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Relationship with Bayview Lending Group LLC and Bayview Financial Holdings, L.P. - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Schedule Of Equity Method Investments Joint Ventures [Line Items]          
Minority interest in Bayview Lending Group LLC     20.00%    
Carrying value of minority interest investment in Bayview Lending Group LLC $ 80,000,000   $ 80,000,000    
Outstanding principal balances of commercial mortgage servicing rights obtained from Bayview Financial 3,400,000,000   3,400,000,000   3,800,000,000
Outstanding principal balances of residential mortgage loans from Bayview Financial 2,400,000,000   2,400,000,000   2,700,000,000
Revenues from servicing residential and small balance commercial mortgage loans purchased from BLG and Bayview Financial 7,000,000 9,000,000 23,000,000 27,000,000  
Collateralized mortgage obligations in available-for-sale investment securities portfolio securitized by Bayview Financial 4,000,000   4,000,000   11,000,000
Investment securities in held-to-maturity portfolio securitized by Bayview Financial 225,000,000   225,000,000   242,000,000
Bayview and Colonial [Member]
         
Schedule Of Equity Method Investments Joint Ventures [Line Items]          
Outstanding principal balances of residential mortgage loans from Bayview Financial 45,500,000,000   45,500,000,000   11,400,000,000
Revenues from servicing residential and small balance commercial mortgage loans purchased from BLG and Bayview Financial 8,000,000 2,000,000 12,000,000 7,000,000  
Residential real estate loans addition $ 35,000,000,000