CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net Income	$ 161,335	$ 148,350
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Provision for loan losses	326,130	395,912
Amortization of intangibles	7,605	6,973
Depreciation and amortization of premises and equipment	34,953	34,864
Net (accretion of discounts) amortization of premiums and deferred fees	(22,118)	(97,668)
Impairment Losses On Net Assets To Be Disposed Of	0	6,085
Impaiment losses on long-lives assets	0	0
Fair value adjustments of mortgage servicing rights	7,217	26,373
Fair value change in equity appreciation instrument	0	(8,323)
FDIC loss share (income) expense	19,387	(49,344)
Amortization Of Prepaid F D I C Assesment	30,157	68,640
Adjustments (expense) to indemnity reserves on loans sold	17,990	29,587
Losses (earnings) from investments under equity method	9,788	11,250
Earnings from changes in fair value related to instruments measured at fair value pursuant to the fair value option	0	0
Stock options expense	0	0
Deferred income tax expense (benefit)	(150,201)	44,608
Loss (gain) on: [Abstract]
Disposition of premises and equipment	(8,253)	(2,019)
Early extinguishment of debt	24,950	0
Sale and valuation adjustments of investment securities	285	(8,044)
Sale of loans, including valuation adjustments on loans held-for-sale	(18,569)	(14,756)
Sale of equity method investment	0	(16,907)
Sale of processing and technology business, net of transaction costs	0	0
Gains (Losses) on Sales of Other Assets	(2,545)	0
Acquisitions of loans held-for-sale	(288,844)	(253,401)
Proceeds from sale of loans held-for-sale	242,088	101,549
Net disbursements on loans held-for-sale	(860,804)	(617,591)
Increase (Decrease) in Operating Assets [Abstract]
Trading securities	849,304	492,882
Accrued income receivable	(8,735)	14,924
Other assets	65,944	(25,576)
Increase (Decrease) in Accounts Payable and Accrued Liabilities [Abstract]
Interest payable	(7,553)	(7,344)
Pension and other postretirement benefit obligations	24,156	(128,802)
Other liabilities	(48,062)	(109,155)
Total adjustments	244,270	(105,283)
Net cash (used in) provided by operating activities	405,605	43,067
Cash flows from investing activities:
Net increase in money market investments	450,511	(289,844)
Payments To Acquire Investments Abstract
Available-for-sale	(1,284,834)	(1,198,613)
Held-to-maturity	(250)	(65,358)
Other	(152,607)	(116,582)
Proceeds From Sale Maturity And Collections Of Investments Abstract
Available-for-sale	1,166,618	979,868
Held-to-maturity	4,398	54,617
Other	119,098	104,231
Proceeds from sale of investment securities available-for-sale	8,031	35,099
Proceeds From Sale Of Other Investments	0	2,294
Net repayments on loans	687,582	1,013,103
Proceeds from sale of loans	51,677	290,119
Acquisition of loan portfolios	(1,051,588)	(985,675)
F D I C Indemnification Asset Cash Payments Received	327,739	561,111
Cash received from acquisitions	0	(500)
Net proceeds from sale of equity method investments	0	31,503
Net proceeds from sale of processing and technology business	0	0
Mortgage servicing rights purchased	(1,620)	(1,251)
Acquisition of premises and equipment	(34,336)	(37,868)
Proceeds from sale of: [Abstract]
Premises and equipment	20,612	12,314
Proceeds from Sale of Other Productive Assets	1,026	0
Foreclosed assets	142,019	133,017
Net cash (used in) provided by investing activities	454,076	521,585
Net increase (decrease) in: [Abstract]
Deposits	(1,624,634)	1,192,652
Federal funds purchased and assets sold under agreements to repurchase	(196,533)	189,056
Other short-term borrowings	910,000	(198,022)
Payments of notes payable	(72,815)	(2,055,254)
Proceeds from issuance of notes payable	61,331	419,500
Proceeds from issuance of common stock	7,788	5,394
Net proceeds from issuance of depository shares	0	0
Dividends paid	(2,482)	(2,792)
Treasury stock acquired	(276)	(418)
Net cash (used in) provided by financing activities	(917,621)	(449,884)
Net (decrease) increase in cash and due from banks	(57,940)	114,768
Cash and due from banks at beginning of period	535,282	452,373
Cash and due from banks at end of period	$ 477,342	$ 567,141