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FAIR VALUE MEASUREMENTS - Schedule of Servicer Advance Investments Valuation (Details)
9 Months Ended
Sep. 30, 2024
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Fair value inputs, monthly servicing fee 0.03%
Servicer Advances  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Outstanding Servicer Advances to UPB of Underlying Residential Mortgage Loans 2.40%
Servicer Advances | Prepayment Rate  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Servicing asset, measurement input 0.050
Servicer Advances | Delinquency  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Servicing asset, measurement input 0.197
Servicer Advances | Mortgage Servicing Amount  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Servicing asset, measurement input 0.00199
Servicer Advances | Discount Rate  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Servicing asset, measurement input 0.062
Servicer Advances | Collateral Weighted Average Maturity (Years)  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Collateral weighted average maturity (years) 21 years 2 months 12 days