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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans Held-for-Investment, Net (Detail)
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 01, 2020
Mar. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
loan
Loans Held-for-Investment, Net        
Provision for loan losses   $ 1,100,000    
Loans charge off rate in forecasted period 0.09%   0.36%  
Loans charge off rate in remaining period 0.09%   0.09%  
Amortized cost of loans held for investment, current     $ 391,800,000 $ 531,900,000
Loans originated in 2018     162,000,000.0  
Loans originated in 2019     230,900,000  
Loans Held for Investment        
Transfers of financial assets accounted for as secured borrowings        
Loan portfolio transferred to third party     79,000,000.0 78,300,000
Other Liabilities        
Transfers of financial assets accounted for as secured borrowings        
Loan portfolio transferred to third party     71,100,000  
Secured borrowing     $ 71,100,000 $ 70,500,000
Loans Held for Investment        
Loans Held-for-Investment, Net        
Number of loans held for investment | loan     19 22
Unpaid principal balance of loans held for investment     $ 407,600,000 $ 546,600,000
Net unamortized deferred fees and costs     1,100,000 2,000,000.0
Allowance for loan losses     $ 2,000,000.0 $ 1,100,000
Reasonable and supportable forecast period used for determining CECL reserves     1 year  
Number of delinquent loans     1 1
Loans held for investment, delinquent     $ 14,700,000 $ 14,700,000
Number of impaired loans | loan     1 1
Loans held for investment, impaired     $ 14,700,000 $ 14,700,000
Loan originated in 2017     $ 14,700,000  
Number of loans on nonaccrual status | loan     1 1
Loans, non-accrual status     $ 14,700,000 $ 14,700,000
Specific reserve for loan     $ 600,000 $ 600,000
Loans Held for Investment | Maximum        
Loans Held-for-Investment, Net        
Loan term (in years)     3 years