Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating activities
Net income	$ 37,447	$ 45,649
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan losses	7,540	7,762
Depreciation and amortization of premises and equipment	4,277	4,105
Net accretion on securities	1,157	1,883
Amortization of intangible assets	2,471	2,546
Stock based compensation	2,676	2,082
Bank owned life insurance income	(2,487)	(2,360)
Purchases of trading securities	(649)	(1,485)
Gains on trading securities	(26)	(91)
Proceeds from sales of loans held for sale	24,743	1,922
Originations and purchases of loans held for sale	(26,051)	(3,701)
Net gains on sales of loans held for sale	(103)	(3)
Net security gains	(40)	(21)
Net gain on sales of other real estate owned	(1,079)	(212)
Gain on sale of equity investment	0	(19,401)
Prepayment penalties on long-term debt	0	4,554
Net decrease in other assets	11,647	7,607
Net decrease in other liabilities	(6,152)	(8,421)
Net cash provided by operating activities	55,371	42,415
Securities available for sale:
Proceeds from maturities, calls, and principal paydowns	125,278	119,680
Purchases	(242,304)	(116,594)
Securities held to maturity:
Proceeds from maturities, calls, and principal paydowns	42,950	14,835
Purchases	(41,448)	(17,363)
Other:
Net increase in loans	(185,349)	(174,358)
Proceeds from FHLB stock redemption	19,085	37,179
Purchases of Federal Reserve and FHLB stock	(25,118)	(39,408)
Proceeds from settlement of bank owned life insurance	1,497	1,319
Purchases of premises and equipment	(2,671)	(3,498)
Proceeds from sale of equity investment	0	19,639
Proceeds from the sales of other real estate owned	2,597	1,919
Net cash used in investing activities	(305,483)	(156,650)
Financing activities
Net increase in deposits	71,874	152,364
Net increase in short-term borrowings	195,190	78,436
Proceeds from issuance of long-term debt	0	120,000
Repayments of long-term debt	(240)	(194,785)
Proceeds from the issuance of shares to employee benefit plans and other stock plans	492	1,128
Purchase of treasury stock	(10,672)	(72)
Cash dividends	(18,957)	(18,425)
Net cash provided by financing activities	237,687	138,646
Net (decrease) increase in cash and cash equivalents	(12,425)	24,411
Cash and cash equivalents at beginning of period	146,636	158,926
Cash and cash equivalents at end of period	134,211	183,337
Cash paid during the period for:
Interest	10,628	13,405
Income taxes paid	9,027	19,496
Noncash investing activities:
Loans transferred to other real estate owned	$ 2,203	$ 785