MORTGAGE SERVICING RIGHTS AND MSR FINANCING RECEIVABLES - Schedule of Investment in MSRs (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Dec. 31, 2022
Servicing Asset at Amortized Cost [Line Items]
Weighted Average Life (Years)		1 year 1 month 6 days
Carrying Value		$ 8,886,209	$ 8,889,403
Residential mortgage loan repurchase liability	[1]	1,189,907	$ 1,219,890
Mortgage Servicing Rights and Mortgage Servicing Rights Financing Receivable
Servicing Asset at Amortized Cost [Line Items]
UPB of Underlying Residential Mortgage Loans		$ 535,865,895
Weighted Average Life (Years)		7 years 2 months 12 days
Carrying Value		$ 8,886,209
MSRs | Weighted Average
Servicing Asset at Amortized Cost [Line Items]
Discount rate		8.40%
MSRs | Minimum
Servicing Asset at Amortized Cost [Line Items]
Discount rate		7.60%
MSRs | Maximum
Servicing Asset at Amortized Cost [Line Items]
Discount rate		10.80%
Agency | MSRs
Servicing Asset at Amortized Cost [Line Items]
UPB of Underlying Residential Mortgage Loans		$ 360,605,371
Weighted Average Life (Years)		7 years 4 months 24 days
Carrying Value		$ 5,996,278
Non-Agency | MSRs
Servicing Asset at Amortized Cost [Line Items]
UPB of Underlying Residential Mortgage Loans		$ 52,614,283
Weighted Average Life (Years)		6 years 4 months 24 days
Carrying Value		$ 748,723
Ginnie Mae | MSRs
Servicing Asset at Amortized Cost [Line Items]
UPB of Underlying Residential Mortgage Loans		$ 122,646,241
Weighted Average Life (Years)		7 years 1 month 6 days
Carrying Value		$ 2,141,208

[1] See Note 5 for details.