SERVICING RIGHTS, AT FAIR VALUE - Changes in Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Transfers and Servicing [Abstract]
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)
Realized (losses) gains on sales of servicing rights	(2,493)	6,089	7,540	5,992
Net (loss) gain from derivatives hedging servicing rights	(63,429)	83,851	(263,720)	(72,605)
Changes in fair value of servicing rights, net	$ (33,507)	$ (145,098)	$ (101,890)	$ (188,733)