MORTGAGE SERVICING RIGHTS AND MSR FINANCING RECEIVABLES - Schedule of Servicing Fee Revenue (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
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
Change in valuation inputs and assumptions, net of realized gains (losses)(B)	$ (415,515,000)	$ 46,706,000
Gain (loss) on settlement of derivative instruments	0		$ (79,000,000)
Excess spread financing	4,900,000	0	0
Change in valuation and assumptions, excess spread financing	19,200,000	0	0
MSRs
Schedule of Investments in Mortgage Servicing Rights [Line Items]
Servicing fee revenue, net and interest income from MSRs and MSR financing receivables	1,833,221,000	1,735,060,000	1,698,977,000
Ancillary and other fees	160,098,000	124,297,000	132,377,000
Servicing fee revenue, net and fees	1,993,319,000	1,859,357,000	1,831,354,000
Realization of cash flows(A)	(602,241,000)	(518,978,000)	(631,120,000)
Change in valuation inputs and assumptions, net of realized gains (losses)(B)	434,667,000	(46,706,000)	1,448,811,000
Change in fair value of derivative instruments	0	0	(11,316,000)
Gain (loss) on settlement of derivative instruments	0	0	(79,041,000)
Servicing revenue, net	$ 1,825,745,000	$ 1,293,673,000	$ 2,558,688,000