LOANS HELD FOR SALE, AT FAIR VALUE - Summary of Changes in Balances (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Balance at beginning of period	$ 2,377,987	$ 2,256,551	$ 2,132,880	$ 2,373,427
Origination and purchase of loans	6,545,027	6,005,613	17,026,481	17,097,155
Sales	(6,311,590)	(6,219,208)	(16,527,301)	(17,648,412)
Transfers to loans held for investment	0	0	(122,532)	0
Repurchases	174,747	88,820	462,520	331,961
Principal payments	(19,396)	(46,886)	(200,983)	(93,671)
Fair value gain (loss)	(23,509)	14,142	19,219	10,288
Balance at end of period	$ 2,790,284	$ 2,070,748	$ 2,790,284	$ 2,070,748