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SERVICING RIGHTS, AT FAIR VALUE - Servicing Rights Sensitivity Analysis (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Transfers and Servicing [Abstract]    
Fair Value of Servicing Rights, net $ 1,836,694 $ 1,124,302
Discount Rate, Increase 100 basis points (80,001) (45,745)
Discount Rate, Increase 200 basis points (153,883) (87,800)
Cost of Servicing. Increase 10% (18,600) (11,556)
Cost of Servicing. Increase 20% (37,284) (23,112)
Prepayment Speed, Increase 10% (66,889) (63,351)
Prepayment Speed, Increase 20% $ (130,552) $ (122,294)