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Pledged Assets - Additional Information (Detail) (USD $)
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Financial Instruments Owned and Pledged as Collateral [Line Items]   
Loans served as collateral to secure debt obligations$ 400,000,000$ 500,000$ 200,000
Short-term and long-term credit facilities authorized with the Federal Home Loan Bank of New York2,100,000,0001,600,000,0001,700,000,000
Financial Instruments Owned and Pledged as Collateral, Amount Eligible to be Repledged by Counterparty294,000,000  
Investment securities
   
Financial Instruments Owned and Pledged as Collateral [Line Items]   
Financial Instruments served as collateral to secure debt obligations1,600,000,0001,300,000,0001,700,000,000
Loans Held For Investment [Member]
   
Financial Instruments Owned and Pledged as Collateral [Line Items]   
Loans served as collateral to secure debt obligations3,900,000,0004,200,000,0004,300,000,000
Loans-held-in portfolio served as collateral to secure credit facilities authorized with the FHLB4,700,000,0003,800,000,000 
Loans Held For Investment And Available For Sale Securities [Member]
   
Financial Instruments Owned and Pledged as Collateral [Line Items]   
Loans-held-in portfolio and investment securities available-for-sale served as collateral to secure credit facilities authorized with the FHLB  3,700,000,000
Covered Under Loss Sharing Agreements With F D I C [Member]
   
Financial Instruments Owned and Pledged as Collateral [Line Items]   
Financial Instruments served as collateral to secure debt obligations4,500,000,0004,800,000,0004,900,000,000
Federal Reserve Bank Advances
   
Financial Instruments Owned and Pledged as Collateral [Line Items]   
Remaining unused borrowing capacity at the Fed discount window$ 2,500,000,000$ 2,700,000,000$ 2,700,000,000