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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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds $ 279,874 $ 270,415 $ 532,821 $ 604,956
Trading Account Assets[Member]
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 276,086 265,525 525,800 594,117
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 204,636 217,296 394,815 472,870
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 71,450 48,229 130,985 121,247
Servicing Asset At Fair Value Amount [Member]
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 3,788 4,890 7,021 10,839
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] | 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 276,086 265,525 525,800 594,117
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 276,086 265,525 525,800 594,117
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 204,636 217,296 394,815 472,870
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 71,450 48,229 130,985 121,247
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 3,788 4,890 7,021 10,839
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] | Servicing Asset At Fair Value Amount [Member]
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 3,788 4,890 7,021 10,839
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