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FAIR VALUE MEASUREMENTS - Information Regarding Inputs used in Valuing Excess MSRs Owned Directly and through Equity Method Investees (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2025
$ / Loan
Dec. 31, 2024
$ / Loan
Prepayment Rate | MSRs And MSR Financing Receivables | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.017 0.018
Prepayment Rate | MSRs And MSR Financing Receivables | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.074 0.068
Prepayment Rate | MSRs And MSR Financing Receivables | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.954 1.000
Prepayment Rate | MSRs And MSR Financing Receivables | GSE | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.028 0.025
Prepayment Rate | MSRs And MSR Financing Receivables | GSE | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.066 0.060
Prepayment Rate | MSRs And MSR Financing Receivables | GSE | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.954 0.994
Prepayment Rate | MSRs And MSR Financing Receivables | Non-Agency | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.018 0.018
Prepayment Rate | MSRs And MSR Financing Receivables | Non-Agency | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.086 0.084
Prepayment Rate | MSRs And MSR Financing Receivables | Non-Agency | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.900 1.000
Prepayment Rate | MSRs And MSR Financing Receivables | Ginnie Mae | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.017 0.021
Prepayment Rate | MSRs And MSR Financing Receivables | Ginnie Mae | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.086 0.080
Prepayment Rate | MSRs And MSR Financing Receivables | Ginnie Mae | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.713 0.785
Prepayment Rate | Directly Held | Excess MSRs | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.024 0.024
Prepayment Rate | Directly Held | Excess MSRs | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.069 0.066
Prepayment Rate | Directly Held | Excess MSRs | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.139 0.133
Delinquency | MSRs And MSR Financing Receivables | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.000 0.000
Delinquency | MSRs And MSR Financing Receivables | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.056 0.062
Delinquency | MSRs And MSR Financing Receivables | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 1.000 1.000
Delinquency | MSRs And MSR Financing Receivables | GSE | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.000 0.000
Delinquency | MSRs And MSR Financing Receivables | GSE | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.017 0.019
Delinquency | MSRs And MSR Financing Receivables | GSE | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 1.000 1.000
Delinquency | MSRs And MSR Financing Receivables | Non-Agency | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.000 0.000
Delinquency | MSRs And MSR Financing Receivables | Non-Agency | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.232 0.248
Delinquency | MSRs And MSR Financing Receivables | Non-Agency | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.990 1.000
Delinquency | MSRs And MSR Financing Receivables | Ginnie Mae | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.730 0.000
Delinquency | MSRs And MSR Financing Receivables | Ginnie Mae | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.085 0.100
Delinquency | MSRs And MSR Financing Receivables | Ginnie Mae | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 1.000 1.000
Delinquency | Directly Held | Excess MSRs | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.003 0.002
Delinquency | Directly Held | Excess MSRs | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.051 0.051
Delinquency | Directly Held | Excess MSRs | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.145 0.147
Recapture Rate | MSRs And MSR Financing Receivables | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.000 0.000
Recapture Rate | MSRs And MSR Financing Receivables | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.200 0.200
Recapture Rate | MSRs And MSR Financing Receivables | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.311 0.261
Recapture Rate | MSRs And MSR Financing Receivables | GSE | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.065 0.076
Recapture Rate | MSRs And MSR Financing Receivables | GSE | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.146 0.141
Recapture Rate | MSRs And MSR Financing Receivables | GSE | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.187 0.219
Recapture Rate | MSRs And MSR Financing Receivables | Non-Agency | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.000 0.000
Recapture Rate | MSRs And MSR Financing Receivables | Non-Agency | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.007 0.016
Recapture Rate | MSRs And MSR Financing Receivables | Non-Agency | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.050 0.158
Recapture Rate | MSRs And MSR Financing Receivables | Ginnie Mae | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.133 0.080
Recapture Rate | MSRs And MSR Financing Receivables | Ginnie Mae | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.267 0.218
Recapture Rate | MSRs And MSR Financing Receivables | Ginnie Mae | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.311 0.261
Recapture Rate | Directly Held | Excess MSRs | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.000 0.000
Recapture Rate | Directly Held | Excess MSRs | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.396 0.396
Recapture Rate | Directly Held | Excess MSRs | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.640 0.642
Mortgage Servicing Amount or Excess Mortgage Servicing Amount (bps) | MSRs And MSR Financing Receivables | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.0001 0.0001
Mortgage Servicing Amount or Excess Mortgage Servicing Amount (bps) | MSRs And MSR Financing Receivables | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.0035 0.0035
Mortgage Servicing Amount or Excess Mortgage Servicing Amount (bps) | MSRs And MSR Financing Receivables | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.0192 0.0159
Mortgage Servicing Amount or Excess Mortgage Servicing Amount (bps) | MSRs And MSR Financing Receivables | GSE | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.0011 0.0002
Mortgage Servicing Amount or Excess Mortgage Servicing Amount (bps) | MSRs And MSR Financing Receivables | GSE | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.0028 0.0028
Mortgage Servicing Amount or Excess Mortgage Servicing Amount (bps) | MSRs And MSR Financing Receivables | GSE | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.0157 0.0159
Mortgage Servicing Amount or Excess Mortgage Servicing Amount (bps) | MSRs And MSR Financing Receivables | Non-Agency | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.0001 0.0001
Mortgage Servicing Amount or Excess Mortgage Servicing Amount (bps) | MSRs And MSR Financing Receivables | Non-Agency | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.0044 0.0045
Mortgage Servicing Amount or Excess Mortgage Servicing Amount (bps) | MSRs And MSR Financing Receivables | Non-Agency | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.0192 0.0156
Mortgage Servicing Amount or Excess Mortgage Servicing Amount (bps) | MSRs And MSR Financing Receivables | Ginnie Mae | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.0008 0.0008
Mortgage Servicing Amount or Excess Mortgage Servicing Amount (bps) | MSRs And MSR Financing Receivables | Ginnie Mae | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.0047 0.0046
Mortgage Servicing Amount or Excess Mortgage Servicing Amount (bps) | MSRs And MSR Financing Receivables | Ginnie Mae | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.0119 0.0154
Mortgage Servicing Amount or Excess Mortgage Servicing Amount (bps) | Directly Held | Excess MSRs | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.0007 0.0007
Mortgage Servicing Amount or Excess Mortgage Servicing Amount (bps) | Directly Held | Excess MSRs | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.0021 0.0021
Mortgage Servicing Amount or Excess Mortgage Servicing Amount (bps) | Directly Held | Excess MSRs | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.0032 0.0032
Collateral Weighted Average Maturity (Years) | MSRs And MSR Financing Receivables | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral Weighted Average Maturity (Years) 0 years 0 years
Collateral Weighted Average Maturity (Years) | MSRs And MSR Financing Receivables | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral Weighted Average Maturity (Years) 24 years 24 years
Collateral Weighted Average Maturity (Years) | MSRs And MSR Financing Receivables | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral Weighted Average Maturity (Years) 47 years 58 years
Collateral Weighted Average Maturity (Years) | MSRs And MSR Financing Receivables | GSE | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral Weighted Average Maturity (Years) 0 years 0 years
Collateral Weighted Average Maturity (Years) | MSRs And MSR Financing Receivables | GSE | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral Weighted Average Maturity (Years) 23 years 23 years
Collateral Weighted Average Maturity (Years) | MSRs And MSR Financing Receivables | GSE | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral Weighted Average Maturity (Years) 40 years 40 years
Collateral Weighted Average Maturity (Years) | MSRs And MSR Financing Receivables | Non-Agency | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral Weighted Average Maturity (Years) 0 years 0 years
Collateral Weighted Average Maturity (Years) | MSRs And MSR Financing Receivables | Non-Agency | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral Weighted Average Maturity (Years) 21 years 21 years
Collateral Weighted Average Maturity (Years) | MSRs And MSR Financing Receivables | Non-Agency | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral Weighted Average Maturity (Years) 47 years 58 years
Collateral Weighted Average Maturity (Years) | MSRs And MSR Financing Receivables | Ginnie Mae | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral Weighted Average Maturity (Years) 0 years 0 years
Collateral Weighted Average Maturity (Years) | MSRs And MSR Financing Receivables | Ginnie Mae | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral Weighted Average Maturity (Years) 26 years 26 years
Collateral Weighted Average Maturity (Years) | MSRs And MSR Financing Receivables | Ginnie Mae | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral Weighted Average Maturity (Years) 40 years 42 years
Collateral Weighted Average Maturity (Years) | Directly Held | Excess MSRs | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral Weighted Average Maturity (Years) 10 years 11 years
Collateral Weighted Average Maturity (Years) | Directly Held | Excess MSRs | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral Weighted Average Maturity (Years) 19 years 19 years
Collateral Weighted Average Maturity (Years) | Directly Held | Excess MSRs | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral Weighted Average Maturity (Years) 22 years 22 years
Measurement Input, Servicing Cost | MSRs And MSR Financing Receivables | Non-Agency | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 8.22 8.45
Measurement Input, Servicing Cost | MSRs And MSR Financing Receivables | Non-Agency | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 9.28 9.60
Measurement Input, Servicing Cost | MSRs And MSR Financing Receivables | Non-Agency | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 10.55 11.55
Measurement Input, Servicing Cost | MSRs And MSR Financing Receivables | Ginnie Mae | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 8.20 8.25
Measurement Input, Servicing Cost | MSRs And MSR Financing Receivables | Agency Securities | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 6.86 6.87
Measurement Input, Servicing Cost | MSRs And MSR Financing Receivables | Agency Securities | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 6.88 6.89
Measurement Input, Servicing Cost | MSRs And MSR Financing Receivables | Agency Securities | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 6.94 6.96