SERVICER ADVANCE INVESTMENTS - Summary of Investments in Servicer Advances - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Investments in and Advances to Affiliates [Line Items]
Outstanding Servicer Advances	$ 376,881	$ 398,820
Face Amount of Secured Notes and Bonds Payable	26,412,410
Servicer Advance Investments | Servicer advance investments
Investments in and Advances to Affiliates [Line Items]
Residential mortgage loan UPB and other collateral	15,499,559	17,033,753
Outstanding Servicer Advances	$ 320,630	$ 341,628
Servicer Advances to UPB of Underlying Residential Mortgage Loans	2.10%	2.00%
Face Amount of Secured Notes and Bonds Payable	$ 278,845	$ 319,276
Gross Loan-to-Value	84.10%	90.20%
Net Loan-to-Value	81.90%	88.30%
Gross Cost of Funds	7.50%	6.50%
Net Cost of Funds	6.90%	5.90%