FAIR VALUE MEASUREMENTS - Information Regarding Inputs used in Valuing Excess MSRs Owned Directly and through Equity Method Investees (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 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	0.015	0.018
Prepayment Rate | MSRs And MSR Financing Receivables | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.071	0.068
Prepayment Rate | MSRs And MSR Financing Receivables | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.999	1.000
Prepayment Rate | MSRs And MSR Financing Receivables | GSE | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.022	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	0.062	0.060
Prepayment Rate | MSRs And MSR Financing Receivables | GSE | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.999	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	0.017	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	0.078	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	0.999	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	0.015	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	0.087	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	0.843	0.785
Prepayment Rate | Directly Held | Excess MSRs | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.023	0.024
Prepayment Rate | Directly Held | Excess MSRs | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.065	0.066
Prepayment Rate | Directly Held | Excess MSRs | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.132	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	0.018	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	0.040	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	0.230	0.248
Delinquency | MSRs And MSR Financing Receivables | Non-Agency | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	1.000	1.000
Delinquency | MSRs And MSR Financing Receivables | Ginnie Mae | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.630	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	0.088	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	0.002	0.002
Delinquency | Directly Held | Excess MSRs | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.047	0.051
Delinquency | Directly Held | Excess MSRs | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.140	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	0.313	0.261
Recapture Rate | MSRs And MSR Financing Receivables | GSE | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.073	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	0.142	0.141
Recapture Rate | MSRs And MSR Financing Receivables | GSE | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.183	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	0.038	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	0.270	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	0.313	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
Recapture Rate | Directly Held | Excess MSRs | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.397	0.396
Recapture Rate | Directly Held | Excess MSRs | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.641	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	0.0036	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	0.0194	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	0.0003	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	0.0029	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	0.0194	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	0.0014	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	0.0132	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	0.0031	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)	60 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)	60 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	9.12	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	11.50	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	14.28	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	10.00	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	7.14	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	7.26	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	7.44	6.96