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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Summary of Allowance for credit losses (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Troubled debt restructured loans $ 252,000 $ 263,000
Non-accrual and 90+ days past due and still accruing loans to average loans 0.85% 1.32%
Allowance for credit losses to non-accrual and 90 days or more and still accruing loans 112.10% 77.70%
Commercial    
Financing Receivable, Impaired [Line Items]    
Troubled debt restructured loans $ 208,000  
Consumer    
Financing Receivable, Impaired [Line Items]    
Troubled debt restructured loans $ 44,000