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SERVICING RIGHTS, AT FAIR VALUE - Change in Servicing Rights (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Servicing Asset at Fair Value, Amount [Roll Forward]        
Balance at beginning of period $ 2,078,187 $ 1,766,088 $ 1,999,402 $ 1,124,302
Additions 180,455 427,458 450,215 957,001
Sales proceeds, net (86,464) (182,113) (399,314) (182,788)
Due to changes in valuation inputs or assumptions 98,795 (129,267) 297,792 101,757
Due to collection/realization of cash flows (66,380) (105,771) (143,502) (223,877)
Balance at end of period $ 2,204,593 $ 1,776,395 $ 2,204,593 $ 1,776,395