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FAIR VALUE MEASUREMENTS - Information Regarding the Inputs used in Valuing the Servicer Advances (Details) - Servicer Advances
3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value inputs, monthly servicing fee 0.027% 0.038%
Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Outstanding Servicer Advances to UPB of Underlying Residential Mortgage Loans 2.30% 2.10%
Minimum | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.047 0.046
Minimum | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.192 0.196
Minimum | Mortgage Servicing Amount    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.00199 0.00199
Minimum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.065 0.065
Weighted Average | Collateral Weighted Average Maturity (Years)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral Weighted Average Maturity (Years) 20 years 10 months 24 days 21 years 1 month 6 days