MORTGAGE SERVICING RIGHTS AND MSR FINANCING RECEIVABLES - Schedule of Components of Servicing Revenue, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Servicing Asset at Amortized Cost [Line Items]
Contractually Specified Servicing Fee Income, Statement of Income or Comprehensive Income [Extensible Enumeration]			Origination and Servicing, Investment Portfolio, Mortgage Loans Receivable and Corporate
Ancillary Fee Income, Servicing Financial Asset, Statement of Income or Comprehensive Income [Extensible Enumeration]			Origination and Servicing, Investment Portfolio, Mortgage Loans Receivable and Corporate
Change in valuation inputs and assumptions, net of realized gains (losses)			$ 291,440
Excess spread financing			2,200
Change in valuation and assumptions, excess spread financing			6,800
MSRs
Servicing Asset at Amortized Cost [Line Items]
Servicing fee revenue, net and interest income from MSRs and MSR financing receivables	$ 453,989	$ 432,750	884,103	$ 871,800
Ancillary and other fees	44,989	32,597	84,766	63,204
Servicing fee revenue, net and fees	498,978	465,347	968,869	935,004
Realization of cash flows	(165,138)	(139,410)	(281,977)	(245,101)
Change in valuation inputs and assumptions, net of realized gains (losses)	97,240	161,442	298,254	124,829
Servicing revenue, net	$ 431,080	$ 487,379	$ 985,146	$ 814,732