio Segment [Member] | Other Loans [Member] | Contractual Interest Rate Reduction [Member]
Balance
Commercial Real Estate Portfolio Segment [Member]
Number of Loans	1	3
Balance Prior to TDR	$ 61,000	$ 7,818,000
Balance	62,000	7,818,000
Financial Impact on Date of Restructure		33,000
Commercial Real Estate Portfolio Segment [Member] | Extended Maturity [Member]
Balance	62,000	7,818,000
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Balance
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Number of Loans	1
Balance Prior to TDR	$ 61,000
Balance	62,000
Financial Impact on Date of Restructure
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Extended Maturity [Member]
Balance	62,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Contractual Interest Rate Reduction [Member]
Balance
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Number of Loans		1
Balance Prior to TDR		$ 456,000
Balance		456,000
Financial Impact on Date of Restructure
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Extended Maturity [Member]
Balance		456,000
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Contractual Interest Rate Reduction [Member]
Balance
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member]
Number of Loans		2
Balance Prior to TDR		$ 7,362,000
Balance		7,362,000
Financial Impact on Date of Restructure		33,000
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Extended Maturity [Member]
Balance		7,362,000
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Contractual Interest Rate Reduction [Member]
Balance
Commercial Real Estate Portfolio Segment [Member] | Commercial Loans [Member]
Number of Loans		5
Balance Prior to TDR		$ 770,000
Balance		760,000
Financial Impact on Date of Restructure
Commercial Real Estate Portfolio Segment [Member] | Commercial Loans [Member] | Extended Maturity [Member]
Balance		760,000
Commercial Real Estate Portfolio Segment [Member] | Commercial Loans [Member] | Contractual Interest Rate Reduction [Member]
Balance
Commercial Portfolio Segment [Member]
Number of Loans		5
Balance Prior to TDR		$ 770,000
Balance		760,000
Financial Impact on Date of Restructure
Commercial Portfolio Segment [Member] | Extended Maturity [Member]
Balance		760,000
Commercial Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Balance

Note 5 - Loans and Allowance 61

Note 5 - Loans and Allowance for Loan Losses - Loans by Credit Risk Rating, Segregated by Class of Loans (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Financing Receivables		$ 10,987,328	$ 10,779,685
Loans acquired, net of discount and allowance	[1]	4,696,945	5,074,076
Loans acquired	[1]	4,696,945	5,074,076
Pass [Member]
Financing Receivables		10,737,192	10,302,189
Loans acquired, net of discount and allowance		4,545,941	4,782,384
Loans acquired		4,545,941	4,782,384
Special Mention [Member]
Financing Receivables		72,339	301,922
Loans acquired, net of discount and allowance		54,664	198,314
Loans acquired		54,664	198,314
Substandard [Member]
Financing Receivables		177,038	175,064
Loans acquired, net of discount and allowance		95,842	93,378
Loans acquired		95,842	93,378
Doubtful [Member]
Financing Receivables		759	376
Loans acquired, net of discount and allowance		498
Loans acquired		498
Unlikely to be Collected Financing Receivable [Member]
Financing Receivables			134
Loans acquired, net of discount and allowance
Loans acquired
Consumer Portfolio Segment [Member]
Financing Receivables		460,887	465,516
Consumer Portfolio Segment [Member] | Pass [Member]
Financing Receivables		455,485	460,080
Consumer Portfolio Segment [Member] | Special Mention [Member]
Financing Receivables
Consumer Portfolio Segment [Member] | Substandard [Member]
Financing Receivables		5,402	5,436
Consumer Portfolio Segment [Member] | Doubtful [Member]
Financing Receivables
Consumer Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Financing Receivables		176,602	185,422
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Pass [Member]
Financing Receivables		176,071	184,920
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Special Mention [Member]
Financing Receivables
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Substandard [Member]
Financing Receivables		531	502
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Doubtful [Member]
Financing Receivables
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables
Consumer Portfolio Segment [Member] | Other Loans [Member]
Financing Receivables		284,285	280,094
Consumer Portfolio Segment [Member] | Other Loans [Member] | Pass [Member]
Financing Receivables		279,414	275,160
Consumer Portfolio Segment [Member] | Other Loans [Member] | Special Mention [Member]
Financing Receivables
Consumer Portfolio Segment [Member] | Other Loans [Member] | Substandard [Member]
Financing Receivables		4,871	4,934
Consumer Portfolio Segment [Member] | Other Loans [Member] | Doubtful [Member]
Financing Receivables
Consumer Portfolio Segment [Member] | Other Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables
Commercial Real Estate Portfolio Segment [Member]
Financing Receivables		4,590,899	4,239,612
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Financing Receivables		4,519,044	4,150,321
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Financing Receivables		11,210	29,330
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Financing Receivables		60,407	59,658
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Financing Receivables		238	303
Commercial Real Estate Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivables		786,077	614,155
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Financing Receivables		778,757	603,126
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Financing Receivables		2,344	5,795
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]
Financing Receivables		4,960	5,218
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Doubtful [Member]
Financing Receivables		16	16
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Financing Receivables		1,193,464	1,094,633
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Pass [Member]
Financing Receivables		1,168,255	1,066,902
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Special Mention [Member]
Financing Receivables		1,790	3,954
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Substandard [Member]
Financing Receivables		23,197	23,490
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Doubtful [Member]
Financing Receivables		222	287
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member]
Financing Receivables		2,611,358	2,530,824
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Pass [Member]
Financing Receivables		2,572,032	2,480,293
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Special Mention [Member]
Financing Receivables		7,076	19,581
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Substandard [Member]
Financing Receivables		32,250	30,950
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Doubtful [Member]
Financing Receivables
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables
Commercial Portfolio Segment [Member]
Financing Receivables		1,099,951	973,519
Commercial Portfolio Segment [Member] | Pass [Member]
Financing Receivables		1,078,076	882,442
Commercial Portfolio Segment [Member] | Special Mention [Member]
Financing Receivables		6,465	74,278
Commercial Portfolio Segment [Member] | Substandard [Member]
Financing Receivables		15,387	16,592
Commercial Portfolio Segment [Member] | Doubtful [Member]
Financing Receivables		23	73
Commercial Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables			134
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Financing Receivables		971,704	825,217
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Pass [Member]
Financing Receivables		953,138	736,377
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Special Mention [Member]
Financing Receivables		6,140	74,254
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Substandard [Member]
Financing Receivables		12,426	14,402
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Doubtful [Member]
Financing Receivables			50
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables			134
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Financing Receivables		128,247	148,302
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Pass [Member]
Financing Receivables		124,938	146,065
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Special Mention [Member]
Financing Receivables		325	24
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Substandard [Member]
Financing Receivables		2,961	2,190
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Doubtful [Member]
Financing Receivables		23	23
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables
Unallocated Financing Receivables [Member]
Financing Receivables		138,646	26,962
Unallocated Financing Receivables [Member] | Pass [Member]
Financing Receivables		138,646	26,962
Unallocated Financing Receivables [Member] | Special Mention [Member]
Financing Receivables
Unallocated Financing Receivables [Member] | Substandard [Member]
Financing Receivables
Unallocated Financing Receivables [Member] | Doubtful [Member]
Financing Receivables
Unallocated Financing Receivables [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables
[1]	See Note 6, Loans Acquired, for segregation of loans acquired by loan class.

Note 5 - Loans and Allowance 62

Note 5 - Loans and Allowance for Loan Losses - Activity in the Allowance for Loan Losses, by Portfolio Segment, for the Current Year (Details) - USD ($)		3 Months Ended
		Mar. 31, 2018		Mar. 31, 2017	Dec. 31, 2017
Balance, beginning of period		$ 41,668,000
Provision for loan losses		9,150,000		$ 4,307,000
Balance, end of year		47,207,000
Loans, Excluding Acquired Loans [Member]
Balance, beginning of period		41,668,000	[1]	36,286,000
Provision for loan losses	[2]	9,082,000		3,557,000
Charge-offs		(4,271,000)		(3,166,000)
Recoveries		728,000		1,188,000
Net charge-offs		(3,543,000)		(1,978,000)
Balance, end of year	[1]	47,207,000		37,865,000
Loans individually evaluated for impairment		444,000		1,546,000	$ 338,000
Loans collectively evaluated for impairment		46,763,000		36,319,000	41,330,000
Loans individually evaluated for impairment		444,000		1,546,000	338,000
Loans collectively evaluated for impairment		46,763,000		36,319,000	41,330,000
Loans, Excluding Acquired Loans [Member] | Commercial Portfolio Segment [Member]
Balance, beginning of period		7,007,000	[1]	7,739,000
Provision for loan losses	[2]	4,286,000		696,000
Charge-offs		(1,761,000)		(292,000)
Recoveries		69,000		30,000
Net charge-offs		(1,692,000)		(262,000)
Balance, end of year	[1]	9,601,000		8,173,000
Loans individually evaluated for impairment		18,000		708,000
Loans collectively evaluated for impairment		9,583,000		7,465,000	7,007,000
Loans individually evaluated for impairment		18,000		708,000
Loans collectively evaluated for impairment		9,583,000		7,465,000	7,007,000
Loans, Excluding Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Balance, beginning of period		27,281,000	[1]	21,817,000
Provision for loan losses	[2]	3,286,000		860,000
Charge-offs		(455,000)		(656,000)
Recoveries		302,000		232,000
Net charge-offs		(153,000)		(424,000)
Balance, end of year	[1]	30,414,000		22,253,000
Loans individually evaluated for impairment		426,000		837,000	338,000
Loans collectively evaluated for impairment		29,988,000		21,416,000	26,943,000
Loans individually evaluated for impairment		426,000		837,000	338,000
Loans collectively evaluated for impairment		29,988,000		21,416,000	26,943,000
Loans, Excluding Acquired Loans [Member] | Consumer Portfolio Segment [Member]
Balance, beginning of period		3,784,000	[1]	3,779,000
Provision for loan losses	[2]	751,000		758,000
Charge-offs		(999,000)		(1,044,000)
Recoveries		263,000		236,000
Net charge-offs		(736,000)		(808,000)
Balance, end of year	[1]	3,799,000		3,729,000
Loans individually evaluated for impairment
Loans collectively evaluated for impairment		3,799,000		3,729,000	3,784,000
Loans individually evaluated for impairment
Loans collectively evaluated for impairment		3,799,000		3,729,000	3,784,000
Loans, Excluding Acquired Loans [Member] | Unallocated Financing Receivables [Member]
Balance, beginning of period		3,596,000	[1]	2,951,000
Provision for loan losses	[2]	759,000		1,243,000
Charge-offs		(1,056,000)		(1,174,000)
Recoveries		94,000		690,000
Net charge-offs		(962,000)		(484,000)
Balance, end of year	[1]	3,393,000		3,710,000
Loans individually evaluated for impairment				1,000
Loans collectively evaluated for impairment		3,393,000		3,709,000	3,596,000
Loans individually evaluated for impairment				1,000
Loans collectively evaluated for impairment		$ 3,393,000		$ 3,709,000	$ 3,596,000
[1]	Allowance for loan losses at March 31, 2018 includes $407,000 allowance for loans acquired (not shown in the table above). Allowance for loan losses at December 31, 2017 and March 31, 2017 includes $418,000 and $435,000, respectively, of allowance for loans acquired (not shown in the table above). The total allowance for loan losses at March 31, 2018 was $47,614,000 and total allowance for loan losses at December 31, 2017 and March 31, 2017 was $42,086,000 and $38,300,000, respectively.
[2]	Provision for loan losses of $68,000 attributable to loans acquired was excluded from this table for the three months ended March 31, 2018 (total provision for loan losses for the three months ended March 31, 2018 was $9,150,000). There were $79,000 in charge-offs for loans acquired during the three months ended March 31, 2018, resulting in an ending balance in the allowance related to loans acquired of $407,000. Provision for loan losses of $750,000 attributable to loans acquired was excluded from this table for the three months ended March 31, 2017 (total provision for loan losses for the three months ended March 31, 2017 was $4,307,000). There were $1.3 million in charge-offs for loans acquired during the first three months of 2017, resulting in an ending balance in the allowance related to loans acquired of $435,000.

Note 5 - Loans and Allowance 63

Note 5 - Loans and Allowance for Loan Losses - Recorded Investment in Loans, Excluding Loans Acquired (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Balance, end of period	$ 10,987,328	$ 10,779,685
Commercial Portfolio Segment [Member]
Balance, end of period	1,099,951	973,519
Commercial Real Estate Portfolio Segment [Member]
Balance, end of period	4,590,899	4,239,612
Consumer Portfolio Segment [Member]
Balance, end of period	460,887	465,516
Unallocated Financing Receivables [Member]
Balance, end of period	138,646	26,962
Loans, Excluding Acquired Loans [Member]
Loans individually evaluated for impairment	47,269	43,923
Loans collectively evaluated for impairment	6,243,114	5,661,686
Balance, end of period	6,290,383	5,705,609
Loans, Excluding Acquired Loans [Member] | Commercial Portfolio Segment [Member]
Loans individually evaluated for impairment	10,014	7,610
Loans collectively evaluated for impairment	1,089,937	965,909
Balance, end of period	1,099,951	973,519
Loans, Excluding Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans individually evaluated for impairment	32,246	31,538
Loans collectively evaluated for impairment	4,558,653	4,208,074
Balance, end of period	4,590,899	4,239,612
Loans, Excluding Acquired Loans [Member] | Consumer Portfolio Segment [Member]
Loans individually evaluated for impairment	298	170
Loans collectively evaluated for impairment	176,304	185,252
Balance, end of period	176,602	185,422
Loans, Excluding Acquired Loans [Member] | Unallocated Financing Receivables [Member]
Loans individually evaluated for impairment	4,711	4,605
Loans collectively evaluated for impairment	418,220	302,451
Balance, end of period	$ 422,931	$ 307,056

Note 6 - Loans Acquired (Detail

Note 6 - Loans Acquired (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Jun. 30, 2017
Non Covered Impaired Loans Allowance Reclassified	$ 407,000
Covered Purchased Impaired Loans Allowance	407,000		$ 418,000
Provision for Loan and Lease Losses, Total	9,150,000	$ 4,307,000
Acquired Loans [Member]
Non Covered Impaired Loans Allowance Reclassified			418,000
Provision for Loan and Lease Losses, Total	$ 68,000	$ 750,000
OKSB Merger [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net			1,985,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross			2,021,000,000
Loans Acquired Discount			36,300,000
OKSB Merger [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net			11,400,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross			18,100,000
Loans Acquired Discount			6,700,000
First Texas Merger [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net			2,208,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross			2,246,000,000
Loans Acquired Discount			$ 37,800,000
Hardeman County Investment Company, Inc. [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net				$ 249,200,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross				254,200,000
Loans Acquired Discount				5,000,000
Hardeman County Investment Company, Inc. [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net				2,400,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross				3,400,000
Loans Acquired Discount				$ 990,000

Note 6 - Loans Acquired - Carry

Note 6 - Loans Acquired - Carrying Value of all Acquired Impaired Loans (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Acquired loans	[1]	$ 4,696,945	$ 5,074,076
Commercial Real Estate Portfolio Segment [Member]
Acquired loans		3,759,251	3,818,037
Commercial Portfolio Segment [Member]
Acquired loans		894,604	1,062,163
Unallocated Financing Receivables [Member]
Acquired loans			142,409
Other Loans [Member] | Consumer Portfolio Segment [Member]
Acquired loans		43,090	51,467
Other Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Acquired loans		2,420,121	2,387,777
Construction Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Acquired loans		591,533	637,032
Single Family Residential Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Acquired loans		747,597	793,228
Commercial Loans [Member] | Commercial Portfolio Segment [Member]
Acquired loans		891,261	995,587
Agricultural Loans [Member] | Commercial Portfolio Segment [Member]
Acquired loans		$ 3,343	$ 66,576
[1]	Loans acquired are reported net of a $407,000 and $418,000 allowance at March 31, 2018 and December 31, 2017, respectively.

Note 6 - Loans Acquired - Nonac

Note 6 - Loans Acquired - Nonaccrual Acquired Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Loans in nonaccrual status	$ 47,395	$ 45,642
Acquired Loans [Member]
Loans in nonaccrual status	30,179	23,485
Consumer Portfolio Segment [Member]
Loans in nonaccrual status	5,009	4,775
Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans in nonaccrual status	4,711	4,605
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member]
Loans in nonaccrual status	570	334
Commercial Real Estate Portfolio Segment [Member]
Loans in nonaccrual status	32,246	31,727
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans in nonaccrual status	1,923	2,242
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Loans in nonaccrual status	13,616	13,431
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member]
Loans in nonaccrual status	16,707	16,054
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member]
Loans in nonaccrual status	27,939	21,319
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member]
Loans in nonaccrual status	241	1,767
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member]
Loans in nonaccrual status	8,072	12,151
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Commercial Loans [Member]
Loans in nonaccrual status	19,626	7,401
Commercial Portfolio Segment [Member]
Loans in nonaccrual status	10,140	9,140
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Loans in nonaccrual status	8,003	6,980
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Loans in nonaccrual status	2,137	2,160
Commercial Portfolio Segment [Member] | Acquired Loans [Member]
Loans in nonaccrual status	1,670	1,832
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member]
Loans in nonaccrual status	1,518	1,748
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member]
Loans in nonaccrual status	$ 152	$ 84

Note 6 - Loans Acquired - Age A

Note 6 - Loans Acquired - Age Analysis of Past Due Acquired Loans, Excluding Loans Covered by Loss Share (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Loans	$ 10,990,000,000	$ 10,780,000,000
Acquired Loans [Member]
Past Due	23,401,000	47,684,000
Current	4,673,544,000	5,026,392,000
Loans	4,696,945,000	5,074,076,000
90 Days Past Due & Accruing		3,145,000
Acquired Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Past Due	11,764,000	35,988,000
Acquired Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due	11,637,000	11,696,000
Consumer Portfolio Segment [Member]
Loans	460,887,000	465,516,000
Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans	284,285,000	280,094,000
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member]
Past Due	596,000	1,149,000
Current	42,494,000	50,318,000
Loans	43,090,000	51,467,000
90 Days Past Due & Accruing		108,000
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Past Due	444,000	889,000
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due	152,000	260,000
Commercial Real Estate Portfolio Segment [Member]
Loans	4,590,899,000	4,239,612,000
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans	786,077,000	614,155,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Loans	1,193,464,000	1,094,633,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member]
Past Due	20,377,000	43,086,000
Current	3,738,874,000	3,774,951,000
Loans	3,759,251,000	3,818,037,000
90 Days Past Due & Accruing		2,970,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Past Due	9,580,000	32,689,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due	10,797,000	10,397,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member]
Past Due	5,420,000	22,823,000
Current	2,414,701,000	2,364,954,000
Loans	2,420,121,000	2,387,777,000
90 Days Past Due & Accruing		2,565,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Past Due	1,480,000	17,176,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due	3,940,000	5,647,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member]
Past Due	1,666,000	4,025,000
Current	589,867,000	633,007,000
Loans	591,533,000	637,032,000
90 Days Past Due & Accruing		279,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Past Due	162,000	2,577,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due	1,504,000	1,448,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member]
Past Due	13,291,000	16,238,000
Current	734,306,000	776,990,000
Loans	747,597,000	793,228,000
90 Days Past Due & Accruing		126,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Past Due	7,938,000	12,936,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due	5,353,000	3,302,000
Commercial Portfolio Segment [Member]
Loans	1,099,951,000	973,519,000
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Loans	971,704,000	825,217,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Loans	128,247,000	148,302,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member]
Past Due	2,428,000	3,434,000
Current	892,176,000	1,058,729,000
Loans	894,604,000	1,062,163,000
90 Days Past Due & Accruing		67,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Past Due	1,740,000	2,395,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due	688,000	1,039,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member]
Past Due	2,266,000	3,383,000
Current	888,995,000	992,204,000
Loans	891,261,000	995,587,000
90 Days Past Due & Accruing		67,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Past Due	1,697,000	2,344,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due	569,000	1,039,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member]
Past Due	162,000	51,000
Current	3,181,000	66,525,000
Loans	3,343,000	66,576,000
90 Days Past Due & Accruing
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Past Due	43,000	51,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due	119,000
Unallocated Financing Receivables [Member]
Loans	$ 138,646,000	26,962,000
Unallocated Financing Receivables [Member] | Acquired Loans [Member]
Past Due		15,000
Current		142,394,000
Loans		142,409,000
90 Days Past Due & Accruing
Unallocated Financing Receivables [Member] | Acquired Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Past Due		15,000
Unallocated Financing Receivables [Member] | Acquired Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due

Note 6 - Loans Acquired - Summa

Note 6 - Loans Acquired - Summary of Acquired Loans, Excluding Loans Covered by Loss Share (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Acquired loans	$ 10,987,328	$ 10,779,685
Pass [Member]
Acquired loans	10,737,192	10,302,189
Special Mention [Member]
Acquired loans	72,339	301,922
Substandard [Member]
Acquired loans	177,038	175,064
Doubtful [Member]
Acquired loans	759	376
Unlikely to be Collected Financing Receivable [Member]
Acquired loans		134
Acquired Loans [Member]
Acquired loans	4,696,945	5,074,076
Acquired Loans [Member] | Pass [Member]
Acquired loans	4,545,941	4,918,570
Acquired Loans [Member] | Special Mention [Member]
Acquired loans	54,664	62,128
Acquired Loans [Member] | Substandard [Member]
Acquired loans	95,842	93,378
Acquired Loans [Member] | Doubtful [Member]
Acquired loans	498
Acquired Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Consumer Portfolio Segment [Member]
Acquired loans	460,887	465,516
Consumer Portfolio Segment [Member] | Pass [Member]
Acquired loans	455,485	460,080
Consumer Portfolio Segment [Member] | Special Mention [Member]
Acquired loans
Consumer Portfolio Segment [Member] | Substandard [Member]
Acquired loans	5,402	5,436
Consumer Portfolio Segment [Member] | Doubtful [Member]
Acquired loans
Consumer Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Consumer Portfolio Segment [Member] | Other Loans [Member]
Acquired loans	284,285	280,094
Consumer Portfolio Segment [Member] | Other Loans [Member] | Pass [Member]
Acquired loans	279,414	275,160
Consumer Portfolio Segment [Member] | Other Loans [Member] | Special Mention [Member]
Acquired loans
Consumer Portfolio Segment [Member] | Other Loans [Member] | Substandard [Member]
Acquired loans	4,871	4,934
Consumer Portfolio Segment [Member] | Other Loans [Member] | Doubtful [Member]
Acquired loans
Consumer Portfolio Segment [Member] | Other Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member]
Acquired loans	43,090	51,467
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Pass [Member]
Acquired loans	41,995	50,625
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Special Mention [Member]
Acquired loans	14	21
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Substandard [Member]
Acquired loans	1,081	821
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Doubtful [Member]
Acquired loans
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Commercial Real Estate Portfolio Segment [Member]
Acquired loans	4,590,899	4,239,612
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Acquired loans	4,519,044	4,150,321
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Acquired loans	11,210	29,330
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Acquired loans	60,407	59,658
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Acquired loans	238	303
Commercial Real Estate Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Acquired loans	786,077	614,155
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Acquired loans	778,757	603,126
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Acquired loans	2,344	5,795
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]
Acquired loans	4,960	5,218
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Doubtful [Member]
Acquired loans	16	16
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Acquired loans	1,193,464	1,094,633
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Pass [Member]
Acquired loans	1,168,255	1,066,902
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Special Mention [Member]
Acquired loans	1,790	3,954
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Substandard [Member]
Acquired loans	23,197	23,490
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Doubtful [Member]
Acquired loans	222	287
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member]
Acquired loans	3,759,251	3,818,037
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Pass [Member]
Acquired loans	3,670,572	3,712,847
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Special Mention [Member]
Acquired loans	34,204	48,206
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Substandard [Member]
Acquired loans	53,977	56,984
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Doubtful [Member]
Acquired loans	498
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member]
Acquired loans	2,420,121	2,387,777
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Pass [Member]
Acquired loans	2,374,014	2,337,097
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Special Mention [Member]
Acquired loans	12,663	15,064
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Substandard [Member]
Acquired loans	33,444	35,616
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Doubtful [Member]
Acquired loans
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member]
Acquired loans	591,533	637,032
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member] | Pass [Member]
Acquired loans	570,334	604,796
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member] | Special Mention [Member]
Acquired loans	19,624	30,524
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member] | Substandard [Member]
Acquired loans	1,575	1,712
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member] | Doubtful [Member]
Acquired loans
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member]
Acquired loans	747,597	793,228
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member] | Pass [Member]
Acquired loans	726,224	770,954
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member] | Special Mention [Member]
Acquired loans	1,917	2,618
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member] | Substandard [Member]
Acquired loans	18,958	19,656
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member] | Doubtful [Member]
Acquired loans	498
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Commercial Portfolio Segment [Member]
Acquired loans	1,099,951	973,519
Commercial Portfolio Segment [Member] | Pass [Member]
Acquired loans	1,078,076	882,442
Commercial Portfolio Segment [Member] | Special Mention [Member]
Acquired loans	6,465	74,278
Commercial Portfolio Segment [Member] | Substandard [Member]
Acquired loans	15,387	16,592
Commercial Portfolio Segment [Member] | Doubtful [Member]
Acquired loans	23	73
Commercial Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans		134
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Acquired loans	971,704	825,217
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Pass [Member]
Acquired loans	953,138	736,377
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Special Mention [Member]
Acquired loans	6,140	74,254
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Substandard [Member]
Acquired loans	12,426	14,402
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Doubtful [Member]
Acquired loans		50
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans		134
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Acquired loans	128,247	148,302
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Pass [Member]
Acquired loans	124,938	146,065
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Special Mention [Member]
Acquired loans	325	24
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Substandard [Member]
Acquired loans	2,961	2,190
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Doubtful [Member]
Acquired loans	23	23
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Commercial Portfolio Segment [Member] | Acquired Loans [Member]
Acquired loans	894,604	1,062,163
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Pass [Member]
Acquired loans	833,374	1,012,689
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Special Mention [Member]
Acquired loans	20,446	13,901
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Substandard [Member]
Acquired loans	40,784	35,573
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Doubtful [Member]
Acquired loans
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member]
Acquired loans	891,261	995,587
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member] | Pass [Member]
Acquired loans	830,225	946,322
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member] | Special Mention [Member]
Acquired loans	20,446	13,901
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member] | Substandard [Member]
Acquired loans	40,590	35,364
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member] | Doubtful [Member]
Acquired loans
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member]
Acquired loans	3,343	66,576
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member] | Pass [Member]
Acquired loans	3,149	66,367
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member] | Special Mention [Member]
Acquired loans
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member] | Substandard [Member]
Acquired loans	194	209
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member] | Doubtful [Member]
Acquired loans
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Unallocated Financing Receivables [Member]
Acquired loans	138,646	26,962
Unallocated Financing Receivables [Member] | Pass [Member]
Acquired loans	138,646	26,962
Unallocated Financing Receivables [Member] | Special Mention [Member]
Acquired loans
Unallocated Financing Receivables [Member] | Substandard [Member]
Acquired loans
Unallocated Financing Receivables [Member] | Doubtful [Member]
Acquired loans
Unallocated Financing Receivables [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Unallocated Financing Receivables [Member] | Acquired Loans [Member]
Acquired loans		142,409
Unallocated Financing Receivables [Member] | Acquired Loans [Member] | Pass [Member]
Acquired loans		142,409
Unallocated Financing Receivables [Member] | Acquired Loans [Member] | Special Mention [Member]
Acquired loans
Unallocated Financing Receivables [Member] | Acquired Loans [Member] | Substandard [Member]
Acquired loans
Unallocated Financing Receivables [Member] | Acquired Loans [Member] | Doubtful [Member]
Acquired loans
Unallocated Financing Receivables [Member] | Acquired Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans

Note 6 - Loans Acquired - Impac

Note 6 - Loans Acquired - Impact of the Adjustments on the Company's Financial Results for the Following Reporting Periods (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Impact on net interest income and pre-tax income	$ 450	$ 1,184
Impact, net of taxes	$ 331	$ 720

Note 6 - Loans Acquired - Chang

Note 6 - Loans Acquired - Changes in the Carrying Amount of the Accretable Yield for All Purchased Impaired and Non-impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Beginning balance	$ 620	$ 1,655
Additions
Accretable yield adjustments	1,134	1,228
Accretion	(385)	(1,666)
Payments and other reductions, net
Balance, ending	1,369	1,217
Beginning balance	17,116	17,802
Additions
Accretion	385	1,666
Payments and other reductions, net	104	(10,773)
Balance, ending	$ 17,605	$ 8,695

Note 7 - Goodwill and Other I71

Note 7 - Goodwill and Other Intangible Assets (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Oct. 19, 2017	May 15, 2017
Goodwill, Ending Balance	$ 845,687,000	$ 842,651,000
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	10 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	15 years
Core Deposit Premium [Member] | Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	10 years
Core Deposit Premium [Member] | Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	15 years
OKSB Merger [Member]
Goodwill, Ending Balance			$ 229,144,000
OKSB Merger [Member] | Core Deposit Premium [Member]
Finite-lived Intangible Assets Acquired		42,100,000
OKSB Merger [Member] | Other Intangible Assets [Member]
Finite-lived Intangible Assets Acquired		3,800,000
First Texas BHC, Inc. [Member]
Goodwill, Ending Balance			$ 240,800,000
First Texas BHC, Inc. [Member] | Core Deposit Premium [Member]
Finite-lived Intangible Assets Acquired		7,300,000
Hardeman County Investment Company, Inc. [Member]
Goodwill, Ending Balance				$ 29,371,000
Finite-lived Intangible Assets Acquired		830,000
Hardeman County Investment Company, Inc. [Member] | Core Deposit Premium [Member]
Finite-lived Intangible Assets Acquired		$ 7,800,000

Note 7 - Goodwill and Other I72

Note 7 - Goodwill and Other Intangible Assets - Goodwill, Core Deposit Premiums and Purchased Credit Card Relationships (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Goodwill, Ending Balance	$ 845,687	$ 842,651
Intangible assets, net	99,504	106,071
Total goodwill and other intangible assets	945,191	948,722
Core Deposit Premium [Member]
Gross carrying amount	105,984	105,984
Accumulated amortization	(19,009)	(16,659)
Intangible assets, net	86,975	89,325
Books of Business Intangible [Member]
Gross carrying amount	15,234	15,414
Accumulated amortization	(2,912)	(2,827)
Intangible assets, net	12,322	12,587
Other Intangible Assets [Member]
Gross carrying amount	2,068	6,037
Accumulated amortization	(1,861)	(1,878)
Intangible assets, net	$ 207	$ 4,159

Note 7 - Goodwill and Other I73

Note 7 - Goodwill and Other Intangible Assets - Amortization Expense (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Remainder of 2018	$ 8,171
2,019	10,565
2,020	10,552
2,021	10,490
2,022	10,438
Thereafter	49,288
Total	$ 99,504	$ 106,071

Note 8 - Time Deposits (Details

Note 8 - Time Deposits (Details Textual) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Time Deposits, $100,000 or More, Total	$ 1,035,000,000	$ 736,000,000
Time Deposits, at or Above FDIC Insurance Limit	$ 664,732,000	$ 396,771,000

Note 9 - Income Taxes (Details

Note 9 - Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%
Earliest Tax Year [Member] | Domestic Tax Authority [Member]
Open Tax Year	2,014
Earliest Tax Year [Member] | State and Local Jurisdiction [Member]
Open Tax Year	2,014
Metropolitan [Member]
Operating Loss Carryforwards, Total				$ 35.6
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%

Note 9 - Income Taxes - Provisi

Note 9 - Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income taxes currently payable	$ 10,045	$ 6,601
Deferred income taxes	3,921	3,090
Provision for income taxes	$ 13,966	$ 9,691

Note 9 - Income Taxes - Tax Eff

Note 9 - Income Taxes - Tax Effects of Temporary Differences Related to Deferred Taxes Included in Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Loans acquired	$ 18,418	$ 19,885
Allowance for loan losses	12,294	10,773
Valuation of foreclosed assets	2,852	2,852
Tax NOLs from acquisition	7,727	7,821
Deferred compensation payable	2,534	2,433
Accrued equity and other compensation	4,472	5,302
Acquired securities	578	578
Unrealized loss on available-for-sale securities	12,217	6,107
Other	7,279	8,813
Gross deferred tax assets	68,371	64,564
Deferred tax liabilities:
Goodwill and other intangible amortization	(32,579)	(32,572)
Accumulated depreciation	(9,317)	(8,945)
Other	(4,103)	(4,413)
Gross deferred tax liabilities	(45,999)	(45,930)
Net deferred tax asset, included in other assets	$ 22,372	$ 18,634

Note 9 - Income Taxes - Reconci

Note 9 - Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Computed at the statutory rate (1)	[1]	$ 13,708	$ 11,134
State income taxes, net of federal tax benefit		1,822	539
Discrete items related to ASU 2016-09		(273)	(1,082)
Tax exempt interest income		(677)	(1,071)
Tax exempt earnings on BOLI		(186)	(218)
Other differences, net		(428)	389
Provision for income taxes		$ 13,966	$ 9,691
[1]	The statutory rate was 21% for the three months ended March 31, 2018, compared to 35% for the three months ended March 31, 2017.

Note 10 - Securities Sold Und79

Note 10 - Securities Sold Under Agreements to Repurchase (Details Textual) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement	$ 114.6	$ 122

Note 10 - Securities Sold Und80

Note 10 - Securities Sold Under Agreements to Repurchase - Contractual Maturity of the Agreements (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Repurchase agreements:
Repurchase agreements	$ 114,600	$ 122,000
US Government Agencies Debt Securities [Member]
Repurchase agreements:
Repurchase agreements	114,634	122,019
Maturity Overnight [Member] | US Government Agencies Debt Securities [Member]
Repurchase agreements:
Repurchase agreements	114,634	122,019
Maturity Less than 30 Days [Member] | US Government Agencies Debt Securities [Member]
Repurchase agreements:
Repurchase agreements
Maturity 30 to 90 Days [Member] | US Government Agencies Debt Securities [Member]
Repurchase agreements:
Repurchase agreements
Maturity Greater than 90 Days [Member] | US Government Agencies Debt Securities [Member]
Repurchase agreements:
Repurchase agreements

Note 11 - Other Borrowings an81

Note 11 - Other Borrowings and Subordinated Notes and Debentures (Details Textual) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended	15 Months Ended
	Mar. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2018	Oct. 31, 2017
Federal Home Loan Bank, Advances, Maturities Summary, Due in Next Twelve Months, Total	$ 653	$ 653		$ 653
Advances from Federal Home Loan Banks, Total	1,100	1,100		1,100
Advances from Federal Home Loan Bank Available	2,200	2,200		2,200
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	3,700	$ 3,700		3,700
Federal Home Loan Bank Advances [Member]
Debt Instrument, Term			1 year
U.S. Bank National Association [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity					$ 75
London Interbank Offered Rate (LIBOR) [Member] | U.S. Bank National Association [Member] | Revolving Credit Facility [Member]
Debt Instrument, Basis Spread on Variable Rate		1.50%
Subordinated Debt [Member]
Debt Instrument, Face Amount	$ 330	$ 330		$ 330
Debt Instrument, Interest Rate, Stated Percentage	5.00%	5.00%		5.00%
Debt Issuance Costs, Net, Total	$ 3.3	$ 3.3		$ 3.3
Subordinated Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	2.15%			2.15%

Note 11 - Other Borrowings an82

Note 11 - Other Borrowings and Subordinated Notes and Debentures - Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Other borrowings	$ 1,140,986	$ 1,380,024
Subordinated notes and debentures	468,465	140,565
Unamortized debt issuance costs	(3,289)
Total other borrowings and subordinated debt	1,609,451	1,520,589
U.S. Bank National Association [Member] | Revolving Credit Facility [Member]
Revolving credit agreement, due 10/5/2018, floating rate of 1.50% above the one month LIBOR rate, unsecured		75,000
Federal Home Loan Bank Advances [Member]
FHLB advances, net of discount, due 2018 to 2033, 1.33% to 7.37% secured by residential real estate loans	1,140,986	1,261,642
Note Payable Due 10/15/2020 [Member]
Notes payable, due 10/15/2020, 3.85%, fixed rate, unsecured		43,382
Subordinated Debt [Member]
Subordinated Debentures	330,000
Trust Preferred Securities Due 12/30/2033 Floating Rate of 2.8% Above Three Month LIBOR 1 [Member]
Subordinated notes and debentures	20,620	20,620
Trust Preferred Securities Due 6/30/2035 [Member]
Subordinated notes and debentures	9,344	9,327
Trust Preferred Securities Due 9/15/2037 [Member]
Subordinated notes and debentures	10,310	10,284
Trust Preferred Securities Due 12/5/2033 [Member]
Subordinated notes and debentures	5,155	5,156
Trust Preferred Securities Due 10/18/2034 [Member]
Subordinated notes and debentures	5,155	5,148
Trust Preferred Securities, Due 6/6/2037 [Member]
Subordinated notes and debentures	10,310	10,288
Trust Preferred Securities, Due 12/15/2035 [Member]
Subordinated notes and debentures	6,702	6,702
Trust Preferred Securities, Due 6/26/2033 [Member]
Subordinated notes and debentures	20,619	20,619
Trust Preferred Securities, Due 10/7/2033 [Member]
Subordinated notes and debentures	25,774	25,774
Second Trust Preferred Securities Due 9/15/2037 [Member]
Subordinated notes and debentures	8,248	8,248
Trust Preferred Securities, Due 9/30/2023 [Member]
Subordinated notes and debentures	$ 19,517	$ 18,399

Note 11 - Other Borrowings an83

Note 11 - Other Borrowings and Subordinated Notes and Debentures - Long-term Debt (Details) (Parentheticals)	1 Months Ended	3 Months Ended	12 Months Ended	15 Months Ended
	Mar. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2018
U.S. Bank National Association [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate		1.50%
Federal Home Loan Bank Advances [Member] | Minimum [Member]
Fixed rate	1.33%	1.33%	1.33%	1.33%
Federal Home Loan Bank Advances [Member] | Maximum [Member]
Fixed rate	7.37%	7.37%	7.37%	7.37%
Note Payable Due 10/15/2020 [Member]
Fixed rate	3.85%	3.85%	3.85%	3.85%
Subordinated Debt [Member]
Fixed rate	5.00%	5.00%		5.00%
Subordinated Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate	2.15%			2.15%
Trust Preferred Securities Due 12/30/2033 Floating Rate of 2.8% Above Three Month LIBOR 1 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate		2.80%	2.80%
Trust Preferred Securities Due 6/30/2035 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate		1.75%	1.75%
Trust Preferred Securities Due 9/15/2037 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate		1.37%	1.37%
Trust Preferred Securities Due 12/5/2033 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate		2.88%	2.88%
Trust Preferred Securities Due 10/18/2034 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate		2.00%	2.00%
Trust Preferred Securities, Due 6/6/2037 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate		1.57%	1.57%
Trust Preferred Securities, Due 12/15/2035 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate		1.45%	1.45%
Trust Preferred Securities, Due 6/26/2033 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate		3.10%	3.10%
Trust Preferred Securities, Due 10/7/2033 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate		2.85%	2.85%
Second Trust Preferred Securities Due 9/15/2037 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate		2.00%	2.00%

Note 11 - Other Borrowings an84

Note 11 - Other Borrowings and Subordinated Notes and Debentures - Aggregate Annual Maturities of Long-term Debt (Details) $ in Thousands	Mar. 31, 2018USD ($)
2,018	$ 102,899
2,019	2,577
2,020	2,474
2,021	2,165
2,022	1,314
Thereafter	845,022
Total	$ 956,451

Note 13 - Common Stock (Details

Note 13 - Common Stock (Details Textual)	Feb. 08, 2018	Jul. 23, 2012shares	Apr. 19, 2018shares	Apr. 18, 2018shares	Mar. 31, 2018shares	Dec. 31, 2017shares
Stockholders' Equity Note, Stock Split, Conversion Ratio	2
Common Stock, Shares Authorized					120,000,000	120,000,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased		1,700,000
Percent of Oustanding Stock		2.00%
Stock Repurchase Program, Number of Additional Shares to be Repurchased		308,272
Subsequent Event [Member]
Common Stock, Shares Authorized			175,000,000	120,000,000

Note 14 - Undivided Profits (De

Note 14 - Undivided Profits (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Threshold Percentage of Net Profits Exceeded by Dividends Declared, Any Calendar Year	75.00%
Threshold Percentage of Net Profits Exceeded by Dividends Declared, Combined with Preceding Year	75.00%
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval	$ 1.6
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%
Common Equity Tier 1 Ratio Required To Be Well Capitalized	6.50%
Capital Conservation Buffer Phase In Amount	0.625%
Capital Conservation Buffer Phase In Period	4 years
Capital Conservation Buffer	2.50%
Capital to Risk Weighted Assets	9.64%

Note 15 - Stock Based Compens87

Note 15 - Stock Based Compensation (Details Textual) $ / shares in Units, shares in Thousands	Feb. 08, 2018	Mar. 31, 2018USD ($)$ / sharesshares	Mar. 31, 2017USD ($)shares
Stockholders' Equity Note, Stock Split, Conversion Ratio	2
Allocated Share-based Compensation Expense, Total		$ 2,621,000	$ 2,599,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options		169,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options		$ 24,932,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		2 years 146 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value		$ 4,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value		$ 4,430,000
Share Price | $ / shares		$ 28.45
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value		$ 646,000	$ 414,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares		0	0

Note 15 - Stock Based Compens88

Note 15 - Stock Based Compensation - Stock Compensation Plans (Details) - $ / shares shares in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Stock Options Outstanding Number of Shares, Balance (in shares)	812
Stock Options Outstanding Weighted Average Exercise Price, Balance (in dollars per share)	$ 21.98
Stock Options Outstanding Number of Shares, Granted (in shares)	0	0
Stock Options Outstanding Weighted Average Exercise Price, Granted (in dollars per share)
Stock Options Outstanding Number of Shares, Stock Options Exercised (in shares)	(83)
Stock Options Outstanding Weighted Average Exercise Price, Stock Options Exercised (in dollars per share)	$ 20.67
Stock Awards/Units Outstanding Number of Shares, Stock Options Exercised (in shares)	83
Non-Vested Stock Awards Outstanding Weighted Average Grant-Date Fair-Value, Stock Options Exercised (in shares)	83
Stock Options Outstanding Number of Shares, Stock Awards/Units Vested (in shares)
Stock Options Outstanding Number of Shares, Forfeited/Expired (in shares)	(3)
Stock Options Outstanding Weighted Average Exercise Price, Forfeited/Expired (in dollars per share)	$ 23.51
Stock Options Outstanding Number of Shares, Balance (in shares)	726
Stock Options Outstanding Weighted Average Exercise Price, Balance (in dollars per share)	$ 22.12
Stock Options Outstanding Number of Shares, Exercisable (in shares)	693
Stock Options Outstanding Weighted Average Exercise Price,Exercisable (in dollars per share)	$ 22.06
Restricted Stock [Member]
Stock Awards/Units Outstanding Number of Shares, Balance (in shares)	162
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Balance (in dollars per share)	$ 20.86
Stock Awards/Units Outstanding Number of Shares, Granted (in shares)
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Granted (in dollars per share)
Stock Options Outstanding Number of Shares, Stock Options Exercised (in shares)
Stock Awards/Units Outstanding Number of Shares, Stock Options Exercised (in shares)
Non-Vested Stock Awards Outstanding Weighted Average Grant-Date Fair-Value, Stock Options Exercised (in shares)
Stock Options Outstanding Number of Shares, Stock Awards/Units Vested (in shares)	(40)
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Vested (in dollars per share)	$ 17.89
Stock Awards/Units Outstanding Number of Shares, Forfeited/Expired (in shares)	(9)
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Forfeited/Expired (in dollars per share)	$ 19.67
Stock Awards/Units Outstanding Number of Shares, Balance (in shares)	113
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Balance (in dollars per share)	$ 22.01
Stock Options Outstanding Number of Shares, Exercisable (in shares)
Stock Units [Member]
Stock Awards/Units Outstanding Number of Shares, Balance (in shares)	652
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Balance (in dollars per share)	$ 27.92
Stock Awards/Units Outstanding Number of Shares, Granted (in shares)	280
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Granted (in dollars per share)	$ 29.16
Stock Options Outstanding Number of Shares, Stock Options Exercised (in shares)
Stock Awards/Units Outstanding Number of Shares, Stock Options Exercised (in shares)
Non-Vested Stock Awards Outstanding Weighted Average Grant-Date Fair-Value, Stock Options Exercised (in shares)
Stock Options Outstanding Number of Shares, Stock Awards/Units Vested (in shares)	(144)
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Vested (in dollars per share)	$ 27.87
Stock Awards/Units Outstanding Number of Shares, Forfeited/Expired (in shares)	(46)
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Forfeited/Expired (in dollars per share)	$ 28.22
Stock Awards/Units Outstanding Number of Shares, Balance (in shares)	742
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Balance (in dollars per share)	$ 28.38
Stock Options Outstanding Number of Shares, Exercisable (in shares)

Note 15 - Stock Based Compens89

Note 15 - Stock Based Compensation - Stock Options Outstanding by Range of Exercise Prices (Details)	3 Months Ended
	Mar. 31, 2018$ / sharesshares
Range of exercise prices, minimum (in dollars per share)	$ 8.78
Range of exercise prices, maximum (in dollars per share)	$ 24.07
Options outstanding, number of shares (in shares) | shares	726
Options outstanding, weighted average remaining contractual life (Year)	6 years 361 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 22.12
Options exercisable, number of shares (in shares) | shares	693
Options exercisable, weighted average exercise price (in dollars per share)	$ 22.06
Range01 [Member]
Range of exercise prices, minimum (in dollars per share)	8.78
Range of exercise prices, maximum (in dollars per share)	$ 9.46
Options outstanding, number of shares (in shares) | shares	3
Options outstanding, weighted average remaining contractual life (Year)	1 year 354 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 9.22
Options exercisable, number of shares (in shares) | shares	3
Options exercisable, weighted average exercise price (in dollars per share)	$ 9.22
Range 02 [Member]
Range of exercise prices, minimum (in dollars per share)	10.65
Range of exercise prices, maximum (in dollars per share)	$ 10.65
Options outstanding, number of shares (in shares) | shares	5
Options outstanding, weighted average remaining contractual life (Year)	3 years 328 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 10.65
Options exercisable, number of shares (in shares) | shares	5
Options exercisable, weighted average exercise price (in dollars per share)	$ 10.65
Range 03 [Member]
Range of exercise prices, minimum (in dollars per share)	10.76
Range of exercise prices, maximum (in dollars per share)	$ 10.76
Options outstanding, number of shares (in shares) | shares	2
Options outstanding, weighted average remaining contractual life (Year)	1 year 292 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 10.76
Options exercisable, number of shares (in shares) | shares	2
Options exercisable, weighted average exercise price (in dollars per share)	$ 10.76
Range 04 [Member]
Range of exercise prices, minimum (in dollars per share)	15.16
Range of exercise prices, maximum (in dollars per share)	$ 15.16
Options outstanding, number of shares (in shares) | shares	25
Options outstanding, weighted average remaining contractual life (Year)	58 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 15.16
Options exercisable, number of shares (in shares) | shares	25
Options exercisable, weighted average exercise price (in dollars per share)	$ 15.16
Range 05 [Member]
Range of exercise prices, minimum (in dollars per share)	20.29
Range of exercise prices, maximum (in dollars per share)	$ 20.29
Options outstanding, number of shares (in shares) | shares	70
Options outstanding, weighted average remaining contractual life (Year)	6 years 273 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 20.29
Options exercisable, number of shares (in shares) | shares	70
Options exercisable, weighted average exercise price (in dollars per share)	$ 20.29
Range 06 [Member]
Range of exercise prices, minimum (in dollars per share)	20.36
Range of exercise prices, maximum (in dollars per share)	$ 20.36
Options outstanding, number of shares (in shares) | shares	3
Options outstanding, weighted average remaining contractual life (Year)	6 years 229 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 20.36
Options exercisable, number of shares (in shares) | shares	2
Options exercisable, weighted average exercise price (in dollars per share)	$ 20.36
Range 07 [Member]
Range of exercise prices, minimum (in dollars per share)	22.20
Range of exercise prices, maximum (in dollars per share)	$ 22.20
Options outstanding, number of shares (in shares) | shares	76
Options outstanding, weighted average remaining contractual life (Year)	6 years 357 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 22.20
Options exercisable, number of shares (in shares) | shares	76
Options exercisable, weighted average exercise price (in dollars per share)	$ 22.20
Range 08 [Member]
Range of exercise prices, minimum (in dollars per share)	22.75
Range of exercise prices, maximum (in dollars per share)	$ 22.75
Options outstanding, number of shares (in shares) | shares	436
Options outstanding, weighted average remaining contractual life (Year)	7 years 131 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 22.75
Options exercisable, number of shares (in shares) | shares	436
Options exercisable, weighted average exercise price (in dollars per share)	$ 22.75
Range 09 [Member]
Range of exercise prices, minimum (in dollars per share)	23.51
Range of exercise prices, maximum (in dollars per share)	$ 23.51
Options outstanding, number of shares (in shares) | shares	99
Options outstanding, weighted average remaining contractual life (Year)	7 years 240 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 23.51
Options exercisable, number of shares (in shares) | shares	67
Options exercisable, weighted average exercise price (in dollars per share)	$ 23.51
Range 10 [Member]
Range of exercise prices, minimum (in dollars per share)	24.07
Range of exercise prices, maximum (in dollars per share)	$ 24.07
Options outstanding, number of shares (in shares) | shares	7
Options outstanding, weighted average remaining contractual life (Year)	7 years 167 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 24.07
Options exercisable, number of shares (in shares) | shares	7
Options exercisable, weighted average exercise price (in dollars per share)	$ 24.07

Note 16 - Earnings Per Share 90

Note 16 - Earnings Per Share ("EPS") (Details Textual) shares in Thousands	Feb. 08, 2018	Mar. 31, 2018shares	Mar. 31, 2017shares
Stockholders' Equity Note, Stock Split, Conversion Ratio	2
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		0	0

Note 16 - Earnings Per Share -

Note 16 - Earnings Per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Net income		$ 51,312	$ 22,120
Average common shares outstanding (in shares)		92,182	62,702
Average potential dilutive common shares (in shares)		457	524
Average diluted common shares (in shares)		92,639	63,226
Basic earnings per share (in dollars per share)	[1]	$ 0.56	$ 0.35
Diluted earnings per share (in dollars per share)	[1]	$ 0.55	$ 0.35
[1]	All per share amounts have been restated to reflect the effect of the two-for-one stock split on February 8, 2018.

Note 17 - Additional Cash Flo92

Note 17 - Additional Cash Flow Information - Additional Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest paid	$ 22,863	$ 6,160
Income taxes (refunded) paid	(7,375)	23
Transfers of Premises Held-for-sale to Foreclosed Assets Held-for-sale [Member]
Transfers of loans to foreclosed assets held for sale	1,316	2,044
Transfer of Premises to Foreclosed Assets and Other Real Estate Owned [Member]
Transfers of loans to foreclosed assets held for sale	$ 106

Note 18 - Other Operating Exp93

Note 18 - Other Operating Expenses - Other Operating Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Professional services	$ 4,330	$ 5,169
Postage	1,399	1,131
Telephone	1,486	1,078
Credit card expense	3,228	2,837
Marketing	1,660	1,364
Operating supplies	749	355
Amortization of intangibles	2,837	1,550
Branch right sizing expense	61	118
Other expense	9,744	6,285
Total other operating expenses	$ 25,494	$ 19,887

Note 20 - Commitments and Cre94

Note 20 - Commitments and Credit Risk (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Letters of Credit Outstanding, Amount	$ 39,372,000	$ 47,621,000
Standby Letters of Credit [Member]
Deferred Revenue	$ 0	0
Minimum [Member]
Letters of Credit Term	270 days
Maximum [Member]
Letters of Credit Term	15 years
Credit Card Commitments to Extend Credit [Member]
Commitments and Contingencies	$ 567,620,000	564,592,000
Other Loan Commitments to Extend Credit [Member]
Commitments and Contingencies	$ 3,288,010,000	$ 3,086,696,000

Note 21 - Fair Value Measurem95

Note 21 - Fair Value Measurements (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Real Estate Acquired Through Foreclosure	$ 29,140,000	$ 32,118,000
Impaired Financing Receivable, Related Allowance	444,000	338,000
Collateral Dependent Loans [Member]
Impaired Financing Receivable, Related Allowance	$ 243,000	2,195,000
Commercial and Residential Real Estate Collateral [Member] | Minimum [Member]
Fair Value Percentage Of Collateral Discount	10.00%
Commercial and Residential Real Estate Collateral [Member] | Maximum [Member]
Fair Value Percentage Of Collateral Discount	40.00%
Foreclosed Assets Not Covered By FDIC Loss Share [Member]
Real Estate Acquired Through Foreclosure	$ 29,100,000	$ 32,100,000
Special Mention Or Worse [Member]
Collateral Dependent Loans Amount At Which All Loans Are Tested	$ 1,500,000

Note 21 - Fair Value Measurem96

Note 21 - Fair Value Measurements - Fair Value of Financial Assets Measure on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Available-for-sale securities	$ 1,830,113	$ 1,589,517
Fair Value, Measurements, Recurring [Member]
Available-for-sale securities	185,888
Other assets held for sale	24,784	165,780
Derivative asset	6,381	3,634
Other liabilities held for sale	(2,781)	(157,366)
Derivative liability	(6,326)	(3,068)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities
Other assets held for sale
Derivative asset
Other liabilities held for sale
Derivative liability
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities	185,888
Other assets held for sale
Derivative asset	6,381	3,634
Other liabilities held for sale
Derivative liability	(6,326)	(3,068)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities
Other assets held for sale	24,784	165,780
Derivative asset
Other liabilities held for sale	(2,781)	(157,366)
Derivative liability
US Government Agencies Debt Securities [Member]
Available-for-sale securities	149,804	139,724
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale securities	149,804	139,724
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities	149,804	139,724
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Available-for-sale securities	1,356,179	1,187,317
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale securities	1,356,179	1,187,317
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities	1,356,179	1,187,317
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities
Other Securities [Member]
Available-for-sale securities	138,242	119,311
Other Securities [Member] | Fair Value, Measurements, Recurring [Member]
Other securities	138,242	119,311
Other Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Other securities
Other Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Other securities	138,242	119,311
Other Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Other securities
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities	$ 185,888	143,165
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale securities		143,165
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities		143,165
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities

Note 21 - Fair Value Measurem97

Note 21 - Fair Value Measurements - Fair Value of Financial Assets Measured on a Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)		Mar. 31, 2018	Dec. 31, 2017
Impaired loans (1) (2) (collateral dependent)	[1],[2]	$ 12,358,000	$ 11,229,000
Foreclosed assets and other real estate owned (1)	[2]	23,983,000	24,093
Fair Value, Inputs, Level 3 [Member]
Impaired loans (1) (2) (collateral dependent)	[1],[2]	12,358,000	11,229,000
Foreclosed assets and other real estate owned (1)	[2]	23,983,000	24,093
Fair Value, Inputs, Level 1 [Member]
Foreclosed assets and other real estate owned (1)	[2]
Fair Value, Inputs, Level 2 [Member]
Foreclosed assets and other real estate owned (1)	[2]
[1]	Specific allocations of $243,000 and $2,195,000 were related to the impaired collateral dependent loans for which fair value re-measurements took place during the periods ended March 31, 2018 and December 31, 2017, respectively.
[2]	These amounts represent the resulting carrying amounts on the Consolidated Balance Sheets for impaired collateral dependent loans and foreclosed assets and other real estate owned for which fair value re-measurements took place during the period.

Note 21 - Fair Value Measurem98

Note 21 - Fair Value Measurements - Estimated Fair Values and Related Carrying Amounts of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Held-to-maturity securities	$ 354,649	$ 373,298
Reported Value Measurement [Member]
Cash and cash equivalents	859,664	598,042
Interest bearing balances due from banks - time	3,069	3,314
Held-to-maturity securities	352,756	368,058
Mortgage loans held for sale	17,708	24,038
Interest receivable	42,129	43,528
Federal funds purchased and securities sold under agreements to repurchase	120,909	122,444
Other borrowings	1,140,986	1,380,024
Subordinated notes and debentures	468,465	140,565
Interest payable	3,874	4,564
Reported Value Measurement [Member] | Non-Interest Bearing Transaction Accounts [Member]
Deposits	2,734,287	2,665,249
Reported Value Measurement [Member] | Interest Bearing Transaction Accounts and Savings Deposits [Member]
Deposits	6,720,754	6,494,896
Reported Value Measurement [Member] | Time Deposits [Member]
Deposits	2,201,874	1,932,730
Reported Value Measurement [Member] | Legacy Loans [Member]
Legacy loans, net	6,243,176	5,663,941
Reported Value Measurement [Member] | Acquired Loans [Member]
Legacy loans, net	4,696,945	5,074,076
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	859,664	598,042
Interest bearing balances due from banks - time	3,069	3,314
Held-to-maturity securities	354,649	373,298
Mortgage loans held for sale	17,708	24,038
Interest receivable	42,129	43,528
Federal funds purchased and securities sold under agreements to repurchase	120,909	122,444
Other borrowings	1,145,193	1,381,365
Subordinated notes and debentures	413,968	136,474
Interest payable	3,874	4,564
Estimate of Fair Value Measurement [Member] | Non-Interest Bearing Transaction Accounts [Member]
Deposits	2,734,287	2,665,249
Estimate of Fair Value Measurement [Member] | Interest Bearing Transaction Accounts and Savings Deposits [Member]
Deposits	6,720,754	6,494,896
Estimate of Fair Value Measurement [Member] | Time Deposits [Member]
Deposits	2,179,221	1,915,539
Estimate of Fair Value Measurement [Member] | Legacy Loans [Member]
Legacy loans, net	6,214,776	5,646,505
Estimate of Fair Value Measurement [Member] | Acquired Loans [Member]
Legacy loans, net	4,675,579	5,058,455
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	859,664	598,042
Interest bearing balances due from banks - time
Held-to-maturity securities
Mortgage loans held for sale
Interest receivable
Federal funds purchased and securities sold under agreements to repurchase
Other borrowings
Subordinated notes and debentures
Interest payable
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Non-Interest Bearing Transaction Accounts [Member]
Deposits
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Bearing Transaction Accounts and Savings Deposits [Member]
Deposits
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Time Deposits [Member]
Deposits
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Legacy Loans [Member]
Legacy loans, net
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Acquired Loans [Member]
Legacy loans, net
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents
Interest bearing balances due from banks - time	3,069	3,314
Held-to-maturity securities	354,649	373,298
Mortgage loans held for sale
Interest receivable	42,129	43,528
Federal funds purchased and securities sold under agreements to repurchase	120,909	122,444
Other borrowings	1,145,193	1,381,365
Subordinated notes and debentures	413,968	136,474
Interest payable	3,874	4,564
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Non-Interest Bearing Transaction Accounts [Member]
Deposits	2,734,287	2,665,249
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Bearing Transaction Accounts and Savings Deposits [Member]
Deposits	6,720,754	6,494,896
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Time Deposits [Member]
Deposits
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Legacy Loans [Member]
Legacy loans, net
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Acquired Loans [Member]
Legacy loans, net
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents
Interest bearing balances due from banks - time
Held-to-maturity securities
Mortgage loans held for sale	17,708	24,038
Interest receivable
Federal funds purchased and securities sold under agreements to repurchase
Other borrowings
Subordinated notes and debentures
Interest payable
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Non-Interest Bearing Transaction Accounts [Member]
Deposits
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Bearing Transaction Accounts and Savings Deposits [Member]
Deposits
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Time Deposits [Member]
Deposits	2,179,221	1,915,539
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Legacy Loans [Member]
Legacy loans, net	6,214,776	5,646,505
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Acquired Loans [Member]
Legacy loans, net	$ 4,675,579	$ 5,058,455