EXCESS MORTGAGE SERVICING RIGHTS - Summary of Investments in Excess MSRs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]
Weighted Average Life (Years)	3 years 8 months 12 days
Original and Recaptured Pools
Schedule of Equity Method Investments [Line Items]
Original and Recaptured Pools	$ (915)	$ (1,867)
Corporate Joint Venture | Servicer advance investments
Schedule of Equity Method Investments [Line Items]
UPB	12,955,658		$ 13,316,828
Excess MSRs
Schedule of Equity Method Investments [Line Items]
UPB	$ 52,144,523
Weighted Average Life (Years)	5 years 10 months 24 days
Amortized Cost Basis	$ 308,638
Carrying Value	$ 354,923		$ 369,162
Excess MSRs | Minimum
Schedule of Equity Method Investments [Line Items]
Interest in Excess MSR	65.00%
Excess MSRs | Minimum | Mr. Cooper
Schedule of Equity Method Investments [Line Items]
Interest in Excess MSR	20.00%
Excess MSRs | Maximum
Schedule of Equity Method Investments [Line Items]
Interest in Excess MSR	80.00%
Excess MSRs | Maximum | Mr. Cooper
Schedule of Equity Method Investments [Line Items]
Interest in Excess MSR	35.00%
Excess MSRs | Weighted Average
Schedule of Equity Method Investments [Line Items]
Interest in Excess MSR	69.90%
Excess MSRs | Weighted Average | Mr. Cooper
Schedule of Equity Method Investments [Line Items]
Interest in Excess MSR	30.90%