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Loans (Details Textuals) (USD $)
Mar. 31, 2011
Dec. 31, 2010
Mar. 31, 2010
Loans [Line Items]   
Total retained loans$ 675,437,000,000$ 685,498,000,000$ 706,841,000,000
Loans (Numeric) [Abstract]   
Nonaccrual mortgage loans that are insured by U.S. government agencies excluded from nonaccrual loans9,800,000,00010,500,000,000 
Prime mortgage loans repurchased from Government National Mortgage Association pools, which are insured by U.S. government agencies13,000,000,00012,900,000,000 
Mortgage loans that are insured by U.S. government agencies excluded from the percentage of 30+ days past due to retained loans10,400,000,00011,400,000,000 
Deferred loan costs2,400,000,0001,900,000,000 
Wholesale loans restructured in troubled debt restructuring1,500,000,0001,800,000,000 
Non performing wholesale loans restructured640,000,000 663,000,000
Modified loans repurchased from U.S.government agencies excluded from troubled debt restructurings3,600,0003,000,000 
Allowance for purchased credit impaired loans4,941,000,0004,941,000,000 
Student and other loans that are 30 or more days past due and still accruing which are insured by U.S. government agencies under the Federal Family Education Loan Program1,000,000,0001,100,000,000 
Total other consumer [Member]
   
Loans [Line Items]   
Total retained loans79,457,000,00080,490,000,000 
Auto [Member]
   
Loans [Line Items]   
Total retained loans47,411,000,00048,367,000,000 
Noncompliance With Modified Terms [Member] | Consumer Credit Card Financing Receivable [Member]
   
Loans [Line Items]   
Modified credit card loans that have reverted to original payment terms934,000,0001,200,000,000 
Completion of Short Term Modification [Member] | Consumer Credit Card Financing Receivable [Member]
   
Loans [Line Items]   
Modified credit card loans that have reverted to original payment terms$ 527,000,000$ 590,000,000