LOANS HELD FOR SALE, AT FAIR VALUE - Components of Gain on Origination and Sale of Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Receivables [Abstract]
(Discount) premium from loan sales	$ (135,943)	$ (933,547)	$ 1,882,557
Servicing rights additions	277,387	647,716	1,610,596
Unrealized losses from derivative assets and liabilities	(35,430)	(134,519)	(308,200)
Realized gains from derivative assets and liabilities	55,631	1,215,013	347,014
Discount points, rebates and lender paid costs	306,115	275,981	(206,716)
Fair value gain (loss) on loans held for sale	64,940	(185,111)	(104,715)
Provision for loan loss obligation for loans sold	(8,179)	(136,993)	(7,185)
Total gain on origination and sale of loans, net	$ 524,521	$ 748,540	$ 3,213,351