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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Summary of allowance for credit losses (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]    
Troubled debt restructured loans $ 39,000 $ 41,000
Non-accrual and 90+ days past due and still accruing loans to average loans 1.78% 1.45%
Allowance for credit losses to non-accrual and 90 days or more and still accruing loans 33.40% 49.80%
Consumer    
Financing Receivable, Impaired [Line Items]    
Troubled debt restructured loans $ 39,000