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FAIR VALUE MEASUREMENTS AND FAIR VALUES OF FINANCIAL INSTRUMENTS - Valuation Techniques and the Unobservable Inputs (Details) - Recurring fair value measurements - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Valuation Techniques and the Unobservable Inputs    
Fair value $ 1,437,000 $ 1,277,000
Valuation Technique, Discounted cash flow    
Valuation Techniques and the Unobservable Inputs    
Fair value $ 1,437,000 $ 1,277,000
Valuation Technique, Discounted cash flow | Servicing rights    
Valuation Techniques and the Unobservable Inputs    
Discount rate 12.50% 12.50%
Weighted-average PSA 354.00% 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%