FAIR VALUE MEASUREMENTS - Schedule of Information Regarding the Ranges and Weighted Averages of Inputs (Details)	6 Months Ended
	Jun. 30, 2024 $ / Loan
Prepayment Rate | MSRs, MSR Financing Receivables, Excess Spread Financing | Minimum
Directly Held
Servicing asset, measurement input	0.018
Prepayment Rate | MSRs, MSR Financing Receivables, Excess Spread Financing | Maximum
Directly Held
Servicing asset, measurement input	1.000
Prepayment Rate | MSRs, MSR Financing Receivables, Excess Spread Financing | Weighted Average
Directly Held
Servicing asset, measurement input	0.069
Prepayment Rate | Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Minimum
Directly Held
Servicing asset, measurement input	0.025
Prepayment Rate | Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Maximum
Directly Held
Servicing asset, measurement input	0.994
Prepayment Rate | Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Weighted Average
Directly Held
Servicing asset, measurement input	0.058
Prepayment Rate | Non-Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Minimum
Directly Held
Servicing asset, measurement input	0.018
Prepayment Rate | Non-Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Maximum
Directly Held
Servicing asset, measurement input	1.000
Prepayment Rate | Non-Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Weighted Average
Directly Held
Servicing asset, measurement input	0.087
Prepayment Rate | Ginnie Mae | MSRs, MSR Financing Receivables, Excess Spread Financing | Minimum
Directly Held
Servicing asset, measurement input	0.021
Prepayment Rate | Ginnie Mae | MSRs, MSR Financing Receivables, Excess Spread Financing | Maximum
Directly Held
Servicing asset, measurement input	0.785
Prepayment Rate | Ginnie Mae | MSRs, MSR Financing Receivables, Excess Spread Financing | Weighted Average
Directly Held
Servicing asset, measurement input	0.088
Prepayment Rate | Directly Held | Excess MSRs | Minimum
Directly Held
Servicing asset, measurement input	0.024
Prepayment Rate | Directly Held | Excess MSRs | Maximum
Directly Held
Servicing asset, measurement input	0.115
Prepayment Rate | Directly Held | Excess MSRs | Weighted Average
Directly Held
Servicing asset, measurement input	0.069
Delinquency | MSRs, MSR Financing Receivables, Excess Spread Financing | Minimum
Directly Held
Servicing asset, measurement input	0.000
Delinquency | MSRs, MSR Financing Receivables, Excess Spread Financing | Maximum
Directly Held
Servicing asset, measurement input	1.000
Delinquency | MSRs, MSR Financing Receivables, Excess Spread Financing | Weighted Average
Directly Held
Servicing asset, measurement input	0.053
Delinquency | Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Minimum
Directly Held
Servicing asset, measurement input	0.000
Delinquency | Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Maximum
Directly Held
Servicing asset, measurement input	1.000
Delinquency | Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Weighted Average
Directly Held
Servicing asset, measurement input	0.016
Delinquency | Non-Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Minimum
Directly Held
Servicing asset, measurement input	0.000
Delinquency | Non-Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Maximum
Directly Held
Servicing asset, measurement input	1.000
Delinquency | Non-Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Weighted Average
Directly Held
Servicing asset, measurement input	0.241
Delinquency | Ginnie Mae | MSRs, MSR Financing Receivables, Excess Spread Financing | Minimum
Directly Held
Servicing asset, measurement input	0.000
Delinquency | Ginnie Mae | MSRs, MSR Financing Receivables, Excess Spread Financing | Maximum
Directly Held
Servicing asset, measurement input	1.000
Delinquency | Ginnie Mae | MSRs, MSR Financing Receivables, Excess Spread Financing | Weighted Average
Directly Held
Servicing asset, measurement input	0.077
Delinquency | Directly Held | Excess MSRs | Minimum
Directly Held
Servicing asset, measurement input	0.003
Delinquency | Directly Held | Excess MSRs | Maximum
Directly Held
Servicing asset, measurement input	0.150
Delinquency | Directly Held | Excess MSRs | Weighted Average
Directly Held
Servicing asset, measurement input	0.050
Recapture Rate | Directly Held | Excess MSRs | Minimum
Directly Held
Servicing asset, measurement input	0.000
Recapture Rate | Directly Held | Excess MSRs | Maximum
Directly Held
Servicing asset, measurement input	0.916
Recapture Rate | Directly Held | Excess MSRs | Weighted Average
Directly Held
Servicing asset, measurement input	0.564
Mortgage Servicing Amount | MSRs, MSR Financing Receivables, Excess Spread Financing | Minimum
Directly Held
Servicing asset, measurement input	0.0001
Mortgage Servicing Amount | MSRs, MSR Financing Receivables, Excess Spread Financing | Maximum
Directly Held
Servicing asset, measurement input	0.0159
Mortgage Servicing Amount | MSRs, MSR Financing Receivables, Excess Spread Financing | Weighted Average
Directly Held
Servicing asset, measurement input	0.0034
Mortgage Servicing Amount | Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Minimum
Directly Held
Servicing asset, measurement input	0.0002
Mortgage Servicing Amount | Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Maximum
Directly Held
Servicing asset, measurement input	0.0159
Mortgage Servicing Amount | Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Weighted Average
Directly Held
Servicing asset, measurement input	0.0027
Mortgage Servicing Amount | Non-Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Minimum
Directly Held
Servicing asset, measurement input	0.0001
Mortgage Servicing Amount | Non-Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Maximum
Directly Held
Servicing asset, measurement input	0.0156
Mortgage Servicing Amount | Non-Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Weighted Average
Directly Held
Servicing asset, measurement input	0.0044
Mortgage Servicing Amount | Ginnie Mae | MSRs, MSR Financing Receivables, Excess Spread Financing | Minimum
Directly Held
Servicing asset, measurement input	0.0008
Mortgage Servicing Amount | Ginnie Mae | MSRs, MSR Financing Receivables, Excess Spread Financing | Maximum
Directly Held
Servicing asset, measurement input	0.0154
Mortgage Servicing Amount | Ginnie Mae | MSRs, MSR Financing Receivables, Excess Spread Financing | Weighted Average
Directly Held
Servicing asset, measurement input	0.0045
Mortgage Servicing Amount | Directly Held | Excess MSRs | Minimum
Directly Held
Servicing asset, measurement input	0.0007
Mortgage Servicing Amount | Directly Held | Excess MSRs | Maximum
Directly Held
Servicing asset, measurement input	0.0032
Mortgage Servicing Amount | Directly Held | Excess MSRs | Weighted Average
Directly Held
Servicing asset, measurement input	0.0021
Collateral Weighted Average Maturity (Years) | MSRs, MSR Financing Receivables, Excess Spread Financing | Minimum
Directly Held
Collateral weighted average maturity (years)	0 years
Collateral Weighted Average Maturity (Years) | MSRs, MSR Financing Receivables, Excess Spread Financing | Maximum
Directly Held
Collateral weighted average maturity (years)	58 years
Collateral Weighted Average Maturity (Years) | MSRs, MSR Financing Receivables, Excess Spread Financing | Weighted Average
Directly Held
Collateral weighted average maturity (years)	24 years
Collateral Weighted Average Maturity (Years) | Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Minimum
Directly Held
Collateral weighted average maturity (years)	0 years
Collateral Weighted Average Maturity (Years) | Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Maximum
Directly Held
Collateral weighted average maturity (years)	40 years
Collateral Weighted Average Maturity (Years) | Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Weighted Average
Directly Held
Collateral weighted average maturity (years)	23 years
Collateral Weighted Average Maturity (Years) | Non-Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Minimum
Directly Held
Collateral weighted average maturity (years)	0 years
Collateral Weighted Average Maturity (Years) | Non-Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Maximum
Directly Held
Collateral weighted average maturity (years)	58 years
Collateral Weighted Average Maturity (Years) | Non-Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Weighted Average
Directly Held
Collateral weighted average maturity (years)	22 years
Collateral Weighted Average Maturity (Years) | Ginnie Mae | MSRs, MSR Financing Receivables, Excess Spread Financing | Minimum
Directly Held
Collateral weighted average maturity (years)	0 years
Collateral Weighted Average Maturity (Years) | Ginnie Mae | MSRs, MSR Financing Receivables, Excess Spread Financing | Maximum
Directly Held
Collateral weighted average maturity (years)	42 years
Collateral Weighted Average Maturity (Years) | Ginnie Mae | MSRs, MSR Financing Receivables, Excess Spread Financing | Weighted Average
Directly Held
Collateral weighted average maturity (years)	27 years
Collateral Weighted Average Maturity (Years) | Directly Held | Excess MSRs | Minimum
Directly Held
Collateral weighted average maturity (years)	11 years
Collateral Weighted Average Maturity (Years) | Directly Held | Excess MSRs | Maximum
Directly Held
Collateral weighted average maturity (years)	28 years
Collateral Weighted Average Maturity (Years) | Directly Held | Excess MSRs | Weighted Average
Directly Held
Collateral weighted average maturity (years)	19 years
Measurement Input, Servicing Cost | Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Minimum
Directly Held
Servicing asset, measurement input	6.86
Measurement Input, Servicing Cost | Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Maximum
Directly Held
Servicing asset, measurement input	6.97
Measurement Input, Servicing Cost | Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Weighted Average
Directly Held
Servicing asset, measurement input	6.89
Measurement Input, Servicing Cost | Non-Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Minimum
Directly Held
Servicing asset, measurement input	8.54
Measurement Input, Servicing Cost | Non-Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Maximum
Directly Held
Servicing asset, measurement input	10.72
Measurement Input, Servicing Cost | Non-Agency | MSRs, MSR Financing Receivables, Excess Spread Financing | Weighted Average
Directly Held
Servicing asset, measurement input	9.42
Measurement Input, Servicing Cost | Ginnie Mae | MSRs, MSR Financing Receivables, Excess Spread Financing | Weighted Average
Directly Held
Servicing asset, measurement input	8.20