Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities
Net income	$ 18,891	$ 18,166
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan losses	6,098	3,642
Depreciation and amortization of premises and equipment	2,244	2,152
Net accretion on securities	799	531
Amortization of intangible assets	1,096	1,284
Stock based compensation	1,612	1,988
Bank owned life insurance income	(1,291)	(1,559)
Purchases of trading securities	(568)	(492)
Losses on trading securities	40	20
Proceeds from sales of loans held for sale	22,098	7,111
Originations and purchases of loans held for sale	(22,133)	(7,297)
Net gains on sales of loans held for sale	(49)	(64)
Net security gains	(29)	(14)
Net gain on sales of other real estate owned	(306)	0
Net decrease in other assets	2,135	12,078
Net decrease in other liabilities	(1,319)	(7,547)
Net cash provided by operating activities	29,318	29,999
Securities available for sale:
Proceeds from maturities, calls, and principal paydowns	74,090	61,153
Purchases	(142,613)	(114,445)
Securities held to maturity:
Proceeds from maturities, calls, and principal paydowns	15,591	19,752
Purchases	(9,471)	(18,907)
Other:
Net increase in loans	(90,342)	(33,206)
Proceeds from FHLB stock redemption	33,886	13,481
Purchases of Federal Reserve and FHLB stock	(29,475)	(8,617)
Proceeds from settlement of bank owned life insurance	1,457	1,468
Purchases of bank owned life insurance	(45,000)	0
Purchases of premises and equipment	(1,625)	(1,044)
Proceeds from the sales of other real estate owned	3,208	698
Net cash used in investing activities	(190,294)	(79,667)
Financing activities
Net increase in deposits	300,199	179,832
Net decrease in short-term borrowings	(94,613)	(123,630)
Repayments of long-term debt	(70)	(170)
Proceeds from the issuance of shares to employee benefit plans and other stock plans	(2,661)	(1,055)
Purchase of treasury stock	(17,193)	0
Cash dividends and payment for fractional shares	(9,473)	(9,282)
Net cash provided by financing activities	176,189	45,695
Net increase (decrease) in cash and cash equivalents	15,213	(3,973)
Cash and cash equivalents at beginning of period	140,297	146,636
Cash and cash equivalents at end of period	155,510	142,663
Cash paid during the period for:
Interest	5,876	5,803
Income taxes paid	3,405	872
Noncash investing activities:
Loans transferred to other real estate owned	$ 952	$ 1,062