LOANS HELD FOR SALE, AT FAIR VALUE - Summary of Changes in Balances (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Balance at beginning of period	$ 2,300,058	$ 2,039,367	$ 2,132,880	$ 2,373,427
Origination and purchase of loans	5,979,131	6,200,295	10,481,454	11,091,542
Sales	(5,784,166)	(6,046,785)	(10,215,710)	(11,429,204)
Transfers to loans held for investment	(122,532)	0	(122,532)	0
Repurchases	150,060	109,683	287,773	243,141
Principal payments	(155,514)	(31,688)	(181,587)	(46,785)
Fair value gain (loss)	(10,950)	14,321	(4,291)	24,430
Balance at end of period	$ 2,377,987	$ 2,256,551	$ 2,377,987	$ 2,256,551