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ALLOWANCE FOR LOAN LOSSES - Additional information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Individually Evaluated for Impairment $ 824,000 $ 824,000 $ 11,000  
Debt Instrument Non Performing Assets   $ 2,300,000 $ 1,400,000  
Non-performing assets as a percent of loans 0.26% 0.26% 0.16%  
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease) $ 675,000 $ 1,400,000 $ (1,400,000)  
Allowance for Loan and Lease Losses Write-offs, Net   $ 192,000 $ 943,000 $ 51,800
Allowance For Loan And Lease Losses Write Off Percentage   0.02% 0.11% 0.06%
Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Individually Evaluated for Impairment 816,000 $ 816,000 $ 0  
Minimum aggregate balances for commercial loan relationship under structure loan rating process 1,000,000 1,000,000    
Pass [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Minimum individual loan balance requiring quarterly review 2,000,000 2,000,000    
Special Mention [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable Threshold For Individually Evaluating Of Impairment 250,000 250,000    
Substandard [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable Threshold For Individually Evaluating Of Impairment 250,000 250,000    
Substandard [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance of commercial loan, downgraded   6,500,000    
Doubtful [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Minimum individual loan balance requiring quarterly review 100,000 $ 100,000    
Minimum | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Minimum percent of portfolio to be reviewed   50.00%    
Minimum | Consumer and Residential Mortgage Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Individually Evaluated for Impairment $ 150,000 $ 150,000    
Maximum | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Minimum percent of portfolio to be reviewed   55.00%