FAIR VALUE MEASUREMENTS - Inputs Used in Valuing Investments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value and Carrying Value	$ 91,814	$ 115,483
Performing | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value and Carrying Value	72,595	113,196
Non-performing | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value and Carrying Value	$ 19,219	$ 2,287
Discount Rate | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.086	0.068
Discount Rate | Performing | Minimum | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.053	0.038
Discount Rate | Performing | Maximum | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.087	0.070
Discount Rate | Performing | Weighted Average | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.085	0.068
Discount Rate | Non-performing | Minimum | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.087	0.075
Discount Rate | Non-performing | Maximum | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.091	0.075
Discount Rate | Non-performing | Weighted Average | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.089	0.075
Prepayment Rate | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.126	0.059
Prepayment Rate | Performing | Minimum | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.093	0.048
Prepayment Rate | Performing | Maximum | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.114	0.074
Prepayment Rate | Performing | Weighted Average | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.094	0.060
Prepayment Rate | Non-performing | Minimum | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.163	0.017
Prepayment Rate | Non-performing | Maximum | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.311	0.017
Prepayment Rate | Non-performing | Weighted Average | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.246	0.017
CDR | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.080	0.061
CDR | Performing | Minimum | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.043	0.009
CDR | Performing | Maximum | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.083	0.094
CDR | Performing | Weighted Average | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.045	0.059
CDR | Non-performing | Minimum | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.137	0.167
CDR | Non-performing | Maximum | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.275	0.167
CDR | Non-performing | Weighted Average | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.215	0.167
Loss Severity | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.272	0.454
Loss Severity | Performing | Minimum | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.200	0.409
Loss Severity | Performing | Maximum | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.371	0.547
Loss Severity | Performing | Weighted Average | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.239	0.455
Loss Severity | Non-performing | Minimum | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.395	0.419
Loss Severity | Non-performing | Maximum | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.398	0.419
Loss Severity | Non-performing | Weighted Average | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, measurement input	0.396	0.419
Weighted Average Life (Years) | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, term	4 years 8 months 12 days	4 years 10 months 24 days
Weighted Average Life (Years) | Performing | Minimum | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, term	5 years	4 years 9 months 18 days
Weighted Average Life (Years) | Performing | Maximum | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, term	7 years 2 months 12 days	8 years 9 months 18 days
Weighted Average Life (Years) | Performing | Weighted Average | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, term	5 years 2 months 12 days	4 years 10 months 24 days
Weighted Average Life (Years) | Non-performing | Minimum | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, term	2 years 2 months 12 days	4 years 8 months 12 days
Weighted Average Life (Years) | Non-performing | Maximum | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, term	3 years 9 months 18 days	4 years 8 months 12 days
Weighted Average Life (Years) | Non-performing | Weighted Average | Nonrecurring | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing receivable, term	2 years 10 months 24 days	4 years 8 months 12 days
Residential mortgage loans held-for-sale, at fair value | Performing
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, fair value	$ 236,452
Residential mortgage loans held-for-sale, at fair value | Non-performing
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, fair value	24,925
Residential mortgage loans held-for-investment, at fair value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, fair value	$ 452,519
Residential mortgage loans held-for-investment, at fair value | Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.038
Residential mortgage loans held-for-investment, at fair value | Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.087
Residential mortgage loans held-for-investment, at fair value | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.085
Residential mortgage loans held-for-investment, at fair value | Prepayment Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.093
Residential mortgage loans held-for-investment, at fair value | Prepayment Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.163
Residential mortgage loans held-for-investment, at fair value | Prepayment Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.123
Residential mortgage loans held-for-investment, at fair value | CDR | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.001
Residential mortgage loans held-for-investment, at fair value | CDR | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.137
Residential mortgage loans held-for-investment, at fair value | CDR | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.067
Residential mortgage loans held-for-investment, at fair value | Loss Severity | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.232
Residential mortgage loans held-for-investment, at fair value | Loss Severity | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.550
Residential mortgage loans held-for-investment, at fair value | Loss Severity | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans, held-for-investment, measurement input	0.403
Consumer loans held-for-investment, at fair value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans	$ 363,756
Consumer loans held-for-investment, at fair value | Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.083
Consumer loans held-for-investment, at fair value | Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.093
Consumer loans held-for-investment, at fair value | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.086
Consumer loans held-for-investment, at fair value | Prepayment Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.068
Consumer loans held-for-investment, at fair value | Prepayment Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.332
Consumer loans held-for-investment, at fair value | Prepayment Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.287
Consumer loans held-for-investment, at fair value | CDR | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.000
Consumer loans held-for-investment, at fair value | CDR | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.071
Consumer loans held-for-investment, at fair value | CDR | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.043
Consumer loans held-for-investment, at fair value | Loss Severity | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.568
Consumer loans held-for-investment, at fair value | Loss Severity | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.568
Consumer loans held-for-investment, at fair value | Loss Severity | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Consumer loans, held-for-investment, measurement input	0.568
Interest rate lock commitments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative, fair value	$ 8,786
Interest rate lock commitments | Loan Funding Probability | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative, measurement input	0.000
Interest rate lock commitments | Loan Funding Probability | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative, measurement input	1.000
Interest rate lock commitments | Loan Funding Probability | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative, measurement input	0.825
Interest rate lock commitments | Fair Value of initial servicing rights | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative, measurement input	(0.01502)
Interest rate lock commitments | Fair Value of initial servicing rights | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative, measurement input	0.03246
Interest rate lock commitments | Fair Value of initial servicing rights | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative, measurement input	0.01856
Asset-Backed Securities Issued
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset-backed securities, fair value	$ 319,486
Asset-Backed Securities Issued | Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset-backed securities, measurement input	0.033
Asset-Backed Securities Issued | Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset-backed securities, measurement input	0.063
Asset-Backed Securities Issued | Discount Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset-backed securities, measurement input	0.061
Asset-Backed Securities Issued | Prepayment Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset-backed securities, measurement input	0.137
Asset-Backed Securities Issued | Prepayment Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset-backed securities, measurement input	0.218
Asset-Backed Securities Issued | Prepayment Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset-backed securities, measurement input	0.213
Asset-Backed Securities Issued | CDR | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset-backed securities, measurement input	0.001
Asset-Backed Securities Issued | CDR | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset-backed securities, measurement input	0.042
Asset-Backed Securities Issued | CDR | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset-backed securities, measurement input	0.039
Asset-Backed Securities Issued | Loss Severity | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset-backed securities, measurement input	0.440
Asset-Backed Securities Issued | Loss Severity | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset-backed securities, measurement input	0.947
Asset-Backed Securities Issued | Loss Severity | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset-backed securities, measurement input	0.916
Acquired | Residential mortgage loans held-for-sale, at fair value | Performing
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, fair value	$ 52,467
Acquired | Residential mortgage loans held-for-sale, at fair value | Non-performing
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, fair value	$ 20,759
Acquired | Residential mortgage loans held-for-sale, at fair value | Discount Rate | Performing | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.085
Acquired | Residential mortgage loans held-for-sale, at fair value | Discount Rate | Performing | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.087
Acquired | Residential mortgage loans held-for-sale, at fair value | Discount Rate | Performing | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.085
Acquired | Residential mortgage loans held-for-sale, at fair value | Discount Rate | Non-performing | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input		0.087
Acquired | Residential mortgage loans held-for-sale, at fair value | Discount Rate | Non-performing | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input		0.559
Acquired | Residential mortgage loans held-for-sale, at fair value | Discount Rate | Non-performing | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input		0.090
Acquired | Residential mortgage loans held-for-sale, at fair value | Prepayment Rate | Performing | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.093
Acquired | Residential mortgage loans held-for-sale, at fair value | Prepayment Rate | Performing | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.114
Acquired | Residential mortgage loans held-for-sale, at fair value | Prepayment Rate | Performing | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.097
Acquired | Residential mortgage loans held-for-sale, at fair value | CDR | Performing | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.043
Acquired | Residential mortgage loans held-for-sale, at fair value | CDR | Performing | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.083
Acquired | Residential mortgage loans held-for-sale, at fair value | CDR | Performing | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.050
Acquired | Residential mortgage loans held-for-sale, at fair value | Loss Severity | Performing | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.200
Acquired | Residential mortgage loans held-for-sale, at fair value | Loss Severity | Performing | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.371
Acquired | Residential mortgage loans held-for-sale, at fair value | Loss Severity | Performing | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input	0.241
Acquired | Residential mortgage loans held-for-sale, at fair value | Annual change in home prices | Non-performing | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input		0.332
Acquired | Residential mortgage loans held-for-sale, at fair value | Annual change in home prices | Non-performing | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input		0.559
Acquired | Residential mortgage loans held-for-sale, at fair value | Annual change in home prices | Non-performing | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input		0.407
Acquired | Residential mortgage loans held-for-sale, at fair value | Liquidation Timeline (in years) | Non-performing | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input		2.2
Acquired | Residential mortgage loans held-for-sale, at fair value | Liquidation Timeline (in years) | Non-performing | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input		3.8
Acquired | Residential mortgage loans held-for-sale, at fair value | Liquidation Timeline (in years) | Non-performing | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input		2.8
Acquired | Residential mortgage loans held-for-sale, at fair value | Current Value of Underlying Properties | Non-performing | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input		1.916
Acquired | Residential mortgage loans held-for-sale, at fair value | Current Value of Underlying Properties | Non-performing | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input		2.606
Acquired | Residential mortgage loans held-for-sale, at fair value | Current Value of Underlying Properties | Non-performing | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, measurement input		2.145
Originated | Residential mortgage loans held-for-sale, at fair value | Performing
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, fair value	$ 183,985
Originated | Residential mortgage loans held-for-sale, at fair value | Non-performing
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-sale, fair value	$ 4,166