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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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds $ 225,236 $ 307,339 $ 704,244 $ 1,163,045
Trading Account Assets[Member]
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 222,525 302,873 695,416 1,149,199
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 171,508 199,824 521,747 767,393
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 51,017 101,922 173,669 353,987
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 1,127 0 27,819
Servicing Asset At Fair Value Amount [Member]
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 2,711 4,466 8,828 13,846
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 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 2 [Member]
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 222,525 302,873 695,416 1,149,199
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 222,525 302,873 695,416 1,149,199
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 171,508 199,824 521,747 767,393
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 51,017 101,922 173,669 353,987
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 0 1,127 0 27,819
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 3 [Member]
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 2,711 4,466 8,828 13,846
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 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 $ 2,711 $ 4,466 $ 8,828 $ 13,846