MORTGAGE SERVICING RIGHTS AND MSR FINANCING RECEIVABLES - Schedule of Investment in MSRs (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2023	Dec. 31, 2022
Servicing Asset at Amortized Cost [Line Items]
Weighted Average Life (Years)		1 year 2 months 12 days
Carrying Value		$ 8,688,556	$ 8,889,403
Residential mortgage loan repurchase liability	[1]	1,296,097	$ 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		$ 532,392,018
Weighted Average Life (Years)		7 years 4 months 24 days
Carrying Value		$ 8,688,556
MSRs | Weighted Average
Servicing Asset at Amortized Cost [Line Items]
Discount rate		8.50%
MSRs | Minimum
Servicing Asset at Amortized Cost [Line Items]
Discount rate		7.80%
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		$ 357,246,649
Weighted Average Life (Years)		7 years 7 months 6 days
Carrying Value		$ 5,703,219
Non-Agency | MSRs
Servicing Asset at Amortized Cost [Line Items]
UPB of Underlying Residential Mortgage Loans		$ 51,345,436
Weighted Average Life (Years)		6 years 8 months 12 days
Carrying Value		$ 722,415
Ginnie Mae | MSRs
Servicing Asset at Amortized Cost [Line Items]
UPB of Underlying Residential Mortgage Loans		$ 123,799,933
Weighted Average Life (Years)		7 years 2 months 12 days
Carrying Value		$ 2,262,922

[1] See Note 5 for details.