MORTGAGE SERVICING RIGHTS AND MSR FINANCING RECEIVABLES (AS RESTATED) - Schedule of Servicing Fee Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Investments in Mortgage Servicing Rights [Line Items]
Contractually Specified Servicing Fee Income, Statement of Income or Comprehensive Income [Extensible Enumeration]													Revenue
Ancillary Fee Income, Servicing Financial Asset, Statement of Income or Comprehensive Income [Extensible Enumeration]													Revenue
Realization of cash flows						$ (141,616)	$ (180,265)	$ (200,325)		$ (380,590)		$ (522,206)		$ (631,120)
Change in valuation inputs and assumptions, net of realized gains (losses)													$ 46,706	(1,448,811)
MSRs
Schedule of Investments in Mortgage Servicing Rights [Line Items]
Servicing fee revenue, net and interest income from MSRs and MSR financing receivables													1,735,060	1,698,977	$ 1,445,778
Ancillary and other fees													124,297	132,377	113,045
Servicing fee revenue, net and fees													1,859,357	1,831,354	1,558,823
Realization of cash flows	$ (134,884)	$ (138,993)	$ (139,410)	$ (105,691)	$ (108,914)				$ (245,101)		$ (384,094)		(518,978)	(631,120)	(1,192,646)
Change in valuation inputs and assumptions, net of realized gains (losses)													(46,706)	1,448,811	680,088
Change in fair value of derivative instruments													0	(11,316)	(30,481)
Gain (loss) on settlement of derivative instruments													0	(79,041)	(34,724)
Servicing revenue, net													$ 1,293,673	$ 2,558,688	$ 981,060