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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans Held-for-Investment, Net (Detail)
9 Months Ended
Sep. 30, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
loan
Transfers of financial assets accounted for as secured borrowings    
Loan portfolio transferred to third party $ 70,100,000  
Loans Held for Investment    
Transfers of financial assets accounted for as secured borrowings    
Loan portfolio transferred to third party 77,800,000  
Accounts Payable and Other Liabilities    
Transfers of financial assets accounted for as secured borrowings    
Secured borrowing $ 70,100,000  
Loans Held for Investment    
Loans Held-for-Investment, Net    
Number of loans held for investment | loan 16 14
Unpaid principal balance of loans held for investment $ 457,500,000 $ 503,500,000
Net unamortized deferred fees and costs 2,200,000 6,000,000.0
Allowance for loan losses $ 900,000 200,000
Number of delinquent loans 1  
Loans held for investment, delinquent $ 14,700,000 0
Number of impaired loans | loan 1  
Loans held for investment, impaired $ 14,700,000 0
Number of loans on nonaccrual status | loan 1  
Loans, non-accrual status $ 14,700,000 0
Loans Held for Investment | Maximum    
Loans Held-for-Investment, Net    
Loan term (in years) 3 years  
Subordinated Note Participation    
Loans Held-for-Investment, Net    
Unpaid principal balance of loans held for investment $ 84,300,000 $ 150,000,000.0