FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value Measurement Inputs (Details) - Valuation Technique, Discounted Cash Flow	Dec. 31, 2021	Dec. 31, 2020
SBA 7(a) loans receivable, Paycheck Protection Program | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input for loans receivable	0.0100	1
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	0.0625	0.0650
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	0.0500	0.0400
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	0.0575	0.0550
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	0.0500	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	0.0700	0.0700
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	0.0825	0.0825
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	0.0775	0.0800
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	0.0775	0.0775
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