First Interstate BancSystem (FIBK) 10-Q 9 May 17 2017 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information	3 Months Ended
	Mar. 31, 2017shares
Entity Registrant Name	FIRST INTERSTATE BANCSYSTEM INC
Entity Central Index Key	860,413
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
Amendment Flag	false
Class A Common Stock
Entity Common Stock, Shares Outstanding	21,926,590
Class B Common Stock
Entity Common Stock, Shares Outstanding	23,217,418

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets
Cash and due from banks	$ 137,777	$ 146,779
Federal funds sold	95	95
Interest bearing deposits in banks	670,080	635,149
Total cash and cash equivalents	807,952	782,023
Investment securities:
Available-for-sale	1,657,591	1,611,698
Held-to-maturity (estimated fair values of $493,925 and $513,273 at March 31, 2017 and December 31, 2016, respectively)	490,968	512,770
Total investment securities	2,148,559	2,124,468
Loans held for investment	5,376,542	5,416,750
Mortgage loans held for sale	23,237	61,794
Total loans	5,399,779	5,478,544
Less allowance for loan losses	76,231	76,214
Net loans	5,323,548	5,402,330
Goodwill	212,820	212,820
Premises and equipment, net of accumulated depreciation	195,472	194,457
Company-owned life insurance	199,262	198,116
Other real estate owned (OREO)	9,428	10,019
Accrued interest receivable	27,712	29,852
Core deposit intangibles, net of accumulated amortization	9,018	9,648
Mortgage servicing rights, net of accumulated amortization and impairment reserve	19,454	18,457
Other assets	108,009	81,705
Total assets	9,061,234	9,063,895
Deposits:
Non-interest bearing	1,840,647	1,906,257
Interest bearing	5,459,532	5,469,853
Total deposits	7,300,179	7,376,110
Securities sold under repurchase agreements	587,570	537,556
Accounts payable and accrued expenses	43,838	44,923
Accrued interest payable	4,831	5,421
Deferred tax liability	12,748	6,839
Long-term debt	27,994	27,970
Other borrowed funds	1	6
Subordinated debentures held by subsidiary trusts	82,477	82,477
Total liabilities	8,059,638	8,081,302
Stockholders' equity:
Nonvoting noncumulative preferred stock without par value; authorized 100,000 shares; no shares issued and outstanding as of March 31, 2017 or December 31, 2016	0	0
Common stock	297,173	296,071
Retained earnings	707,016	694,650
Accumulated other comprehensive income, net	(2,593)	(8,128)
Total stockholders' equity	1,001,596	982,593
Total liabilities and stockholders' equity	$ 9,061,234	$ 9,063,895

Consolidated Balance Sheets (U3

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Investment securities:
Held-to-Maturity, Estimated Fair Value	$ 493,925	$ 513,273
Stockholders' equity:
Nonvoting noncumulative preferred stock, par value	$ 0	$ 0
Nonvoting noncumulative preferred stock, authorized shares	100,000	100,000
Nonvoting noncumulative preferred stock, issued shares	0	0
Nonvoting noncumulative preferred stock, outstanding shares	0	0

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest income:
Interest and fees on loans	$ 63,729	$ 62,816
Interest and dividends on investment securities:
Taxable	8,722	8,038
Exempt from federal taxes	792	879
Interest on deposits in banks	1,212	645
Interest on federal funds sold	2	2
Total interest income	74,457	72,380
Interest expense:
Interest on deposits	4,118	3,228
Interest on securities sold under repurchase agreements	248	90
Interest on long-term debt	453	449
Interest on subordinated debentures held by subsidiary trusts	745	663
Total interest expense	5,564	4,430
Net interest income	68,893	67,950
Provision for loan losses	1,730	4,000
Net interest income after provision for loan losses	67,163	63,950
Non-interest income:
Payment services revenues	8,445	7,991
Income from the origination and sale of loans	6,548	6,727
Investment Advisory, Management and Administrative Fees	5,013	4,575
Service charges on deposit accounts	4,350	4,463
Other service charges, commissions and fees	2,676	2,608
Investment securities gains, net	2	(21)
Other income	2,073	2,293
Total non-interest income	29,107	28,636
Non-interest expense:
Salaries and wages	25,741	25,268
Employee benefits	9,616	9,609
Outsourced technology services	5,300	4,832
Occupancy, net	4,789	4,664
Furniture and equipment	2,273	2,256
OREO expense, net of income	(48)	(39)
Professional fees	1,029	1,308
FDIC insurance premiums	875	1,258
Mortgage servicing rights amortization	612	634
Mortgage servicing rights impairment recovery	(70)	15
Core deposit intangibles amortization	630	827
Other expenses	12,241	11,623
Non-core acquisition expenses	705	0
Total non-interest expense	63,693	62,255
Income before income tax expense	32,577	30,331
Income tax expense	9,451	10,207
Net income	$ 23,126	$ 20,124
Basic earnings per common share	$ 0.52	$ 0.45
Diluted earnings per common share	$ 0.51	$ 0.45

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net income	$ 23,126	$ 20,124
Other comprehensive income (loss), before tax:
Change in net unrealized gains/losses during period	9,354	8,613
Reclassification adjustment for net (gains) losses included in income	(2)	21
Change in unamortized loss on available-for-sale securities transferred into held-to-maturity	463	465
Unrealized loss on derivatives	49	(2,197)
Defined benefit post-retirement benefits plans:
Change in net actuarial loss	(739)	15
Other comprehensive income (loss), before tax	9,125	6,917
Deferred tax benefit (expense) related to other comprehensive income	(3,590)	(2,722)
Other comprehensive income (loss), net of tax	5,535	4,195
Comprehensive income, net of tax	$ 28,661	$ 24,319

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders Equity (Unaudited) - USD ($) $ in Thousands	Total	Common stock	Retained earnings	Accumulated other comprehensive income
Beginning Balance at Dec. 31, 2015	$ 950,493	$ 311,720	$ 638,367	$ 406
Comprehensive income:
Net income	20,124	0	20,124	0
Other comprehensive income, net of tax	4,195	0	0	4,195
Common stock transactions:
Common shares purchased and retired 998,135 and 789,743 in 2016 and 2015, respectively	(25,309)	(25,309)	0	0
Non-vested common shares issued 189,624 and 169,577 in 2016 and 2015 respectively	0	0	0	0
25,984 and 3,484 non-vested common shares forfeited in 2016 and 2015 respectively	0	0	0	0
270,183 and 158,828 stock options exercised, net of 94,902 and 58,996 shares tendered in payment of option price and income tax withholding amounts in 2016 and 2015 respectively	996	996	0	0
Tax benefit of stock-based compensation	420	420	0	0
Stock-based compensation expense	955	955	0	0
Cash dividends declared:
Common ($0.66 per share) in 2016 and ($0.60 per share) in 2015	(9,860)	0	(9,860)	0
Ending Balance at Mar. 31, 2016	942,014	288,782	648,631	4,601
Beginning Balance at Dec. 31, 2016	982,593	296,071	694,650	(8,128)
Comprehensive income:
Net income	23,126	0	23,126	0
Other comprehensive income, net of tax	5,535	0	0	5,535
Common stock transactions:
Common shares purchased and retired 998,135 and 789,743 in 2016 and 2015, respectively	(859)	(859)	0	0
Stock Issued During Period, 16,085 and 21,414 in 2016 and 2015, respectively	0	0	0	0
Non-vested common shares issued 189,624 and 169,577 in 2016 and 2015 respectively	0	0	0	0
25,984 and 3,484 non-vested common shares forfeited in 2016 and 2015 respectively	0	0	0	0
270,183 and 158,828 stock options exercised, net of 94,902 and 58,996 shares tendered in payment of option price and income tax withholding amounts in 2016 and 2015 respectively	1,084	1,084	0	0
Stock-based compensation expense	877	877	0	0
Cash dividends declared:
Common ($0.66 per share) in 2016 and ($0.60 per share) in 2015	(10,760)	0	(10,760)	0
Ending Balance at Mar. 31, 2017	$ 1,001,596	$ 297,173	$ 707,016	$ (2,593)

Consolidated Statements of Cha7

Consolidated Statements of Changes in Stockholders Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Common stock
Common stock transactions:
Common shares purchased and retired	20,621	1,015,389
Common shares issued	200	16,347
Non-vested common shares issued	132,531	190,239
Non-vested common shares forfeited	7,214	29,844
Stock options exercised	112,936	336,598
Shares tendered in payment of option price and income tax withholding amounts	43,534	104,643
Retained earnings
Cash dividends declared:
Common (in dollars per share)	$ 0.24	$ 0.88

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 23,126	$ 20,124
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,730	4,000
Net (gain) loss on disposal of property and equipment	76	142
Depreciation and amortization	4,611	4,679
Net premium amortization on investment securities	2,791	3,238
Net gains on investment securities transactions	(2)	21
Net gains on sales of mortgage loans held for sale	(4,907)	(4,588)
Net gain on sale of OREO	184	(102)
Write-downs of OREO and other assets pending disposal	47	17
Net reversal of impairment of mortgage servicing rights	(70)	15
Deferred income tax expense	2,020	(517)
Net increase in cash surrender value of company-owned life insurance policies	(1,146)	(1,143)
Stock-based compensation expense	877	955
Tax benefits from stock-based compensation expense	0	420
Excess tax benefits from stock-based compensation	0	(307)
Originations of loans held for sale	(193,083)	(195,444)
Proceeds from sales of loans held for sale	235,020	199,316
Changes in operating assets and liabilities:
Increase in interest receivable	2,140	822
Increase in other assets	1,693	(4,567)
Decrease in accrued interest payable	(590)	224
Decrease in accounts payable and accrued expenses	(1,484)	(7,128)
Net cash provided by operating activities	73,033	20,177
Cash flows from investing activities:
Purchases of held-to-maturity investment securities	(934)	(4,870)
Purchases of available-for-sale investment securities	(113,377)	(254,098)
Proceeds from maturities and paydowns of held-to-maturity investment securities	22,751	23,925
Proceeds from maturities and paydowns of available-for-sale investment securities	74,503	153,703
Purchases of company-owned life insurance	0	0
Extensions of credit to customers, net of repayments	35,985	(5,677)
Recoveries of loans charged-off	2,142	3,409
Proceeds from sales of OREO	728	309
Acquisition of banks and bank holding companies, net of cash and cash equivalents received	28,013	0
Capital expenditures, net of sales	(4,456)	(1,408)
Net cash used in investing activities	(10,671)	(84,707)
Cash flows from financing activities:
Net increase (decrease) in deposits	(75,931)	18,526
Net increase (decrease) in repurchase agreements	50,014	(45,112)
Net increase (decrease) in other borrowed funds	(5)	31
Repayments of long-term debt	(17)	(15)
Advances on long-term debt	41	37
Proceeds from issuance of common stock	1,084	996
Excess tax benefits from stock-based compensation	0	307
Purchase and retirement of common stock	(859)	(25,309)
Dividends paid to common stockholders	(10,760)	(9,860)
Net cash provided by (used in) financing activities	(36,433)	(60,399)
Net increase (decrease) in cash and cash equivalents	25,929	(124,929)
Cash and cash equivalents at beginning of period	782,023	780,457
Cash and cash equivalents at end of period	807,952	655,528
Supplemental disclosures of cash flow information:
Cash paid during the period for income taxes	28,750	4,206
Cash paid during the period for interest expense	6,154	15,390
Transfer of loans to other real estate owned	368	3,227
Capitalization of internally originated mortgage servicing rights	$ 1,527	$ 602

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	In the opinion of management, the accompanying unaudited consolidated financial statements of First Interstate BancSystem, Inc. and subsidiaries (the “Company”) contain all adjustments (all of which are of a normal recurring nature) necessary to present fairly the financial position of the Company at March 31, 2017 and December 31, 2016 , the results of operations for each of the three month periods ended March 31, 2017 and 2016 , and cash flows and changes in stockholders' equity for each of the three month periods ended March 31, 2017 and 2016 , in conformity with U.S. generally accepted accounting principles. The balance sheet information at December 31, 2016 is derived from audited consolidated financial statements. Certain reclassifications, none of which were material, have been made to conform prior year financial statements to the March 31, 2017 presentation. These reclassifications did not change previously reported net income or stockholders’ equity. These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 . Operating results for the three months ended March 31, 2017 are not necessarily indicative of the results that may be expected for the year ending December 31, 2017 .

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2017
Business Combinations [Abstract]
Acquisitions	Acquisitions Cascade Bancorp. On November 17, 2016 , the Company entered into an agreement and plan of merger (the "Agreement") to acquire all of the outstanding stock of Cascade Bancorp, parent company of Bank of the Cascades, an Oregon-based community bank with 46 banking offices across Oregon, Idaho and Washington. Under the terms of the Agreement, each outstanding share of Cascade Bancorp will convert into the right to receive 0.14864 shares of the Company's Class A common stock and $ 1.91 in cash. Based on the closing price of the Company's Class A common stock on March 31, 2017, the merger consideration represents an aggregate purchase price of approximately $ 595,128 . As of March 31, 2017, Cascade had total assets of $ 3,136,672 , deposits of 2,714,781 and net loans of $ 2,088,174 . Upon completion of the merger, which is expected to close on May 30, 2017 subject to shareholder approval, the Company will become a regional community bank with over $ 12 billion in total assets and a geographic footprint that will span Montana, Wyoming, South Dakota, Idaho, Oregon and Washington.

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Investment Securities	he amortized cost and approximate fair values of investment securities are summarized as follows: March 31, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Available-for-Sale: U.S. Treasury notes $ 3,608 $ 5 $ (1 ) $ 3,612 Obligations of U.S. government agencies 411,096 449 (4,302 ) 407,243 U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 1,243,751 8,257 (8,345 ) 1,243,663 Private mortgage-backed securities 106 1 (1 ) 106 Other investments 2,951 16 — 2,967 Total $ 1,661,512 $ 8,728 $ (12,649 ) $ 1,657,591 March 31, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Held-to-Maturity: State, county and municipal securities $ 153,679 $ 3,121 $ (222 ) $ 156,578 Corporate securities 52,918 248 (67 ) 53,099 Obligations of U.S. government agencies 19,737 — (82 ) 19,655 U.S agency residential mortgage-backed securities & collateralized mortgage obligations 264,427 9,044 (9,086 ) 264,385 Other investments 207 1 — 208 Total $ 490,968 $ 12,414 $ (9,457 ) $ 493,925 December 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Available-for-Sale: U.S. Treasury notes $ 3,608 $ 5 $ (1 ) $ 3,612 Obligations of U.S. government agencies 397,411 343 (6,457 ) 391,297 U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 1,220,890 6,412 (13,601 ) 1,213,701 Private mortgage-backed securities 116 1 (1 ) 116 Other investments 2,951 21 — 2,972 Total $ 1,624,976 $ 6,782 $ (20,060 ) $ 1,611,698 December 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Held-to-Maturity: State, county and municipal securities $ 160,192 $ 2,723 $ (542 ) $ 162,373 Corporate securities 53,032 139 (211 ) 52,960 Obligations of U.S. government agencies 19,737 — (162 ) 19,575 U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 279,578 7,804 (9,249 ) 278,133 Other investments 231 1 — 232 Total $ 512,770 $ 10,667 $ (10,164 ) $ 513,273 Gross realized gains and losses from the disposition of investment securities are summarized in the following table: Three Months Ended March 31, 2017 2016 Gross realized gains $ 2 $ 57 Gross realized losses — (78 ) The following tables show the gross unrealized losses and fair values of investment securities, aggregated by investment category, and the length of time individual investment securities have been in a continuous unrealized loss position, as of March 31, 2017 and December 31, 2016 : Less than 12 Months 12 Months or More Total March 31, 2017 Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Available-for-Sale: U.S. Treasury notes $ 598 $ (1 ) $ — $ — $ 598 $ (1 ) Obligations of U.S. government agencies 324,693 (4,287 ) 9,984 (15 ) 334,677 (4,302 ) U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 652,089 (7,765 ) 23,282 (580 ) 675,371 (8,345 ) Private mortgage-backed securities — — 43 (1 ) 43 (1 ) Total $ 977,380 $ (12,053 ) $ 33,309 $ (596 ) $ 1,010,689 $ (12,649 ) Less than 12 Months 12 Months or More Total March 31, 2017 Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Held-to-Maturity: State, county and municipal securities $ 23,353 $ (218 ) $ 2,442 $ (4 ) $ 25,795 $ (222 ) U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 77,626 (7,816 ) 18,509 (1,270 ) 96,135 (9,086 ) Obligations of U.S. government agencies 19,655 (82 ) — — 19,655 (82 ) Corporate securities 16,061 (67 ) — — 16,061 (67 ) Total $ 136,695 $ (8,183 ) $ 20,951 $ (1,274 ) $ 157,646 $ (9,457 ) Less than 12 Months 12 Months or More Total December 31, 2016 Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Available-for-Sale: U.S. Treasury notes $ 598 $ (1 ) $ — $ — $ 598 $ (1 ) Obligations of U.S. government agencies 316,511 (6,457 ) — — 316,511 (6,457 ) U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 746,265 (13,102 ) 15,801 (499 ) 762,066 (13,601 ) Private mortgage-backed securities — — 48 (1 ) 48 (1 ) Total $ 1,063,374 $ (19,560 ) $ 15,849 $ (500 ) $ 1,079,223 $ (20,060 ) Less than 12 Months 12 Months or More Total December 31, 2016 Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Held-to-Maturity: State, county and municipal securities $ 42,518 $ (533 ) $ 2,831 $ (9 ) $ 45,349 $ (542 ) Obligations of U.S. government agencies 19,575 (162 ) — — 19,575 (162 ) U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 108,857 (7,973 ) 19,986 (1,276 ) 128,843 (9,249 ) Corporate securities 32,474 (211 ) — — 32,474 (211 ) Total $ 203,424 $ (8,879 ) $ 22,817 $ (1,285 ) $ 226,241 $ (10,164 ) The investment portfolio is evaluated quarterly for other-than-temporary declines in the market value of each individual investment security. The Company had 319 and 396 individual investment securities that were in an unrealized loss position as of March 31, 2017 and December 31, 2016 , respectively. As of March 31, 2017 , the Company had the intent and ability to hold these investment securities for a period of time sufficient to allow for an anticipated recovery. Furthermore, the Company does not have the intent to sell any of the available-for-sale securities in the above table and it is more likely than not that the Company will not have to sell any securities before a recovery in cost. No impairment losses were recorded during three months ended March 31, 2017 or 2016 . Maturities of investment securities at March 31, 2017 are shown below. Maturities of mortgage-backed securities have been adjusted to reflect shorter maturities based upon estimated prepayments of principal. All other investment securities maturities are shown at contractual maturity dates. Available-for-Sale Held-to-Maturity March 31, 2017 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Within one year $ 326,690 $ 326,645 $ 75,598 $ 76,786 After one year but within five years 1,108,186 1,105,388 278,753 278,372 After five years but within ten years 164,443 163,370 109,051 110,987 After ten years 62,193 62,188 27,566 27,780 Total $ 1,661,512 $ 1,657,591 $ 490,968 $ 493,925 As of March 31, 2017 , the Company had investment securities callable within one year with amortized costs and estimated fair values of $ 178,739 and $ 176,310 , respectively. These investment securities are primarily included in the after one year but within five years category in the table above. As of March 31, 2017 , the Company had callable structured notes with amortized costs and estimated fair values of $ 12,096 and $12,018 , respectively.

Loans

Loans	3 Months Ended
	Mar. 31, 2017
Receivables [Abstract]
Loans	Loans The following tables present the Company's recorded investment and contractual aging of the Company's recorded investment in loans by class as of the dates indicated. Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. Total Loans 30 - 59 60 - 89 > 90 30 or More Days Days Days Days Current Non-accrual Total As of March 31, 2017 Past Due Past Due Past Due Past Due Loans Loans Loans Real estate Commercial $ 4,936 $ 776 $ 322 $ 6,034 $ 1,784,284 $ 29,336 $ 1,819,654 Construction: Land acquisition & development 398 165 — 563 194,943 4,906 200,412 Residential 1,418 — 706 2,124 141,288 440 143,852 Commercial 231 — — 231 116,542 4,381 121,154 Total construction loans 2,047 165 706 2,918 452,773 9,727 465,418 Residential 7,487 463 1,091 9,041 988,838 6,166 1,004,045 Agricultural 1,014 — 322 1,336 164,724 1,689 167,749 Total real estate loans 15,484 1,404 2,441 19,329 3,390,619 46,918 3,456,866 Consumer: Indirect consumer 5,742 1,525 516 7,783 753,337 1,357 762,477 Other consumer 794 425 59 1,278 143,881 284 145,443 Credit card 628 264 630 1,522 63,719 — 65,241 Total consumer loans 7,164 2,214 1,205 10,583 960,937 1,641 973,161 Commercial 3,176 1,733 711 5,620 787,125 25,096 817,841 Agricultural 2,738 83 170 2,991 121,576 925 125,492 Other, including overdrafts — — — — 3,182 — 3,182 Loans held for investment 28,562 5,434 4,527 38,523 5,263,439 74,580 5,376,542 Mortgage loans originated for sale — — — — 23,237 — 23,237 Total loans $ 28,562 $ 5,434 $ 4,527 $ 38,523 $ 5,286,676 $ 74,580 $ 5,399,779 Total Loans 30 - 59 60 - 89 > 90 30 or More Days Days Days Days Current Non-accrual Total As of December 31, 2016 Past Due Past Due Past Due Past Due Loans Loans Loans Real estate Commercial $ 7,307 $ 1,099 $ 303 $ 8,709 $ 1,799,525 $ 26,211 $ 1,834,445 Construction: Land acquisition & development 633 352 279 1,264 202,223 5,025 208,512 Residential 931 264 — 1,195 146,245 456 147,896 Commercial — — — — 124,827 762 125,589 Total construction loans 1,564 616 279 2,459 473,295 6,243 481,997 Residential 3,986 1,280 702 5,968 1,014,990 6,435 1,027,393 Agricultural 341 287 — 628 165,293 4,327 170,248 Total real estate loans 13,198 3,282 1,284 17,764 3,453,103 43,216 3,514,083 Consumer: Indirect consumer 8,425 2,329 712 11,466 740,163 780 752,409 Other consumer 1,322 235 167 1,724 146,006 357 148,087 Credit card 504 333 567 1,404 68,366 — 69,770 Total consumer loans 10,251 2,897 1,446 14,594 954,535 1,137 970,266 Commercial 3,171 727 734 4,632 767,878 25,432 797,942 Agricultural 1,518 362 14 1,894 127,956 3,008 132,858 Other, including overdrafts — 1 311 312 1,289 — 1,601 Loans held for investment 28,138 7,269 3,789 39,196 5,304,761 72,793 5,416,750 Mortgage loans originated for sale — — — — 61,794 — 61,794 Total loans $ 28,138 $ 7,269 $ 3,789 $ 39,196 $ 5,366,555 $ 72,793 $ 5,478,544 Loans from business combinations included in the tables above include certain loans that had evidence of deterioration in credit quality since origination and for which it was probable, at acquisition, that all contractually required payments would not be collected. The following table displays the outstanding unpaid principal balance and accrual status of loans acquired with credit impairment as of March 31, 2017 and 2016 : As of March 31, 2017 2016 Outstanding balance $ 32,623 $ 33,175 Carrying value Loans on accrual status 18,920 21,064 Total carrying value $ 18,920 $ 21,064 The following table summarizes changes in the accretable yield for loans acquired credit impaired for the three months ended March 31, 2017 and 2016 : Three Months Ended March 31, 2017 2016 Beginning balance $ 6,803 $ 6,713 Additions — — Accretion income (605 ) (614 ) Reductions due to exit events (570 ) (147 ) Reclassifications from nonaccretable differences 804 726 Ending balance $ 6,432 $ 6,678 Acquired loans that met the criteria for nonaccrual of interest prior to acquisition were considered performing upon acquisition. If interest on non-accrual loans had been accrued, such income would have been approximately $ 874 and $ 790 for the three months ended March 31, 2017 and 2016 . The Company considers impaired loans to include all originated loans, except consumer loans, that are risk rated as doubtful, or have been placed on non-accrual status or renegotiated in troubled debt restructurings, and all loans acquired with evidence of deterioration in credit quality and for which it was probable, at acquisition, that the Company would be unable to collect all contractual amounts owed. The following tables present information on the Company’s recorded investment in impaired loans as of dates indicated: As of March 31, 2017 Unpaid Total Principal Balance Recorded Investment With No Allowance Recorded Investment With Allowance Total Recorded Investment Related Allowance Real estate: Commercial $ 55,648 $ 24,392 $ 20,218 $ 44,610 $ 4,105 Construction: Land acquisition & development 11,391 3,886 1,578 5,464 939 Residential 933 214 — 214 35 Commercial 4,734 228 4,267 4,495 2,870 Total construction loans 17,058 4,328 5,845 10,173 3,844 Residential 8,184 4,371 2,283 6,654 111 Agricultural 2,436 1,890 185 2,075 6 Total real estate loans 83,326 34,981 28,531 63,512 8,066 Commercial 40,135 14,760 18,319 33,079 7,176 Agricultural 1,188 691 464 1,155 223 Total $ 124,649 $ 50,432 $ 47,314 $ 97,746 $ 15,465 As of December 31, 2016 Unpaid Total Principal Balance Recorded Investment With No Allowance Recorded Investment With Allowance Total Recorded Investment Related Allowance Real estate: Commercial $ 57,017 $ 24,410 $ 21,420 $ 45,830 $ 2,847 Construction: Land acquisition & development 12,084 4,330 1,813 6,143 826 Residential 1,555 219 619 838 1 Commercial 4,786 3,940 647 4,587 657 Total construction loans 18,425 8,489 3,079 11,568 1,484 Residential 8,222 4,074 2,470 6,544 253 Agricultural 5,069 4,509 181 4,690 4 Total real estate loans 88,733 41,482 27,150 68,632 4,588 Commercial 40,314 13,230 19,167 32,397 9,254 Agricultural 3,738 3,280 382 3,662 112 Total $ 132,785 $ 57,992 $ 46,699 $ 104,691 $ 13,954 The following table presents the average recorded investment in and income recognized on impaired loans for the periods indicated: Three Months Ended March 31, 2017 2016 Average Recorded Investment Income Recognized Average Recorded Investment Income Recognized Real estate: Commercial $ 45,220 $ 125 $ 33,483 $ 36 Construction: Land acquisition & development 5,804 4 7,508 7 Residential 526 — 288 — Commercial 4,541 43 1,067 — Total construction loans 10,871 47 8,863 7 Residential 6,599 4 4,206 1 Agricultural 3,383 — 5,748 1 Total real estate loans 66,073 176 52,300 45 Commercial 32,738 49 23,379 15 Agricultural 2,409 2 856 — Total $ 101,220 $ 227 $ 76,535 $ 60 The amount of interest income recognized by the Company within the period that the loans were impaired was primarily related to loans modified in a troubled debt restructuring that remained on accrual status. Interest payments received on non-accrual impaired loans are applied to principal. Interest income is subsequently recognized only to the extent cash payments are received in excess of principal due. If interest on impaired loans had been accrued, interest income on impaired loans would have been approximately $ 874 and $ 790 for the three months ended March 31, 2017 and 2016 . Collateralized impaired loans are generally recorded at the fair value of the underlying collateral using discounted cash flows, independent appraisals and management estimates based upon current market conditions. For loans measured under the present value of cash flows method, the change in present value attributable to the passage of time, if applicable, is recognized in the provision for loan losses and thus no interest income is recognized. Modifications of performing loans are made in the ordinary course of business and are completed on a case-by-case basis as negotiated with the borrower. Loan modifications typically include interest rate changes, interest only periods of less than twelve months, short-term payment deferrals and extension of amortization periods to provide payment relief. A loan modification is considered a troubled debt restructuring if the borrower is experiencing financial difficulties and the Company, for economic or legal reasons, grants a concession to the borrower that it would not otherwise consider. Certain troubled debt restructurings are on non-accrual status at the time of restructuring and may be returned to accrual status after considering the borrower's sustained repayment performance in accordance with the restructuring agreement for a period of at least six months and management is reasonably assured of future performance. If the troubled debt restructuring meets these performance criteria and the interest rate granted at the modification is equal to or greater than the rate that the Company was willing to accept at the time of the restructuring for a new loan with comparable risk, then the loan will return to performing status and the accrual of interest will resume, although they continue to be individually evaluated for impairment and disclosed as impaired loans. The Company had loans renegotiated in troubled debt restructurings of $ 55,255 as of March 31, 2017 , of which $ 38,876 were included in non-accrual loans and $ 16,379 were on accrual status. The Company had loans renegotiated in troubled debt restructurings of $ 49,652 as of December 31, 2016 , of which $ 27,309 were included in non-accrual loans and $ 22,343 were on accrual status. The following table presents information on the Company's troubled debt restructurings that occurred during the three months ended March 31, 2017 : Number of Notes Type of Concession Principal Balance at Restructure Date Three Months Ended March 31, 2017 Interest only period Extension of term or amortization schedule Interest rate adjustment Other (1) Commercial real estate 4 $ 1,475 $ 162 $ — $ 909 $ 2,546 Commercial 13 495 1,968 — 4,981 7,444 Total loans restructured during period 17 $ 1,970 $ 2,130 $ — $ 5,890 $ 9,990 (1) Other includes concessions that reduce or defer payments for a specified period of time and/or concessions that do not fit into other designated categories. For troubled debt restructurings that were on non-accrual status or otherwise deemed impaired before the modification, a specific reserve may already be recorded. In periods subsequent to modification, the Company continues to evaluate all troubled debt restructurings for possible impairment and recognizes impairment through the allowance. Additionally these loans continue to work their way through the credit cycle through charge-off, pay-off or foreclosure. Financial effects of modifications of troubled debt restructurings may include principal loan forgiveness or other charge-offs directly related to the restructuring. The Company had no charge-offs directly related to modifying troubled debt restructurings during the three months ended March 31, 2017 or 2016 . The Company had no troubled debt restructurings during the previous 12 months for which there was a payment default during the three months ended March 31, 2017 . The Company considers a payment default to occur on troubled debt restructurings when the loan is 90 days or more past due or was placed on non-accrual status after the modification. At March 31, 2017 , there were no material commitments to lend additional funds to borrowers whose existing loans have been renegotiated or are classified as non-accrual. As part of the on-going and continuous monitoring of the credit quality of the Company’s loan portfolio, management tracks internally assigned risk classifications of loans. The Company adheres to a Uniform Classification System developed jointly by the various bank regulatory agencies to internally risk rate loans. The Uniform Classification System defines three broad categories of criticized assets, which the Company uses as credit quality indicators: Other Assets Especially Mentioned — includes loans that exhibit weaknesses in financial condition, loan structure or documentation, which if not promptly corrected, may lead to the development of abnormal risk elements. Substandard — includes loans that are inadequately protected by the current sound worth and paying capacity of the borrower. Although the primary source of repayment for a substandard loan is not currently sufficient, collateral or other sources of repayment are sufficient to satisfy the debt. Continuance of a substandard loan is not warranted unless positive steps are taken to improve the worthiness of the credit. Doubtful — includes loans that exhibit pronounced weaknesses to a point where collection or liquidation in full, on the basis of currently existing facts, conditions and values, is highly questionable and improbable. Doubtful loans are required to be placed on non-accrual status and are assigned specific loss exposure. Company management undertakes the same process for assigning risk ratings to acquired loans as it does for originated loans. Acquired loans rated as substandard or lower or that were on non-accrual status or designated as troubled debt restructurings at the time of acquisition are deemed to be acquired credit impaired loans accounted for under Accounting Standards Codification Topic 310-30, regardless of whether they are classified as performing or non-performing loans. The following tables present the Company’s recorded investment in criticized loans by class and credit quality indicator based on the most recent analysis performed as of the dates indicated: As of March 31, 2017 Other Assets Especially Mentioned Substandard Doubtful Total Criticized Loans Real estate: Commercial $ 73,394 $ 90,127 $ 12,118 $ 175,639 Construction: Land acquisition & development 16,793 6,754 1,400 24,947 Residential 2,043 2,724 620 5,387 Commercial 1,494 3,385 4,284 9,163 Total construction loans 20,330 12,863 6,304 39,497 Residential 4,616 11,766 922 17,304 Agricultural 4,595 14,517 — 19,112 Total real estate loans 102,935 129,273 19,344 251,552 Consumer: Indirect consumer 471 2,096 76 2,643 Other consumer 586 962 213 1,761 Credit card — 127 — 127 Total consumer loans 1,057 3,185 289 4,531 Commercial 33,368 54,963 18,029 106,360 Agricultural 7,446 12,926 747 21,119 Total $ 144,806 $ 200,347 $ 38,409 $ 383,562 As of December 31, 2016 Other Assets Especially Mentioned Substandard Doubtful Total Criticized Loans Real estate: Commercial $ 85,292 $ 85,293 $ 10,842 $ 181,427 Construction: Land acquisition & development 13,414 6,214 1,401 21,029 Residential 412 1,621 656 2,689 Commercial 1,555 6,344 664 8,563 Total construction loans 15,381 14,179 2,721 32,281 Residential 5,038 12,472 764 18,274 Agricultural 3,831 17,813 — 21,644 Total real estate loans 109,542 129,757 14,327 253,626 Consumer: Indirect consumer 778 1,527 101 2,406 Other consumer 681 1,036 264 1,981 Total consumer loans 1,459 2,563 365 4,387 Commercial 46,402 29,281 21,240 96,923 Agricultural 6,178 10,724 404 17,306 Total $ 163,581 $ 172,325 $ 36,336 $ 372,242 The Company maintains a credit review function, which is independent of the credit approval process, to assess assigned internal risk classifications and monitor compliance with internal lending policies and procedures. Written action plans with firm target dates for resolution of identified problems are maintained and reviewed on a quarterly basis for all categories of criticized loans.

Allowance For Loan Losses

Allowance For Loan Losses	3 Months Ended
	Mar. 31, 2017
Receivables [Abstract]
Allowance For Loan Losses	The following tables present a summary of changes in the allowance for loan losses by portfolio segment for the periods indicated: Three Months Ended March 31, 2017 Real Estate Consumer Commercial Agriculture Other Total Allowance for loan losses: Beginning balance $ 28,625 $ 7,711 $ 38,092 $ 1,786 $ — $ 76,214 Provision charged to operating expense 4,387 2,048 (4,128 ) (577 ) — 1,730 Less loans charged-off (444 ) (2,596 ) (793 ) (22 ) — (3,855 ) Add back recoveries of loans previously charged-off 524 1,205 391 22 — 2,142 Ending balance $ 33,092 $ 8,368 $ 33,562 $ 1,209 $ — $ 76,231 As of March 31, 2017 Real Estate Consumer Commercial Agriculture Other Total Allowance for loan losses: Loans individually evaluated for impairment $ 8,066 $ — $ 7,176 $ 223 $ — $ 15,465 Loans collectively evaluated for impairment 25,026 8,368 26,386 986 — 60,766 Allowance for loan losses $ 33,092 $ 8,368 $ 33,562 $ 1,209 $ — $ 76,231 Loans held for investment: Individually evaluated for impairment $ 63,512 $ — $ 33,079 $ 1,155 $ — $ 97,746 Collectively evaluated for impairment 3,393,354 973,161 784,762 124,337 3,182 5,278,796 Total loans $ 3,456,866 $ 973,161 $ 817,841 $ 125,492 $ 3,182 $ 5,376,542 Three Months Ended March 31, 2016 Real Estate Consumer Commercial Agriculture Other Total Allowance for loan losses: Beginning balance $ 52,296 $ 5,144 $ 18,775 $ 602 $ — $ 76,817 Provision charged to operating expense (16,081 ) 1,229 17,690 1,162 — 4,000 Less loans charged-off (1,922 ) (1,892 ) (488 ) — — (4,302 ) Add back recoveries of loans previously charged-off 2,359 775 275 — — 3,409 Ending balance $ 36,652 $ 5,256 $ 36,252 $ 1,764 $ — $ 79,924 As of December 31, 2016 Real Estate Consumer Commercial Agriculture Other Total Allowance for loan losses: Loans individually evaluated for impairment $ 4,588 $ — $ 9,254 $ 112 $ — $ 13,954 Loans collectively evaluated for impairment 24,037 7,711 28,838 1,674 — 62,260 Allowance for loan losses $ 28,625 $ 7,711 $ 38,092 $ 1,786 $ — $ 76,214 Loans held for investment: Individually evaluated for impairment $ 68,632 $ — $ 32,397 $ 3,662 $ — $ 104,691 Collectively evaluated for impairment 3,445,451 970,266 765,545 129,196 1,601 5,312,059 Total loans $ 3,514,083 $ 970,266 $ 797,942 $ 132,858 $ 1,601 $ 5,416,750 The Company performs a quarterly assessment of the adequacy of its allowance for loan losses in accordance with generally accepted accounting principles. The methodology used to assess the adequacy is consistently applied to the Company's loan portfolio and consists of three elements: (1) specific valuation allowances based on probable losses on impaired loans; (2) historical valuation allowances based on loan loss experience for similar loans with similar characteristics and trends; and (3) general valuation allowances determined based on changes in the nature of the loan portfolio, overall portfolio quality, industry concentrations, delinquency trends, general economic conditions and other qualitative risk factors both internal and external to the Company. Specific allowances are established for loans where management has determined that probability of a loss exists by analyzing the borrower’s ability to repay amounts owed, collateral deficiencies and any relevant qualitative or economic factors impacting the loan. Historical valuation allowances are determined by applying percentage loss factors to the credit exposures from outstanding loans. For commercial, agricultural and real estate loans, loss factors are applied based on the internal risk classifications of these loans. For consumer loans, loss factors are applied on a portfolio basis. For commercial, agriculture and real estate loans, loss factor percentages are based on a migration analysis of our historical loss experience, designed to account for credit deterioration. For consumer loans, loss factor percentages are based on a one-year loss history. General valuation allowances are determined by evaluating, on a quarterly basis, changes in the nature and volume of the loan portfolio, overall portfolio quality, industry concentrations, current economic and regulatory conditions and the estimated impact of these factors on historical loss rates. An allowance for loan losses is established for loans acquired credit impaired and for which the Company projects a decrease in the expected cash flows in periods subsequent to the acquisition of such loans. As of March 31, 2017 and December 31, 2016 , the Company's allowance for loan losses included $565 and $427 , respectively, related to loans acquired credit impaired.

OREO

OREO	3 Months Ended
	Mar. 31, 2017
Repossessed Assets [Abstract]
Other Real Estate Owned	Other Real Estate Owned Information with respect to the Company's other real estate owned follows: Three Months Ended March 31, 2017 2016 Beginning balance $ 10,019 $ 6,254 Additions 368 3,227 Valuation adjustments (47 ) (17 ) Dispositions (912 ) (207 ) Ending balance $ 9,428 $ 9,257 The carrying values of foreclosed residential real estate properties included in other real estate owned were $ 2,538 and $2,282 as of March 31, 2017 and December 31, 2016, respectively. The Company did not have any consumer mortgage loans collateralized by residential real estate property that were in the process of foreclosure as of March 31, 2017 or December 31, 2016.

Derivatives and Hedging

Derivatives and Hedging	3 Months Ended
	Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Text Block]	Derivatives and Hedging Activities For asset and liability management purposes, the Company has entered into an interest rate swap contract to hedge against changes in forecasted cash flows due to interest rate exposures. The swap agreement is a derivative instrument and converts a portion of the Company’s forecasted variable rate debt to a fixed rate (i.e., cash flow hedge) over the payment term of the interest rate swap. The effective portion of the gain or loss on cash flow hedging instruments is initially reported as a component of other comprehensive income and subsequently reclassified into earnings in the same period during which the transaction affects earnings. The ineffective portion of the gain or loss on derivative instruments, if any, is recognized in earnings. The Company does not enter into interest rate swap agreements for trading or speculative purposes. The Company also enters into certain interest rate swap contracts that are not designated as hedging instruments. These derivative contracts relate to transactions in which the Company enters into an interest rate swap with a customer while at the same time entering into an offsetting interest rate swap with a third party financial institution. Because the Company acts as an intermediary for the customer, changes in the fair value of the underlying derivative contracts for the most part offset each other and do not significantly impact the Company's results of operations. In the normal course of business, the Company enters into interest rate lock commitments to finance residential mortgage loans that are not designated as accounting hedges. These commitments, which contain fixed expiration dates, offer the borrower an interest rate guarantee provided the loan meets underwriting guidelines and closes within the timeframe established by the Company. Interest rate risk arises on these commitments and subsequently closed loans if interest rates change between the time of the interest rate lock and the delivery of the loan to the investor. Loan commitments related to residential mortgage loans intended to be sold are considered derivatives and are marked to market through earnings. In addition to the effects of the change in market interest rate, the fair value measurement of the derivative also contemplates the expected cash flows to be received from the counterparty from the future sale of the loan. The Company sells residential mortgage loans on either a best efforts or mandatory delivery basis. The Company mitigates the effect of the interest rate risk inherent in providing interest rate lock commitments by entering into forward loan sales contracts. During the interest rate lock commitment period, these forward loan sales contracts are marked to market through earnings and are not designated as accounting hedges. Exclusive of the fair value component associated with the projected cash flows from the loan delivery to the investor, the changes in fair value related to movements in market rates of the interest rate lock commitments and the forward loan sales contracts generally move in opposite directions, and the net impact of changes in these valuations on net income during the loan commitment period is generally inconsequential. When the loan is funded to the borrower, the interest rate lock commitment derivative expires and the Company records a loan held for sale. The forward loan sales contract acts as a hedge against the variability in cash to be received from the loan sale. The changes in measurement of the estimated fair values of the interest rate lock commitments and forward loan sales contracts are included in mortgage banking revenues in the accompanying consolidated statements of income. The notional amounts and estimated fair values of the Company's derivatives are presented in the following table. Fair value estimates are obtained from third parties and are based on pricing models. March 31, 2017 December 31, 2016 Notional Amount Estimated Fair Value Notional Amount Estimated Fair Value Derivative Assets (included in other assets): Derivatives designated as hedges: Interest rate swap contracts $ 100,000 $ 16 $ — $ — Non-hedging interest rate derivatives: Interest rate swap contracts 53,188 1,295 53,593 1,332 Interest rate lock commitments 61,915 1,712 73,422 1,131 Forward loan sales contracts — — 126,836 286 Total derivative assets $ 215,103 $ 3,023 $ 253,851 $ 2,749 Derivative Liabilities (included in accounts payable and accrued expenses): Derivatives designated as hedges: Interest rate swap contracts $ — $ — $ 100,000 $ 33 Non-hedging interest rate derivatives: Interest rate swap contracts 53,188 1,283 53,593 1,281 Forward loan sales contracts 84,004 405 — — Total derivative liabilities $ 137,192 $ 1,688 $ 153,593 $ 1,314 On September 22, 2015 , the Company entered into an interest rate swap contract with a notional amount of $100,000 that was designated as a cash flow hedge. Under the terms of the interest rate swap contract, the Company pays a fixed interest rate of 1.94% and the counterparty pays to the Company a variable interest rate equal to the three-month LIBOR. No cash is exchanged until the effective date, which begins on September 15, 2017 and ends on September 15, 2020 . The Company designated the interest payments related to Federal Home Loan Bank borrowings as the cash flow hedge. The hedge was fully effective during the current period. As such, no amount of ineffectiveness was included in the Company's income statement for the three months ended March 31, 2017 . The Company expects the hedge to remain highly effective during the remaining term of the interest rate swap. The following table presents the pre-tax gains or losses related to derivative contracts that were recorded in accumulated other comprehensive income and other non-interest income in the Company's statements of income for the periods indicated: Three Months Ended March 31, 2017 2016 Derivatives designated as hedges: Amount of gain (loss) recognized in other comprehensive income (effective portion) $ 49 $ (2,197 ) Non-hedging interest rate derivatives: Amount of loss recognized in other non-interest income (39 ) (29 ) Amount of net fee expense recognized in other non-interest income (42 ) — Amount of net gains (losses) recognized in mortgage banking revenues (109 ) 695

Capital Stock

Capital Stock	3 Months Ended
	Mar. 31, 2017
Equity [Abstract]
Common Stock	Capital Stock The Company had 21,926,590 shares of Class A common stock and 23,217,418 shares of Class B common stock outstanding as of March 31, 2017 . The Company had 21,613,885 shares of Class A common stock and 23,312,291 shares of Class B common stock outstanding as of December 31, 2016 . During the three months ended March 31, 2017 , the Company did not repurchase any shares of its Class A common stock. During the three months ended March 31, 2016 , the Company repurchased and retired 948,242 shares of its Class A common stock in open market transactions at an aggregate purchase price of $24,792 . All repurchases were made pursuant to stock repurchase programs approved by the Company's Board of Directors. Under the terms of the current stock repurchase program, the Company may repurchase up to an additional 24,123 shares of its Class A common stock. All other stock repurchases during the three months ended March 31, 2017 and 2016 were redemptions of vested restricted shares tendered in lieu of cash for payment of income tax withholding amounts by participants in the Company's equity compensation plans.

Earnings per Common Share

Earnings per Common Share	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Earnings per Common Share	Earnings per Common Share Basic earnings per common share is calculated by dividing net income by the weighted average number of common shares outstanding during the period presented, excluding unvested restricted stock. Diluted earnings per share is calculated by dividing net income by the weighted average number of common shares determined for the basic earnings per share computation plus the dilutive effects of stock-based compensation using the treasury stock method. The following table sets forth the computation of basic and diluted earnings per share for the three month periods ended March 31, 2017 and 2016 : Three Months Ended March 31, 2017 2016 Net income $ 23,126 $ 20,124 Weighted average common shares outstanding for basic earnings per share computation 44,680,258 44,719,218 Dilutive effects of stock-based compensation 558,650 394,834 Weighted average common shares outstanding for diluted earnings per common share computation 45,238,908 45,114,052 Basic earnings per common share $ 0.52 $ 0.45 Diluted earnings per common share $ 0.51 $ 0.45 Anti-dilutive unvested time restricted stock 96,897 40,865 The Company had 187,680 and 226,821 shares of unvested restricted stock as of March 31, 2017 and 2016 , respectively, that were not included in the computation of diluted earnings per common share because performance conditions for vesting had not been met.

Regulatory Capital

Regulatory Capital	3 Months Ended
	Mar. 31, 2017
Banking and Thrift [Abstract]
Regulatory Capital	Regulatory Capital On July 2, 2013, the Board of Governors of the Federal Reserve Bank issued a final rule implementing a revised regulatory capital framework for U.S. banks in accordance with the Basel III international accord, ("Basel III"). Basel III includes a more stringent definition of capital and introduces a new common equity tier 1, or CET1, capital requirement, sets forth a comprehensive methodology for calculating risk-weighted assets, introduces a conservation buffer and sets out minimum capital ratios and overall capital adequacy standards. Under Basel III, certain deductions and adjustments to regulatory capital began to phase in starting January 1, 2015 and will be fully implemented on January 1, 2018. The capital conservation buffer required under Basel III began to phase in starting January 1, 2016 and will be fully implemented on January 1, 2019. As of March 31, 2017 and December 31, 2016 , the Company exceeded all capital adequacy requirements to which it is subject. Actual capital amounts and ratios for the Company and its bank subsidiary, as of March 31, 2017 and December 31, 2016 are presented in the following tables: Actual Adequately Capitalized Basel III Phase-In Schedule Adequately Capitalized Basel III Fully Phased-In Well Capitalized (1) Amount Ratio Amount Ratio Amount Ratio Amount Ratio March 31, 2017 Total risk-based capital: Consolidated $ 957,008 14.94 % $ 592,579 9.25 % $ 672,658 10.5 % $ 640,626 10.0 % FIB 861,953 13.52 589,927 9.25 669,646 10.5 637,759 10.0 Tier 1 risk-based capital: Consolidated 880,777 13.75 464,454 7.25 544,532 8.5 512,501 8.0 FIB 785,722 12.32 462,375 7.25 542,095 8.5 510,207 8.0 Common equity tier 1 risk-based capital: Consolidated 800,777 12.50 368,360 5.75 448,438 7.0 416,407 6.5 FIB 785,722 12.32 366,711 5.75 446,431 7.0 414,543 6.5 Leverage capital ratio: Consolidated 880,777 10.09 349,244 4.00 349,244 4.0 436,555 5.0 FIB 785,722 9.02 348,525 4.00 348,525 4.0 435,656 5.0 Actual Adequately Capitalized Basel III Phase-In Schedule Adequately Capitalized Basel III Fully Phased-In Well Capitalized (1) Amount Ratio Amount Ratio Amount Ratio Amount Ratio December 31, 2016 Total risk-based capital: Consolidated $ 974,488 15.13 % $ 555,665 8.63 % $ 676,070 10.5 % $ 643,876 10.0 % FIB 841,967 13.13 553,459 8.63 673,386 10.5 641,320 10.0 Tier 1 risk-based capital: Consolidated 894,273 13.89 426,890 6.63 547,295 8.5 $ 515,101 8.0 FIB 765,753 11.94 425,195 6.63 545,122 8.5 513,056 8.0 Common equity tier 1 risk-based capital: Consolidated 814,273 12.65 330,308 5.13 450,713 7.0 $ 418,519 6.5 FIB 765,753 11.94 328,997 5.13 448,924 7.0 416,858 6.5 Leverage capital ratio: Consolidated 894,273 10.11 353,838 4.00 353,838 4.0 $ 442,297 5.0 FIB 765,753 8.69 352,283 4.00 352,283 4.0 440,353 5.0 (1) The ratios for the well capitalized requirement are only applicable to FIB. However, the Company manages its capital position as if the requirement applies to the consolidated entity and has presented the ratios as if they also applied on a consolidated basis.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies In the normal course of business, the Company is involved in various other claims and litigation. In the opinion of management, following consultation with legal counsel, the ultimate liability or disposition thereof of all other claims and litigation is not expected to have a material adverse effect on the consolidated financial condition, results of operations or liquidity of the Company. As of March 31, 2017 , the Company had a commitment under a forward starting interest rate swap contract with a notional amount of $ 100,000 . For additional information about the forward starting interest rate swap contract, see Note 7 — Derivatives and Hedging Activity. As of March 31, 2017 , the Company had commitments under construction contracts of $2,515 . Residential mortgage loans sold to investors in the secondary market are sold with varying recourse provisions. Essentially all of the loan sales agreements require the repurchase of a mortgage loan by the seller in situations such as breach of representation, warranty or covenant; untimely document delivery; false or misleading statements; failure to obtain certain certificates or insurance; unmarketability; etc. Certain loan sales agreements contain repurchase requirements based on payment-related defects that are defined in terms of the number of days or months since the purchase, the sequence number of the payment, and/or the number of days of payment delinquency. Based on the specific terms stated in the agreements, the Company had $ 1,127 of sold residential mortgage loans with recourse provisions still in effect as of March 31, 2017 .

Financial Instruments with Off-

Financial Instruments with Off-Balance Sheet Risk	3 Months Ended
	Mar. 31, 2017
Financial Instruments with Off-Balance Sheet Risk [Abstract]
Financial Instruments with Off-Balance Sheet Risk	Financial Instruments with Off-Balance Sheet Risk The Company is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the commitment contract. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. At March 31, 2017 , commitments to extend credit to existing and new borrowers approximated $ 1,596,930 , which included $ 550,354 on unused credit card lines and $ 416,411 with commitment maturities beyond one year. Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. At March 31, 2017 , the Company had outstanding standby letters of credit of $ 50,022 . The estimated fair value of the obligation undertaken by the Company in issuing the standby letters of credit is included in other liabilities in the Company’s consolidated balance sheet.

Other Comprehensive Income

Other Comprehensive Income	3 Months Ended
	Mar. 31, 2017
Equity [Abstract]
Other Comprehensive Income	Other Comprehensive Income/Loss The gross amounts of each component of other comprehensive income and the related tax effects are as follows: Pre-tax Tax (Expense) Benefit Net of Tax Three Months Ended March 31, 2017 2016 2017 2016 2017 2016 Investment securities available-for sale: Change in net unrealized gains during period $ 9,354 $ 8,613 $ 3,681 $ 3,360 $ 5,673 $ 5,253 Reclassification adjustment for net (gains) losses included in net income (2 ) 21 (1 ) 8 (1 ) 13 Change in unamortized loss on available- for-sale securities transferred into held-to- maturity 463 465 182 183 281 282 Unrealized (gain) loss on derivatives 49 (2,197 ) 19 (835 ) 30 (1,362 ) Defined benefits post-retirement benefit plan: Change in net actuarial (gain) loss (739 ) 15 (291 ) 6 (448 ) 9 Total other comprehensive income $ 9,125 $ 6,917 $ 3,590 $ 2,722 $ 5,535 $ 4,195 The components of accumulated other comprehensive loss, net of related tax effects, are as follows: March 31, December 31, Net unrealized loss on investment securities available-for-sale $ (4,190 ) $ (10,143 ) Net unrealized gain on derivatives 1,590 2,038 Net actuarial gain (loss) on defined benefit post-retirement benefit plans 7 (23 ) Net accumulated other comprehensive loss $ (2,593 ) $ (8,128 )

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. There is a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The three levels of inputs that may be used to measure fair value are as follows: • Level 1 - Quoted prices in active markets for identical assets or liabilities • Level 2 - Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities • Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of of assets or liabilities The methodologies used by the Company in determining the fair values of each class of financial instruments are based primarily on the use of independent, market-based data to reflect a value that would be reasonably expected in an orderly transaction between market participants at the measurement date, and therefore are classified within Level 2 of the valuation hierarchy. There were no transfers between fair value hierarchy levels during the three months ended March 31, 2017 and 2016 . Further details on the methods used to estimate the fair value of each class of financial instruments above are discussed below: Investment Securities Available-for-Sale . The Company obtains fair value measurements for investment securities from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the investment's terms and conditions, among other things. Vendors chosen by the Company are widely recognized vendors whose evaluations support the pricing functions of financial institutions, investment and mutual funds, and portfolio managers. If needed, a broker may be utilized to determine the reported fair value of investment securities. Loans Held for Sale. Fair value measurements for loans held for sale are obtained from an independent pricing service. The fair value measurements consider observable data that may include binding contracts or quotes or bids from third party investors as well as loan level pricing adjustments. Interest Rate Swap Contracts. Fair values for derivative interest rate swap contracts are based upon the estimated amounts to settle the contracts considering current interest rates and are calculated using discounted cash flows that are observable or that can be corroborated by observable market data. The inputs used to determine fair value include the 3 month LIBOR forward curve to estimate variable rate cash inflows and the federal funds effective swap rate to estimate the discount rate. The estimated variable rate cash inflows are compared to the fixed rate outflows and such difference is discounted to a present value to estimate the fair value of the interest rate swaps. The change in the value of derivative assets attributable to basis risk, or the risk that offsetting investments in a hedging strategy will not experience price changes in entirely opposite directions from each other, was not significant in the reported periods. The Company also obtains and compares the reasonableness of the pricing from an independent third party. Interest Rate Lock Commitments. Fair value measurements for interest rate lock commitments are obtained from an independent pricing service. The fair value measurements consider observable data that may include prices available from secondary market investors taking into consideration various characteristics of the loan, including the loan amount, interest rate, value of the servicing and loan to value ratio, among other things. Observable data is then adjusted to reflect changes in interest rates, the Company's estimated pull-through rate and estimated direct costs necessary to complete the commitment into a closed loan net of origination and processing fees collected from the borrower. Forward Loan Sales Contracts. The fair value measurements for forward loan sales contracts are obtained from an independent pricing service. The fair value measurements consider observable data that includes sales of similar loans. Deferred Compensation Plan Assets and Liabilities. The fair values of deferred compensation plan assets are based primarily on the use of independent, market-based data to reflect a value that would be reasonably expected in an orderly transaction between market participants at the measurement date. These investments are in the same funds and purchased in the same amounts as the participants’ selected investments, which represent the underlying liabilities to plan participants. Deferred compensation plan liabilities are recorded at amounts due to participants, based on the fair value of participants’ selected investments. Financial assets and financial liabilities measured at fair value on a recurring basis are as follows: Fair Value Measurements at Reporting Date Using As of March 31, 2017 Balance Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Investment securities available-for-sale: U.S. Treasury Notes $ 3,612 $ — $ 3,612 $ — Obligations of U.S. government agencies 407,243 — 407,243 — U.S. agencies mortgage-backed securities & collateralized mortgage obligations 1,243,663 — 1,243,663 — Private mortgage-backed securities 106 — 106 — Other investments 2,967 — 2,967 — Loans held for sale 23,237 — 23,237 — Derivative assets: Interest rate swap contracts 1,311 — 1,311 — Interest rate lock commitments 1,712 — 1,712 — Derivative liabilities: Interest rate swap contracts 1,283 — 1,283 — Forward loan sale contracts 405 — 405 — Deferred compensation plan assets 11,108 — 11,108 — Deferred compensation plan liabilities 11,108 — 11,108 — Fair Value Measurements at Reporting Date Using As of December 31, 2016 Balance Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Investment securities available-for-sale: U.S. Treasury notes $ 3,612 $ — $ 3,612 $ — Obligations of U.S. government agencies 391,297 — 391,297 — U.S. agencies mortgage-backed securities & collateralized mortgage obligations 1,213,701 — 1,213,701 — Private mortgage-backed securities 116 — 116 — Other investments 2,972 — 2,972 — Loans held for sale 61,794 — 61,794 — Derivative assets: Interest rate swap contracts 1,332 — 1,332 — Interest rate lock commitments 1,131 — 1,131 — Forward loan sales contracts 286 — 286 — Derivative liabilities Interest rate swap contracts 1,314 — 1,314 — Deferred compensation plan assets 10,627 — 10,627 — Deferred compensation plan liabilities 10,627 — 10,627 — Additionally, from time to time, certain assets are measured at fair value on a non-recurring basis. Adjustments to fair value generally result from the application of lower-of-cost-or-market accounting or write-downs of individual assets due to impairment. The following table presents information about the Company’s assets and liabilities measured at fair value on a non-recurring basis: Fair Value Measurements at Reporting Date Using As of March 31, 2017 Balance Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Impaired loans $ 37,484 $ — $ — $ 37,484 Other real estate owned 1,682 — — 1,682 Long-lived assets to be disposed of by sale 356 — — 356 Fair Value Measurements at Reporting Date Using As of December 31, 2016 Balance Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Impaired loans $ 39,344 $ — $ — $ 39,344 Other real estate owned 2,110 — — 2,110 Long-lived assets to be disposed of by sale 1,335 — — 1,335 Impaired Loans. Collateralized impaired loans are reported at the fair value of the underlying collateral if repayment is expected solely from collateral. The impaired loans are reported at fair value through specific valuation allowance allocations. In addition, when it is determined that the fair value of an impaired loan is less than the recorded investment in the loan, the carrying value of the loan is adjusted to fair value through a charge to the allowance for loan losses. Collateral values are estimated using independent appraisals and management estimates of current market conditions. As of March 31, 2017 , certain impaired loans with a carrying value of $ 63,304 were reduced by specific valuation allowance allocations of $ 14,901 and partial loan charge-offs of $ 10,919 resulting in a reported fair value of $ 37,484 . As of December 31, 2016 , certain impaired loans with a carrying value of $ 65,238 were reduced by specific valuation allowance allocations of $ 13,954 and partial loan charge-offs of $ 11,941 resulting in a reported fair value of $ 39,344 . OREO. The fair values of OREO are estimated using independent appraisals and management estimates of current market conditions. Upon initial recognition, write-downs based on the foreclosed asset's fair value at foreclosure are reported through charges to the allowance for loan losses. Periodically, the fair value of foreclosed assets is remeasured with any subsequent write-downs charged to OREO expense in the period in which they are identified. Write-downs of $47 during the three months ended March 31, 2017 included $16 directly related to receipt of updated appraisals and $ 31 based on management estimates of the current fair value of properties. Write downs of $17 during the three months ended March 31, 2016 included $11 directly related to receipt of updated appraisals and $ 6 based on management estimates of the current fair value of properties. Long-lived Assets to be Disposed of by Sale. Long-lived assets to be disposed of by sale are carried at the lower of carrying value or fair value less estimated costs to sell. The fair values of long-lived assets to be disposed of by sale are based upon observable market data and management estimates of current market conditions. As of March 31, 2017 , the Company had a long-lived asset to be disposed of by sale with a carrying value of $565 that was reduced by write-downs of $209 , resulting in a fair value of $356 . As of December 31, 2016 , the Company had long-lived assets to be disposed of by sale with carrying values aggregating $2,363 that were reduced by write-downs of $1,028 resulting in an aggregate fair value of $1,335 . The following table presents additional quantitative information about assets measured at fair value on a non-recurring basis and for which the Company has utilized Level 3 inputs to determine fair values: Fair Value As of March 31, 2017 December 31, 2016 Valuation Technique Unobservable Inputs Range (Weighted Average) Impaired loans $ 37,484 $ 39,344 Appraisal Appraisal adjustment 0% - 66% (31%) Other real estate owned 1,682 2,110 Appraisal Appraisal adjustment 8% - 96% (18%) Long-lived assets to be disposed of by sale 356 1,335 Appraisal Appraisal adjustment 0% - 9% (6%) The Company is required to disclose the fair value of financial instruments for which it is practical to estimate fair value. The methodologies for estimating the fair value of financial instruments that are measured at fair value on a recurring or non-recurring basis are discussed above. The methodologies for estimating the fair value of other financial instruments are discussed below. For financial instruments bearing a variable interest rate where no credit risk exists, it is presumed that recorded book values are reasonable estimates of fair value. Financial Assets. Carrying values of cash, cash equivalents and accrued interest receivable approximate fair values due to the liquid and/or short-term nature of these instruments. Fair values for investment securities held-to-maturity are obtained from an independent pricing service, which considers observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the investment’s terms and conditions, among other things. Fair values of fixed rate loans and variable rate loans that reprice on an infrequent basis are estimated by discounting future cash flows using current interest rates at which similar loans with similar terms would be made to borrowers of similar credit quality. Carrying values of variable rate loans that reprice frequently, and with no change in credit risk, approximate the fair values of these instruments. Financial Liabilities. The fair values of demand deposits, savings accounts, securities sold under repurchase agreements and accrued interest payable are the amounts payable on demand at the reporting date. The fair values of fixed-maturity certificates of deposit are estimated using external market rates currently offered for deposits with similar remaining maturities. The fair values of derivative liabilities are obtained from an independent pricing service, which considers observable data that may include the three-month LIBOR forward curve, the federal funds effective swap rate and cash flows, among other things. The carrying values of the interest bearing demand notes to the United States Treasury are deemed an approximation of fair values due to the frequent repayment and repricing at market rates. The fixed and floating rate subordinated debentures, floating rate subordinated term loan, notes payable to the FHLB, fixed rate subordinated term debt, and capital lease obligation are estimated by discounting future cash flows using current rates for advances with similar characteristics. Commitments to Extend Credit and Standby Letters of Credit. The fair value of commitments to extend credit and standby letters of credit, based on fees currently charged to enter into similar agreements, is not significant. The estimated fair values of financial instruments that are reported in the Company's consolidated balance sheets, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value, are as follows: Fair Value Measurements at Reporting Date Using As of March 31, 2017 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 807,952 $ 807,952 $ 807,952 $ — $ — Investment securities available-for-sale 1,657,591 1,657,591 — 1,657,591 — Investment securities held-to-maturity 490,968 493,925 — 493,925 — Accrued interest receivable 27,712 27,712 — 27,712 — Mortgage servicing rights, net 19,454 36,151 — 36,151 — Loans held for sale 23,237 23,237 — 23,237 — Net loans held for investment 5,300,311 5,148,977 — 5,111,493 37,484 Derivative assets 3,023 3,023 — 3,023 — Deferred compensation plan assets 11,108 11,108 — 11,108 — Total financial assets $ 8,341,356 $ 8,209,676 $ 807,952 $ 7,364,240 $ 37,484 Financial liabilities: Total deposits, excluding time deposits $ 6,299,343 $ 6,299,343 $ 6,299,343 $ — $ — Time deposits 1,000,836 992,746 — 992,746 — Securities sold under repurchase agreements 587,570 587,570 — 587,570 — Other borrowed funds 1 1 — 1 — Accrued interest payable 4,831 4,831 — 4,831 — Long-term debt 27,994 27,520 — 27,520 — Subordinated debentures held by subsidiary trusts 82,477 85,442 — 85,442 — Derivative liabilities 1,688 1,688 — 1,688 — Deferred compensation plan liabilities 11,108 11,108 — 11,108 — Total financial liabilities $ 8,015,848 $ 8,010,249 $ 6,299,343 $ 1,710,906 $ — Fair Value Measurements at Reporting Date Using As of December 31, 2016 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 782,023 $ 782,023 $ 782,023 $ — $ — Investment securities available-for-sale 1,611,698 1,611,698 — 1,611,698 — Investment securities held-to-maturity 512,770 513,273 — 513,273 — Accrued interest receivable 29,852 29,852 — 29,852 — Mortgage servicing rights, net 18,457 35,656 — 35,656 — Loans held for sale 61,794 61,794 — 61,794 Net loans held for investment $ 5,340,536 5,248,127 — 5,208,783 39,344 Derivative assets 2,749 2,749 — 2,749 — Deferred compensation plan assets 10,627 10,627 — 10,627 — Total financial assets $ 8,370,506 $ 8,295,799 $ 782,023 $ 7,474,432 $ 39,344 Financial liabilities: Total deposits, excluding time deposits $ 6,324,512 $ 6,324,512 $ 6,324,512 $ — $ — Time deposits 1,051,598 1,044,670 — 1,044,670 — Securities sold under repurchase agreements 537,556 537,556 — 537,556 — Other borrowed funds 6 6 — 6 — Accrued interest payable 5,421 5,421 — 5,421 — Long-term debt 27,970 27,477 — 27,477 — Subordinated debentures held by subsidiary trusts 82,477 73,554 — 73,554 — Derivative liabilities 1,314 1,314 — 1,314 — Deferred compensation plan liabilities 10,627 10,627 — 10,627 — Total financial liabilities $ 8,041,481 $ 8,025,137 $ 6,324,512 $ 1,700,625 $ —

Recent Authoritative Accounting

Recent Authoritative Accounting Guidance	3 Months Ended
	Mar. 31, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Authoritative Accounting Guidance	Recent Authoritative Accounting Guidance ASU 2014-09 "Revenue from Contracts with Customers." The amendments in Accounting Standards Update ("ASU") 2014-09 introduce a new five-step revenue recognition model in which an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 also requires disclosures sufficient to enable users to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers, including qualitative and quantitative disclosures about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. ASU 2015-14, “Revenue from Contracts with Customers (Topic 606) – Deferral of the Effective Date" was released in August of 2015 deferring the effective date of 2014-09 for all entities by one year until January 1, 2018. The Company is evaluating the new guidance to determine the impact it will have on its consolidated financial statements, results of operations or liquidity. ASU 2016-01 "Financial Instruments-Overall: Recognition and Measurement of Financial Assets and Financial Liabilities." The amendments in ASU 2016-1, among other things, (i) require equity investments, with certain exceptions, to be measured at fair value with changes in fair value recognized in net income, (ii) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment, (iii) eliminates the requirement for public business entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet, (iv) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, (v) requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments, (vi) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements and (viii) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale investment securities. The amendments in ASU 2016-1 will be effective for the Company on January 1, 2018, and are not expected to have a significant impact on the Company’s consolidated financial statements, results of operations or liquidity. ASU 2016-02 "Leases (Topic 842)." On February 25, 2016, the Financial Accounting Standards Board issued new lease accounting guidance in ASU No. 2016-02. Under the new guidance, lessees will be required to recognize a lease liability and a right of use asset for all leases (with the exception of short-term leases) at the commencement date of the lease and disclose key information about leasing arrangements. Accounting by lessors is largely unchanged. ASU 2016-02 will be effective for the Company on January 1, 2019 and will be applied using a modified retrospective approach. The Company is evaluating the new guidance to determine the impact ASU 2016-02 will have on its consolidated financial statements, results of operations or liquidity. ASU 2016-05 "Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships." The amendments in ASU 2016-05 clarify that a change in the counterparty to a derivative instrument that has been designated as the hedging instrument under ASC Topic 815 does not, in and of itself, require redesignation of that hedging relationship provided that all other hedge accounting criteria continue to be met. The amendments in ASU 2016-05 became effective for the Company on January 1, 2017, and did not impact the Company’s consolidated financial statements, results of operations or liquidity. ASU 2016-07 "Investments - Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting." The amendments in ASU 2016-07 eliminate the requirement that when an investment qualified for use of the equity method as a result of an increase in the level of ownership interest or degree of influence, an investor must adjust the investments, results of operations and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods hat the investment had been held. The amendments in ASU 2016-07 also simplify the transition to the equity method of accounting by eliminating retroactive adjustment of the investment when an investment qualifies for use of the equity method, among other things. The amendments in ASU 2016-07 became effective for the Company on January 1, 2017, and did not impact the Company’s consolidated financial statements, results of operations or liquidity. ASU 2016-08 "Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net)." The amendments in ASU 2016-08 were issued to clarify certain principal versus agent considerations within the implementation guidance of ASC Topic 606, “Revenue from Contracts with Customers.” The effective date and transition of ASU 2016-08 is the same as the effective date and transition of ASU 2014-09, Revenue from Contracts with Customers (Topic 606), as discussed above. The Company is continuing to evaluate the new guidance to determine the impact it will have on its consolidated financial statements, results of operations or liquidity. ASU 2016-09 "Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting." Under the amendments in ASU 2016-09, all excess tax benefits and tax deficiencies related to share-based payment awards should be recognized as income tax expense or benefit in the income statement during the period in which they occur. Previously, such amounts were recorded in the pool of excess tax benefits included in additional paid-in capital, if such pool was available. Because excess tax benefits are no longer recognized in additional paid-in capital, the assumed proceeds from applying the treasury stock method when computing earnings per share excludes the amount of excess tax benefits that would have previously been recognized in additional paid-in capital. Additionally, excess tax benefits are classified along with other income tax cash flows as an operating activity rather than a financing activity, as was previously the case. The amendments in ASU 2016-09 also provide that an entity can make an entity-wide accounting policy election to either estimate the number of awards that are expected to vest (current GAAP) or account for forfeitures when they occur. The Company has elected to account for forfeitures when they occur. The amendments in ASU 2016-09 change the threshold to qualify for equity classification to permit withholding up to the maximum statutory tax rates (rather than the minimum as was previously the case) in the applicable jurisdictions. The amendments in ASU 2016-09 became effective for the Company on January 1, 2017, and resulted in a $1,788 reduction in income tax expense during the three months ended March 31, 2017, of which $1,395 was due to the the recognition of excess tax benefits related to outstanding stock option awards exercised during the period and $393 was due to the recognition of excess tax benefits related to the vesting of restricted stock. ASU No. 2016-10 "Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing." The amendments in ASU 2016-10 were issued to clarify ASC Topic 606, “Revenue from Contracts with Customers” related to (i) identifying performance obligations; and (ii) the licensing implementation guidance. The effective date and transition of ASU 2016-10 is the same as the effective date and transition of ASU 2014-09, “Revenue from Contracts with Customers (Topic 606),” as discussed above. The Company is continuing to evaluate the new guidance to determine the impact it will have on its consolidated financial statements, results of operations and liquidity. ASU No. 2016-13 "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments." The amendments in ASU 2016-13 require a financial asset or group of financial assets measured at amortized cost basis to be presented on a company's financial statements at the net amount expected to be collected based on historical experience, current conditions and reasonable and supportable forecasts. ASU 2016-13 requires a company's income statement to reflect the measurement of credit losses for newly recognized financial assets as well as the expected increases or decreases of expected credit losses that have taken place during the period. The amendments in ASU 2016-13 require that the allowance for credit losses for purchased financial assets with a more-than-insignificant amount of credit deterioration since origination be measured at amortized cost basis with the initial allowance for credit losses added to the purchase price rather than being reported as a credit loss expense. ASU 2016-13 also requires that credit losses relating to available-for-sale debt securities be recorded through an allowance for credit losses. The amendments in ASU 2016-13 are effective for the Company for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The amendments will be applied through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period. A prospective transition approach is required for debt securities for which other-than-temporary impairment was recognized before the effective date. Amounts previously recognized in accumulated other comprehensive income as of the date of adoption that relate to improvement in cash flows expected to be collected will continue to be accreted into income over the remaining life of the asset. Recoveries of amounts previously written off relating to improvements in cash flows after the date of adoption will be recorded in earnings when received. The Company is currently evaluating the new guidance to determine the impact it will have on its consolidated financial statements, results of operations and liquidity. ASU No. 2016-15 "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments." The amendments in ASU 2016-15 are intended to reduce diversity in practice in how eight particular transactions are classified in the statement of cash flows. The amendments in ASU 2016-15 are effective for the Company on January 1, 2018. Early adoption is permitted, provided that all of the amendments are adopted in the same period. Entities will be required to apply the guidance retrospectively. If it is impracticable to apply the guidance retrospectively for an issue, the amendments related to that issue would be applied prospectively. The amendments in ASU 2016-15 only affect the classification of certain items within the statement of cash flows, and are not expected to have a significant impact on impact on the Company’s consolidated financial statements, results of operations or liquidity. ASU No. 2017-04, “Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” The amendments in ASU 2017-04 remove Step 2 of the goodwill impairment test, which requires a hypothetical purchase price allocation. Goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. All other goodwill impairment guidance will remain largely unchanged. ASU No. 2017-04 is effective for interim and annual reporting periods beginning after December 15, 2019, applied prospectively. Early adoption is permitted for any impairment tests performed after January 1, 2017. The amendments in ASU 2017-04 are not expected to have a significant impact on the Company’s consolidated financial statements, results of operations or liquidity. ASU No. 2017-07, “Compensation - Retirement Benefits (Topic 750): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.” The amendments in ASU 2017-07 requires employers to present the service cost component of the net periodic benefit cost in the same income statement line item as other employee compensation costs arising from services rendered during the period. The other components of net benefit cost are required to be presented in the income separately from the service cost component and outside a subtotal of income from operations, if one is presented. The amendments in ASU 2017-07 also allow only the service cost component to be eligible for capitalization. ASU No. 2017-07 is effective for the Company for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted. The amendments in ASU 2017-07 are applied retrospectively for the presentation of the service cost and other components of net periodic benefit cost in the income statement and prospectively for the capitalization of the service cost in other assets. ASU 2017-07 allow the use of a practical expedient the permits an employer to use the amounts disclosed in its pension and other post-retirement benefits plan footnote for the prior comparative periods as the estimation basis for applying the retrospective presentation requirements. Adoption of the amendments in ASU 2017-07 will not have a have a significant impact on the Company’s consolidated financial statements, results of operations or liquidity. ASU No. 2017-08, “Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities.” The amendments in ASU 2017-08 shorten the amortization period for the premium on certain purchased callable debt securities to the earliest call date. The new guidance does not change the accounting for purchased callable debt securities held at a discount; the discount continues to be amortized to maturity. ASU No. 2017-08 is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted. The guidance calls for a modified retrospective transition approach under which a cumulative-effect adjustment will be made to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. The Company currently amortizes premiums on callable debt securities to the earliest call date. As such, the amendments in ASU 2017-08 will not impact the Company's consolidated financial statements, results of operations and liquidity.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Subsequent events have been evaluated for potential recognition and disclosure through the date financial statements were filed with the SEC. On April 17, 2017 , the Company declared a quarterly dividend to common shareholders of $ 0.24 per share, to be paid on May 12, 2017 to shareholders of record as of May 2, 2017 . No other events requiring recognition or disclosure were identified.

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Amortized Cost and Approximate Fair Values of Investment Securities	The amortized cost and approximate fair values of investment securities are summarized as follows: March 31, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Available-for-Sale: U.S. Treasury notes $ 3,608 $ 5 $ (1 ) $ 3,612 Obligations of U.S. government agencies 411,096 449 (4,302 ) 407,243 U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 1,243,751 8,257 (8,345 ) 1,243,663 Private mortgage-backed securities 106 1 (1 ) 106 Other investments 2,951 16 — 2,967 Total $ 1,661,512 $ 8,728 $ (12,649 ) $ 1,657,591 March 31, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Held-to-Maturity: State, county and municipal securities $ 153,679 $ 3,121 $ (222 ) $ 156,578 Corporate securities 52,918 248 (67 ) 53,099 Obligations of U.S. government agencies 19,737 — (82 ) 19,655 U.S agency residential mortgage-backed securities & collateralized mortgage obligations 264,427 9,044 (9,086 ) 264,385 Other investments 207 1 — 208 Total $ 490,968 $ 12,414 $ (9,457 ) $ 493,925 December 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Available-for-Sale: U.S. Treasury notes $ 3,608 $ 5 $ (1 ) $ 3,612 Obligations of U.S. government agencies 397,411 343 (6,457 ) 391,297 U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 1,220,890 6,412 (13,601 ) 1,213,701 Private mortgage-backed securities 116 1 (1 ) 116 Other investments 2,951 21 — 2,972 Total $ 1,624,976 $ 6,782 $ (20,060 ) $ 1,611,698 December 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Held-to-Maturity: State, county and municipal securities $ 160,192 $ 2,723 $ (542 ) $ 162,373 Corporate securities 53,032 139 (211 ) 52,960 Obligations of U.S. government agencies 19,737 — (162 ) 19,575 U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 279,578 7,804 (9,249 ) 278,133 Other investments 231 1 — 232 Total $ 512,770 $ 10,667 $ (10,164 ) $ 513,273
Realized Gains (Losses) on Investments	Gross realized gains and losses from the disposition of investment securities are summarized in the following table: Three Months Ended March 31, 2017 2016 Gross realized gains $ 2 $ 57 Gross realized losses — (78 )
Gross Unrealized Losses and Fair Values of Investment Securities	The following tables show the gross unrealized losses and fair values of investment securities, aggregated by investment category, and the length of time individual investment securities have been in a continuous unrealized loss position, as of March 31, 2017 and December 31, 2016 : Less than 12 Months 12 Months or More Total March 31, 2017 Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Available-for-Sale: U.S. Treasury notes $ 598 $ (1 ) $ — $ — $ 598 $ (1 ) Obligations of U.S. government agencies 324,693 (4,287 ) 9,984 (15 ) 334,677 (4,302 ) U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 652,089 (7,765 ) 23,282 (580 ) 675,371 (8,345 ) Private mortgage-backed securities — — 43 (1 ) 43 (1 ) Total $ 977,380 $ (12,053 ) $ 33,309 $ (596 ) $ 1,010,689 $ (12,649 ) Less than 12 Months 12 Months or More Total March 31, 2017 Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Held-to-Maturity: State, county and municipal securities $ 23,353 $ (218 ) $ 2,442 $ (4 ) $ 25,795 $ (222 ) U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 77,626 (7,816 ) 18,509 (1,270 ) 96,135 (9,086 ) Obligations of U.S. government agencies 19,655 (82 ) — — 19,655 (82 ) Corporate securities 16,061 (67 ) — — 16,061 (67 ) Total $ 136,695 $ (8,183 ) $ 20,951 $ (1,274 ) $ 157,646 $ (9,457 ) Less than 12 Months 12 Months or More Total December 31, 2016 Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Available-for-Sale: U.S. Treasury notes $ 598 $ (1 ) $ — $ — $ 598 $ (1 ) Obligations of U.S. government agencies 316,511 (6,457 ) — — 316,511 (6,457 ) U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 746,265 (13,102 ) 15,801 (499 ) 762,066 (13,601 ) Private mortgage-backed securities — — 48 (1 ) 48 (1 ) Total $ 1,063,374 $ (19,560 ) $ 15,849 $ (500 ) $ 1,079,223 $ (20,060 ) Less than 12 Months 12 Months or More Total December 31, 2016 Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Held-to-Maturity: State, county and municipal securities $ 42,518 $ (533 ) $ 2,831 $ (9 ) $ 45,349 $ (542 ) Obligations of U.S. government agencies 19,575 (162 ) — — 19,575 (162 ) U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 108,857 (7,973 ) 19,986 (1,276 ) 128,843 (9,249 ) Corporate securities 32,474 (211 ) — — 32,474 (211 ) Total $ 203,424 $ (8,879 ) $ 22,817 $ (1,285 ) $ 226,241 $ (10,164 )
Maturities of Investment Securities	Maturities of investment securities at March 31, 2017 are shown below. Maturities of mortgage-backed securities have been adjusted to reflect shorter maturities based upon estimated prepayments of principal. All other investment securities maturities are shown at contractual maturity dates. Available-for-Sale Held-to-Maturity March 31, 2017 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Within one year $ 326,690 $ 326,645 $ 75,598 $ 76,786 After one year but within five years 1,108,186 1,105,388 278,753 278,372 After five years but within ten years 164,443 163,370 109,051 110,987 After ten years 62,193 62,188 27,566 27,780 Total $ 1,661,512 $ 1,657,591 $ 490,968 $ 493,925

Loans (Tables)

Loans (Tables)	3 Months Ended
	Mar. 31, 2017
Receivables [Abstract]
Schedule of Recorded Investment in Past Due Loans by Class	Total Loans 30 - 59 60 - 89 > 90 30 or More Days Days Days Days Current Non-accrual Total As of March 31, 2017 Past Due Past Due Past Due Past Due Loans Loans Loans Real estate Commercial $ 4,936 $ 776 $ 322 $ 6,034 $ 1,784,284 $ 29,336 $ 1,819,654 Construction: Land acquisition & development 398 165 — 563 194,943 4,906 200,412 Residential 1,418 — 706 2,124 141,288 440 143,852 Commercial 231 — — 231 116,542 4,381 121,154 Total construction loans 2,047 165 706 2,918 452,773 9,727 465,418 Residential 7,487 463 1,091 9,041 988,838 6,166 1,004,045 Agricultural 1,014 — 322 1,336 164,724 1,689 167,749 Total real estate loans 15,484 1,404 2,441 19,329 3,390,619 46,918 3,456,866 Consumer: Indirect consumer 5,742 1,525 516 7,783 753,337 1,357 762,477 Other consumer 794 425 59 1,278 143,881 284 145,443 Credit card 628 264 630 1,522 63,719 — 65,241 Total consumer loans 7,164 2,214 1,205 10,583 960,937 1,641 973,161 Commercial 3,176 1,733 711 5,620 787,125 25,096 817,841 Agricultural 2,738 83 170 2,991 121,576 925 125,492 Other, including overdrafts — — — — 3,182 — 3,182 Loans held for investment 28,562 5,434 4,527 38,523 5,263,439 74,580 5,376,542 Mortgage loans originated for sale — — — — 23,237 — 23,237 Total loans $ 28,562 $ 5,434 $ 4,527 $ 38,523 $ 5,286,676 $ 74,580 $ 5,399,779 Total Loans 30 - 59 60 - 89 > 90 30 or More Days Days Days Days Current Non-accrual Total As of December 31, 2016 Past Due Past Due Past Due Past Due Loans Loans Loans Real estate Commercial $ 7,307 $ 1,099 $ 303 $ 8,709 $ 1,799,525 $ 26,211 $ 1,834,445 Construction: Land acquisition & development 633 352 279 1,264 202,223 5,025 208,512 Residential 931 264 — 1,195 146,245 456 147,896 Commercial — — — — 124,827 762 125,589 Total construction loans 1,564 616 279 2,459 473,295 6,243 481,997 Residential 3,986 1,280 702 5,968 1,014,990 6,435 1,027,393 Agricultural 341 287 — 628 165,293 4,327 170,248 Total real estate loans 13,198 3,282 1,284 17,764 3,453,103 43,216 3,514,083 Consumer: Indirect consumer 8,425 2,329 712 11,466 740,163 780 752,409 Other consumer 1,322 235 167 1,724 146,006 357 148,087 Credit card 504 333 567 1,404 68,366 — 69,770 Total consumer loans 10,251 2,897 1,446 14,594 954,535 1,137 970,266 Commercial 3,171 727 734 4,632 767,878 25,432 797,942 Agricultural 1,518 362 14 1,894 127,956 3,008 132,858 Other, including overdrafts — 1 311 312 1,289 — 1,601 Loans held for investment 28,138 7,269 3,789 39,196 5,304,761 72,793 5,416,750 Mortgage loans originated for sale — — — — 61,794 — 61,794 Total loans $ 28,138 $ 7,269 $ 3,789 $ 39,196 $ 5,366,555 $ 72,793 $ 5,478,544
Schedule of acquired loans with credit impairment	The following table displays the outstanding unpaid principal balance and accrual status of loans acquired with credit impairment as of March 31, 2017 and 2016 : As of March 31, 2017 2016 Outstanding balance $ 32,623 $ 33,175 Carrying value Loans on accrual status 18,920 21,064 Total carrying value $ 18,920 $ 21,064 The following table summarizes changes in the accretable yield for loans acquired credit impaired for the three months ended March 31, 2017 and 2016 : Three Months Ended March 31, 2017 2016 Beginning balance $ 6,803 $ 6,713 Additions — — Accretion income (605 ) (614 ) Reductions due to exit events (570 ) (147 ) Reclassifications from nonaccretable differences 804 726 Ending balance $ 6,432 $ 6,678
Schedule of Recorded Investment in Impaired Loans	The following tables present information on the Company’s recorded investment in impaired loans as of dates indicated: As of March 31, 2017 Unpaid Total Principal Balance Recorded Investment With No Allowance Recorded Investment With Allowance Total Recorded Investment Related Allowance Real estate: Commercial $ 55,648 $ 24,392 $ 20,218 $ 44,610 $ 4,105 Construction: Land acquisition & development 11,391 3,886 1,578 5,464 939 Residential 933 214 — 214 35 Commercial 4,734 228 4,267 4,495 2,870 Total construction loans 17,058 4,328 5,845 10,173 3,844 Residential 8,184 4,371 2,283 6,654 111 Agricultural 2,436 1,890 185 2,075 6 Total real estate loans 83,326 34,981 28,531 63,512 8,066 Commercial 40,135 14,760 18,319 33,079 7,176 Agricultural 1,188 691 464 1,155 223 Total $ 124,649 $ 50,432 $ 47,314 $ 97,746 $ 15,465 As of December 31, 2016 Unpaid Total Principal Balance Recorded Investment With No Allowance Recorded Investment With Allowance Total Recorded Investment Related Allowance Real estate: Commercial $ 57,017 $ 24,410 $ 21,420 $ 45,830 $ 2,847 Construction: Land acquisition & development 12,084 4,330 1,813 6,143 826 Residential 1,555 219 619 838 1 Commercial 4,786 3,940 647 4,587 657 Total construction loans 18,425 8,489 3,079 11,568 1,484 Residential 8,222 4,074 2,470 6,544 253 Agricultural 5,069 4,509 181 4,690 4 Total real estate loans 88,733 41,482 27,150 68,632 4,588 Commercial 40,314 13,230 19,167 32,397 9,254 Agricultural 3,738 3,280 382 3,662 112 Total $ 132,785 $ 57,992 $ 46,699 $ 104,691 $ 13,954 The following table presents the average recorded investment in and income recognized on impaired loans for the periods indicated: Three Months Ended March 31, 2017 2016 Average Recorded Investment Income Recognized Average Recorded Investment Income Recognized Real estate: Commercial $ 45,220 $ 125 $ 33,483 $ 36 Construction: Land acquisition & development 5,804 4 7,508 7 Residential 526 — 288 — Commercial 4,541 43 1,067 — Total construction loans 10,871 47 8,863 7 Residential 6,599 4 4,206 1 Agricultural 3,383 — 5,748 1 Total real estate loans 66,073 176 52,300 45 Commercial 32,738 49 23,379 15 Agricultural 2,409 2 856 — Total $ 101,220 $ 227 $ 76,535 $ 60
Schedule of Loans Renegotiated in Troubled Debt Restructurings	Number of Notes Type of Concession Principal Balance at Restructure Date Three Months Ended March 31, 2017 Interest only period Extension of term or amortization schedule Interest rate adjustment Other (1) Commercial real estate 4 $ 1,475 $ 162 $ — $ 909 $ 2,546 Commercial 13 495 1,968 — 4,981 7,444 Total loans restructured during period 17 $ 1,970 $ 2,130 $ — $ 5,890 $ 9,990 (1) Other includes concessions that reduce or defer payments for a specified period of time and/or concessions that do not fit into other designated categories. The Company considers a payment default to occur on troubled debt restructurings when the loan is 90 days or more past due or was placed on non-accrual status after the modification.
Schedule of Recorded Investment in Criticized Loans by Class and Credit Quality Indicator	The following tables present the Company’s recorded investment in criticized loans by class and credit quality indicator based on the most recent analysis performed as of the dates indicated: As of March 31, 2017 Other Assets Especially Mentioned Substandard Doubtful Total Criticized Loans Real estate: Commercial $ 73,394 $ 90,127 $ 12,118 $ 175,639 Construction: Land acquisition & development 16,793 6,754 1,400 24,947 Residential 2,043 2,724 620 5,387 Commercial 1,494 3,385 4,284 9,163 Total construction loans 20,330 12,863 6,304 39,497 Residential 4,616 11,766 922 17,304 Agricultural 4,595 14,517 — 19,112 Total real estate loans 102,935 129,273 19,344 251,552 Consumer: Indirect consumer 471 2,096 76 2,643 Other consumer 586 962 213 1,761 Credit card — 127 — 127 Total consumer loans 1,057 3,185 289 4,531 Commercial 33,368 54,963 18,029 106,360 Agricultural 7,446 12,926 747 21,119 Total $ 144,806 $ 200,347 $ 38,409 $ 383,562 As of December 31, 2016 Other Assets Especially Mentioned Substandard Doubtful Total Criticized Loans Real estate: Commercial $ 85,292 $ 85,293 $ 10,842 $ 181,427 Construction: Land acquisition & development 13,414 6,214 1,401 21,029 Residential 412 1,621 656 2,689 Commercial 1,555 6,344 664 8,563 Total construction loans 15,381 14,179 2,721 32,281 Residential 5,038 12,472 764 18,274 Agricultural 3,831 17,813 — 21,644 Total real estate loans 109,542 129,757 14,327 253,626 Consumer: Indirect consumer 778 1,527 101 2,406 Other consumer 681 1,036 264 1,981 Total consumer loans 1,459 2,563 365 4,387 Commercial 46,402 29,281 21,240 96,923 Agricultural 6,178 10,724 404 17,306 Total $ 163,581 $ 172,325 $ 36,336 $ 372,242

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2017
Receivables [Abstract]
Schedule of Allowance for Loan Losses by Portfolio Segment	The following tables present a summary of changes in the allowance for loan losses by portfolio segment for the periods indicated: Three Months Ended March 31, 2017 Real Estate Consumer Commercial Agriculture Other Total Allowance for loan losses: Beginning balance $ 28,625 $ 7,711 $ 38,092 $ 1,786 $ — $ 76,214 Provision charged to operating expense 4,387 2,048 (4,128 ) (577 ) — 1,730 Less loans charged-off (444 ) (2,596 ) (793 ) (22 ) — (3,855 ) Add back recoveries of loans previously charged-off 524 1,205 391 22 — 2,142 Ending balance $ 33,092 $ 8,368 $ 33,562 $ 1,209 $ — $ 76,231 As of March 31, 2017 Real Estate Consumer Commercial Agriculture Other Total Allowance for loan losses: Loans individually evaluated for impairment $ 8,066 $ — $ 7,176 $ 223 $ — $ 15,465 Loans collectively evaluated for impairment 25,026 8,368 26,386 986 — 60,766 Allowance for loan losses $ 33,092 $ 8,368 $ 33,562 $ 1,209 $ — $ 76,231 Loans held for investment: Individually evaluated for impairment $ 63,512 $ — $ 33,079 $ 1,155 $ — $ 97,746 Collectively evaluated for impairment 3,393,354 973,161 784,762 124,337 3,182 5,278,796 Total loans $ 3,456,866 $ 973,161 $ 817,841 $ 125,492 $ 3,182 $ 5,376,542 Three Months Ended March 31, 2016 Real Estate Consumer Commercial Agriculture Other Total Allowance for loan losses: Beginning balance $ 52,296 $ 5,144 $ 18,775 $ 602 $ — $ 76,817 Provision charged to operating expense (16,081 ) 1,229 17,690 1,162 — 4,000 Less loans charged-off (1,922 ) (1,892 ) (488 ) — — (4,302 ) Add back recoveries of loans previously charged-off 2,359 775 275 — — 3,409 Ending balance $ 36,652 $ 5,256 $ 36,252 $ 1,764 $ — $ 79,924 As of December 31, 2016 Real Estate Consumer Commercial Agriculture Other Total Allowance for loan losses: Loans individually evaluated for impairment $ 4,588 $ — $ 9,254 $ 112 $ — $ 13,954 Loans collectively evaluated for impairment 24,037 7,711 28,838 1,674 — 62,260 Allowance for loan losses $ 28,625 $ 7,711 $ 38,092 $ 1,786 $ — $ 76,214 Loans held for investment: Individually evaluated for impairment $ 68,632 $ — $ 32,397 $ 3,662 $ — $ 104,691 Collectively evaluated for impairment 3,445,451 970,266 765,545 129,196 1,601 5,312,059 Total loans $ 3,514,083 $ 970,266 $ 797,942 $ 132,858 $ 1,601 $ 5,416,750

OREO (Tables)

OREO (Tables)	3 Months Ended
	Mar. 31, 2017
Repossessed Assets [Abstract]
Other Real Estate Owned Roll Forward	Information with respect to the Company's other real estate owned follows: Three Months Ended March 31, 2017 2016 Beginning balance $ 10,019 $ 6,254 Additions 368 3,227 Valuation adjustments (47 ) (17 ) Dispositions (912 ) (207 ) Ending balance $ 9,428 $ 9,257 The carrying values of foreclosed residential real estate properties included in other real estate owned were $ 2,538 and $2,282 as of March 31, 2017 and December 31, 2016, respectively. The Company did not have any consumer mortgage loans collateralized by residential real estate property that were in the process of foreclosure as of March 31, 2017 or December 31, 2016.

Derivatives and Hedging (Tables

Derivatives and Hedging (Tables)	3 Months Ended
	Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]	March 31, 2017 December 31, 2016 Notional Amount Estimated Fair Value Notional Amount Estimated Fair Value Derivative Assets (included in other assets): Derivatives designated as hedges: Interest rate swap contracts $ 100,000 $ 16 $ — $ — Non-hedging interest rate derivatives: Interest rate swap contracts 53,188 1,295 53,593 1,332 Interest rate lock commitments 61,915 1,712 73,422 1,131 Forward loan sales contracts — — 126,836 286 Total derivative assets $ 215,103 $ 3,023 $ 253,851 $ 2,749 Derivative Liabilities (included in accounts payable and accrued expenses): Derivatives designated as hedges: Interest rate swap contracts $ — $ — $ 100,000 $ 33 Non-hedging interest rate derivatives: Interest rate swap contracts 53,188 1,283 53,593 1,281 Forward loan sales contracts 84,004 405 — — Total derivative liabilities $ 137,192 $ 1,688 $ 153,593 $ 1,314
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]	Three Months Ended March 31, 2017 2016 Derivatives designated as hedges: Amount of gain (loss) recognized in other comprehensive income (effective portion) $ 49 $ (2,197 ) Non-hedging interest rate derivatives: Amount of loss recognized in other non-interest income (39 ) (29 ) Amount of net fee expense recognized in other non-interest income (42 ) — Amount of net gains (losses) recognized in mortgage banking revenues (109 ) 695

Earnings per Share (Tables)

Earnings per Share (Tables)	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings per Share	The following table sets forth the computation of basic and diluted earnings per share for the three month periods ended March 31, 2017 and 2016 : Three Months Ended March 31, 2017 2016 Net income $ 23,126 $ 20,124 Weighted average common shares outstanding for basic earnings per share computation 44,680,258 44,719,218 Dilutive effects of stock-based compensation 558,650 394,834 Weighted average common shares outstanding for diluted earnings per common share computation 45,238,908 45,114,052 Basic earnings per common share $ 0.52 $ 0.45 Diluted earnings per common share $ 0.51 $ 0.45 Anti-dilutive unvested time restricted stock 96,897 40,865

Regulatory Capital (Tables)

Regulatory Capital (Tables)	3 Months Ended
	Mar. 31, 2017
Banking and Thrift [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	Actual capital amounts and ratios for the Company and its bank subsidiary, as of March 31, 2017 and December 31, 2016 are presented in the following tables: Actual Adequately Capitalized Basel III Phase-In Schedule Adequately Capitalized Basel III Fully Phased-In Well Capitalized (1) Amount Ratio Amount Ratio Amount Ratio Amount Ratio March 31, 2017 Total risk-based capital: Consolidated $ 957,008 14.94 % $ 592,579 9.25 % $ 672,658 10.5 % $ 640,626 10.0 % FIB 861,953 13.52 589,927 9.25 669,646 10.5 637,759 10.0 Tier 1 risk-based capital: Consolidated 880,777 13.75 464,454 7.25 544,532 8.5 512,501 8.0 FIB 785,722 12.32 462,375 7.25 542,095 8.5 510,207 8.0 Common equity tier 1 risk-based capital: Consolidated 800,777 12.50 368,360 5.75 448,438 7.0 416,407 6.5 FIB 785,722 12.32 366,711 5.75 446,431 7.0 414,543 6.5 Leverage capital ratio: Consolidated 880,777 10.09 349,244 4.00 349,244 4.0 436,555 5.0 FIB 785,722 9.02 348,525 4.00 348,525 4.0 435,656 5.0 Actual Adequately Capitalized Basel III Phase-In Schedule Adequately Capitalized Basel III Fully Phased-In Well Capitalized (1) Amount Ratio Amount Ratio Amount Ratio Amount Ratio December 31, 2016 Total risk-based capital: Consolidated $ 974,488 15.13 % $ 555,665 8.63 % $ 676,070 10.5 % $ 643,876 10.0 % FIB 841,967 13.13 553,459 8.63 673,386 10.5 641,320 10.0 Tier 1 risk-based capital: Consolidated 894,273 13.89 426,890 6.63 547,295 8.5 $ 515,101 8.0 FIB 765,753 11.94 425,195 6.63 545,122 8.5 513,056 8.0 Common equity tier 1 risk-based capital: Consolidated 814,273 12.65 330,308 5.13 450,713 7.0 $ 418,519 6.5 FIB 765,753 11.94 328,997 5.13 448,924 7.0 416,858 6.5 Leverage capital ratio: Consolidated 894,273 10.11 353,838 4.00 353,838 4.0 $ 442,297 5.0 FIB 765,753 8.69 352,283 4.00 352,283 4.0 440,353 5.0 (1) The ratios for the well capitalized requirement are only applicable to FIB. However, the Company manages its capital position as if the requirement applies to the consolidated entity and has presented the ratios as if they also applied on a consolidated basis.

Other Comprehensive Income (Tab

Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2017
Equity [Abstract]
Schedule of Comprehensive Income (Loss)	Other Comprehensive Income/Loss The gross amounts of each component of other comprehensive income and the related tax effects are as follows: Pre-tax Tax (Expense) Benefit Net of Tax Three Months Ended March 31, 2017 2016 2017 2016 2017 2016 Investment securities available-for sale: Change in net unrealized gains during period $ 9,354 $ 8,613 $ 3,681 $ 3,360 $ 5,673 $ 5,253 Reclassification adjustment for net (gains) losses included in net income (2 ) 21 (1 ) 8 (1 ) 13 Change in unamortized loss on available- for-sale securities transferred into held-to- maturity 463 465 182 183 281 282 Unrealized (gain) loss on derivatives 49 (2,197 ) 19 (835 ) 30 (1,362 ) Defined benefits post-retirement benefit plan: Change in net actuarial (gain) loss (739 ) 15 (291 ) 6 (448 ) 9 Total other comprehensive income $ 9,125 $ 6,917 $ 3,590 $ 2,722 $ 5,535 $ 4,195
Schedule of Accumulated Other Comprehensive Income (Loss)	The components of accumulated other comprehensive loss, net of related tax effects, are as follows: March 31, December 31, Net unrealized loss on investment securities available-for-sale $ (4,190 ) $ (10,143 ) Net unrealized gain on derivatives 1,590 2,038 Net actuarial gain (loss) on defined benefit post-retirement benefit plans 7 (23 ) Net accumulated other comprehensive loss $ (2,593 ) $ (8,128 )

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis	Financial assets and financial liabilities measured at fair value on a recurring basis are as follows: Fair Value Measurements at Reporting Date Using As of March 31, 2017 Balance Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Investment securities available-for-sale: U.S. Treasury Notes $ 3,612 $ — $ 3,612 $ — Obligations of U.S. government agencies 407,243 — 407,243 — U.S. agencies mortgage-backed securities & collateralized mortgage obligations 1,243,663 — 1,243,663 — Private mortgage-backed securities 106 — 106 — Other investments 2,967 — 2,967 — Loans held for sale 23,237 — 23,237 — Derivative assets: Interest rate swap contracts 1,311 — 1,311 — Interest rate lock commitments 1,712 — 1,712 — Derivative liabilities: Interest rate swap contracts 1,283 — 1,283 — Forward loan sale contracts 405 — 405 — Deferred compensation plan assets 11,108 — 11,108 — Deferred compensation plan liabilities 11,108 — 11,108 — Fair Value Measurements at Reporting Date Using As of December 31, 2016 Balance Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Investment securities available-for-sale: U.S. Treasury notes $ 3,612 $ — $ 3,612 $ — Obligations of U.S. government agencies 391,297 — 391,297 — U.S. agencies mortgage-backed securities & collateralized mortgage obligations 1,213,701 — 1,213,701 — Private mortgage-backed securities 116 — 116 — Other investments 2,972 — 2,972 — Loans held for sale 61,794 — 61,794 — Derivative assets: Interest rate swap contracts 1,332 — 1,332 — Interest rate lock commitments 1,131 — 1,131 — Forward loan sales contracts 286 — 286 — Derivative liabilities Interest rate swap contracts 1,314 — 1,314 — Deferred compensation plan assets 10,627 — 10,627 — Deferred compensation plan liabilities 10,627 — 10,627 —
Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Non-Recurring Basis	The following table presents information about the Company’s assets and liabilities measured at fair value on a non-recurring basis: Fair Value Measurements at Reporting Date Using As of March 31, 2017 Balance Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Impaired loans $ 37,484 $ — $ — $ 37,484 Other real estate owned 1,682 — — 1,682 Long-lived assets to be disposed of by sale 356 — — 356 Fair Value Measurements at Reporting Date Using As of December 31, 2016 Balance Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Impaired loans $ 39,344 $ — $ — $ 39,344 Other real estate owned 2,110 — — 2,110 Long-lived assets to be disposed of by sale 1,335 — — 1,335
Fair Value Inputs, Assets, Quantitative Information	Fair Value As of March 31, 2017 December 31, 2016 Valuation Technique Unobservable Inputs Range (Weighted Average) Impaired loans $ 37,484 $ 39,344 Appraisal Appraisal adjustment 0% - 66% (31%) Other real estate owned 1,682 2,110 Appraisal Appraisal adjustment 8% - 96% (18%) Long-lived assets to be disposed of by sale 356 1,335 Appraisal Appraisal adjustment 0% - 9% (6%)
Fair Value, by Balance Sheet Grouping	Fair Value Measurements at Reporting Date Using As of March 31, 2017 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 807,952 $ 807,952 $ 807,952 $ — $ — Investment securities available-for-sale 1,657,591 1,657,591 — 1,657,591 — Investment securities held-to-maturity 490,968 493,925 — 493,925 — Accrued interest receivable 27,712 27,712 — 27,712 — Mortgage servicing rights, net 19,454 36,151 — 36,151 — Loans held for sale 23,237 23,237 — 23,237 — Net loans held for investment 5,300,311 5,148,977 — 5,111,493 37,484 Derivative assets 3,023 3,023 — 3,023 — Deferred compensation plan assets 11,108 11,108 — 11,108 — Total financial assets $ 8,341,356 $ 8,209,676 $ 807,952 $ 7,364,240 $ 37,484 Financial liabilities: Total deposits, excluding time deposits $ 6,299,343 $ 6,299,343 $ 6,299,343 $ — $ — Time deposits 1,000,836 992,746 — 992,746 — Securities sold under repurchase agreements 587,570 587,570 — 587,570 — Other borrowed funds 1 1 — 1 — Accrued interest payable 4,831 4,831 — 4,831 — Long-term debt 27,994 27,520 — 27,520 — Subordinated debentures held by subsidiary trusts 82,477 85,442 — 85,442 — Derivative liabilities 1,688 1,688 — 1,688 — Deferred compensation plan liabilities 11,108 11,108 — 11,108 — Total financial liabilities $ 8,015,848 $ 8,010,249 $ 6,299,343 $ 1,710,906 $ — Fair Value Measurements at Reporting Date Using As of December 31, 2016 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 782,023 $ 782,023 $ 782,023 $ — $ — Investment securities available-for-sale 1,611,698 1,611,698 — 1,611,698 — Investment securities held-to-maturity 512,770 513,273 — 513,273 — Accrued interest receivable 29,852 29,852 — 29,852 — Mortgage servicing rights, net 18,457 35,656 — 35,656 — Loans held for sale 61,794 61,794 — 61,794 Net loans held for investment $ 5,340,536 5,248,127 — 5,208,783 39,344 Derivative assets 2,749 2,749 — 2,749 — Deferred compensation plan assets 10,627 10,627 — 10,627 — Total financial assets $ 8,370,506 $ 8,295,799 $ 782,023 $ 7,474,432 $ 39,344 Financial liabilities: Total deposits, excluding time deposits $ 6,324,512 $ 6,324,512 $ 6,324,512 $ — $ — Time deposits 1,051,598 1,044,670 — 1,044,670 — Securities sold under repurchase agreements 537,556 537,556 — 537,556 — Other borrowed funds 6 6 — 6 — Accrued interest payable 5,421 5,421 — 5,421 — Long-term debt 27,970 27,477 — 27,477 — Subordinated debentures held by subsidiary trusts 82,477 73,554 — 73,554 — Derivative liabilities 1,314 1,314 — 1,314 — Deferred compensation plan liabilities 10,627 10,627 — 10,627 — Total financial liabilities $ 8,041,481 $ 8,025,137 $ 6,324,512 $ 1,700,625 $ —

Business Combination (Details)

Business Combination (Details)	May 30, 2017	Mar. 31, 2017USD ($)$ / shares	Dec. 31, 2016USD ($)
Business Acquisition [Line Items]
Assets		$ 9,061,234,000	$ 9,063,895,000
Deposits		7,300,179,000	$ 7,376,110,000
Estimate of total assets		$ 12,000,000,000
Bank of the Cascades [Member]
Business Acquisition [Line Items]
Number of banking offices		46
Assets		$ 3,136,672,000
Deposits		2,714,781,000
Loans Receivable, Net		2,088,174,000
Bank of the Cascades [Member]
Business Acquisition [Line Items]
Business Acquisition Conversion Rate		1.91
Estimate of Consideration Transferred		$ 595,128,000
Bank of the Cascades [Member] | Class A Common Stock
Business Acquisition [Line Items]
Business Acquisition Conversion Share Rate | $ / shares		$ 0.14864
Subsequent Event [Member] | Bank of the Cascades [Member] | Class A Common Stock
Business Acquisition [Line Items]
Business Acquisition, Expected Effective Date of Acquisition	May 30, 2017

Amortized Cost and Approximate

Amortized Cost and Approximate Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Available-for-Sale:
Available-for-Sale, Amortized Cost	$ 1,661,512	$ 1,624,976
Available-for-sale Securities, Gross Unrealized Gain1	8,728	6,782
Available-for-sale Securities, Gross Unrealized Loss1	(12,649)	(20,060)
Available-for-Sale, Estimated Fair Value	1,657,591	1,611,698
Held-to-Maturity:
Held-to-Maturity, Amortized Cost	490,968	512,770
Held-to-maturity Securities, Gross Unrealized Gain1	12,414	10,667
Held-to-maturity Securities, Gross Unrealized Loss1	(9,457)	(10,164)
Held-to-Maturity, Estimated Fair Value	493,925	513,273
US Treasury Securities [Member]
Available-for-Sale:
Available-for-Sale, Amortized Cost	3,608	3,608
Available-for-sale Securities, Gross Unrealized Gain1	5	5
Available-for-sale Securities, Gross Unrealized Loss1	(1)	(1)
Available-for-Sale, Estimated Fair Value	3,612	3,612
Obligations of U.S. government agencies
Available-for-Sale:
Available-for-Sale, Amortized Cost	411,096	397,411
Available-for-sale Securities, Gross Unrealized Gain1	449	343
Available-for-sale Securities, Gross Unrealized Loss1	(4,302)	(6,457)
Available-for-Sale, Estimated Fair Value	407,243	391,297
Held-to-Maturity:
Held-to-Maturity, Amortized Cost	19,737	19,737
Held-to-maturity Securities, Gross Unrealized Gain1	0	0
Held-to-maturity Securities, Gross Unrealized Loss1	(82)	(162)
Held-to-Maturity, Estimated Fair Value	19,655	19,575
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
Available-for-Sale:
Available-for-Sale, Amortized Cost	1,243,751	1,220,890
Available-for-sale Securities, Gross Unrealized Gain1	8,257	6,412
Available-for-sale Securities, Gross Unrealized Loss1	(8,345)	(13,601)
Available-for-Sale, Estimated Fair Value	1,243,663	1,213,701
Held-to-Maturity:
Held-to-Maturity, Amortized Cost	264,427	279,578
Held-to-maturity Securities, Gross Unrealized Gain1	9,044	7,804
Held-to-maturity Securities, Gross Unrealized Loss1	(9,086)	(9,249)
Held-to-Maturity, Estimated Fair Value	264,385	278,133
Private mortgage-backed securities
Available-for-Sale:
Available-for-Sale, Amortized Cost	106	116
Available-for-sale Securities, Gross Unrealized Gain1	1	1
Available-for-sale Securities, Gross Unrealized Loss1	(1)	(1)
Available-for-Sale, Estimated Fair Value	106	116
State, county and municipal securities
Held-to-Maturity:
Held-to-Maturity, Amortized Cost	153,679	160,192
Held-to-maturity Securities, Gross Unrealized Gain1	3,121	2,723
Held-to-maturity Securities, Gross Unrealized Loss1	(222)	(542)
Held-to-Maturity, Estimated Fair Value	156,578	162,373
Corporate securities
Held-to-Maturity:
Held-to-Maturity, Amortized Cost	52,918	53,032
Held-to-maturity Securities, Gross Unrealized Gain1	248	139
Held-to-maturity Securities, Gross Unrealized Loss1	(67)	(211)
Held-to-Maturity, Estimated Fair Value	53,099	52,960
Other Investments
Held-to-Maturity:
Held-to-Maturity, Amortized Cost	207	231
Held-to-maturity Securities, Gross Unrealized Gain1	1	1
Held-to-maturity Securities, Gross Unrealized Loss1	0	0
Held-to-Maturity, Estimated Fair Value	208	232
Other Investments
Available-for-Sale:
Available-for-Sale, Amortized Cost	2,951	2,951
Available-for-sale Securities, Gross Unrealized Gain1	16	21
Available-for-sale Securities, Gross Unrealized Loss1	0	0
Available-for-Sale, Estimated Fair Value	$ 2,967	$ 2,972

Investment Securities Realized

Investment Securities Realized Gains (Losses) on Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$ 2	$ 57
Gross realized losses	$ 0	$ (78)

Investment Securities Gross Unr

Investment Securities Gross Unrealized Losses and Fair Values of Investment Securities (Details) $ in Thousands	Mar. 31, 2017USD ($)securities	Dec. 31, 2016USD ($)securities
Available-for-Sale:
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 977,380	$ 1,063,374
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1	(12,053)	(19,560)
Available-for-Sale, 12 Months or More Fair Value	33,309	15,849
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or Longer, Aggregate Loss1	(596)	(500)
Available-for-Sale, Total Fair Value	1,010,689	1,079,223
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss1	(12,649)	(20,060)
Held-to-Maturity:
Held-to-Maturity, Less than 12 Months Fair Value	136,695	203,424
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1	(8,183)	(8,879)
Held-to-Maturity, 12 Months or More Fair Value	20,951	22,817
Held-to-Maturity, 12 Months or More Gross Unrealized Losses	(1,274)	(1,285)
Held-to-Maturity, Total Fair Value	157,646	226,241
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss1	$ (9,457)	$ (10,164)
Available-for-Sale and Held-to-Maturity:
Investment Securities in an Unrealized Loss Position (Number of Securities) | securities	319	396
US Treasury Securities [Member]
Available-for-Sale:
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 598	$ 598
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1	(1)	(1)
Available-for-Sale, 12 Months or More Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or Longer, Aggregate Loss1	0	0
Available-for-Sale, Total Fair Value	598	598
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss1	(1)	(1)
Obligations of U.S. government agencies
Available-for-Sale:
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	324,693	316,511
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1	(4,287)	(6,457)
Available-for-Sale, 12 Months or More Fair Value	9,984	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or Longer, Aggregate Loss1	(15)	0
Available-for-Sale, Total Fair Value	334,677	316,511
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss1	(4,302)	(6,457)
Held-to-Maturity:
Held-to-Maturity, Less than 12 Months Fair Value	19,655	19,575
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1	(82)	(162)
Held-to-Maturity, 12 Months or More Fair Value	0	0
Held-to-Maturity, 12 Months or More Gross Unrealized Losses	0	0
Held-to-Maturity, Total Fair Value	19,655	19,575
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss1	(82)	(162)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
Available-for-Sale:
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	652,089	746,265
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1	(7,765)	(13,102)
Available-for-Sale, 12 Months or More Fair Value	23,282	15,801
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or Longer, Aggregate Loss1	(580)	(499)
Available-for-Sale, Total Fair Value	675,371	762,066
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss1	(8,345)	(13,601)
Held-to-Maturity:
Held-to-Maturity, Less than 12 Months Fair Value	77,626	108,857
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1	(7,816)	(7,973)
Held-to-Maturity, 12 Months or More Fair Value	18,509	19,986
Held-to-Maturity, 12 Months or More Gross Unrealized Losses	(1,270)	(1,276)
Held-to-Maturity, Total Fair Value	96,135	128,843
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss1	(9,086)	(9,249)
Private mortgage-backed securities
Available-for-Sale:
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1	0	0
Available-for-Sale, 12 Months or More Fair Value	43	48
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or Longer, Aggregate Loss1	(1)	(1)
Available-for-Sale, Total Fair Value	43	48
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss1	(1)	(1)
State, county and municipal securities
Held-to-Maturity:
Held-to-Maturity, Less than 12 Months Fair Value	23,353	42,518
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1	(218)	(533)
Held-to-Maturity, 12 Months or More Fair Value	2,442	2,831
Held-to-Maturity, 12 Months or More Gross Unrealized Losses	(4)	(9)
Held-to-Maturity, Total Fair Value	25,795	45,349
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss1	(222)	(542)
Corporate securities
Held-to-Maturity:
Held-to-Maturity, Less than 12 Months Fair Value	16,061	32,474
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1	(67)	(211)
Held-to-Maturity, 12 Months or More Fair Value	0	0
Held-to-Maturity, 12 Months or More Gross Unrealized Losses	0	0
Held-to-Maturity, Total Fair Value	16,061	32,474
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss1	$ (67)	$ (211)

Maturities of Investment Securi

Maturities of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity
Available-for-Sale Amortized Cost, Within One Year	$ 326,690
Available-for-Sale Amortized Cost, After One Year but Within Five Years	1,108,186
Available-for-Sale Amortized Cost, After Five Years but Within Ten Years	164,443
Available-for-Sale Amortized Cost, After Ten Years	62,193
Available-for-Sale, Amortized Cost	1,661,512	$ 1,624,976
Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity
Available-for-Sale Estimated Fair Value, Within One Year	326,645
Available-for-Sale Estimated Fair Value, After One Year but Within Five Years	1,105,388
Available-for-Sale Estimated Fair Value, After Ten Years	163,370
Available-for-Sale Estimated Fair Value, After Five Years but Within Ten Years	62,188
Available-for-Sale, Estimated Fair Value	1,657,591	1,611,698
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount
Held-to-Maturity Amortized Cost, Within One Year	75,598
Held-to-Maturity Amortized Cost, After One Year but Within Five Years	278,753
Held-to-Maturity Amortized Cost, After Five Years but Within Ten Years	109,051
Held-to-Maturity Amortized Cost, After Ten Years	27,566
Held-to-Maturity, Amortized Cost	490,968	512,770
Held-to-maturity Securities, Debt Maturities, Fair Value, Rolling Maturity
Held-to-Maturity Estimated Fair Value, Within One Year	76,786
Held-to-Maturity Estimated Fair Value, After One Year but Within Five Years	278,372
Held-to-Maturity Estimated Fair Value, After Five Years but Within Ten Years	110,987
Held-to-Maturity Estimated Fair Value, After Ten Years	27,780
Held-to-Maturity, Estimated Fair Value	493,925	$ 513,273
Callable Within One Year
Available-for-sale Securities and Held-to-maturity Securities
Investment Securities Primarily Classified as Available-for-Sale, Amortized Costs, After One Year but Within Five Years	178,739
Investment Securities Primarily Classified as Available-for-Sale, Fair Value, After One Year but Within Five Years	$ 176,310

Schedule of Loans by Class (Det

Schedule of Loans by Class (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Loans and Leases Receivable [Line Items]
Loans held for investment	$ 5,376,542	$ 5,416,750
Mortgage loans held for sale	23,237	61,794
Total loans	5,399,779	5,478,544
Commercial real estate
Loans and Leases Receivable [Line Items]
Loans held for investment	1,819,654	1,834,445
Land acquisition & development construction real estate
Loans and Leases Receivable [Line Items]
Loans held for investment	200,412	208,512
Residential construction real estate
Loans and Leases Receivable [Line Items]
Loans held for investment	143,852	147,896
Commercial construction real estate
Loans and Leases Receivable [Line Items]
Loans held for investment	121,154	125,589
Total construction loans
Loans and Leases Receivable [Line Items]
Loans held for investment	465,418	481,997
Residential real estate
Loans and Leases Receivable [Line Items]
Loans held for investment	1,004,045	1,027,393
Agricultural real estate
Loans and Leases Receivable [Line Items]
Loans held for investment	167,749	170,248
Total real estate loans
Loans and Leases Receivable [Line Items]
Loans held for investment	3,456,866	3,514,083
Indirect consumer
Loans and Leases Receivable [Line Items]
Loans held for investment	762,477	752,409
Other consumer
Loans and Leases Receivable [Line Items]
Loans held for investment	145,443	148,087
Credit card consumer
Loans and Leases Receivable [Line Items]
Loans held for investment	65,241	69,770
Total consumer loans
Loans and Leases Receivable [Line Items]
Loans held for investment	973,161	970,266
Commercial
Loans and Leases Receivable [Line Items]
Loans held for investment	817,841	797,942
Agricultural
Loans and Leases Receivable [Line Items]
Loans held for investment	125,492	132,858
Other, including overdrafts
Loans and Leases Receivable [Line Items]
Loans held for investment	$ 3,182	$ 1,601

Schedule of Recorded Investment

Schedule of Recorded Investment in Past Due Loans by Class (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Mortgage loans held for sale	$ 23,237		$ 61,794
Loans held for investment	5,376,542		5,416,750
Total loans	5,399,779		5,478,544
Interest Income on Non-Accrual Loans if Accrued	874	$ 790
Commercial real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	6,034		8,709
Current Loans	1,784,284		1,799,525
Non-accrual Loans	29,336		26,211
Loans held for investment	1,819,654		1,834,445
Land acquisition & development construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	563		1,264
Current Loans	194,943		202,223
Non-accrual Loans	4,906		5,025
Loans held for investment	200,412		208,512
Residential construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	2,124		1,195
Current Loans	141,288		146,245
Non-accrual Loans	440		456
Loans held for investment	143,852		147,896
Commercial construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	231		0
Current Loans	116,542		124,827
Non-accrual Loans	4,381		762
Loans held for investment	121,154		125,589
Total construction loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	2,918		2,459
Current Loans	452,773		473,295
Non-accrual Loans	9,727		6,243
Loans held for investment	465,418		481,997
Residential real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	9,041		5,968
Current Loans	988,838		1,014,990
Non-accrual Loans	6,166		6,435
Loans held for investment	1,004,045		1,027,393
Agricultural real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	1,336		628
Current Loans	164,724		165,293
Non-accrual Loans	1,689		4,327
Loans held for investment	167,749		170,248
Total real estate loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	19,329		17,764
Current Loans	3,390,619		3,453,103
Non-accrual Loans	46,918		43,216
Loans held for investment	3,456,866		3,514,083
Indirect consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	7,783		11,466
Current Loans	753,337		740,163
Non-accrual Loans	1,357		780
Loans held for investment	762,477		752,409
Other consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	1,278		1,724
Current Loans	143,881		146,006
Non-accrual Loans	284		357
Loans held for investment	145,443		148,087
Credit card consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	1,522		1,404
Current Loans	63,719		68,366
Non-accrual Loans	0		0
Loans held for investment	65,241		69,770
Total consumer loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	10,583		14,594
Current Loans	960,937		954,535
Non-accrual Loans	1,641		1,137
Loans held for investment	973,161		970,266
Commercial
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	5,620		4,632
Current Loans	787,125		767,878
Non-accrual Loans	25,096		25,432
Loans held for investment	817,841		797,942
Agricultural
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	2,991		1,894
Current Loans	121,576		127,956
Non-accrual Loans	925		3,008
Loans held for investment	125,492		132,858
Other, including overdrafts
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		312
Current Loans	3,182		1,289
Non-accrual Loans	0		0
Loans held for investment	3,182		1,601
Loans held for investment
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	38,523		39,196
Current Loans	5,263,439		5,304,761
Non-accrual Loans	74,580		72,793
Loans held for investment	5,376,542		5,416,750
Mortgage loans originated for sale
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		0
Current Loans	23,237		61,794
Non-accrual Loans	0		0
Total loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	38,523		39,196
Current Loans	5,286,676		5,366,555
Non-accrual Loans	74,580		72,793
Total loans	5,399,779		5,478,544
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	4,936		7,307
Financing Receivables, 30 to 59 Days Past Due [Member] | Land acquisition & development construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	398		633
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	1,418		931
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	231		0
Financing Receivables, 30 to 59 Days Past Due [Member] | Total construction loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	2,047		1,564
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	7,487		3,986
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	1,014		341
Financing Receivables, 30 to 59 Days Past Due [Member] | Total real estate loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	15,484		13,198
Financing Receivables, 30 to 59 Days Past Due [Member] | Indirect consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	5,742		8,425
Financing Receivables, 30 to 59 Days Past Due [Member] | Other consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	794		1,322
Financing Receivables, 30 to 59 Days Past Due [Member] | Credit card consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	628		504
Financing Receivables, 30 to 59 Days Past Due [Member] | Total consumer loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	7,164		10,251
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	3,176		3,171
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	2,738		1,518
Financing Receivables, 30 to 59 Days Past Due [Member] | Other, including overdrafts
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		0
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans held for investment
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	28,562		28,138
Financing Receivables, 30 to 59 Days Past Due [Member] | Mortgage loans originated for sale
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		0
Financing Receivables, 30 to 59 Days Past Due [Member] | Total loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	28,562		28,138
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	776		1,099
Financing Receivables, 60 to 89 Days Past Due [Member] | Land acquisition & development construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	165		352
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		264
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		0
Financing Receivables, 60 to 89 Days Past Due [Member] | Total construction loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	165		616
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	463		1,280
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		287
Financing Receivables, 60 to 89 Days Past Due [Member] | Total real estate loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	1,404		3,282
Financing Receivables, 60 to 89 Days Past Due [Member] | Indirect consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	1,525		2,329
Financing Receivables, 60 to 89 Days Past Due [Member] | Other consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	425		235
Financing Receivables, 60 to 89 Days Past Due [Member] | Credit card consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	264		333
Financing Receivables, 60 to 89 Days Past Due [Member] | Total consumer loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	2,214		2,897
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	1,733		727
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	83		362
Financing Receivables, 60 to 89 Days Past Due [Member] | Other, including overdrafts
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		1
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans held for investment
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	5,434		7,269
Financing Receivables, 60 to 89 Days Past Due [Member] | Mortgage loans originated for sale
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		0
Financing Receivables, 60 to 89 Days Past Due [Member] | Total loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	5,434		7,269
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	322		303
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Land acquisition & development construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		279
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	706		0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Total construction loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	706		279
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	1,091		702
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Agricultural real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	322		0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Total real estate loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	2,441		1,284
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Indirect consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	516		712
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Other consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	59		167
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Credit card consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	630		567
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Total consumer loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	1,205		1,446
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	711		734
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Agricultural
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	170		14
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Other, including overdrafts
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		311
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans held for investment
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	4,527		3,789
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Mortgage loans originated for sale
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Total loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	$ 4,527		$ 3,789

Loans Schedule of Loans Acquire

Loans Schedule of Loans Acquired from Business Combinations (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]
Outstanding Balance	$ 32,623	$ 33,175
Carrying Amount Net, Accrual Status	18,920	21,064
Total Carrying Value	$ 18,920	$ 21,064

Loans Certain Loans Acquired in

Loans Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning Balance	$ 6,803	$ 6,713
Additions	0	0
Accretion Income	(605)	(614)
Reductions Due to Exit Events	(570)	(147)
Reclassifications from (to) nonaccretable differences	804	726
Ending Balance	$ 6,432	$ 6,678

Loans Schedule of Recorded Inve

Loans Schedule of Recorded Investment in Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	$ 124,649		$ 132,785
Recorded Investment With No Allowance	50,432		57,992
Recorded Investment With Allowance	47,314		46,699
Total Recorded Investment	97,746		104,691
Related Allowance	15,465		13,954
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	101,220	$ 76,535
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Income Recognized	227	60
Interest Income on Impaired Loans If Interest Had Been Accrued	874	790
Commercial real estate
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	55,648		57,017
Recorded Investment With No Allowance	24,392		24,410
Recorded Investment With Allowance	20,218		21,420
Total Recorded Investment	44,610		45,830
Related Allowance	4,105		2,847
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	45,220	33,483
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Income Recognized	125	36
Land acquisition & development construction real estate
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	11,391		12,084
Recorded Investment With No Allowance	3,886		4,330
Recorded Investment With Allowance	1,578		1,813
Total Recorded Investment	5,464		6,143
Related Allowance	939		826
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	5,804	7,508
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Income Recognized	4	7
Residential construction real estate
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	933		1,555
Recorded Investment With No Allowance	214		219
Recorded Investment With Allowance	0		619
Total Recorded Investment	214		838
Related Allowance	35		1
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	526	288
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Income Recognized	0	0
Commercial construction real estate
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	4,734		4,786
Recorded Investment With No Allowance	228		3,940
Recorded Investment With Allowance	4,267		647
Total Recorded Investment	4,495		4,587
Related Allowance	2,870		657
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	4,541	1,067
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Income Recognized	43	0
Total construction loans
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	17,058		18,425
Recorded Investment With No Allowance	4,328		8,489
Recorded Investment With Allowance	5,845		3,079
Total Recorded Investment	10,173		11,568
Related Allowance	3,844		1,484
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	10,871	8,863
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Income Recognized	47	7
Residential real estate
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	8,184		8,222
Recorded Investment With No Allowance	4,371		4,074
Recorded Investment With Allowance	2,283		2,470
Total Recorded Investment	6,654		6,544
Related Allowance	111		253
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	6,599	4,206
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Income Recognized	4	1
Agricultural real estate
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	2,436		5,069
Recorded Investment With No Allowance	1,890		4,509
Recorded Investment With Allowance	185		181
Total Recorded Investment	2,075		4,690
Related Allowance	6		4
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	3,383	5,748
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Income Recognized	0	1
Total real estate loans
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	83,326		88,733
Recorded Investment With No Allowance	34,981		41,482
Recorded Investment With Allowance	28,531		27,150
Total Recorded Investment	63,512		68,632
Related Allowance	8,066		4,588
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	66,073	52,300
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Income Recognized	176	45
Commercial
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	40,135		40,314
Recorded Investment With No Allowance	14,760		13,230
Recorded Investment With Allowance	18,319		19,167
Total Recorded Investment	33,079		32,397
Related Allowance	7,176		9,254
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	32,738	23,379
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Income Recognized	49	15
Agricultural
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	1,188		3,738
Recorded Investment With No Allowance	691		3,280
Recorded Investment With Allowance	464		382
Total Recorded Investment	1,155		3,662
Related Allowance	223		$ 112
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	2,409	856
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Income Recognized	$ 2	$ 0

Schedule of Loans Renegotiated

Schedule of Loans Renegotiated in Troubled Debt Restructurings (Details)	3 Months Ended
	Mar. 31, 2017USD ($)notes	Mar. 31, 2016USD ($)	Dec. 31, 2016USD ($)
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Loans Renegotiated in Troubled Debt Restructurings	$ 55,255,000		$ 49,652,000
Loans Renegotiated in Troubled Debt Restructurings, Non-Accrual Loans	38,876,000		27,309,000
Loans Renegotiated in Troubled Debt Restructurings, Accrual Loans	$ 16,379,000		$ 22,343,000
Number of Notes | notes	17
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 9,990,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 0	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 0
Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	1,970,000
Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	2,130,000
Interest Rate Adjustment Concession [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0
Other Concession [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 5,890,000
Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes | notes	4
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 2,546,000
Commercial real estate | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	1,475,000
Commercial real estate | Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	162,000
Commercial real estate | Interest Rate Adjustment Concession [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0
Commercial real estate | Other Concession [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 909,000
Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes | notes	13
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 7,444,000
Commercial | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	495,000
Commercial | Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	1,968,000
Commercial | Interest Rate Adjustment Concession [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0
Commercial | Other Concession [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 4,981,000

Schedule of Recorded Investme45

Schedule of Recorded Investment in Criticized Loans by Class and Credit Quality Indicator (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	$ 5,376,542	$ 5,416,750
Commercial real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	1,819,654	1,834,445
Land acquisition & development construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	200,412	208,512
Residential construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	143,852	147,896
Commercial construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	121,154	125,589
Total construction loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	465,418	481,997
Residential real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	1,004,045	1,027,393
Agricultural real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	167,749	170,248
Total real estate loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	3,456,866	3,514,083
Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	762,477	752,409
Other consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	145,443	148,087
Credit card consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	65,241	69,770
Total consumer loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	973,161	970,266
Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	817,841	797,942
Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	125,492	132,858
Other Assets Especially Mentioned
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	144,806	163,581
Other Assets Especially Mentioned | Commercial real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	73,394	85,292
Other Assets Especially Mentioned | Land acquisition & development construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	16,793	13,414
Other Assets Especially Mentioned | Residential construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	2,043	412
Other Assets Especially Mentioned | Commercial construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	1,494	1,555
Other Assets Especially Mentioned | Total construction loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	20,330	15,381
Other Assets Especially Mentioned | Residential real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	4,616	5,038
Other Assets Especially Mentioned | Agricultural real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	4,595	3,831
Other Assets Especially Mentioned | Total real estate loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	102,935	109,542
Other Assets Especially Mentioned | Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	471	778
Other Assets Especially Mentioned | Other consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	586	681
Other Assets Especially Mentioned | Credit card consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	0
Other Assets Especially Mentioned | Total consumer loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	1,057	1,459
Other Assets Especially Mentioned | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	33,368	46,402
Other Assets Especially Mentioned | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	7,446	6,178
Substandard
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	200,347	172,325
Substandard | Commercial real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	90,127	85,293
Substandard | Land acquisition & development construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	6,754	6,214
Substandard | Residential construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	2,724	1,621
Substandard | Commercial construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	3,385	6,344
Substandard | Total construction loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	12,863	14,179
Substandard | Residential real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	11,766	12,472
Substandard | Agricultural real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	14,517	17,813
Substandard | Total real estate loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	129,273	129,757
Substandard | Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	2,096	1,527
Substandard | Other consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	962	1,036
Substandard | Credit card consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	127
Substandard | Total consumer loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	3,185	2,563
Substandard | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	54,963	29,281
Substandard | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	12,926	10,724
Doubtful
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	38,409	36,336
Doubtful | Commercial real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	12,118	10,842
Doubtful | Land acquisition & development construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	1,400	1,401
Doubtful | Residential construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	620	656
Doubtful | Commercial construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	4,284	664
Doubtful | Total construction loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	6,304	2,721
Doubtful | Residential real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	922	764
Doubtful | Agricultural real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	0	0
Doubtful | Total real estate loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	19,344	14,327
Doubtful | Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	76	101
Doubtful | Other consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	213	264
Doubtful | Credit card consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	0
Doubtful | Total consumer loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	289	365
Doubtful | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	18,029	21,240
Doubtful | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	747	404
Total Criticized Loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	383,562	372,242
Total Criticized Loans | Commercial real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	175,639	181,427
Total Criticized Loans | Land acquisition & development construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	24,947	21,029
Total Criticized Loans | Residential construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	5,387	2,689
Total Criticized Loans | Commercial construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	9,163	8,563
Total Criticized Loans | Total construction loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	39,497	32,281
Total Criticized Loans | Residential real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	17,304	18,274
Total Criticized Loans | Agricultural real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	19,112	21,644
Total Criticized Loans | Total real estate loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	251,552	253,626
Total Criticized Loans | Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	2,643	2,406
Total Criticized Loans | Other consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	1,761	1,981
Total Criticized Loans | Credit card consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	127
Total Criticized Loans | Total consumer loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	4,531	4,387
Total Criticized Loans | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	106,360	96,923
Total Criticized Loans | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	$ 21,119	$ 17,306

Schedule of Allowance for Loan

Schedule of Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment			$ 565	$ 427
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 76,214	$ 76,817
Provision charged to operating expense	1,730	4,000
Less loans charged-off	(3,855)	(4,302)
Add back recoveries of loans previously charged-off	2,142	3,409
Ending balance	76,231	79,924
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans individually evaluated for impairment			15,465	13,954
Loans collectively evaluated for impairment			60,766	62,260
Ending balance	76,214	76,817	76,231	76,214
Total loans:
Individually evaluated for impairment			97,746	104,691
Individually evaluated for impairment			5,278,796	5,312,059
Total loans			5,376,542	5,416,750
Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	28,625	52,296
Provision charged to operating expense	4,387	(16,081)
Less loans charged-off	(444)	(1,922)
Add back recoveries of loans previously charged-off	524	2,359
Ending balance	33,092	36,652
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans individually evaluated for impairment			8,066	4,588
Loans collectively evaluated for impairment			25,026	24,037
Ending balance	28,625	52,296	33,092	28,625
Total loans:
Individually evaluated for impairment			63,512	68,632
Individually evaluated for impairment			3,393,354	3,445,451
Total loans			3,456,866	3,514,083
Total consumer loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,711	5,144
Provision charged to operating expense	2,048	1,229
Less loans charged-off	(2,596)	(1,892)
Add back recoveries of loans previously charged-off	1,205	775
Ending balance	8,368	5,256
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans individually evaluated for impairment			0	0
Loans collectively evaluated for impairment			8,368	7,711
Ending balance	7,711	5,144	8,368	7,711
Total loans:
Individually evaluated for impairment			0	0
Individually evaluated for impairment			973,161	970,266
Total loans			973,161	970,266
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	38,092	18,775
Provision charged to operating expense	(4,128)	17,690
Less loans charged-off	(793)	(488)
Add back recoveries of loans previously charged-off	391	275
Ending balance	33,562	36,252
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans individually evaluated for impairment			7,176	9,254
Loans collectively evaluated for impairment			26,386	28,838
Ending balance	38,092	18,775	33,562	38,092
Total loans:
Individually evaluated for impairment			33,079	32,397
Individually evaluated for impairment			784,762	765,545
Total loans			817,841	797,942
Agriculture
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,786	602
Provision charged to operating expense	(577)	1,162
Less loans charged-off	(22)	0
Add back recoveries of loans previously charged-off	22	0
Ending balance	1,209	1,764
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans individually evaluated for impairment			223	112
Loans collectively evaluated for impairment			986	1,674
Ending balance	1,786	602	1,209	1,786
Total loans:
Individually evaluated for impairment			1,155	3,662
Individually evaluated for impairment			124,337	129,196
Total loans			125,492	132,858
Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	0
Provision charged to operating expense	0	0
Less loans charged-off	0	0
Add back recoveries of loans previously charged-off	0	0
Ending balance	0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans individually evaluated for impairment			0	0
Loans collectively evaluated for impairment			0	0
Ending balance	$ 0	$ 0	0	0
Total loans:
Individually evaluated for impairment			0	0
Individually evaluated for impairment			3,182	1,601
Total loans			$ 3,182	$ 1,601

OREO (Details)

OREO (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Mortgage Loans in Process of Foreclosure, Amount	$ 0
Real Estate Acquired Through Foreclosure [Roll Forward]
Beginning balance	10,019	$ 6,254
Additions	368	3,227
Valuation adjustments	(47)	(17)
Dispositions	(912)	(207)
Ending balance	9,428	$ 9,257
Residential real estate
Real Estate Acquired Through Foreclosure [Roll Forward]
Beginning balance	2,282
Ending balance	$ 2,538

Derivatives and Hedging (Detail

Derivatives and Hedging (Details) - USD ($) $ in Thousands	Sep. 22, 2015	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Derivative [Line Items]
Derivative, Inception Date	Sep. 22, 2015
Derivative, Fixed Interest Rate	1.94%
Derivative Asset, Notional Amount		$ 215,103		$ 253,851
Interest Rate Derivative Assets, at Fair Value		3,023		2,749
Derivative Liability, Notional Amount	$ 100,000	137,192		153,593
Interest Rate Derivative Liabilities, at Fair Value		1,688		1,314
Interest Rate Swap
Derivative [Line Items]
Derivative Liability, Notional Amount		100,000
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion		49
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion			$ (2,197)
Designated as Hedging Instrument [Member] | Interest Rate Swap
Derivative [Line Items]
Derivative Asset, Notional Amount		100,000		0
Interest Rate Derivative Assets, at Fair Value		16		0
Derivative Liability, Notional Amount		0		100,000
Interest Rate Derivative Liabilities, at Fair Value		0		33
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Loss on Derivative		(39)	(29)
Fee Income on Derivatives		(42)	0
Gain (Loss) on Fair Value Hedges Recognized in Earnings		(109)	$ 695
Not Designated as Hedging Instrument [Member] | Interest Rate Swap
Derivative [Line Items]
Derivative Asset, Notional Amount		53,188		53,593
Interest Rate Derivative Assets, at Fair Value		1,295		1,332
Derivative Liability, Notional Amount		53,188		53,593
Interest Rate Derivative Liabilities, at Fair Value		1,283		1,281
Not Designated as Hedging Instrument [Member] | Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount		61,915		73,422
Interest Rate Derivative Assets, at Fair Value		1,712		1,131
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount		0		126,836
Interest Rate Derivative Assets, at Fair Value		0		286
Derivative Liability, Notional Amount		84,004		0
Interest Rate Derivative Liabilities, at Fair Value		$ 405		$ 0

Capital Stock (Details)

Capital Stock (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Class of Stock [Line Items]
Payments for Repurchase of Common Stock	$ 859	$ 25,309
Class A Common Stock
Class of Stock [Line Items]
Common Stock, Shares, Outstanding	21,926,590		21,613,885
Stock Repurchased and Retired During Period, Shares		948,242
Payments for Repurchase of Common Stock		$ 24,792
Stock Repurchase Program, Remaining Authorized Repurchase Amount	24,123
Class B Common Stock
Class of Stock [Line Items]
Common Stock, Shares, Outstanding	23,217,418		23,312,291

Computation of Basic and Dilute

Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net Income (Loss) Available to Common Stockholders, Basic
Net income	$ 23,126	$ 20,124
Weighted Average Number of Shares Outstanding, Basic and Diluted
Weighted average common shares outstanding for basic earnings per share computation	44,680,258	44,719,218
Dilutive effect of stock-based compensation	558,650	394,834
Weighted average common shares outstanding for diluted earnings per common share computation	45,238,908	45,114,052
Earnings Per Share, Basic and Diluted
Basic earnings per common share	$ 0.52	$ 0.45
Diluted earnings per common share	$ 0.51	$ 0.45
Performance Shares [Member]
Earnings Per Share, Basic and Diluted [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	187,680	226,821
Unvested Restricted Stock
Earnings Per Share, Basic and Diluted [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	96,897	40,865

Schedule of Actual Capital Amou

Schedule of Actual Capital Amounts and Ratios and Selected Minimum Regulatory Thresholds (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Total risk-based capital:
Actual Amount	$ 957,008	$ 974,488
Actual Ratio	14.94%	15.13%
Well Capitalized Amount	$ 640,626	$ 643,876
Well Capitalized Ratio	10.00%	10.00%
Tier 1 risk-based capital:
Actual Amount	$ 880,777	$ 894,273
Actual Ratio	13.75%	13.89%
Well Capitalized Amount	$ 512,501	$ 515,101
Well Capitalized Ratio	8.00%	8.00%
Common equity tier one risk-based capital:
Actual Amount	$ 800,777	$ 814,273
Actual Ratio	12.50%	12.65%
Leverage capital ratio:
Actual Amount	$ 880,777	$ 894,273
Actual Ratio	10.09%	10.11%
Adequately Capitalized Amount	$ 349,244	$ 353,838
Adequately Capitalized Ratio	4.00%	4.00%
Well Capitalized Amount	$ 436,555	$ 442,297
Well Capitalized Ratio	5.00%	5.00%
Capital Required for Capital Adequacy under Basel III Phase-in Schedule	$ 592,579	$ 555,665
Capital Required for Capital Adequacy under Basel III Phase-in Schedule to Risk Weighted Assets	9.25%	8.63%
Capital Required for Capital Adequacy under Basel III Fully Phased-in	$ 672,658	$ 676,070
Capital Required for Capital Adequacy under Basel III Fully Phased-in to Risk Weighted Assets	10.50%	10.50%
Tier One Risk Based Capital under Basel III Phase-in Schedule	$ 464,454	$ 426,890
Tier One Capital Required for Capital Adequacy under Basel III Phase-in Schedule to Risk Weighted Assets	7.25%	6.63%
Tier One Capital Required for Capital Adequacy under Basel III Fully Phased-in	$ 544,532	$ 547,295
Tier One Capital Required for Capital Adequacy under Basel III Fully Phased-in to Risk Weighted Assets	8.50%	8.50%
Common Equity Tier One Capital Required for Capital Adequacy under Basel III Phase-in Schedule	$ 368,360	$ 330,308
Common Equity Tier One Capital Required for Capital Adequacy under Basel III Phase-in Schedule to Risk Weighted Assets	5.75%	5.13%
Tier One Common Equity Capital Required for Capital Adequacy under Basel III Fully Phased-in	$ 448,438	$ 450,713
Tier One Common Equity Capital Required for Capital Adequacy under Basel III Fully Phased-in to Risk Weighted Assets	7.00%	7.00%
Common Equity Tier One Capital to be Well Capitalized	$ 416,407	$ 418,519
Common Equity Tier One Capital to be Well Capitalized to Risk Weighted Assets	6.50%	6.50%
FIB
Total risk-based capital:
Actual Amount	$ 861,953	$ 841,967
Actual Ratio	13.52%	13.13%
Well Capitalized Amount	$ 637,759	$ 641,320
Well Capitalized Ratio	10.00%	10.00%
Tier 1 risk-based capital:
Actual Amount	$ 785,722	$ 765,753
Actual Ratio	12.32%	11.94%
Well Capitalized Amount	$ 510,207	$ 513,056
Well Capitalized Ratio	8.00%	8.00%
Common equity tier one risk-based capital:
Actual Amount	$ 785,722	$ 765,753
Actual Ratio	12.32%	11.94%
Leverage capital ratio:
Actual Amount	$ 785,722	$ 765,753
Actual Ratio	9.02%	8.69%
Adequately Capitalized Amount	$ 348,525	$ 352,283
Adequately Capitalized Ratio	4.00%	4.00%
Well Capitalized Amount	$ 435,656	$ 440,353
Well Capitalized Ratio	5.00%	5.00%
Capital Required for Capital Adequacy under Basel III Phase-in Schedule	$ 589,927	$ 553,459
Capital Required for Capital Adequacy under Basel III Phase-in Schedule to Risk Weighted Assets	9.25%	8.63%
Capital Required for Capital Adequacy under Basel III Fully Phased-in	$ 669,646	$ 673,386
Capital Required for Capital Adequacy under Basel III Fully Phased-in to Risk Weighted Assets	10.50%	10.50%
Tier One Risk Based Capital under Basel III Phase-in Schedule	$ 462,375	$ 425,195
Tier One Capital Required for Capital Adequacy under Basel III Phase-in Schedule to Risk Weighted Assets	7.25%	6.63%
Tier One Capital Required for Capital Adequacy under Basel III Fully Phased-in	$ 542,095	$ 545,122
Tier One Capital Required for Capital Adequacy under Basel III Fully Phased-in to Risk Weighted Assets	8.50%	8.50%
Common Equity Tier One Capital Required for Capital Adequacy under Basel III Phase-in Schedule	$ 366,711	$ 328,997
Common Equity Tier One Capital Required for Capital Adequacy under Basel III Phase-in Schedule to Risk Weighted Assets	5.75%	5.13%
Tier One Common Equity Capital Required for Capital Adequacy under Basel III Fully Phased-in	$ 446,431	$ 448,924
Tier One Common Equity Capital Required for Capital Adequacy under Basel III Fully Phased-in to Risk Weighted Assets	7.00%	7.00%
Common Equity Tier One Capital to be Well Capitalized	$ 414,543	$ 416,858
Common Equity Tier One Capital to be Well Capitalized to Risk Weighted Assets	6.50%	6.50%

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 22, 2015
Loss Contingencies [Line Items]
Derivative Liability, Notional Amount	$ 137,192	$ 153,593	$ 100,000
Commitments to Complete Contracts in Process	2,515
Interest Rate Swap
Loss Contingencies [Line Items]
Derivative Liability, Notional Amount	$ 100,000
Mortgage Loans Held for Sale
Loss Contingencies [Line Items]
Guarantor Obligations, Recourse Provisions	1,127

Financial Instruments with Of53

Financial Instruments with Off-Balance Sheet Risk (Details) $ in Thousands	Mar. 31, 2017USD ($)
Entity Information [Line Items]
Credit Extension Commitments	$ 1,596,930
Credit Extension Commitments, Beyond One Year	416,411
Standby Letters of Credit
Entity Information [Line Items]
Credit Extension Commitments	50,022
Unused Credit Card Lines
Entity Information [Line Items]
Credit Extension Commitments	$ 550,354

Schedule of Comprehensive Incom

Schedule of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Change in net unrealized Gain during period:
Change in net unrealized gain during period, before tax amount	$ 9,354	$ 8,613
Change in net unrealized gain during period, tax expense (benefit)	3,681	3,360
Change in net unrealized gain during period, net of tax amount	5,673	5,253
Reclassification adjustment for gains included in net income:
Reclassification adjustment for gains included in net income, before tax amount	(2)	21
Reclassification adjustment for gains included in net income, tax expense (benefit)	(1)	8
Reclassification adjustment for gains included in net income, net of tax amount	(1)	13
Change in unamortized loss on available-for-sale securities transferred into held-to-maturity	463	465
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Tax	182	183
Change in unamortized loss on available-for-sale securities transferred into held-to-maturity	281	282
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	49	(2,197)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	19	(835)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	30	(1,362)
Change in net actuarial loss:
Change in net actuarial loss, before tax amount	(739)	15
Change in net actuarial loss, tax expense (benefit)	(291)	6
Change in net actuarial loss, net of tax amount	(448)	9
Other comprehensive income (loss):
Other comprehensive income (loss), before tax	9,125	6,917
Total other comprehensive income, tax expense (benefit)	3,590	2,722
Total other comprehensive income, net of tax amount	$ 5,535	$ 4,195

Schedule of Accumulated Other C

Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Net accumulated other comprehensive income:
Net unrealized gain on investment securities available-for-sale	$ (4,190)	$ (10,143)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	1,590	2,038
Net actuarial loss on defined benefit post-retirement benefit plans	7	(23)
Net accumulated other comprehensive income	$ (2,593)	$ (8,128)

Schedule of Financial Assets an

Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring and Non-Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real Estate Acquired Through Foreclosure, Valuation Adjustments	$ 47	$ 17
Related Allowance	15,465		$ 13,954
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	0		0
Deferred compensation asset at fair value amount	0		0
Deferred compensation plan liabilities at fair value amount	0		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0		0
Other real estate owned	0		0
Long-lived assets to be disposed of by sale	0		0
Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	23,237		61,794
Deferred compensation asset at fair value amount	11,108		10,627
Deferred compensation plan liabilities at fair value amount	11,108		10,627
Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0		0
Other real estate owned	0		0
Long-lived assets to be disposed of by sale	0		0
Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	0		0
Deferred compensation asset at fair value amount	0		0
Deferred compensation plan liabilities at fair value amount	0		0
Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans			39,344
Other real estate owned	1,682		2,110
Real Estate Acquired Through Foreclosure, Valuation Adjustments	47	17
Impairment of real estate, received updated appraisal	16	11
Impairment of Real Estate, Change in Management Estimates	31	$ 6
Long-lived assets to be disposed of by sale	356		1,335
Related Allowance	14,901		13,954
Impaired Financing Receivable, Related Allowance, Partial Loan Charge-Offs	10,919		11,941
US Treasury Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0
US Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	3,612		3,612
US Treasury Securities [Member] | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0
Obligations of U.S. government agencies | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0
Obligations of U.S. government agencies | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	407,243		391,297
Obligations of U.S. government agencies | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	1,243,663		1,213,701
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0
Private mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0
Private mortgage-backed securities | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	106		116
Private mortgage-backed securities | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0
Other Investments | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0
Other Investments | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	2,967		2,972
Other Investments | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	1,657,591		1,611,698
Loans Receivable, Fair Value Disclosure	5,148,977		5,248,127
Derivative Asset	3,023		2,749
Derivative Liability	1,688		1,314
Mortgages Held-for-sale, Fair Value Disclosure	23,237		61,794
Deferred compensation asset at fair value amount	11,108		10,627
Deferred compensation plan liabilities at fair value amount	11,108		10,627
Estimated Fair Value | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	23,237		61,794
Deferred compensation asset at fair value amount	11,108		10,627
Deferred compensation plan liabilities at fair value amount	11,108		10,627
Estimated Fair Value | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	37,484		39,344
Other real estate owned	1,682		2,110
Long-lived assets to be disposed of by sale	356		1,335
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0
Loans Receivable, Fair Value Disclosure	0		0
Derivative Asset	0		0
Derivative Liability	0		0
Mortgages Held-for-sale, Fair Value Disclosure	0		0
Deferred compensation asset at fair value amount	0		0
Deferred compensation plan liabilities at fair value amount	0		0
Estimated Fair Value | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	1,657,591		1,611,698
Loans Receivable, Fair Value Disclosure	5,111,493		5,208,783
Derivative Asset	3,023		2,749
Derivative Liability	1,688		1,314
Mortgages Held-for-sale, Fair Value Disclosure	23,237		61,794
Deferred compensation asset at fair value amount	11,108		10,627
Deferred compensation plan liabilities at fair value amount	11,108		10,627
Estimated Fair Value | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0
Loans Receivable, Fair Value Disclosure	37,484		39,344
Derivative Asset	0		0
Derivative Liability	0		0
Mortgages Held-for-sale, Fair Value Disclosure	0
Deferred compensation asset at fair value amount	0		0
Deferred compensation plan liabilities at fair value amount	0		0
Estimated Fair Value | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	37,484		39,344
Estimated Fair Value | US Treasury Securities [Member] | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	3,612		3,612
Estimated Fair Value | Obligations of U.S. government agencies | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	407,243		391,297
Estimated Fair Value | U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	1,243,663		1,213,701
Estimated Fair Value | Private mortgage-backed securities | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	106		116
Estimated Fair Value | Other Investments | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	2,967		2,972
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	1,657,591		1,611,698
Loans Receivable, Fair Value Disclosure	5,300,311		5,340,536
Derivative Asset	3,023		2,749
Derivative Liability	1,688		1,314
Mortgages Held-for-sale, Fair Value Disclosure	23,237		61,794
Deferred compensation asset at fair value amount	11,108		10,627
Deferred compensation plan liabilities at fair value amount	11,108		10,627
Carrying Amount | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	63,304		65,238
Long-lived assets to be disposed of by sale	565		2,363
Change During Period | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets to be disposed of by sale	209		1,028
Interest Rate Swap | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0		0
Derivative Liability	0		0
Interest Rate Swap | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	1,311		1,332
Derivative Liability	1,283		1,314
Interest Rate Swap | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0		0
Derivative Liability	0		0
Interest Rate Swap | Estimated Fair Value | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	1,311		1,332
Derivative Liability	1,283		1,314
Interest Rate Lock Commitments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0		0
Interest Rate Lock Commitments [Member] | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	1,712		1,131
Interest Rate Lock Commitments [Member] | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0		0
Interest Rate Lock Commitments [Member] | Estimated Fair Value | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	1,712		1,131
Forward Contracts [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset			0
Derivative Liability	0
Forward Contracts [Member] | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset			286
Derivative Liability	405
Forward Contracts [Member] | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset			0
Derivative Liability	0
Forward Contracts [Member] | Estimated Fair Value | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset			$ 286
Derivative Liability	$ 405

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value Inputs, Quantitative Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Loans and Leases Receivable, Impaired Loans | Minimum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	(0.00%)
Loans and Leases Receivable, Impaired Loans | Maximum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	(66.00%)
Loans and Leases Receivable, Impaired Loans | Weighted Average | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	(31.00%)
Real Estate Acquired in Satisfaction of Debt | Minimum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	(8.00%)
Real Estate Acquired in Satisfaction of Debt | Maximum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	(96.00%)
Real Estate Acquired in Satisfaction of Debt | Weighted Average | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	(18.00%)
Asses to be Disposed of by Sale | Minimum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	(0.00%)
Asses to be Disposed of by Sale | Maximum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	(9.00%)
Asses to be Disposed of by Sale | Weighted Average | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	(6.00%)
Carrying Amount
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans Receivable, Fair Value Disclosure	$ 5,300,311	$ 5,340,536
Change During Period | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-lived assets to be disposed of by sale	209	1,028
Estimated Fair Value
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans Receivable, Fair Value Disclosure	5,148,977	5,248,127
Estimated Fair Value | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	37,484	39,344
Long-lived assets to be disposed of by sale	356	1,335
Other real estate owned	1,682	2,110
Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans		39,344
Long-lived assets to be disposed of by sale	356	1,335
Other real estate owned	1,682	2,110
Significant Unobservable Inputs (Level 3) | Carrying Amount | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	63,304	65,238
Long-lived assets to be disposed of by sale	565	2,363
Significant Unobservable Inputs (Level 3) | Estimated Fair Value
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans Receivable, Fair Value Disclosure	37,484	39,344
Significant Unobservable Inputs (Level 3) | Estimated Fair Value | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	$ 37,484	$ 39,344

Schedule of Estimated Fair Valu

Schedule of Estimated Fair Values of Financial Instruments by Level of Valuation Inputs (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financial assets:
Investment securities held-to-maturity	$ 493,925	$ 513,273
Carrying Amount
Financial assets:
Cash and cash equivalents	807,952	782,023
Investment securities available-for-sale	1,657,591	1,611,698
Investment securities held-to-maturity	490,968	512,770
Accrued interest receivable	27,712	29,852
Mortgage servicing rights	19,454	18,457
Mortgages Held-for-sale, Fair Value Disclosure	23,237	61,794
Loans Receivable, Fair Value Disclosure	5,300,311	5,340,536
Derivative Asset	3,023	2,749
Deferred compensation asset at fair value amount	11,108	10,627
Total financial assets	8,341,356	8,370,506
Financial liabilities:
Total deposits, excluding time deposits	6,299,343	6,324,512
Time deposits	1,000,836	1,051,598
Securities sold under repurchase agreements	587,570	537,556
Other borrowed funds	1	6
Accrued interest payable	4,831	5,421
Long-term debt	27,994	27,970
Subordinated debentures held by subsidiary trusts	82,477	82,477
Derivative Liability	1,688	1,314
Deferred compensation plan liabilities at fair value amount	11,108	10,627
Total financial liabilities	8,015,848	8,041,481
Estimated Fair Value
Financial assets:
Cash and cash equivalents	807,952	782,023
Investment securities available-for-sale	1,657,591	1,611,698
Investment securities held-to-maturity	493,925	513,273
Accrued interest receivable	27,712	29,852
Mortgage servicing rights	36,151	35,656
Mortgages Held-for-sale, Fair Value Disclosure	23,237	61,794
Loans Receivable, Fair Value Disclosure	5,148,977	5,248,127
Derivative Asset	3,023	2,749
Deferred compensation asset at fair value amount	11,108	10,627
Total financial assets	8,209,676	8,295,799
Financial liabilities:
Total deposits, excluding time deposits	6,299,343	6,324,512
Time deposits	992,746	1,044,670
Securities sold under repurchase agreements	587,570	537,556
Other borrowed funds	1	6
Accrued interest payable	4,831	5,421
Long-term debt	27,520	27,477
Subordinated debentures held by subsidiary trusts	85,442	73,554
Derivative Liability	1,688	1,314
Deferred compensation plan liabilities at fair value amount	11,108	10,627
Total financial liabilities	8,010,249	8,025,137
Quoted Prices in Active Markets for Identical Assets (Level 1) | Estimated Fair Value
Financial assets:
Cash and cash equivalents	807,952	782,023
Investment securities available-for-sale	0	0
Investment securities held-to-maturity	0	0
Accrued interest receivable	0	0
Mortgage servicing rights	0	0
Mortgages Held-for-sale, Fair Value Disclosure	0	0
Loans Receivable, Fair Value Disclosure	0	0
Derivative Asset	0	0
Deferred compensation asset at fair value amount	0	0
Total financial assets	807,952	782,023
Financial liabilities:
Total deposits, excluding time deposits	6,299,343	6,324,512
Time deposits	0	0
Securities sold under repurchase agreements	0	0
Other borrowed funds	0	0
Accrued interest payable	0	0
Long-term debt	0	0
Subordinated debentures held by subsidiary trusts	0	0
Derivative Liability	0	0
Deferred compensation plan liabilities at fair value amount	0	0
Total financial liabilities	6,299,343	6,324,512
Significant Other Observable Inputs (Level 2) | Estimated Fair Value
Financial assets:
Cash and cash equivalents	0	0
Investment securities available-for-sale	1,657,591	1,611,698
Investment securities held-to-maturity	493,925	513,273
Accrued interest receivable	27,712	29,852
Mortgage servicing rights	36,151	35,656
Mortgages Held-for-sale, Fair Value Disclosure	23,237	61,794
Loans Receivable, Fair Value Disclosure	5,111,493	5,208,783
Derivative Asset	3,023	2,749
Deferred compensation asset at fair value amount	11,108	10,627
Total financial assets	7,364,240	7,474,432
Financial liabilities:
Total deposits, excluding time deposits	0	0
Time deposits	992,746	1,044,670
Securities sold under repurchase agreements	587,570	537,556
Other borrowed funds	1	6
Accrued interest payable	4,831	5,421
Long-term debt	27,520	27,477
Subordinated debentures held by subsidiary trusts	85,442	73,554
Derivative Liability	1,688	1,314
Deferred compensation plan liabilities at fair value amount	11,108	10,627
Total financial liabilities	1,710,906	1,700,625
Significant Unobservable Inputs (Level 3) | Estimated Fair Value
Financial assets:
Cash and cash equivalents	0	0
Investment securities available-for-sale	0	0
Investment securities held-to-maturity	0	0
Accrued interest receivable	0	0
Mortgage servicing rights	0	0
Mortgages Held-for-sale, Fair Value Disclosure	0
Loans Receivable, Fair Value Disclosure	37,484	39,344
Derivative Asset	0	0
Deferred compensation asset at fair value amount	0	0
Total financial assets	37,484	39,344
Financial liabilities:
Total deposits, excluding time deposits	0	0
Time deposits	0	0
Securities sold under repurchase agreements	0	0
Other borrowed funds	0	0
Accrued interest payable	0	0
Long-term debt	0	0
Subordinated debentures held by subsidiary trusts	0	0
Derivative Liability	0	0
Deferred compensation plan liabilities at fair value amount	0	0
Total financial liabilities	$ 0	$ 0

Subsequent Events (Details)

Subsequent Events (Details) - Class A Common Stock - Subsequent Event [Member] - $ / shares	May 12, 2017	May 02, 2017	Apr. 17, 2017
Subsequent Event [Line Items]
Dividends Payable, Date Declared			Apr. 17, 2017
Dividends Payable, Amount Per Share			$ 0.24
Dividends Payable, Date to be Paid	May 12, 2017
Dividends Payable, Date of Record		May 2, 2017