Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating activities:
Net income	$ 44,811	$ 43,818	$ 26,108
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment, and amortization	6,474	5,906	5,735
Amortization of intangible assets	1,377	1,157	446
(Benefit from) provision for loan losses	(5,970)	(2,210)	(4,045)
Amortization of investment securities premium, net	4,926	3,458	970
Originations of loans for resale	(142,619)	(111,640)	(49,241)
Proceeds from sale of loans originated for resale	144,062	115,469	49,394
Gain on sale of loans	(4,037)	(3,064)	(2,032)
Change in market value of mortgage servicing rights	2,184	701	1,301
Provision for losses on foreclosed assets	140	502	208
Gain on sale of foreclosed assets	(262)	(991)	(2,153)
Provision for losses on fixed assets	782
Loss (gain) on disposal of fixed assets	147	129	(49)
Increase in cash value of life insurance	(2,717)	(2,786)	(1,953)
Gain on life insurance death benefit	(238)	(155)
Equity compensation vesting expense	1,467	1,370	1,133
Equity compensation tax effect	(155)	68	(225)
Deferred income tax expense (benefit)	3,190	681	(993)
Change in:
Reserve for unfunded commitments	244	330	(395)
Interest receivable	(1,241)	(1,511)	(619)
Interest payable	44	(204)	(67)
Other assets and liabilities, net	(4,383)	3,789	3,894
Net cash from operating activities	48,226	54,817	27,417
Investing activities:
Proceeds from maturities of securities available for sale	71,684	33,552	24,016
Proceeds from sale of securities available for sale		2	14,130
Purchases of securities available for sale	(247,717)	(341,303)
Proceeds from maturities of securities held to maturity	121,666	93,784	34,172
Purchases of securities held to maturity		(146,100)	(280,692)
(Purchase) redemption of restricted equity securities, net			(2,415)
Loan origination and principal collections, net	(251,479)	(244,018)	(82,079)
Loans purchased	(22,503)		(32,017)
Proceeds from sale of loans other than loans originated for resale	37,880
Proceeds from sale of premises and equipment	1,682	8	121
Improvement of foreclosed assets		(195)	(462)
Proceeds from sale of other real estate owned	4,010	5,449	9,762
Purchases of premises and equipment	(10,930)	(5,489)	(4,665)
Cash received from acquisition, net	156,316		141,405
Net cash used by investing activities	(139,391)	(604,310)	(178,724)
Financing activities:
Net increase in deposits	103,063	250,843	167,984
Net change in other borrowings	5,165	3,052	2,941
Equity compensation tax effect	155	(68)	225
Repurchase of common stock	(1,890)	(412)	(292)
Dividends paid	(13,695)	(11,849)	(7,807)
Exercise of stock options	518	660	616
Net cash from financing activities	93,316	242,226	163,667
Net change in cash and cash equivalents	2,151	(307,267)	12,360
Cash and cash equivalents and beginning of year	303,461	610,728	598,368
Cash and cash equivalents at end of year	305,612	303,461	610,728
Supplemental disclosure of noncash activities:
Unrealized loss on securities available for sale	(11,015)	(1,895)	(162)
Loans transferred to foreclosed assets	2,505	5,240	5,291
Due to broker		17,072
Market value of shares tendered in-lieu of cash to pay for exercise of options and/or related taxes	5,988	2,868	2,551
Supplemental disclosure of cash flow activity:
Cash paid for interest expense	5,677	5,620	4,641
Cash paid for income taxes	27,575	$ 24,315	22,685
Assets acquired in acquisition	161,231		978,682
Liabilities assumed in acquisition	$ 161,231		$ 827,372