Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities
Net income	$ 38,800	$ 37,447
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan losses	10,878	7,540
Depreciation and amortization of premises and equipment	4,511	4,277
Net accretion on securities	1,816	1,157
Amortization of intangible assets	2,024	2,471
Stock based compensation	2,286	2,676
Bank owned life insurance income	(2,562)	(2,487)
Purchases of trading securities	(270)	(649)
Losses (gains) on trading securities	56	(26)
Proceeds from sales of loans held for sale	44,598	24,743
Originations and purchases of loans held for sale	(47,298)	(26,051)
Net gains on sales of loans held for sale	(227)	(103)
Net security gains	(30)	(40)
Net gain on sales of other real estate owned	(528)	(1,079)
Net (increase) decrease in other assets	(6,890)	11,647
Net increase (decrease) in other liabilities	2,892	(6,152)
Net cash provided by operating activities	50,056	55,371
Securities available for sale:
Proceeds from maturities, calls, and principal paydowns	161,017	125,278
Purchases	(238,610)	(242,304)
Securities held to maturity:
Proceeds from maturities, calls, and principal paydowns	41,440	42,950
Purchases	(70,065)	(41,448)
Other:
Net increase in loans	(164,269)	(185,349)
Proceeds from FHLB stock redemption	64,194	19,085
Purchases of Federal Reserve and FHLB stock	(72,781)	(25,118)
Proceeds from settlement of bank owned life insurance	1,457	1,497
Purchase of bank owned life insurance	(45,000)	0
Purchases of premises and equipment	(2,083)	(2,671)
Proceeds from the sales of other real estate owned	4,583	2,597
Net cash used in investing activities	(320,117)	(305,483)
Financing activities
Net increase in deposits	135,573	71,874
Net increase in short-term borrowings	223,943	195,190
Repayments of long-term debt	(20,141)	(240)
Proceeds from the issuance of shares to employee benefit plans and other stock plans	(1,857)	492
Purchase of treasury stock	(17,193)	(10,672)
Cash dividends	(18,958)	(18,957)
Net cash provided by financing activities	301,367	237,687
Net increase (decrease) in cash and cash equivalents	31,306	(12,425)
Cash and cash equivalents at beginning of period	140,297	146,636
Cash and cash equivalents at end of period	171,603	134,211
Cash paid during the period for:
Interest	10,926	10,628
Income taxes paid	20,809	9,027
Noncash investing activities:
Loans transferred to other real estate owned	$ 1,608	$ 2,203