Condensed Consolidated Statements of Cash Flows $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)
Cash flows from operating activities:
Net income	$ 12,391	$ 11,025
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	387	535
Provision for loan losses	1,385	760
Deferred income taxes	962	1,343
Net amortization of debt securities	1,310	721
Amortization of intangible assets	446	243
Mortgage loans originated for sale	(38,602)	(29,287)
Proceeds from mortgage loans sold	42,710	29,606
Gain on sale of other real estate	0	(122)
Gain on state tax credits, net	(246)	(518)
Excess tax benefit of share-based compensation	0	(783)
Share-based Compensation	866	794
Valuation adjustment on other real estate	18	1
Net accretion of loan discount and indemnification asset	(1,014)	(2,249)
Changes in:
Accrued interest receivable	1,682	(398)
Accrued interest payable	156	(87)
Other assets	(1,746)	(9,303)
Other liabilities	(51,693)	1,837
Net cash (used in) provided by operating activities	(30,988)	4,118
Cash flows from investing activities:
Proceeds from Previous Acquisition	6,171	0
Net increase in loans	(57,054)	(71,324)
Proceeds from the sale of securities, available for sale	143,554	0
Proceeds from the paydown or maturity of securities, available for sale	42,223	12,894
Proceeds from the paydown or maturity of securities, held to maturity	1,180	431
Proceeds from the redemption of other investments	12,033	17,653
Proceeds from the sale of state tax credits held for sale	4,093	3,412
Proceeds from the sale of other real estate	0	671
Payments for the purchase/origination of:
Available for sale debt and equity securities	(169,842)	(17,637)
Other investments	(20,318)	(19,430)
State tax credits held for sale	(1,298)	(2,349)
Fixed assets	(247)	(505)
Net cash used in investing activities	(39,505)	(76,184)
Cash flows from financing activities:
Net increase in noninterest-bearing deposit accounts	9,646	2,192
Net increase in interest-bearing deposit accounts	23,316	144,963
Proceeds from Federal Home Loan Bank advances	681,181	509,000
Repayments of Federal Home Loan Bank advances	(530,681)	(488,500)
Net decrease in other borrowings	(98,040)	(76,538)
Dividends, Common Stock, Cash	(2,579)	(1,802)
Excess tax benefit of share-based compensation	0	783
Payments for Repurchase of Common Stock	0	4,211
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	(2,151)	(1,745)
Net cash provided by financing activities	80,692	84,142
Net increase in cash and cash equivalents	10,199	12,076
Cash and cash equivalents, beginning of period	198,802	94,157
Cash and cash equivalents, end of period	209,001	106,233
Supplemental Cash Flow Information [Abstract]
Cash paid during the period for interest	4,289	3,119
Cash paid during the period for income taxes	28	14,084
Noncash transactions:
Transfer to other real estate owned in settlement of loans	0	2,683
Sales of other real estate financed	$ 0	$ 140
Common shares issued related to acquisition	141,729