Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 38,450	$ 27,173	$ 33,104
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	2,022	2,238	2,783
Provision for loan losses	458	5,492	4,332
Deferred income taxes	5,763	(4,277)	9,943
Net amortization of debt securities	3,256	3,810	5,593
Amortization of intangible assets	1,089	1,254	1,905
Gain on sale of investment securities	(23)	0	(1,295)
Mortgage loans originated for sale	(135,721)	(74,135)	(78,335)
Proceeds from mortgage loans sold	133,552	72,529	88,845
Gain on sale of other real estate	(142)	(1,531)	(3,363)
Gain on state tax credits, net	(2,720)	(2,252)	(2,503)
Excess tax benefit of share-based compensation	(449)	(205)	(222)
Share-based compensation	3,601	2,950	5,048
Valuation adjustment on other real estate	82	696	1,443
Net accretion of loan discount and indemnification asset	(7,805)	(9,879)	(16,435)
Gain on sale of branches	0	0	(1,044)
Changes in:
Accrued interest receivable	(443)	(653)	1,179
Accrued interest payable	(214)	(114)	(303)
Prepaid FDIC insurance	0	0	2,607
Other assets	10,375	(205)	(12,002)
Other liabilities	7,582	49	7,914
Net cash provided by operating activities	47,187	31,494	29,308
Cash flows from investing activities:
Net cash paid for acquisitions and dispositions	0	0	(67,564)
Net decrease (increase) in loans	(290,326)	(240,640)	36,169
Net cash proceeds received from FDIC loss share receivable	2,275	9,605	10,981
Proceeds from the termination of FDIC loss share agreements	1,253	0	0
Proceeds from the sale of debt securities, available for sale	41,069	0	159,604
Proceeds from the paydown or maturity of debt securities, available for sale	53,733	47,678	82,641
Proceeds from the paydown or maturity of debt securities, held to maturity	2,284	455	0
Proceeds from the redemption of other investments	39,929	29,045	30,632
Proceeds from the sale of state tax credits held for sale	16,337	12,814	16,723
Proceeds from the sale of other real estate	7,378	17,259	19,558
Payments for the purchase of:
Available for sale debt and equity securities	(152,044)	(53,664)	(60,732)
Other investments	(36,046)	(33,477)	(29,225)
Bank owned life insurance	0	0	(20,000)
State tax credits held for sale	(20,981)	0	(1,365)
Fixed assets	(2,111)	(1,901)	(1,338)
Net cash provided by (used in) investing activities	(337,250)	(212,826)	176,084
Cash flows from financing activities:
Net increase (decrease) in noninterest-bearing deposit accounts	74,530	(10,756)	(19,719)
Net increase (decrease) in interest-bearing deposit accounts	218,551	(32,686)	(32,876)
Proceeds from Federal Home Loan Bank advances	945,900	1,227,500	765,000
Repayments of Federal Home Loan Bank advances	(979,900)	(1,133,500)	(795,000)
Repayments of notes payable	(5,700)	(4,800)	(1,200)
Repayments of subordinated debentures	0	0	(2,500)
Net increase (decrease) increase in other borrowings	36,143	30,352	(22,433)
Cash dividends paid on common stock	(5,259)	(4,177)	(3,946)
Excess tax benefit of share-based compensation	449	205	222
Payments for the repurchase of common stock warrants	0	0	(1,006)
Issuance of common stock	2	2	1
Proceeds from the issuance of equity instruments, net	(1,192)	(681)	2,264
Net cash provided (used) by financing activities	283,524	71,459	(111,193)
Net increase (decrease) in cash and cash equivalents	(6,539)	(109,873)	94,199
Cash and cash equivalents, beginning of period	100,696	210,569	116,370
Cash and cash equivalents, end of period	94,157	100,696	210,569
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	12,583	14,500	18,462
Cash paid during the period for income taxes	15,763	8,993	27,133
Noncash transactions:
Transfer to other real estate owned in settlement of loans	8,248	9,869	22,623
Sales of other real estate financed	0	8,083	9,244
Issuance of common stock from Trust Preferred Securities conversion	0	5,002	20,443
Transfer of securities from available for sale to held to maturity	$ 0	$ 46,574	$ 0