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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans Held-for-Investment, Net (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
loan
Dec. 31, 2015
USD ($)
loan
Loans Held-for-Investment, Net    
Number of loans held for investment | loan 12 13
Unpaid principal balance of loans held for investment $ 222,300 $ 233,400
Net unamortized deferred fees and costs 1,500 1,100
Allowance for loan losses $ 400 800
Floating Rate Loans | Maximum    
Loans Held-for-Investment, Net    
Loan term (in years) 3 years  
Loans Held for Investment    
Loans Held-for-Investment, Net    
Loans held for investment, delinquent $ 0 0
Loans held for investment, impaired 0 0
Loans, non-accrual status $ 0 $ 0