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Loans and Allowance for Credit Losses on Loans (Additional Information) (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
SBA PPP Loans, Total Originations, Number of Contracts | loan 3,034    
SB PPP Loans, Total Originations $ 244,800,000    
Loans and Leases Receivable, Related Parties, Description At December 31, 2020 and 2019, outstanding loans to certain officers, directors and their associated companies were less than 5% of the Company's shareholders' equity. At December 31, 2020 and 2019, outstanding loans to certain officers, directors and their associated companies were less than 5% of the Company's shareholders' equity.  
Number of Portfolio Concentration Industries 0    
Foregone interest $ 335,000 $ 420,000 $ 600,000
Loans and Leases Receivable, Impaired, Commitment to Lend $ 0    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan 0 0  
Allowance Related to Troubled Debt Restructurings assigned during period $ 0 $ 15,000 $ 95,000
Loans and Leases Receivable, Deferred Income 856,000 3,111,000  
Residential real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable in Process of Foreclosure 1,500,000 1,300,000  
Loans Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Performing TDRs 2,800,000 3,000,000.0  
Non-Performing TDRs 248,000 $ 636,000  
SBA PPP Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Deferred Income $ 2,200,000    
Minimum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Months 18    
Maximum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Months 24    
Total Loan Portfolio [Member] | Loan Concentration Risk [Member] | Non-Residential Building Operators Industry Sector [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Concentration Risk, Percentage 14.00%    
Commercial real estate | Loan Concentration Risk [Member] | Non-Residential Building Operators Industry Sector [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Concentration Risk, Percentage 32.00%    
Home Equity Loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     1
Allowance Related to Troubled Debt Restructurings assigned during period     $ 162,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment     $ 299,000