CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net Income	$ 436,296	$ 161,335
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Provision for loan losses	545,927	326,130
Amortization of intangibles	7,403	7,605
Depreciation and amortization of premises and equipment	37,056	34,953
Net (accretion of discounts) amortization of premiums and deferred fees	(48,195)	(22,118)
Fair value adjustments of mortgage servicing rights	6,862	7,217
Fair value change in equity appreciation instrument	0	0
FDIC loss share (income) expense	44,887	19,387
Amortization Of Prepaid F D I C Assesment	0	30,157
Adjustments (expense) to indemnity reserves on loans sold	30,162	17,990
Losses (earnings) from investments under equity method	(42,740)	(28,748)
Deferred income tax expense (benefit)	(303,038)	(150,201)
Loss (gain) on: [Abstract]
Disposition of premises and equipment	(3,060)	(8,253)
Net Gain Loss On Sale And Valuation Adjustments On Investment Securities	0	285
Gain Loss On Sales Of Loans Net Including Mortgage Banking Activities	37,564	(18,569)
Sale of stock in equity method investee	(312,589)	0
Gains (Losses) on Sales of Other Assets	0	(2,545)
Gains Losses On Sales Of Other Real Estate	45,045	4,147
Acquisitions of loans held-for-sale	(15,335)	(288,844)
Proceeds from sale of loans held-for-sale	168,046	242,088
Net disbursements on loans held-for-sale	(1,169,094)	(860,804)
Increase (Decrease) in Operating Assets [Abstract]
Trading securities	1,193,265	849,304
Accrued income receivable	2,847	(8,735)
Other assets	(610)	(30,247)
Increase (Decrease) in Accounts Payable and Accrued Liabilities [Abstract]
Interest payable	(9,480)	(7,553)
Pension and other postretirement benefit obligations	6,459	24,156
Other liabilities	(22,590)	(23,112)
Total adjustments	198,792	113,690
Net cash (used in) provided by operating activities	635,088	275,025
Cash flows from investing activities:
Net increase in money market investments	123,792	450,511
Payments To Acquire Investments Abstract
Available-for-sale	(1,661,080)	(1,284,834)
Held-to-maturity	(250)	(250)
Other	(145,691)	(152,607)
Proceeds From Sale Maturity And Collections Of Investments Abstract
Available-for-sale	1,576,112	1,166,618
Held-to-maturity	4,278	4,398
Other	132,270	119,098
Proceeds from sale of investment securities available-for-sale	0	8,031
Net repayments on loans	1,014,907	687,582
Proceeds from sale of loans	310,767	51,677
Acquisition of loan portfolios	(1,727,454)	(1,051,588)
Payments received from FDIC under loss sharing agreements	52,758	327,739
Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital	438	130,580
Proceeds from sale of stock in equity method investee	363,492	0
Mortgage servicing rights purchased	(45)	(1,620)
Acquisition of premises and equipment	(27,214)	(34,336)
Proceeds from sale of: [Abstract]
Premises and equipment	9,438	20,612
Proceeds from Sale of Other Productive Assets	0	1,026
Foreclosed assets	200,546	142,019
Net cash (used in) provided by investing activities	227,064	584,656
Net increase (decrease) in: [Abstract]
Deposits	(642,427)	(1,624,634)
Federal funds purchased and assets sold under agreements to repurchase	(223,544)	(196,533)
Other short-term borrowings	190,000	910,000
Payments of notes payable	(331,835)	(72,815)
Proceeds from issuance of notes payable	73,154	61,331
Proceeds from issuance of common stock	4,952	7,788
Dividends paid	(2,792)	(2,482)
Net Payments For Repurchase Of Common Stock	433	276
Net cash (used in) provided by financing activities	(932,925)	(917,621)
Net (decrease) increase in cash and due from banks	(70,773)	(57,940)
Cash and due from banks at beginning of period	439,363	535,282
Cash and due from banks at end of period	$ 368,590	$ 477,342