Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating activities:
Net income	$ 37,565	$ 32,278
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment, and amortization	5,089	4,870
Amortization of intangible assets	1,050	1,017
Benefit from reversal of provision for loan losses	(1,588)	(4,537)
Amortization of investment securities premium, net	2,431	3,625
Gain on sale of investment securities	(961)
Originations of residential mortgage loans for resale	(83,907)	(101,206)
Proceeds from sale of residential mortgage loans originated for resale	85,846	97,056
Gain on sale of loans	(2,293)	(2,645)
Change in market value of mortgage servicing rights	795	2,198
Provision for losses on foreclosed assets	162	40
Gain on sale of foreclosed assets	(308)	(218)
Write down of fixed assets held for sale		716
Loss on disposal of fixed assets	61	52
Gain on sale of premises held for sale	(3)
Increase in cash value of life insurance	(2,043)	(2,086)
Life insurance proceeds in excess of cash value	(108)	(238)
Equity compensation vesting expense	1,184	1,078
Tax effect of equity compensation exercise or release		182
Change in:
Reserve for unfunded commitments	270	433
Interest receivable	(629)	(33)
Interest payable	49
Other assets and liabilities, net	3,155	6,302
Net cash from operating activities	45,817	38,884
Investing activities:
Proceeds from maturities of securities available for sale	46,646	47,722
Proceeds from maturities of securities held to maturity	64,969	83,665
Purchases of securities available for sale	(195,465)	(160,787)
Loan origination and principal collections, net	(174,914)	(198,366)
Loans purchased		(22,503)
Proceeds from sale of loans other than loans originated for sale		32,029
Proceeds from sale of other real estate owned	1,787	3,375
Proceeds from sale of premises and equipment		1,231
Proceeds from the sale of premises held for sale	3,338
Purchases of premises and equipment	(10,874)	(10,048)
Life insurance proceeds	649
Cash acquired in acquisition		156,316
Net cash used by investing activities	(263,864)	(67,366)
Financing activities:
Net increase in deposits	31,896	43,515
Net change in other borrowings	81,237	6,907
Tax effect of equity compensation exercise or release		(182)
Repurchase of common stock	(1,629)	(384)
Dividends paid	(11,228)	(10,265)
Exercise of stock options	193	518
Net cash provided by financing activities	100,469	40,109
Net change in cash and cash equivalents	(117,578)	11,627
Cash and cash equivalents and beginning of year	305,612	303,461
Cash and cash equivalents at end of period	188,034	315,088
Supplemental disclosure of noncash activities:
Unrealized gain (loss) on securities available for sale	5,411	11,240
Loans transferred to foreclosed assets	726	1,953
Fixed assets transferred to held for sale		1,934
Due from broker	25,757
Market value of shares tendered in-lieu of cash to pay for exercise of options, release of RSUs, and/or related taxes	3,854	2,774
Supplemental disclosure of cash flow activity:
Cash paid for interest expense	4,881	4,261
Cash paid for income taxes	$ 15,450	15,515
Assets acquired in acquisition		161,231
Liabilities assumed in acquisition		$ 161,231