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Allowance for Loan Losses - Additional information (Details) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Provision expense for loan losses $ (400,000) $ 400,000  
Loans, net of unearned income $ 978,372,000   $ 985,054,000
Non-performing assets as a percent of loans 0.35%   0.34%
Allowance for Loan and Lease Losses Write-offs, Net $ 76,000 $ 114,000  
Allowance For Loan And Lease Losses Write Off Percentage 0.03% 0.05%  
Increase in allowance for loan losses $ 291,000    
Percentage increase in the allowance balance 2.50%    
Percentage Of Allowance For Non Performing Assets 351.00%   373.00%
Percentage Of Allowance For Total Loans 1.22%   1.26%
Amount of favorable shift $ 800,000    
Financing Receivable, Individually Evaluated for Impairment 2,132,000   $ 2,170,000
Non-performing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income $ 3,400,000   $ 3,300,000
Non-performing assets as a percent of loans 0.35%   0.34%
Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income $ 134,797,000   $ 134,182,000
Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Minimum individual loan balance requiring quarterly review 2,000,000    
Special Mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Minimum individual loan balance requiring quarterly review 250,000    
Substandard      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Minimum individual loan balance requiring quarterly review 250,000    
Doubtful      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Minimum individual loan balance requiring quarterly review 100,000    
Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 671,211,000   681,962,000
Commercial | Commercial.      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 241,106,000   251,137,000
Minimum aggregate balances for commercial loan relationship under structure loan rating process 1,000,000    
Financing Receivable, Individually Evaluated for Impairment 2,127,000   2,165,000
Commercial | Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 134,797,000   134,182,000
Commercial | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 640,727,000   639,765,000
Commercial | Special Mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 10,963,000   26,341,000
Commercial | Substandard      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 19,516,000   14,208,000
Commercial | Doubtful      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income $ 5,000   1,648,000
Commercial | Minimum | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Minimum percent of portfolio to be reviewed 40.00%    
Consumer.      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income $ 307,161,000   $ 303,092,000
Consumer. | Minimum | Consumer and Residential Mortgage Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Individually Evaluated for Impairment $ 150,000