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FAIR VALUE MEASUREMENTS AND FAIR VALUES OF FINANCIAL INSTRUMENTS - Level 3 Valuation Techniques Recurring (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Recurring fair value measurements |  |
Valuation Techniques and the Unobservable Inputs |  |
Fair value | $ 1,689,000 | $ 1,277,000
Valuation Technique, Discounted cash flow | Servicing rights |  |
Valuation Techniques and the Unobservable Inputs |  |
Discount rate | 13.00% | 12.50%
Weighted-average PSA | 277.00% | 183.00%
Servicing fees of loan balances | 0.25% | 0.25%
Servicing fees of payments are late | 4.00% | 4.00%
Late fees assessed | 5.00% | 5.00%
Miscellaneous fees per account per month | $ 1.94 | $ 1.94
Monthly servicing cost per account | 6.00 | 6.00
Additional monthly servicing cost per loan on loans more than 30 days delinquent | $ 24.00 | $ 24.00
Servicing costs of loans more than 30 days delinquent | 1.50% | 1.50%
Annual increase in servicing costs | 3.00% | 3.00%
Valuation Technique, Discounted cash flow | Recurring fair value measurements |  |
Valuation Techniques and the Unobservable Inputs |  |
Fair value | $ 1,689,000 | $ 1,277,000

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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References No definition available. + Details
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