Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating activities
Net income	$ 20,279	$ 18,891
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan losses	7,379	6,098
Depreciation and amortization of premises and equipment	2,249	2,244
Net accretion on securities	1,267	799
Amortization of intangible assets	967	1,096
Excess tax benefit on stock-based compensation	1,472	0
Stock based compensation	2,166	1,612
Bank owned life insurance income	(1,411)	(1,291)
Trading securities purchases	(1,277)	(568)
Losses on trading securities	491	40
Proceeds from sales of loans held for sale	24,896	22,098
Originations and purchases of loans held for sale	(27,622)	(22,133)
Net gains on sales of loans held for sale	(46)	(49)
Net security (gains)	0	(29)
Net loss (gain) on sales of other real estate owned	157	(306)
Impairment write-down	1,312	0
Net decrease in other assets	595	2,135
Net (decrease) in other liabilities	(5,145)	(1,319)
Net cash provided by operating activities	27,729	29,318
Securities available for sale:
Proceeds from maturities, calls, and principal paydowns	78,038	74,090
Proceeds from sales	1,000	0
Purchases	(110,330)	(142,613)
Securities held to maturity:
Proceeds from maturities, calls, and principal paydowns	19,914	15,591
Purchases	(5,943)	(9,471)
Other:
Net increase in loans	(82,299)	(90,342)
Proceeds from Federal Home Loan Bank stock redemption	56,521	33,886
Purchases of Federal Reserve and Federal Home Loan Bank stock	(52,065)	(29,475)
Proceeds from settlement of bank owned life insurance	0	1,457
Purchase of bank owned life insurance	0	(45,000)
Purchases of premises and equipment, net	(1,269)	(1,625)
Proceeds from the sales of other real estate owned	2,430	3,208
Net cash used in investing activities	(94,003)	(190,294)
Financing activities
Net increase in deposits	211,363	300,199
Net decrease in short-term borrowings	(141,460)	(94,613)
Repayments of long-term debt	(64)	(70)
Proceeds from the issuance of shares to employee benefit plans and other stock plans	1,983	(7)
Cash paid by employer for tax-withholding on stock issuance	(2,813)	(2,654)
Purchase of treasury stock	0	(17,193)
Cash dividends	(10,020)	(9,473)
Net cash provided by financing activities	58,989	176,189
Net increase (decrease) in cash and cash equivalents	(7,285)	15,213
Cash and cash equivalents at beginning of period	149,181	140,297
Cash and cash equivalents at end of period	141,896	155,510
Cash paid during the period for:
Interest	6,363	5,876
Income taxes paid	1,019	3,405
Noncash investing activities:
Loans transferred to other real estate owned	$ 3,946	$ 952