SERVICER ADVANCE INVESTMENTS - Summary of Investments in Servicer Advances - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Investments in and Advances to Affiliates [Line Items]
Outstanding Servicer Advances	$ 321,531	$ 339,646
Face Amount of Secured Notes and Bonds Payable	31,157,091
Servicer Advance Investments | Servicer advance investments
Investments in and Advances to Affiliates [Line Items]
UPB of Underlying Residential Mortgage Loans	12,955,658	13,316,828
Outstanding Servicer Advances	$ 283,068	$ 298,945
Servicer Advances to UPB of Underlying Residential Mortgage Loans	2.20%	2.20%
Face Amount of Secured Notes and Bonds Payable	$ 246,438	$ 258,183
Gross Loan-to-Value	84.40%	85.00%
Net Loan-to-Value	82.50%	82.90%
Gross Cost of Funds	6.20%	6.30%
Net Cost of Funds	5.80%	5.90%