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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash Flows from Operating Activities      
Interest and dividends received $ 296,885 $ 279,210 $ 277,593
Service charges and other fees received 35,003 31,044 29,604
Interest paid (8,286) (7,987) (9,467)
Net cash paid to vendors, employees and others (113,241) (127,003) (132,499)
Income taxes (70,250) (51,495) (58,500)
Payments to FDIC, loss share agreement (519) (514) (1,089)
Net cash provided by operating activities 139,592 123,255 105,642
Cash Flows from Investing Activities      
Proceeds from redemption of FHLB stock 1,952 1,423 7,750
Net change in interest-earning balances from depository institutions 30,375 47,179 (5,573)
Proceeds from sale of investment securities held-for-sale 5,403 1,957 975
Proceeds from repayment of investment securities available-for-sale 425,666 448,823 395,430
Proceeds from maturity of investment securities available-for-sale 28,620 97,603 128,709
Purchases of investment securities available-for-sale (319,603) (461,674) (694,630)
Proceeds from repayment and maturity of investment securities held-to-maturity 118,540 281,141 51,025
Purchases of investment securities held-to-maturity (42,400) (346,334)  
Net increase in loan and lease finance receivables (111,879) (203,040) (189,707)
Proceeds from sale of loans 0 6,417 3,629
Proceeds from sale of asset held-for-sale 4,012 0 0
Proceeds from sales of premises and equipment 0 0 926
Purchase of premises and equipment (4,893) (12,615) (1,869)
Proceeds from sales of other real estate owned 0 2,102 2,587
Cash used in sale of branch, net (25,266) (8,217) 0
Cash acquired from acquisition, net of cash paid 28,325 (7,504) 0
Net cash provided by (used in) investing activities 138,852 (152,739) (300,748)
Cash Flows from Financing Activities      
Net (decrease) increase in other deposits (50,611) 541,210 378,321
Net decrease in time deposits (47,342) (363,486) (65,719)
Repayment of FHLB advances 0 (5,000) (200,000)
Net (decrease) increase in other borrowings (53,000) 7,000 0
Net (decrease) increase in customer repurchase agreements (49,255) (87,255) 127,077
Cash dividends on common stock (57,047) (51,625) (48,862)
Repurchase of common stock (1,128) (1,907) (834)
Proceeds from exercise of stock options 2,683 5,151 5,144
Tax benefit related to exercise of stock options 0 932 308
Net cash (used in) provided by financing activities (255,700) 45,020 195,435
Net increase in cash and cash equivalents 22,744 15,536 329
Cash and cash equivalents, beginning of period 121,633 106,097 105,768
Cash and cash equivalents, end of period 144,377 121,633 106,097
Reconciliation of Net Earnings to Net Cash Provided by Operating Activities      
Net earnings 104,411 101,429 99,145
Adjustments to reconcile net earnings to net cash provided by operating activities:      
Gain on sale of loans 0 (1,101) (732)
Gain on sale of branch (906) (272) 0
Gain on eminent domain condemnation (2,894) 0 0
(Gain) loss on sale of investment securities (402) (548) 22
Impairment loss on asset held-for-sale 0 2,558 0
Loss (gain) on sale of other real estate owned 0 27 (384)
Increase in bank owned life insurance (2,279) (3,829) (4,029)
Net amortization of premiums and discounts on investment securities 18,017 21,005 19,540
Accretion of PCI discount (1,769) (2,506) (4,032)
Recapture of provision for loan losses (8,500) (6,400) (5,600)
Recapture of provision for unfunded loan commitments (400) (450) (500)
Valuation adjustment on other real estate owned 0 337 162
Payments to FDIC, loss share agreement (519) (514) (1,089)
Stock-based compensation 2,953 2,803 2,733
Depreciation and amortization, net (645) 3,802 (1,474)
Change in other assets and liabilities 32,525 6,914 1,880
Total adjustments 35,181 21,826 6,497
Net cash provided by operating activities 139,592 123,255 105,642
Supplemental Disclosure of Non-cash Investing Activities      
Securities purchased and not settled 0 23,777 1,696
Transfer of loans to other real estate owned 0 0 3,721
Issuance of common stock for acquisition 37,637 21,642 0
Transfer of AFS securities to HTM securities $ 0 $ 0 $ 898,598