FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value Measurement Inputs (Details) - Valuation Technique, Discounted Cash Flow	Mar. 31, 2024	Dec. 31, 2023
Minimum | SBA 7(a) loans receivable, subject to credit risk | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input for loans receivable	0.0783	0.0783
Minimum | SBA 7(a) loans receivable, subject to credit risk | Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input for loans receivable	0.0488	0.0488
Minimum | SBA 7(a) loans receivable, subject to loan-backed notes | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input for loans receivable	0.1000	0.1000
Minimum | SBA 7(a) loans receivable, subject to loan-backed notes | Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input for loans receivable	0.0488	0.0488
Minimum | SBA 7(a) loans receivable, subject to secured borrowings | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input for loans receivable	0.1000	0.1000
Minimum | SBA 7(a) loans receivable, subject to secured borrowings | Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input for loans receivable	0.0500	0.0500
Maximum | SBA 7(a) loans receivable, subject to credit risk | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input for loans receivable	0.1100	0.1100
Maximum | SBA 7(a) loans receivable, subject to credit risk | Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input for loans receivable	0.1750	0.1750
Maximum | SBA 7(a) loans receivable, subject to loan-backed notes | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input for loans receivable	0.1100	0.1100
Maximum | SBA 7(a) loans receivable, subject to loan-backed notes | Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input for loans receivable	0.1750	0.1750
Maximum | SBA 7(a) loans receivable, subject to secured borrowings | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input for loans receivable	0.1050	0.1050
Maximum | SBA 7(a) loans receivable, subject to secured borrowings | Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input for loans receivable	0.1750	0.1750