CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net Income	$ 86,409	$ (120,307)
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Provision for loan losses	73,072	223,856
Amortization of intangibles	2,504	2,468
Depreciation and amortization of premises and equipment	11,965	12,254
Net (accretion of discounts) amortization of premiums and deferred fees	(39,571)	(14,257)
Fair value adjustments of mortgage servicing rights	8,096	5,615
FDIC loss share (income) expense	24,206	26,266
Adjustments (expense) to indemnity reserves on loans sold	10,347	16,143
Losses (earnings) from investments under equity method	(16,930)	(9,594)
Deferred income tax expense (benefit)	13,898	(60,528)
Loss (gain) on: [Abstract]
Disposition of premises and equipment	(1,671)	(1,468)
Gain Loss On Sales Of Loans Net Including Mortgage Banking Activities	(18,953)	48,959
Gains Losses On Sales Of Other Real Estate	(1,199)	38,363
Acquisitions of loans held-for-sale	(76,125)	(15,335)
Proceeds from sale of loans held-for-sale	45,115	51,000
Net disbursements on loans held-for-sale	(179,057)	(382,810)
Increase (Decrease) in Operating Assets [Abstract]
Trading securities	218,997	423,236
Accrued income receivable	5,641	(9,815)
Other assets	(1,463)	28,181
Increase (Decrease) in Accounts Payable and Accrued Liabilities [Abstract]
Interest payable	(2,680)	(255)
Pension and other postretirement benefit obligations	(1,562)	1,470
Other liabilities	(1,193)	(28,586)
Total adjustments	73,437	355,163
Net cash (used in) provided by operating activities	159,846	234,856
Cash flows from investing activities:
Net increase in money market investments	(763,980)	(258,664)
Payments To Acquire Investments Abstract
Available-for-sale	(436,233)	(736,069)
Held-to-maturity	0	(250)
Other	(34,768)	(49,018)
Proceeds From Sale Maturity And Collections Of Investments Abstract
Available-for-sale	194,949	497,175
Held-to-maturity	1,888	2,078
Other	49,964	35,884
Net repayments on loans	205,660	468,309
Proceeds from sale of loans	42,238	43,044
Acquisition of loan portfolios	(201,385)	(1,026,485)
Payments received from FDIC under loss sharing agreements	81,327	(107)
Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital	0	438
Mortgage servicing rights purchased	0	(45)
Acquisition of premises and equipment	(11,017)	(11,983)
Proceeds from sale of: [Abstract]
Premises and equipment	6,385	4,205
Foreclosed assets	38,830	71,930
Net cash (used in) provided by investing activities	(826,142)	(959,558)
Net increase (decrease) in: [Abstract]
Deposits	559,972	(3,795)
Federal funds purchased and assets sold under agreements to repurchase	548,921	248,923
Other short-term borrowings	(400,000)	315,000
Payments of notes payable	(110,514)	(48,281)
Proceeds from issuance of notes payable	31,905	14,882
Proceeds from issuance of common stock	1,666	1,545
Dividends paid	(931)	(620)
Net Payments For Repurchase Of Common Stock	(17)	(25)
Net cash (used in) provided by financing activities	631,002	527,629
Net (decrease) increase in cash and due from banks	(35,294)	(197,073)
Cash and due from banks at beginning of period	423,211	439,363
Cash and due from banks at end of period	$ 387,917	$ 242,290