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Transfers of Financial Assets and Mortgage Servicing Rights - Additional Information (Detail) (USD $)
3 Months Ended9 Months Ended3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Residential Mortgage
Sep. 30, 2010
Residential Mortgage
Sep. 30, 2011
Residential Mortgage
Sep. 30, 2010
Residential Mortgage
Sep. 30, 2011
Loans
Sep. 30, 2010
Loans
Sep. 30, 2011
Serviced Mortgage Loans [Member]
Dec. 31, 2010
Serviced Mortgage Loans [Member]
Sep. 30, 2010
Serviced Mortgage Loans [Member]
Sep. 30, 2011
Buy Back Option Program [Member]
Dec. 31, 2010
Buy Back Option Program [Member]
Sep. 30, 2010
Buy Back Option Program [Member]
Sep. 30, 2011
Loans With Recourse [Member]
Dec. 31, 2010
Loans With Recourse [Member]
Sep. 30, 2010
Loans With Recourse [Member]
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]                   
Servicing rights on whole loan sales, principal balance        $ 84,000,000$ 63,000,000         
Mortgage securitizations / Whole Loan sales, net gains    1,600,0003,000,00012,000,00013,200,0001,700,0001,400,000         
Mortgage loans serviced          17,400,000,00018,400,000,00018,000,000,000   3,600,000,0004,000,000,0004,100,000,000
Mortgage Servicing Fees Excluding Fair Value12,200,00011,700,00037,000,00035,400,000               
Weighted average mortgage servicing fees0.27%0.27%0.27%0.27%               
Mortgage loans related to buy-back option program             $ 163,000,000$ 168,000,000$ 163,000,000