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LOANS HELD FOR SALE, AT FAIR VALUE - Summary of Changes in Balances (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]        
Balance at beginning of period $ 9,120,653 $ 3,303,438 $ 6,955,424 $ 3,681,840
Origination and purchase of loans 31,902,260 27,101,570 107,717,154 63,183,309
Sales (32,200,708) (25,598,952) (106,414,376) (62,192,701)
Repurchases 138,666 36,767 802,366 145,049
Principal payments (53,316) (6,820) (119,822) (43,306)
Fair value (loss) gain (33,819) 52,361 (67,010) 114,173
Balance at end of period $ 8,873,736 $ 4,888,364 $ 8,873,736 $ 4,888,364