Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Operating activities:
Net income	$ 10,791	$ 9,835
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	900	500	$ 3,000
Depreciation, amortization and accretion, net	2,280	2,662
Deferred income tax provision	25	1,179
Gain on sales of mortgage loans held for sale	(406)	(462)
Origination of mortgage loans held for sale	(20,839)	(20,788)
Proceeds from sale of mortgage loans held for sale	20,574	24,066
Bank owned life insurance income	(204)	(221)
Loss (gain) on the sale of other real estate		(333)
Stock compensation expense	660	513
Excess tax benefits from share-based compensation arrangements	(1,013)	(404)
Increase in accrued interest receivable and other assets	(1,125)	(4,774)
Increase in accrued interest payable and other liabilities	3,947	5,871
Net cash provided by operating activities	15,590	17,644
Investing activities:
Purchases of securities available for sale	(99,988)	(117,915)
Proceeds from sale of securities available for sale
Proceeds from maturities of securities available for sale	114,297	119,615
Net (increase) decrease in loans	32,171	(62,660)
Purchases of premises and equipment	(308)	(1,169)
Proceeds from sale of foreclosed assets	1,043	513
Net cash provided by (used in) investing activities	47,215	(61,616)
Financing activities:
Net increase(decrease) in deposits	23,707	(5,602)
Net decrease in securities sold under agreements to repurchase and federal funds purchased	(38,293)	(2,139)
Proceeds from Federal Home Loan Bank advances	30,000	30,000
Repayments of Federal Home Loan Bank advances	(30,320)	(30,232)
Proceeds (used for) and received from settlement of stock awards	(216)	495
Excess tax benefits from share-based compensation arrangements		404
Common stock repurchases	(1,889)	(1,020)
Cash dividends paid	(4,286)	(3,729)
Net cash used in financing activities	(21,297)	(11,823)
Net increase (decrease) in cash and cash equivalents	41,508	(55,795)
Cash and cash equivalents at beginning of period	47,973	103,833	103,833
Cash and cash equivalents at end of period	89,481	48,038	$ 47,973
Supplemental cash flow information:
Income tax payments
Cash paid for interest	1,437	1,239
Supplemental non-cash activity:
Transfers from loans to other real estate owned		$ 146