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GUARANTEES (Details) - USD ($)
6 Months Ended
Jun. 15, 2016
Jun. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Backstop Guarantee        
Guarantor Obligations [Line Items]        
Representation and warranty breach, threshold period for likely occurance 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