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RELATED-PARTY TRANSACTIONS - Sabal Loan (Details) - Loan Purchase Commitments - Limited Liability Company Controlled By Affiliate Of Greater Than 5% Shareholder, Oaktree - USD ($)
12 Months Ended
Dec. 31, 2018
Jul. 31, 2018
Jun. 11, 2017
Jun. 26, 2015
Related Party Transaction [Line Items]        
Committed revolving repurchase facility     $ 40,000,000.0 $ 35,000,000.0
Amount outstanding   $ 3,500,000    
Largest aggregate amount of principal outstanding during period $ 32,500,000      
Proceeds from principal 210,400,000      
Proceeds from interest $ 370,000      
Maximum        
Related Party Transaction [Line Items]        
Committed revolving repurchase facility     $ 100,000,000.0