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RELATED PARTY TRANSACTIONS - Schedule of Related Party Transactions (Details) - Joint Venture - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]          
Loan processing and administrative services fee income $ 3,650 $ 3,835 $ 10,757 $ 10,017  
Loan origination broker fees expense 22,749 $ 21,456 63,457 $ 55,323  
Amounts (payable) receivable from joint ventures $ (3,307)   $ (3,307)   $ 2,196