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Commercial Loans Held-For-Investment (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Commercial Loans [Line Items]    
Carrying Value $ 494,823 $ 313,010
Commercial Loans Held For Investment
   
Commercial Loans [Line Items]    
Principal balance 353,898 312,400
Unamortized discount, net (2,885) (3,806)
Recorded investment 351,013 308,594
Allowance for loan losses (5,660) (4,084)
Carrying Value $ 345,353 $ 304,510