Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net income	$ 63,355	$ 65,232
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,016	9,886
Stock-based compensation	3,845	3,327
Provision for credit losses	(1,673)	4,321
Net amortization of premiums and accretion of discounts on securities and borrowings	13,757	13,332
Amortization of other intangible assets	4,697	3,530
Losses (gains) on securities transactions, net	1	(3,999)
Proceeds from sales of loans held for sale	56,579	935,834
Gains on sales of loans, net	(1,592)	(29,426)
Originations of loans held for sale	(53,568)	(846,488)
Gains on sales of assets, net	(128)	(410)
FDIC loss-share receivable (excluding reimbursements)	7,787	5,175
Net change in:
Trading securities	43	7,987
Fair value of borrowings carried at fair value	0	2,406
Cash surrender value of bank owned life insurance	(3,022)	(2,765)
Accrued interest receivable	314	(928)
Other assets	37,596	38,758
Accrued expenses and other liabilities	(32,852)	(27,077)
Net cash provided by operating activities	105,155	178,695
Cash flows from investing activities:
Net loan (originations) repayments	(243,102)	287,940
Loans purchased	(26,746)	(178,486)
Investment securities held to maturity:
Purchases	(279,718)	(436,005)
Maturities, calls and principal repayments	185,690	282,888
Investment securities available for sale:
Purchases	(9,180)	(283,736)
Sales	0	4,309
Maturities, calls and principal repayments	77,396	104,679
Death benefit proceeds from bank owned life insurance	0	628
Proceeds from sales of real estate property and equipment	10,172	6,574
Purchases of real estate property and equipment	(13,518)	(6,828)
Reimbursements from (payments to) the FDIC	4,283	(865)
Net cash used in investing activities	(294,723)	(218,902)
Cash flows from financing activities:
Net change in deposits	96,790	(21,396)
Net change in short-term borrowings	72,775	(29,263)
Repayments of long-term borrowings	0	(1,000)
Cash dividends paid to common shareholders	(43,995)	(64,492)
Common stock issued, net	1,511	3,583
Net cash provided by (used in) financing activities	127,081	(112,568)
Net change in cash and cash equivalents	(62,487)	(152,775)
Cash and cash equivalents at beginning of year	369,168	853,100
Cash and cash equivalents at end of period	306,681	700,325
Supplemental disclosures of cash flow information:
Interest on deposits and borrowings	78,549	84,640
Federal and state income taxes	20,102	6,614
Supplemental schedule of non-cash investing activities:
Transfer of loans to other real estate owned	6,340	13,384
Transfer of loans to loans held for sale	$ 27,329	$ 0