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Carrying Value for Residential Loans Held-for-Investment (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items]    
Carrying Value $ 2,724,381 $ 2,166,434
Residential Loans Held for Investment
   
Mortgage Loans on Real Estate [Line Items]    
Principal balance 1,625,890 1,770,803
Unamortized premium, net 14,586 16,791
Recorded investment 1,640,476 1,787,594
Allowance for loan losses (23,972) (25,427)
Carrying Value $ 1,616,504 $ 1,762,167