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Allowance for Loan Losses - Additional information (Details)
 3 Months Ended
Mar. 31, 2021
USD ($)
loan
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Provision expense for loan losses $ 400,000 $ 175,000  
Provision recovery recorded (400,000) (175,000)  
Increase in provision expense $ 225,000    
Number of loans transferred | loan 2    
Financing Receivable, Individually Evaluated for Impairment $ 2,582,000   $ 855,000
Percentage Of Allowance For Total Loans 1.18%   1.16%
Non-performing assets as a percent of loans 0.43%   0.34%
Allowance for Loan and Lease Losses Write-offs, Net $ 114,000 $ 120,000  
Allowance For Loan And Lease Losses Write Off Percentage 0.05% 0.06%  
Increase in allowance for loan losses $ 2,300,000    
Percentage of credit loss to total loans 24.60%    
Allowance for loan losses $ 11,600,000    
Percentage Of Allowance For Non Performing Assets 274.00%   341.00%
Financing Receivable, Recorded Investment, Past Due $ 3,041,000   $ 7,839,000
Non-performing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 4,200,000   $ 3,300,000
Non-performing assets as a percent of loans 0.43%   0.34%
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 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Minimum individual loan balance requiring quarterly review 250,000    
Doubtful [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Minimum individual loan balance requiring quarterly review 100,000    
Commercial | Commercial.      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Provision recovery recorded (205,000) $ 91,000  
Financing Receivable, Individually Evaluated for Impairment 2,574,000   $ 847,000
Minimum aggregate balances for commercial loan relationship under structure loan rating process 1,000,000    
Commercial | Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due $ 0   $ 3,139,000
Commercial | Minimum | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Minimum percent of portfolio to be reviewed 36.00%    
Consumer | Minimum | Consumer and Residential Mortgage Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Individually Evaluated for Impairment $ 150,000