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Commercial Loans Held-For-Investment at Amortized Cost (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Commercial Loans [Line Items]    
Carrying Value $ 468,766 $ 432,455
Commercial Loans Held-for-Investment, at Amortized Cost
   
Commercial Loans [Line Items]    
Principal balance 357,292 353,331
Unamortized discount, net (2,327) (2,614)
Recorded investment 354,965 350,717
Allowance for loan losses (8,317) (7,373)
Carrying Value $ 346,648 $ 343,344