Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 35,209	$ 27,771
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	1,628	1,510
Provision for loan losses	2,984	832
Deferred income taxes	3,881	1,937
Net amortization of debt securities	2,350	2,473
Amortization of intangible assets	718	842
Gain on sale of investment securities	(86)	(23)
Mortgage loans originated for sale	(117,975)	(95,744)
Proceeds from mortgage loans sold	117,639	95,814
Gain on sale of other real estate	(602)	(61)
Gain on state tax credits, net	(899)	(1,069)
Excess tax benefit of share-based compensation	(744)	(156)
Share-based Compensation	2,410	2,588
Valuation adjustment on other real estate	1	82
Net accretion of loan discount and indemnification asset	(8,165)	(4,894)
Changes in:
Accrued interest receivable	(127)	(703)
Accrued interest payable	19	(63)
Other assets	(2,101)	4,851
Other liabilities	(8,057)	4,024
Net cash provided by (used in) operating activities	28,083	40,011
Cash flows from investing activities:
Net decrease (increase) in loans	(256,706)	(152,970)
Net cash proceeds received from FDIC loss share receivable	0	1,725
Proceeds from the sale of securities, available for sale	2,493	41,069
Proceeds from the paydown or maturity of securities, available for sale	46,017	40,230
Proceeds from the paydown or maturity of securities, held to maturity	2,592	1,848
Proceeds from the redemption of other investments	44,968	29,362
Proceeds from the sale of state tax credits held for sale	4,918	5,353
Proceeds from the sale of other real estate	8,072	5,662
Payments for the purchase/origination of:
Available for sale debt and equity securities	(71,309)	(150,934)
Other investments	(48,283)	(23,931)
State tax credits held for sale	(2,349)	(14,004)
Fixed assets	(1,284)	(1,152)
Net cash provided by (used in) investing activities	(270,871)	(217,742)
Cash flows from financing activities:
Net increase in noninterest-bearing deposit accounts	44,695	48,828
Net increase in interest-bearing deposit accounts	295,539	273,625
Proceeds from Federal Home Loan Bank advances	1,309,000	635,900
Repayments of Federal Home Loan Bank advances	(1,290,000)	(704,900)
Repayments of notes payable	0	(900)
Net decrease in other borrowings	(80,304)	(44,299)
Dividends, Common Stock, Cash	(6,005)	(3,654)
Excess tax benefit of share-based compensation	744	156
Payments for Repurchase of Common Stock	4,889	0
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	1,650	831
Net cash provided by (used in) financing activities	267,130	203,925
Net increase (decrease) in cash and cash equivalents	24,342	26,194
Cash and cash equivalents, beginning of period	94,157	100,696
Cash and cash equivalents, end of period	118,499	126,890
Supplemental Cash Flow Information [Abstract]
Cash paid during the period for interest	9,726	9,415
Cash paid during the period for income taxes	19,868	8,763
Noncash transactions:
Transfer to other real estate owned in settlement of loans	2,683	6,604
Sales of other real estate financed	$ 140	$ 0