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Loans and Allowance for Credit Losses on Loans (Additional Information) (Details) | 12 Months Ended
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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

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