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GUARANTEES (Details) - USD ($)
3 Months Ended
Jun. 15, 2016
Mar. 31, 2020
Dec. 31, 2019
Backstop Guarantee      
Guarantor Obligations [Line Items]      
Representation and warranty breach, threshold period for likely occurrence 5 years    
Minimum adjusted tangible new worth   $ 20,000,000  
Minimum available liquidity $ 5,000,000.0 $ 5,000,000  
Minimum available liquidity, percentage of aggregate unpaid principal balance 0.10% 0.10%  
Maximum amount of estimated future payments under the backstop guarantees   $ 1,405,182,222 $ 1,405,182,222
Indemnification Agreement      
Guarantor Obligations [Line Items]      
Maximum amount of estimated future payments under the backstop guarantees   $ 0  
Loan Review Services | Backstop Guarantee      
Guarantor Obligations [Line Items]      
Minimum available liquidity, percentage of aggregate unpaid principal balance   0.01%  
Oak Circle Capital Partners, LLC | Loan Review Services | Backstop Guarantee      
Guarantor Obligations [Line Items]      
Alternative backstop fee   $ 426,770