Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities
Net income	$ 41,638	$ 38,800
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan losses	14,946	10,878
Depreciation and amortization of premises and equipment	4,488	4,511
Net accretion on securities	2,430	1,816
Amortization of intangible assets	2,006	2,024
Excess tax benefit on stock-based compensation	1,526	0
Stock based compensation	2,638	2,286
Bank owned life insurance income	(2,629)	(2,562)
Trading securities purchases	(1,293)	(270)
Losses on trading securities	145	56
Proceeds from sales of loans held for sale	60,650	44,598
Originations and purchases of loans held for sale	(62,163)	(47,298)
Net gains on sales of loans held for sale	(223)	(227)
Net security (gains)	(2)	(30)
Net (gain) on sales of other real estate owned	(704)	(528)
Impairment write-down	1,312	0
Net (increase) in other assets	(3,261)	(6,890)
Net increase in other liabilities	4,405	2,892
Net cash provided by operating activities	65,909	50,056
Investing activities
Net cash used in acquisitions	(4,000)	0
Securities available for sale:
Proceeds from maturities, calls and principal paydowns	136,898	161,017
Purchases	(162,723)	(238,610)
Securities held to maturity:
Proceeds from maturities, calls and principal paydowns	52,883	41,440
Proceeds from sales	764	0
Purchases	(41,334)	(70,065)
Other:
Net increase in loans	(186,546)	(164,269)
Proceeds from Federal Home Loan Bank stock redemption	112,841	64,194
Purchases of Federal Reserve and Federal Home Loan Bank stock	(118,848)	(72,781)
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	(2,604)	(2,083)
Proceeds from the sales of other real estate owned	6,420	4,583
Net cash used in investing activities	(206,249)	(320,117)
Financing activities
Net increase in deposits	41,596	135,573
Net increase in short-term borrowings	149,482	223,943
Repayments of long-term debt	(15,129)	(20,141)
Proceeds from the issuance of shares to employee benefit plans and other stock plans	2,007	986
Cash paid by employer for tax-withholding on stock issuance	(2,823)	(2,843)
Purchase of treasury stock	0	(17,193)
Cash dividends	(20,044)	(18,958)
Net cash provided by financing activities	155,089	301,367
Net increase in cash and cash equivalents	14,749	31,306
Cash and cash equivalents at beginning of period	149,181	140,297
Cash and cash equivalents at end of period	163,930	171,603
Cash paid during the period for:
Interest	12,404	10,926
Income taxes paid	12,886	20,809
Noncash investing activities:
Loans transferred to other real estate owned	4,882	1,608
Acquisitions:
Fair value of assets acquired	$ 3,096	$ 0