Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 263,455	$ 348,150	$ 322,690
Debt extinguishment cost	120,192	0	0
Adjustments to reconcile net income to net cash provided by operating activities:
Net impairment losses on investment securities, goodwill, and long-lived assets	165,134	106,545	35,686
Provision for credit losses	(104,240)	18,614	65,246
Depreciation and amortization	130,616	185,185	240,485
Deferred income tax expense (benefit)	(60,117)	9,788	115,604
Net write-down of and gains or losses from sales of other real estate owned	(3,681)	17,166	58,676
Net increase (decrease) in trading securities	(6,286)	11,983	8,394
Net decrease in loans held for sale	116,624	(31,445)	50,696
Change in other liabilities	(2,051)	27,439	19,370
Change in other assets	255,564	71,772	153,592
Other, net	1,356	(29,002)	(1,691)
Net cash provided by operating activities	876,566	736,195	1,068,748
CASH FLOWS FROM INVESTING ACTIVITIES
Net increase in money market investments	297,036	(1,631,278)	(2,416,741)
Proceeds from maturities and paydowns of investment securities held-to-maturity	130,938	128,278	101,893
Purchases of investment securities held-to-maturity	(155,328)	(86,790)	(69,171)
Proceeds from sales, maturities, and paydowns of investment securities available-for-sale	1,104,010	1,212,047	2,206,881
Purchases of investment securities available-for-sale	(1,325,704)	(932,034)	(1,423,141)
Proceeds from sales of loans and leases	17,748	66,223	17,609
Net loan and lease collections (originations)	1,506,233	792,025	1,185,688
Net decrease in other noninterest-bearing investments	19,109	40,014	19,407
Net purchases of premises and equipment	(88,580)	(68,894)	(77,669)
Proceeds from sales of other real estate owned	110,058	204,818	362,495
Net cash received (paid for) divestitures	3,786	(19,901)	0
Net cash used in investing activities	(1,393,160)	(1,879,542)	(2,464,125)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	228,807	3,286,823	1,940,697
Net change in short-term funds borrowed	(12,274)	(370,264)	(208,541)
Proceeds from issuance of long-term debt	646,408	757,610	106,065
Repayments of long-term debt	(832,122)	(372,891)	(8,663)
Payments of Debt Extinguishment Costs	(45,812)	0	0
Cash paid for preferred stock redemption	(799,468)	(1,542,500)	0
Proceeds from Issuance or sale of equity	794,143	143,240	25,686
Dividends paid on common and preferred stock	(119,660)	(133,581)	(156,135)
Other, net	(10,252)	(7,533)	(3,508)
Net cash provided by financing activities	(150,230)	1,760,904	1,695,601
Net increase (decrease) in cash and due from banks	(666,824)	617,557	300,224
Cash and due from banks at beginning of period	1,841,907	1,224,350	924,126
Cash and due from banks at end of period	1,175,083	1,841,907	1,224,350
Cash paid for interest	191,897	214,673	263,338
Net cash paid (refunds received) for income taxes	$ 181,318	$ 183,348	$ 3,743