Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	$ (1,811)	$ (1,080)
Dividends, Common Stock, Cash	(3,804)	(2,252)
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	824	153
Payments for Repurchase of Common Stock	4,711	0
Cash flows from operating activities:
Net income	23,377	18,062
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	1,070	1,009
Provision for loan losses	1,140	460
Deferred income taxes	3,509	2,803
Net amortization of debt securities	1,513	1,661
Amortization of intangible assets	486	569
Gain on sale of investment securities	0	(23)
Mortgage loans originated for sale	(70,018)	(69,434)
Proceeds from mortgage loans sold	67,278	68,252
Gain on sale of other real estate	(828)	(29)
Gain on state tax credits, net	(671)	(748)
Excess tax benefit of share-based compensation	(824)	(153)
Share-based Compensation	1,626	1,738
Valuation adjustment on other real estate	1	82
Net accretion of loan discount and indemnification asset	(5,692)	(3,382)
Changes in:
Accrued interest receivable	276	36
Accrued interest payable	(4)	(23)
Other assets	(5,284)	(2,601)
Other liabilities	(9,295)	196
Net cash provided by (used in) operating activities	7,660	18,475
Cash flows from investing activities:
Net decrease (increase) in loans	(112,500)	(99,282)
Net cash proceeds received from FDIC loss share receivable	0	1,574
Proceeds from the sale of securities, available for sale	0	41,069
Proceeds from the paydown or maturity of securities, available for sale	29,398	25,813
Proceeds from the paydown or maturity of securities, held to maturity	1,145	1,078
Proceeds from the redemption of other investments	34,314	25,746
Proceeds from the sale of state tax credits held for sale	3,952	4,489
Proceeds from the sale of other real estate	6,355	3,723
Payments for the purchase/origination of:
Available for sale debt and equity securities	(49,012)	(74,069)
Other investments	(34,263)	(19,641)
State tax credits held for sale	(2,349)	(3,425)
Fixed assets	(740)	(983)
Net cash provided by (used in) investing activities	(123,700)	(93,908)
Cash flows from financing activities:
Net increase in noninterest-bearing deposit accounts	35,713	15,328
Net increase in interest-bearing deposit accounts	207,932	184,721
Proceeds from Federal Home Loan Bank advances	981,000	531,900
Repayments of Federal Home Loan Bank advances	(1,013,000)	(602,900)
Repayments of notes payable	0	(600)
Net decrease in other borrowings	(69,964)	(50,737)
Net cash provided by (used in) financing activities	132,179	74,533
Net increase (decrease) in cash and cash equivalents	16,139	(900)
Cash and cash equivalents, beginning of period	94,157	100,696
Cash and cash equivalents, end of period	110,296	99,796
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	6,286	6,201
Cash paid during the period for income taxes	19,124	6,517
Noncash transactions:
Transfer to other real estate owned in settlement of loans	2,683	5,998
Sales of other real estate financed	140	0
Retained Earnings [Member]
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	0	0
Dividends, Common Stock, Cash		2,252
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	0	0
Cash flows from operating activities:
Net income	23,377	18,062
Adjustments to reconcile net income to net cash provided by operating activities
Share-based Compensation	0	0
Parent [Member]
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures		1,080
Dividends, Common Stock, Cash	3,804	2,252
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	(824)	(153)
Cash flows from operating activities:
Net income	23,377	18,062
Adjustments to reconcile net income to net cash provided by operating activities
Share-based Compensation	1,626	1,738
Additional Paid-in Capital [Member]
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	1,812	1,081
Dividends, Common Stock, Cash	0	0
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net		(153)
Cash flows from operating activities:
Net income	$ 0	0
Adjustments to reconcile net income to net cash provided by operating activities
Share-based Compensation		$ 1,738