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SERVICING RIGHTS, AT FAIR VALUE - Change in Servicing Rights (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Servicing Asset at Fair Value, Amount [Roll Forward]        
Balance at beginning of period $ 1,776,395 $ 569,927 $ 1,124,302 $ 444,443
Additions 345,882 262,401 1,302,884 574,768
Sales proceeds, net (182,892) (2,319) (365,680) (9,620)
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)
Balance at end of period 1,836,694 776,993 1,836,694 776,993
Servicing liability $ 4,800 $ 3,500 $ 4,800 $ 3,500