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GUARANTEES - Narrative (Details) - USD ($)
12 Months Ended
Jun. 15, 2016
Dec. 31, 2023
Dec. 31, 2022
Backstop Guarantee      
Guarantor Obligations [Line Items]      
Representation and warranty breach, threshold period for likely occurrence 5 years    
Minimum adjusted tangible net worth   $ 20,000,000  
Minimum available liquidity   $ 5,000,000.0  
Minimum available liquidity, percentage of aggregate unpaid principal balance (percentage)   0.10%  
Maximum amount of estimated future payments under the backstop guarantees   $ 121,000,000.0 $ 171,700,000
Backstop Guarantee | Loan Review Services      
Guarantor Obligations [Line Items]      
Minimum available liquidity, percentage of aggregate unpaid principal balance (percentage)   0.01%  
Backstop Guarantee | FOAC | Loan Review Services      
Guarantor Obligations [Line Items]      
Alternative backstop fee   $ 426,770  
Indemnification Agreement      
Guarantor Obligations [Line Items]      
Maximum amount of estimated future payments under the backstop guarantees   $ 0