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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Summary of allowance for credit losses (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Troubled debt restructured loans $ 241,000 $ 248,000
Non-accrual and 90+ days past due and still accruing loans to average loans 1.61% 0.73%
Allowance for credit losses to non-accrual and 90 days or more and still accruing loans 54.00% 128.70%
Commercial    
Financing Receivable, Impaired [Line Items]    
Troubled debt restructured loans $ 199,000  
Consumer    
Financing Receivable, Impaired [Line Items]    
Troubled debt restructured loans $ 42,000