Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income	$ 33,835	$ 31,310
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,972	4,949
Stock-based compensation	2,178	1,891
Provision for credit losses	3,998	1,769
Net amortization of premiums and accretion of discounts on securities and borrowings	6,715	5,737
Amortization of other intangible assets	2,351	1,603
Losses (gains) on securities transactions, net	8	(3,958)
Proceeds from sales of loans held for sale	32,771	453,881
Gains on sales of loans, net	(913)	(15,060)
Originations of loans held for sale	(26,984)	(453,643)
Losses on sales of assets, net	148	268
FDIC loss-share receivable (excluding reimbursements)	76	3,175
Net change in:
Trading securities	9	30
Fair value of borrowings carried at fair value	0	2,172
Cash surrender value of bank owned life insurance	(1,408)	(1,341)
Accrued interest receivable	(322)	(1,799)
Other assets	15,010	31,769
Accrued expenses and other liabilities	(37,242)	(22,415)
Net cash provided by operating activities	35,202	40,338
Cash flows from investing activities:
Net loan originations	(150,592)	204,703
Loans purchased	(19,084)	(10,526)
Investment securities held to maturity:
Purchases	(177,462)	(111,347)
Maturities, calls and principal repayments	93,818	142,206
Investment securities available for sale:
Purchases	(5,964)	(192,809)
Sales	0	3,368
Maturities, calls and principal repayments	50,081	45,184
Proceeds from sales of real estate property and equipment	5,977	984
Purchases of real estate property and equipment	(5,673)	(3,419)
Reimbursements from (payments to) the FDIC	1,424	(1,592)
Net cash (used in) provided by investing activities	(207,475)	76,752
Cash flows from financing activities:
Net change in deposits	(51,277)	38,573
Net change in short-term borrowings	255,655	(7,063)
Repayments of long-term borrowings	0	(1,000)
Dividends paid to common shareholders	(21,957)	(32,147)
Common stock issued, net	286	1,483
Net cash provided by (used in) financing activities	182,707	(154)
Net change in cash and cash equivalents	10,434	116,936
Cash and cash equivalents at beginning of year	369,168	853,100
Cash and cash equivalents at end of period	379,602	970,036
Supplemental disclosures of cash flow information:
Interest on deposits and borrowings	42,133	43,346
Federal and state income taxes	11,368	25
Supplemental schedule of non-cash investing activities:
Transfer of loans to other real estate owned	3,508	7,223
Transfer of loans to loans held for sale	$ 27,329	$ 0