Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash Flows from Operating Activities
Interest and dividends received	$ 138,664	$ 137,747
Service charges and other fees received	16,908	13,840
Interest paid	(4,030)	(5,768)
Net cash paid to vendors, employees and others	(69,730)	(68,710)
Income taxes paid	(23,000)	(27,000)
Payments to FDIC, loss share agreement	(203)	(460)
Net cash provided by operating activities	58,609	49,649
Cash Flows from Investing Activities
Proceeds from redemption of FHLB stock	1,423	7,750
Net change in interest-earning balances from depository institutions	3,755	2,740
Proceeds from repayment of investment securities available-for-sale	228,070	202,162
Proceeds from maturity of investment securities available-for-sale	56,006	54,601
Purchases of investment securities available-for-sale	(97,368)	(236,451)
Proceeds from repayment and maturity of investment securities held-to-maturity	128,497
Net (increase) decrease in loan and lease finance receivables	(54,623)	35,862
Proceeds from sale of loans	6,417
Purchase of premises and equipment	(2,045)	(485)
Proceeds from sales of other real estate owned	621	1,538
Cash used in sale of branch, net	(8,217)
Cash paid for County Commerce Bank (CCB) acquisition, net of cash acquired	(7,504)
Net cash provided by investing activities	255,032	67,717
Cash Flows from Financing Activities
Net increase in other deposits	512,784	430,912
Net decrease in time deposits	(58,754)	(41,690)
Repayment of FHLB advances	(5,000)	(200,000)
Net decrease in other borrowings	(46,000)	(46,000)
Net (decrease) increase in customer repurchase agreements	(99,818)	98,699
Cash dividends on common stock	(25,700)	(23,340)
Repurchase of common stock	(408)	(511)
Proceeds from exercise of stock options	2,254	4,500
Tax benefit related to exercise of stock options	86	742
Net cash provided by financing activities	279,444	223,312
Net increase in cash and cash equivalents	593,085	340,678
Cash and cash equivalents, beginning of period	106,097	105,768
Cash and cash equivalents, end of period	699,182	446,446
Reconciliation of Net Earnings to Net Cash Provided by Operating Activities
Net earnings	48,905	42,646
Adjustments to reconcile net earnings to net cash provided by operating activities:
Gain on sale of loans	1,101	0
Gain on sale of branch	(272)
Gain on sale of other real estate owned	(14)	(232)
Increase in bank owned life insurance	(2,275)	(2,670)
Net amortization of premiums and discounts on investment securities	10,192	9,749
Accretion of PCI discount	(1,569)	(2,012)
Recapture of provision for loan losses	0	(2,000)
Recapture of provision for unfunded loan commitments	0	(500)
Valuation adjustment on other real estate owned	337	162
Payments to FDIC, loss share agreement	(203)	(460)
Stock-based compensation	1,307	1,371
Depreciation and amortization, net	1,685	292
Change in other assets and liabilities	1,617	3,303
Total adjustments	9,704	7,003
Net cash provided by operating activities	58,609	49,649
Supplemental Disclosure of Non-cash Investing Activities
Securities purchased and not settled	44,723	59,693
Transfer of loans to other real estate owned		$ 3,666
Issuance of common stock for CCB acquisition	$ 21,642