MORTGAGE SERVICING RIGHTS AND MSR FINANCING RECEIVABLES - Schedule of Investment in MSRs and MSR Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Schedule of Mortgage Servicing Rights [Line Items]
Weighted Average Life (Years)	3 years 8 months 12 days
Carrying Value	$ 10,133,041	$ 10,321,671
Residential mortgage loans subject to repurchase	2,432,605	2,745,756	$ 1,845,889
Mortgage Servicing Rights and Mortgage Servicing Rights Financing Receivable
Schedule of Mortgage Servicing Rights [Line Items]
UPB of Underlying Mortgages	$ 591,114,997	$ 590,214,351
Weighted Average Life (Years)	6 years 3 months 18 days	6 years 4 months 24 days
Carrying Value	$ 10,133,041	$ 10,321,671
MSRs | Weighted Average
Schedule of Mortgage Servicing Rights [Line Items]
Discount rate	8.90%	8.90%
MSRs | Minimum
Schedule of Mortgage Servicing Rights [Line Items]
Discount rate	8.80%	8.70%
MSRs | Maximum
Schedule of Mortgage Servicing Rights [Line Items]
Discount rate	10.30%	10.30%
GSE | MSRs
Schedule of Mortgage Servicing Rights [Line Items]
UPB of Underlying Mortgages	$ 382,089,209	$ 383,014,320
Weighted Average Life (Years)	6 years 4 months 24 days	6 years 6 months
Carrying Value	$ 6,195,239	$ 6,413,199
Non-Agency | MSRs
Schedule of Mortgage Servicing Rights [Line Items]
UPB of Underlying Mortgages	$ 69,089,498	$ 70,022,636
Weighted Average Life (Years)	5 years 4 months 24 days	5 years 4 months 24 days
Carrying Value	$ 830,163	$ 836,408
Ginnie Mae | MSRs
Schedule of Mortgage Servicing Rights [Line Items]
UPB of Underlying Mortgages	$ 139,936,290	$ 137,177,395
Weighted Average Life (Years)	6 years 3 months 18 days	6 years 4 months 24 days
Carrying Value	$ 3,107,639	$ 3,072,064