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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds $ 307,339 $ 312,330 $ 1,163,045 $ 845,150
Trading Account Assets[Member]
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 302,873 308,553 1,149,199 834,352
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 199,824 180,827 767,393 575,642
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 101,922 107,301 353,987 238,285
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 1,127 20,425 27,819 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 4,466 3,777 13,846 10,798
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 302,873 308,553 1,149,199 834,352
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 302,873 308,553 1,149,199 834,352
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 199,824 180,827 767,393 575,642
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 101,922 107,301 353,987 238,285
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 1,127 20,425 27,819 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 3 [Member]
        
Assets        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Asset Obtained As Proceeds 4,466 3,777 13,846 10,798
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 $ 4,466 $ 3,777 $ 13,846 $ 10,798