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Loans and Allowance for Credit Losses (Details Textual) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Jan. 28, 2011
Dec. 31, 2010
Loans and Allowance for Credit Losses (Textual) [Abstract]      
Loans pledged at the Federal Home Loan Bank ("FHLB")$ 62,800,000,000 $ 62,800,000,000  $ 62,800,000,000
Loans pledged at the Federal Reserve Bank46,100,000,000 46,100,000,000  44,600,000,000
Unearned interest and deferred fees and costs on loans1,100,000,000 1,100,000,000  1,300,000,000
Expected reimbursements from the FDIC2,400,000,000 2,400,000,000  3,100,000,000
Purchased impaired loans nonperforming assets300,000,000 300,000,000  500,000,000
Fair value of impaired loans    238,000,000 
Receivables of impaired loans acquired in FCB transactions, including covered and uncovered portion    502,000,000 
Cash Receivables of impaired loans to be collected with interest    338,000,000 
Fair value of non-impaired loans    828,000,000 
Receivables of non-impaired loans acquired in FCB transactions    1,200,000,000 
Cash Receivables of non-impaired loans not expected to be collected    184,000,000 
Period of accruing loans related nonperforming assets and related ratios  90 days   
Partial charge off period of loans secured by 1-4 family properties  180 days   
Charge off period of Revolving consumer lines and credit cards  180 days   
Charge off period of closed-end consumer loans, other than loans secured by 1-4 family properties  120 days   
Extension included in Commercial Real Estate Modifications  upto 12 Months   
Net gains on the sale of loan74,000,000105,000,000340,000,000308,000,000  
Period for capturing full economic cycle in the evaluation  11 years   
Minimum amount of loans for which allowance recorded for impaired purposes.  5,000,000   
Loans in trial period arrangements96,000,000 96,000,000   
Maximum percentage of residential mortgage loan balances in trial period arrangements1.00% 1.00%   
Accrued interest and outstanding advances capitalized into the modified loan balance32,000,000 85,000,000   
Government National Mortgage Association [Member]
      
Additional loans and allowance for credit losses (Textual) [Abstract]      
Loans 30-89 days past due purchased from Government National Mortgage Association mortgage pools whose payments are insured by the Federal Housing Administration and classified as current507,000,000 507,000,000  439,000,000
Loans 90 days or more past due purchased from Government National Mortgage Association mortgage pools whose payments are insured by the Federal Housing Administration and classified as current2,500,000,000 2,500,000,000  2,600,000,000
Government National Mortgage Association [Member] | Trouble Debt Restructure [Member]
      
Additional loans and allowance for credit losses (Textual) [Abstract]      
GNMA loans 90 days or more past due classified with a pass rating2,500,000,000 2,500,000,000  2,600,000,000
Restructured GNMA loans that are classified with a pass rating$ 1,800,000,000 $ 1,800,000,000  $ 1,100,000,000