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FAIR VALUE OF FINANCIAL INSTRUMENTS - Narrative (Details) | Sep. 30, 2020 | Dec. 31, 2019
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Measurement Input, Discount Rate | Mortgages Payable | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input for debt | 0.0244 | 0.0367
Measurement Input, Discount Rate | Junior Subordinated Debt | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input for debt | 0.0448 | 0.0616
Measurement Input, Discount Rate | SBA 7(a) loans receivable, subject to credit risk | Minimum | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input for loans receivable | 0.0525 | 0.0525
Measurement Input, Discount Rate | SBA 7(a) loans receivable, subject to credit risk | Maximum | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input for loans receivable | 0.0675 | 0.0775
Measurement Input, Discount Rate | SBA 7(a) loans receivable, subject to loan-backed notes | Minimum | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input for loans receivable | 0.0475 | 0.0525
Measurement Input, Discount Rate | SBA 7(a) loans receivable, subject to loan-backed notes | Maximum | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input for loans receivable | 0.0625 | 0.0725
Measurement Input, Discount Rate | SBA 7(a) loans receivable, paycheck protection program | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input for loans receivable | 0.0100 |
Measurement Input, Discount Rate | SBA 7(a) loans receivable, subject to secured borrowings | Minimum | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input for loans receivable | 0.0575 | 0.0675
Measurement Input, Discount Rate | SBA 7(a) loans receivable, subject to secured borrowings | Maximum | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input for loans receivable | 0.0600 | 0.0750
Measurement Input, Prepayment Rate | SBA 7(a) loans receivable, subject to credit risk | Minimum | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input for loans receivable | 0.0985 | 0.0985
Measurement Input, Prepayment Rate | SBA 7(a) loans receivable, subject to credit risk | Maximum | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input for loans receivable | 0.1750 | 0.1750
Measurement Input, Prepayment Rate | SBA 7(a) loans receivable, subject to loan-backed notes | Minimum | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input for loans receivable | 0.1341 | 0.1341
Measurement Input, Prepayment Rate | SBA 7(a) loans receivable, subject to loan-backed notes | Maximum | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input for loans receivable | 0.1680 | 0.1680
Measurement Input, Prepayment Rate | SBA 7(a) loans receivable, subject to secured borrowings | Minimum | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input for loans receivable | 0.1177 | 0.1177
Measurement Input, Prepayment Rate | SBA 7(a) loans receivable, subject to secured borrowings | Maximum | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input for loans receivable | 0.1680 | 0.1680

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