Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 98,286	$ 91,037
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	15,213	14,562
Stock-based compensation	6,512	5,582
Provision for credit losses	4,594	(2,096)
Net amortization of premiums and accretion of discounts on securities and borrowings	17,595	18,324
Amortization of other intangible assets	6,721	6,898
Gains on securities transactions, net	(2,481)	(102)
Proceeds from sales of loans held for sale	94,342	75,182
Gains on sales of loans, net	(3,034)	(1,497)
Originations of loans held for sale	(86,274)	(67,483)
Losses (gains) on sales of assets, net	77	(211)
FDIC loss-share receivable (excluding reimbursements)	3,380	11,610
Net change in:
Trading securities	14,233	78
Fair value of borrowings hedged by derivative transactions	3,270	0
Cash surrender value of bank owned life insurance	(5,188)	(4,593)
Accrued interest receivable	(199)	419
Other assets	(33,555)	57,493
Accrued expenses and other liabilities	12,490	(36,048)
Net cash provided by operating activities	145,982	169,155
Cash flows from investing activities:
Net loan originations	(486,862)	(495,941)
Loans purchased	(1,066,934)	(128,684)
Investment securities held to maturity:
Purchases	(201,681)	(358,393)
Sales	11,666	0
Maturities, calls and principal repayments	321,771	268,868
Investment securities available for sale:
Purchases	(38,819)	(20,830)
Sales	14,022	5,447
Maturities, calls and principal repayments	115,397	106,323
Proceeds from sales of real estate property and equipment	10,510	16,317
Purchases of real estate property and equipment	(23,139)	(18,106)
Reimbursements from the FDIC	2,835	4,967
Net cash used in investing activities	(1,341,234)	(620,032)
Cash flows from financing activities:
Net change in deposits	465,747	542,225
Net change in short-term borrowings	156,160	16,264
Proceeds from issuance of long-term borrowings, net	98,930	0
Repayments of long-term borrowings	(100,000)	0
Proceeds from issuance of preferred stock, net	111,590	0
Cash dividends paid to preferred shareholders	(2,017)	0
Cash dividends paid to common shareholders	(76,671)	(66,047)
Purchase of common shares to treasury	(2,108)	(946)
Common stock issued, net	4,993	3,667
Net cash provided by financing activities	656,624	495,163
Net change in cash and cash equivalents	(538,628)	44,286
Cash and cash equivalents at beginning of year	830,407	369,168
Cash and cash equivalents at end of period	291,779	413,454
Supplemental disclosures of cash flow information:
Interest on deposits and borrowings	121,907	120,086
Federal and state income taxes	49,932	28,669
Supplemental schedule of non-cash investing activities:
Transfer of loans to other real estate owned	8,711	9,053
Transfer of loans to loans held for sale	$ 0	$ 27,329