Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities
Net income	$ 25,986	$ 20,279
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan losses	7,496	7,379
Depreciation and amortization of premises and equipment	2,327	2,249
Net amortization on securities	1,081	1,267
Amortization of intangible assets	914	967
Excess tax (benefit) on stock-based compensation	(407)	(1,472)
Stock-based compensation expense	2,454	2,166
Bank owned life insurance income	(1,347)	(1,411)
Trading security purchases	0	(1,277)
Net unrealized losses in trading securities	0	491
Proceeds from sales of loans held for sale	23,977	24,896
Originations and purchases of loans held for sale	(24,188)	(27,622)
Net gains on sales of loans held for sale	(57)	(46)
Net security (gains)	(72)	0
Net (gain) loss on sales and write-down of other real estate owned	(174)	157
Impairment write-down of equity security	0	1,312
Net (increase) decrease in other assets	(7,272)	3,539
Net increase (decrease) in other liabilities	9,333	(5,145)
Net cash provided by operating activities	40,051	27,729
Securities available for sale:
Proceeds from maturities, calls and principal paydowns	51,122	78,038
Proceeds from sales	0	1,000
Purchases	(91,520)	(110,330)
Securities held to maturity:
Proceeds from maturities, calls and principal paydowns	18,242	19,914
Purchases	(21,333)	(5,943)
Equity securities:
Proceeds from sales	2,623	0
Other:
Net increase in loans	(69,659)	(82,299)
Proceeds from Federal Home Loan Bank stock redemption	71,081	56,521
Purchases of Federal Reserve and Federal Home Loan Bank stock	(68,153)	(52,065)
Purchases of premises and equipment, net	(1,186)	(1,269)
Proceeds from the sales of other real estate owned	534	2,430
Net cash (used in) investing activities	(108,249)	(94,003)
Financing activities
Net increase in deposits	223,292	211,363
Net (decrease) in short-term borrowings	(133,111)	(141,460)
Proceeds from issuance of long-term debt	25,000	0
Repayments of long-term debt	(25,045)	(64)
Proceeds from the issuance of shares to employee benefit plans and other stock plans	672	1,983
Cash paid by employer for tax-withholding on stock issuance	(1,729)	(2,813)
Cash dividends	(20,966)	(10,020)
Net cash provided by financing activities	68,113	58,989
Net (decrease) in cash and cash equivalents	(85)	(7,285)
Cash and cash equivalents at beginning of period	159,664	149,181
Cash and cash equivalents at end of period	159,579	141,896
Cash paid during the year for:
Interest expense	7,677	6,363
Income taxes paid, net of refund	3,199	1,019
Noncash investing activities:
Loans transferred to other real estate owned	$ 780	$ 3,946