CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net Income	$ 114,147	$ 120,817
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Provision for loan losses	219,922	219,636
Amortization of intangibles	5,124	4,510
Depreciation and amortization of premises and equipment	23,282	23,450
Net (accretion of discounts) amortization of premiums and deferred fees	(15,677)	(64,498)
Impairment Losses On Net Assets To Be Disposed Of	0	8,743
Impaiment losses on long-lives assets	0	0
Fair value adjustments of mortgage servicing rights	4,791	16,249
Fair value change in equity appreciation instrument	0	(8,323)
FDIC loss share (income) expense	12,680	(54,705)
FDIC deposit insurance expense	47,833	45,355
Adjustments (expense) to indemnity reserves on loans sold	9,273	19,302
Losses (earnings) from investments under equity method	4,217	218
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)	(154,686)	21,755
Loss (gain) on: [Abstract]
Disposition of premises and equipment	(6,864)	(1,992)
Early extinguishment of debt	24,950	0
Sale and valuation adjustments of investment securities	349	90
Sale of loans, including valuation adjustments on loans held-for-sale	(74)	5,538
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	(174,632)	(173,549)
Proceeds from sale of loans held-for-sale	145,588	65,667
Net disbursements on loans held-for-sale	(542,282)	(417,220)
Increase (Decrease) in Operating Assets [Abstract]
Trading securities	543,077	319,024
Accrued income receivable	2,889	8,676
Other assets	10,553	(32,659)
Increase (Decrease) in Accounts Payable and Accrued Liabilities [Abstract]
Interest payable	(4,499)	(949)
Pension and other postretirement benefit obligations	16,165	(123,084)
Other liabilities	11,364	(65,383)
Total adjustments	180,798	(201,056)
Net cash (used in) provided by operating activities	294,945	(80,239)
Cash flows from investing activities:
Net increase in money market investments	426,346	(404,598)
Payments To Acquire Investments Abstract
Available-for-sale	(890,777)	(856,543)
Held-to-maturity	(250)	(64,358)
Other	(76,033)	(69,504)
Proceeds From Sale Maturity And Collections Of Investments Abstract
Available-for-sale	780,832	707,567
Held-to-maturity	1,548	52,073
Other	81,626	56,162
Proceeds from sale of investment securities available-for-sale	0	19,143
Proceeds From Sale Of Other Investments	0	2,294
Net repayments on loans	539,177	779,606
Proceeds from sale of loans	41,476	225,698
Acquisition of loan portfolios	(705,819)	(744,390)
F D I C Indemnification Asset Cash Payments Received	262,807	15,694
Cash received from acquisitions	0	0
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	(1,018)	(860)
Acquisition of premises and equipment	(21,927)	(25,548)
Proceeds from sale of: [Abstract]
Premises and equipment	15,610	9,847
Proceeds from Sale of Other Productive Assets	1,026	0
Foreclosed assets	93,480	94,759
Net cash (used in) provided by investing activities	548,104	(171,455)
Net increase (decrease) in: [Abstract]
Deposits	(528,508)	1,198,252
Federal funds purchased and assets sold under agreements to repurchase	(363,354)	157,772
Other short-term borrowings	20,000	(212,920)
Payments of notes payable	(22,552)	(1,177,306)
Proceeds from issuance of notes payable	29,802	419,500
Proceeds from issuance of common stock	3,320	3,917
Net proceeds from issuance of depository shares	0	0
Dividends paid	(1,551)	(1,861)
Treasury stock acquired	(150)	(68)
Net cash (used in) provided by financing activities	(862,993)	387,286
Net (decrease) increase in cash and due from banks	(19,944)	135,592
Cash and due from banks at beginning of period	535,282	452,373
Cash and due from banks at end of period	$ 515,338	$ 587,965