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Initial fair value of assets obtained as proceeds from residential mortgage loans securitized (Detail) (Residential Mortgage, USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds $ 312,330 $ 239,924 $ 845,150 $ 844,880
Trading Account Assets[Member]
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 308,553 235,810 834,352 829,927
Trading Account Assets[Member] | Government National Mortgage Association Certificates And Obligations GNMA Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 180,827 193,731 575,642 666,601
Trading Account Assets[Member] | Federal National Mortgage Association Certificates And Obligations FNMA Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 107,301 42,079 238,285 163,326
Trading Account Assets[Member] | Federal Home Loan Mortgage Corporation Certificates And Obligations FHLMC Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 20,425   20,425  
Servicing Asset At Fair Value Amount [Member]
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 3,777 4,114 10,798 14,953
Available For Sale Securities Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0 0 0 0
Available For Sale Securities Member | Government National Mortgage Association Certificates And Obligations GNMA Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0 0 0 0
Available For Sale Securities Member | Federal National Mortgage Association Certificates And Obligations FNMA Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0 0 0 0
Fair Value, Inputs, Level 1 [Member]
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0 0 0 0
Fair Value, Inputs, Level 1 [Member] | Trading Account Assets[Member]
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0 0 0 0
Fair Value, Inputs, Level 1 [Member] | Trading Account Assets[Member] | Government National Mortgage Association Certificates And Obligations GNMA Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0 0 0 0
Fair Value, Inputs, Level 1 [Member] | Trading Account Assets[Member] | Federal National Mortgage Association Certificates And Obligations FNMA Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0 0 0 0
Fair Value, Inputs, Level 1 [Member] | Trading Account Assets[Member] | Federal Home Loan Mortgage Corporation Certificates And Obligations FHLMC Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0   0  
Fair Value, Inputs, Level 1 [Member] | Servicing Asset At Fair Value Amount [Member]
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0 0 0 0
Fair Value, Inputs, Level 1 [Member] | Available For Sale Securities Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0 0 0 0
Fair Value, Inputs, Level 1 [Member] | Available For Sale Securities Member | Government National Mortgage Association Certificates And Obligations GNMA Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0 0 0 0
Fair Value, Inputs, Level 1 [Member] | Available For Sale Securities Member | Federal National Mortgage Association Certificates And Obligations FNMA Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0 0 0 0
Fair Value, Inputs, Level 2 [Member]
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 308,553 235,810 834,352 829,927
Fair Value, Inputs, Level 2 [Member] | Trading Account Assets[Member]
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 308,553 235,810 834,352 829,927
Fair Value, Inputs, Level 2 [Member] | Trading Account Assets[Member] | Government National Mortgage Association Certificates And Obligations GNMA Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 180,827 193,731 575,642 666,601
Fair Value, Inputs, Level 2 [Member] | Trading Account Assets[Member] | Federal National Mortgage Association Certificates And Obligations FNMA Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 107,301 42,079 238,285 163,326
Fair Value, Inputs, Level 2 [Member] | Trading Account Assets[Member] | Federal Home Loan Mortgage Corporation Certificates And Obligations FHLMC Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 20,425   20,425  
Fair Value, Inputs, Level 2 [Member] | Servicing Asset At Fair Value Amount [Member]
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0 0 0 0
Fair Value, Inputs, Level 2 [Member] | Available For Sale Securities Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0 0 0 0
Fair Value, Inputs, Level 2 [Member] | Available For Sale Securities Member | Government National Mortgage Association Certificates And Obligations GNMA Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0 0 0 0
Fair Value, Inputs, Level 2 [Member] | Available For Sale Securities Member | Federal National Mortgage Association Certificates And Obligations FNMA Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0 0 0 0
Fair Value, Inputs, Level 3 [Member]
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 3,777 4,114 10,798 14,953
Fair Value, Inputs, Level 3 [Member] | Trading Account Assets[Member]
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0 0 0 0
Fair Value, Inputs, Level 3 [Member] | Trading Account Assets[Member] | Government National Mortgage Association Certificates And Obligations GNMA Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0 0 0 0
Fair Value, Inputs, Level 3 [Member] | Trading Account Assets[Member] | Federal National Mortgage Association Certificates And Obligations FNMA Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0 0 0 0
Fair Value, Inputs, Level 3 [Member] | Trading Account Assets[Member] | Federal Home Loan Mortgage Corporation Certificates And Obligations FHLMC Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0   0  
Fair Value, Inputs, Level 3 [Member] | Servicing Asset At Fair Value Amount [Member]
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 3,777 4,114 10,798 14,953
Fair Value, Inputs, Level 3 [Member] | Available For Sale Securities Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0 0 0 0
Fair Value, Inputs, Level 3 [Member] | Available For Sale Securities Member | Government National Mortgage Association Certificates And Obligations GNMA Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 0 0 0 0
Fair Value, Inputs, Level 3 [Member] | Available For Sale Securities Member | Federal National Mortgage Association Certificates And Obligations FNMA Member
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds $ 0 $ 0 $ 0 $ 0