FAIR VALUE MEASUREMENTS - Information Regarding Inputs used in Valuing Excess MSRs Owned Directly and through Equity Method Investees (Details)	12 Months Ended
	Dec. 31, 2024 $ / Loan	Dec. 31, 2023 $ / Loan
Prepayment Rate | MSRs And MSR Financing Receivables | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.068	0.086
Prepayment Rate | MSRs And MSR Financing Receivables | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.018	0.003
Prepayment Rate | MSRs And MSR Financing Receivables | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	1.000	0.837
Prepayment Rate | MSRs And MSR Financing Receivables | GSE | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.060	0.073
Prepayment Rate | MSRs And MSR Financing Receivables | GSE | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.025	0.006
Prepayment Rate | MSRs And MSR Financing Receivables | GSE | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.994	0.837
Prepayment Rate | MSRs And MSR Financing Receivables | non-Agency | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.084	0.122
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	0.003
Prepayment Rate | MSRs And MSR Financing Receivables | non-Agency | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	1.000	0.834
Prepayment Rate | MSRs And MSR Financing Receivables | Ginnie Mae | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.080	0.105
Prepayment Rate | MSRs And MSR Financing Receivables | Ginnie Mae | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.021	0.050
Prepayment Rate | MSRs And MSR Financing Receivables | Ginnie Mae | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.785	0.819
Prepayment Rate | Directly Held | Excess MSRs | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.066	0.065
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 | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.133	0.122
Prepayment Rate | Held through Equity Method Investees | Excess MSRs | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input		0.078
Prepayment Rate | Held through Equity Method Investees | Excess MSRs | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input		0.063
Prepayment Rate | Held through Equity Method Investees | Excess MSRs | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input		0.09
Delinquency | MSRs And MSR Financing Receivables | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.062	0.061
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 | 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 | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.019	0.023
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 | 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 | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.248	0.232
Delinquency | MSRs And MSR Financing Receivables | non-Agency | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.000	0.009
Delinquency | MSRs And MSR Financing Receivables | non-Agency | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	1.000	0.833
Delinquency | MSRs And MSR Financing Receivables | Ginnie Mae | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.100	0.097
Delinquency | MSRs And MSR Financing Receivables | Ginnie Mae | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.000	0.003
Delinquency | MSRs And MSR Financing Receivables | Ginnie Mae | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	1.000	0.800
Delinquency | Directly Held | Excess MSRs | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.051	0.043
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 | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.147	0.088
Delinquency | Held through Equity Method Investees | Excess MSRs | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input		0.035
Delinquency | Held through Equity Method Investees | Excess MSRs | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input		0.022
Delinquency | Held through Equity Method Investees | Excess MSRs | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input		0.056
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 | 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 | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.261	0.304
Recapture Rate | MSRs And MSR Financing Receivables | GSE | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.141	0.159
Recapture Rate | MSRs And MSR Financing Receivables | GSE | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.076	0.078
Recapture Rate | MSRs And MSR Financing Receivables | GSE | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.219	0.273
Recapture Rate | MSRs And MSR Financing Receivables | non-Agency | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.016	0.004
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 | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.158	0.279
Recapture Rate | MSRs And MSR Financing Receivables | Ginnie Mae | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.218	0.203
Recapture Rate | MSRs And MSR Financing Receivables | Ginnie Mae | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.080	0.093
Recapture Rate | MSRs And MSR Financing Receivables | Ginnie Mae | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.261	0.304
Recapture Rate | Directly Held | Excess MSRs | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.396	0.552
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 | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	0.642	0.911
Recapture Rate | Held through Equity Method Investees | Excess MSRs | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input		0.59
Recapture Rate | Held through Equity Method Investees | Excess MSRs | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input		0.451
Recapture Rate | Held through Equity Method Investees | Excess MSRs | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input		0.643
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	0.0033
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	0.0003
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	0.0159	0.0242
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	0.0027
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	0.0002	0.0006
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	0.0159	0.0104
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	0.0045	0.0046
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	0.0003
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	0.0156	0.0242
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	0.0046	0.0043
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	0.0019
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	0.0154	0.0082
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	0.0020
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	0.0001
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	0.0055
Mortgage Servicing Amount or Excess Mortgage Servicing Amount (bps) | Held through Equity Method Investees | Excess MSRs | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input		0.0021
Mortgage Servicing Amount or Excess Mortgage Servicing Amount (bps) | Held through Equity Method Investees | Excess MSRs | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input		0.0016
Mortgage Servicing Amount or Excess Mortgage Servicing Amount (bps) | Held through Equity Method Investees | Excess MSRs | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input		0.0025
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 | 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 | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral Weighted Average Maturity (Years)	58 years	40 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 | 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 | 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 | 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 | 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 | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral Weighted Average Maturity (Years)	58 years	40 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	27 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 | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral Weighted Average Maturity (Years)	42 years	39 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	20 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)	11 years	11 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	27 years
Collateral Weighted Average Maturity (Years) | Held through Equity Method Investees | Excess MSRs | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral Weighted Average Maturity (Years)		18 years
Collateral Weighted Average Maturity (Years) | Held through Equity Method Investees | Excess MSRs | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral Weighted Average Maturity (Years)		14 years
Collateral Weighted Average Maturity (Years) | Held through Equity Method Investees | Excess MSRs | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral Weighted Average Maturity (Years)		21 years
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	9.60	9.16
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	8.45	7.50
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	11.55	9.57
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	8.25	8.37
Measurement Input, Servicing Cost | MSRs And MSR Financing Receivables | Agency | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	6.89	6.99
Measurement Input, Servicing Cost | MSRs And MSR Financing Receivables | Agency | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	6.87	6.38
Measurement Input, Servicing Cost | MSRs And MSR Financing Receivables | Agency | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing asset, measurement input	6.96	7.08