Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 46,095	$ 36,187
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,260	6,417
Stock-based compensation	4,127	2,369
Provision for credit losses	2,470	800
Net amortization of premiums and accretion of discounts on securities and borrowings	6,043	4,198
Amortization of other intangible assets	2,536	2,849
Losses (gains) on securities transactions, net	23	(271)
Proceeds from sales of loans held for sale	161,325	54,907
Gains on sales of loans, net	(4,128)	(1,795)
Originations of loans held for sale	(112,682)	(52,749)
Losses on sales of assets, net	34	10
FDIC loss-share receivable (excluding reimbursements)	229	560
Net change in:
Fair value of borrowings hedged by derivative transactions	(454)	4,719
Cash surrender value of bank owned life insurance	(2,463)	(1,963)
Accrued interest receivable	(1,429)	581
Other assets	(6,924)	(6,079)
Accrued expenses and other liabilities	(35,145)	3,993
Net cash provided by operating activities	65,917	54,733
Cash flows from investing activities:
Net loan originations and purchases	(323,470)	(95,035)
Investment securities held to maturity:
Purchases	(52,160)	(83,955)
Maturities, calls and principal repayments	77,141	58,907
Investment securities available for sale:
Purchases	(207,402)	(302,321)
Sales	0	2,081
Maturities, calls and principal repayments	50,543	366,882
Death benefit proceeds from bank owned life insurance	1,998	0
Proceeds from sales of real estate property and equipment	4,970	3,919
Purchases of real estate property and equipment	(5,627)	(7,578)
(Payments to) reimbursements from the FDIC	(408)	370
Net cash used in investing activities	(454,415)	(56,730)
Cash flows from financing activities:
Net change in deposits	(399,567)	154,875
Net change in short-term borrowings	564,004	93,632
Proceeds from issuance of long-term borrowings, net	200,000	0
Repayments of long-term borrowings	0	(155,000)
Cash dividends paid to preferred shareholders	(1,797)	(1,797)
Cash dividends paid to common shareholders	(29,012)	(27,916)
Purchase of common shares to treasury	(2,151)	(1,496)
Common stock issued, net	1,246	2,392
Net cash provided by financing activities	332,723	64,690
Net change in cash and cash equivalents	(55,775)	62,693
Cash and cash equivalents at beginning of year	392,501	413,800
Cash and cash equivalents at end of period	336,726	476,493
Cash payments for:
Interest on deposits and borrowings	56,735	38,766
Federal and state income taxes	1,599	67
Supplemental schedule of non-cash investing activities:
Transfer of loans to other real estate owned	4,813	663
Transfer of loans to loans held for sale	$ 103,884	$ 0