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ALLOWANCE FOR LOAN LOSSES - Additional information (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Provision expense for loan losses $ 250,000 $ 350,000 $ 100,000 $ 400,000 $ 1,075,000 $ 675,000 $ 450,000 $ 175,000 $ 1,100,000 $ 2,375,000 $ 800,000  
Non-performing assets as a percent of loans 0.34%       0.34%       0.34% 0.34%    
Allowance for loan losses $ 12,398,000       $ 11,345,000       $ 12,398,000 $ 11,345,000 9,279,000 $ 8,671,000
Financing Receivable, Individually Evaluated for Impairment 2,170,000       855,000       2,170,000 855,000    
Provision recovery recorded                 (1,100,000) (2,375,000) (800,000)  
Financing Receivable, Recorded Investment, Current 977,589,000       964,256,000       977,589,000 964,256,000    
Commercial.                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Allowance for loan losses 3,071,000       3,472,000       3,071,000 3,472,000    
Financing Receivable, Individually Evaluated for Impairment         847,000         847,000    
Provision recovery recorded                 344,000      
Commercial loans secured by Non-Owner Occupied real estate                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Allowance for loan losses 6,392,000       5,373,000       6,392,000 5,373,000    
Financing Receivable, Individually Evaluated for Impairment         8,000         8,000    
Provision recovery recorded                 (968,000)      
Financing Receivable, Recorded Investment, Current 428,790,000       399,850,000       428,790,000 399,850,000    
Commercial loans secured by Non-Owner Occupied real estate | COVID 19                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Provision recovery recorded                 (968,000) (2,200,000) $ (255,000)  
Commercial and Industrial                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Financing Receivable, Recorded Investment, Current 133,918,000       148,023,000       133,918,000 148,023,000    
Pass                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Minimum individual loan balance requiring quarterly review 2,000,000               2,000,000      
Special Mention                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Financing Receivable Threshold For Individually Evaluating Of Impairment 250,000               250,000      
Substandard                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Financing Receivable Threshold For Individually Evaluating Of Impairment 250,000               250,000      
Doubtful                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Minimum individual loan balance requiring quarterly review 100,000               $ 100,000      
Minimum | Commercial.                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Minimum percent of portfolio to be reviewed                 36.00%      
Commercial                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Minimum aggregate balances for commercial loan relationship under structure loan rating process 1,000,000               $ 1,000,000      
Commercial | COVID 19                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of sizable downgrades | item                     2  
Provision recovery recorded                 344,000 372,000 $ (881,000)  
Commercial | Commercial.                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Allowance for loan losses 3,071,000       3,472,000       3,071,000 3,472,000 3,951,000 3,057,000
Financing Receivable, Individually Evaluated for Impairment 2,165,000               2,165,000      
Minimum aggregate balances for commercial loan relationship under structure loan rating process 1,000,000               1,000,000      
Provision recovery recorded                   372,000 (881,000)  
Commercial | Commercial loans secured by Non-Owner Occupied real estate                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Allowance for loan losses 6,392,000       $ 5,373,000       6,392,000 5,373,000 3,119,000 $ 3,389,000
Financing Receivable, Individually Evaluated for Impairment 5,000               5,000      
Provision recovery recorded                   $ (2,210,000) $ 255,000  
Consumer. | Minimum | Consumer and Residential Mortgage Loans                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Financing Receivable, Individually Evaluated for Impairment $ 150,000               $ 150,000