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SERVICING RIGHTS, AT FAIR VALUE - Changes in Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Transfers and Servicing [Abstract]        
Due to changes in valuation inputs or assumptions $ (3,461) $ (3,009) $ 98,295 $ (112,059)
Other changes in fair value (99,230) (50,007) (323,107) (120,539)
Realized losses on sales of servicing rights (14,218) (2,606) (8,224) (2,549)
Net (loss) gain from derivatives hedging servicing rights (21,553) 26,309 (94,158) 125,330
Changes in fair value of servicing rights, net $ (138,462) $ (29,313) $ (327,194) $ (109,817)