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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, 2023 | Dec. 31, 2022
Recurring fair value measurements |  |
Valuation Techniques and the Unobservable Inputs |  |
Fair value | $ 2,659,000 | $ 2,653,000
Valuation Technique, Discounted cash flow | Servicing rights. |  |
Valuation Techniques and the Unobservable Inputs |  |
Discount rate | 13.00% | 13.00%
Weighted-average PSA | 131.00% | 133.00%
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 | $ 2,659,000 | $ 2,653,000

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