FAIR VALUE MEASUREMENTS - Schedule of Inputs Used In Valuing Residential Mortgage Loans, Consumer Loans, Mortgage Loans Receivable, Derivatives, and Mortgage Backed Securities (Details) $ in Thousands	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Residential mortgage loans, HFI, at fair value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, fair value	$ 361,890	$ 379,044
Residential mortgage loans, HFI, at fair value | Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.079	0.079
Residential mortgage loans, HFI, at fair value | Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.093	0.083
Residential mortgage loans, HFI, at fair value | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.084	0.081
Residential mortgage loans, HFI, at fair value | Prepayment Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.054	0.029
Residential mortgage loans, HFI, at fair value | Prepayment Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.082	0.035
Residential mortgage loans, HFI, at fair value | Prepayment Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.080	0.032
Residential mortgage loans, HFI, at fair value | CDR | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.013	0.014
Residential mortgage loans, HFI, at fair value | CDR | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.049	0.059
Residential mortgage loans, HFI, at fair value | CDR | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.033	0.043
Residential mortgage loans, HFI, at fair value | Loss Severity | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.124	0.244
Residential mortgage loans, HFI, at fair value | Loss Severity | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.337	0.574
Residential mortgage loans, HFI, at fair value | Loss Severity | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.264	0.461
Consumer Loans HFI, at Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans	$ 665,565	$ 1,274,005
Consumer Loans HFI, at Fair Value | SpringCastle
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans	219,308	285,632
Consumer Loans HFI, at Fair Value | Marcus
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans	$ 446,257	$ 988,373
Consumer Loans HFI, at Fair Value | Discount Rate | Minimum | SpringCastle
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.092	0.084
Consumer Loans HFI, at Fair Value | Discount Rate | Minimum | Marcus
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.079
Consumer Loans HFI, at Fair Value | Discount Rate | Maximum | SpringCastle
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.102	0.094
Consumer Loans HFI, at Fair Value | Discount Rate | Maximum | Marcus
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.179
Consumer Loans HFI, at Fair Value | Discount Rate | Weighted Average | SpringCastle
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.094	0.086
Consumer Loans HFI, at Fair Value | Discount Rate | Weighted Average | Marcus
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.101	0.095
Consumer Loans HFI, at Fair Value | Prepayment Rate | Minimum | SpringCastle
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.129	0.097
Consumer Loans HFI, at Fair Value | Prepayment Rate | Minimum | Marcus
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.000
Consumer Loans HFI, at Fair Value | Prepayment Rate | Maximum | SpringCastle
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.384	0.373
Consumer Loans HFI, at Fair Value | Prepayment Rate | Maximum | Marcus
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.231
Consumer Loans HFI, at Fair Value | Prepayment Rate | Weighted Average | SpringCastle
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.145	0.170
Consumer Loans HFI, at Fair Value | Prepayment Rate | Weighted Average | Marcus
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.178	0.225
Consumer Loans HFI, at Fair Value | CDR | Minimum | SpringCastle
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.023	0.017
Consumer Loans HFI, at Fair Value | CDR | Minimum | Marcus
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.040
Consumer Loans HFI, at Fair Value | CDR | Maximum | SpringCastle
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.171	0.071
Consumer Loans HFI, at Fair Value | CDR | Maximum | Marcus
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.500
Consumer Loans HFI, at Fair Value | CDR | Weighted Average | SpringCastle
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.051	0.048
Consumer Loans HFI, at Fair Value | CDR | Weighted Average | Marcus
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.143	0.062
Consumer Loans HFI, at Fair Value | Loss Severity | Minimum | SpringCastle
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.742	0.825
Consumer Loans HFI, at Fair Value | Loss Severity | Maximum | SpringCastle
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	1.000	1.000
Consumer Loans HFI, at Fair Value | Loss Severity | Weighted Average | SpringCastle
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.923	0.933
Consumer Loans HFI, at Fair Value | Loss Severity | Weighted Average | Marcus
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.875	0.930
IRLCs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative, fair value	$ 11,294	$ 23,804
IRLCs | Loan Funding Probability | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative, measurement input	0.000	0.000
IRLCs | Loan Funding Probability | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative, measurement input	1.000	1.000
IRLCs | Loan Funding Probability | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative, measurement input	0.861	0.808
IRLCs | Fair Value of Initial Servicing Rights (bps) | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative, measurement input	0.00010	0.00070
IRLCs | Fair Value of Initial Servicing Rights (bps) | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative, measurement input	0.04267	0.03313
IRLCs | Fair Value of Initial Servicing Rights (bps) | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative, measurement input	0.02818	0.02105
Asset-Backed Securities Issued
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset-backed securities, fair value	$ 185,460	$ 235,770
Asset-Backed Securities Issued | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset-backed securities, measurement input	0.054	0.060
Asset-Backed Securities Issued | Prepayment Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset-backed securities, measurement input	0.145	0.170
Asset-Backed Securities Issued | CDR | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset-backed securities, measurement input	0.051	0.048
Asset-Backed Securities Issued | Loss Severity | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset-backed securities, measurement input	0.923	0.933
Acquired loans | Residential Transitional Lending
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans, held For investment, fair value		$ 114,366
Acquired loans | Residential Transitional Lending | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans, held-for-investment, measurement input		0.110
Acquired loans | Residential Transitional Lending | Prepayment Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans, held-for-investment, measurement input		0.000
Acquired loans | Residential Transitional Lending | CDR | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans, held-for-investment, measurement input		0.018
Acquired loans | Residential Transitional Lending | CDR | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans, held-for-investment, measurement input		0.025
Acquired loans | Residential Transitional Lending | CDR | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans, held-for-investment, measurement input		0.022
Acquired loans | Residential Transitional Lending | Loss Severity | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans, held-for-investment, measurement input		0.250
Originated loans | Residential Mortgage Loans HFS, at Fair Value | Dealer price quotes and historical sale transactions | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input		0.507
Originated loans | Residential Mortgage Loans HFS, at Fair Value | Dealer price quotes and historical sale transactions | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input		1.000
Originated loans | Residential Mortgage Loans HFS, at Fair Value | Dealer price quotes and historical sale transactions | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input		0.857
Performing Financial Instruments | Residential Mortgage Loans HFS, at Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, fair value		$ 78,794
Performing Financial Instruments | Residential Transitional Lending
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans, held For investment, fair value	$ 2,128,801
Performing Financial Instruments | Residential Transitional Lending | Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans, held-for-investment, measurement input	0.083
Performing Financial Instruments | Residential Transitional Lending | Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans, held-for-investment, measurement input	0.099
Performing Financial Instruments | Residential Transitional Lending | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans, held-for-investment, measurement input	0.083
Performing Financial Instruments | Residential Transitional Lending | Prepayment Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans, held-for-investment, measurement input	0.000
Performing Financial Instruments | Residential Transitional Lending | Prepayment Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans, held-for-investment, measurement input	0.500
Performing Financial Instruments | Residential Transitional Lending | Prepayment Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans, held-for-investment, measurement input	0.458
Performing Financial Instruments | Residential Transitional Lending | CDR | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans, held-for-investment, measurement input	0.005
Performing Financial Instruments | Residential Transitional Lending | CDR | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans, held-for-investment, measurement input	0.018
Performing Financial Instruments | Residential Transitional Lending | CDR | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans, held-for-investment, measurement input	0.005
Performing Financial Instruments | Residential Transitional Lending | Loss Severity | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans, held-for-investment, measurement input	0.250
Performing Financial Instruments | Acquired loans | Residential Mortgage Loans HFS, at Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, fair value	$ 17,700	$ 45,545
Performing Financial Instruments | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.070	0.079
Performing Financial Instruments | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.086	0.083
Performing Financial Instruments | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.079	0.082
Performing Financial Instruments | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | Prepayment Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.060	0.020
Performing Financial Instruments | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | Prepayment Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.082	0.098
Performing Financial Instruments | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | Prepayment Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.079	0.059
Performing Financial Instruments | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | CDR | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.018	0.013
Performing Financial Instruments | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | CDR | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.050	0.059
Performing Financial Instruments | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | CDR | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.031	0.023
Performing Financial Instruments | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | Loss Severity | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.206	0.126
Performing Financial Instruments | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | Loss Severity | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.337	0.574
Performing Financial Instruments | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | Loss Severity | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.240	0.290
Performing Financial Instruments | Originated loans | Residential Mortgage Loans HFS, at Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, fair value		$ 33,249
Loans held-for-sale, measurement input		0.555
Performing Financial Instruments | Originated loans | Residential Mortgage Loans HFS, at Fair Value | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input		0.073
Performing Financial Instruments | Originated loans | Residential Mortgage Loans HFS, at Fair Value | Prepayment Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input		0.089
Performing Financial Instruments | Originated loans | Residential Mortgage Loans HFS, at Fair Value | CDR | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input		0.036
Performing Financial Instruments | Originated loans | Residential Mortgage Loans HFS, at Fair Value | Loss Severity | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input		0.207
Non-performing loans | Residential Mortgage Loans HFS, at Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, fair value		$ 25,993
Non-performing loans | Residential Transitional Lending
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans, held For investment, fair value	$ 55,200
Non-performing loans | Acquired loans | Residential Mortgage Loans HFS, at Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, fair value	$ 9,466	$ 18,944
Non-performing loans | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.085	0.077
Non-performing loans | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.093	0.082
Non-performing loans | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.088	0.081
Non-performing loans | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | CDR | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.013
Non-performing loans | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | CDR | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.051
Non-performing loans | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | CDR | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.038
Non-performing loans | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | Annual Change in Home Prices | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.086	0.035
Non-performing loans | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | Annual Change in Home Prices | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.158	0.072
Non-performing loans | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | Annual Change in Home Prices | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.109	0.059
Non-performing loans | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | CDR | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, term		5 years 6 months
Non-performing loans | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | CDR | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, term		11 years
Non-performing loans | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | CDR | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, term		6 years 6 months
Non-performing loans | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | Current Value of Underlying Properties | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	2.649	2.357
Non-performing loans | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | Current Value of Underlying Properties | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	3.103	8.960
Non-performing loans | Acquired loans | Residential Mortgage Loans HFS, at Fair Value | Current Value of Underlying Properties | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	2.795	2.970
Non-performing loans | Originated loans | Residential Mortgage Loans HFS, at Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, fair value		$ 7,049
Loans held-for-sale, measurement input		0.706
Non-performing loans | Originated loans | Residential Mortgage Loans HFS, at Fair Value | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input		0.073
Non-performing loans | Originated loans | Residential Mortgage Loans HFS, at Fair Value | CDR | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, term		7 years 7 months 6 days