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Allowance for Loan Losses - Financing Receivable and Allowance Element by Class (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 17,507 | $ 17,034 | $ 16,253 | $ 15,371 | $ 14,110 | $ 11,639
Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 682 |  | 462 | 890 |  |
General Reserves on Loans Based on Historical Loss Experience |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 2,004 |  | 1,862 | 1,826 |  |
Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 13,334 |  | 11,795 | 11,079 |  |
Unallocated Reserves |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 1,487 |  | 2,134 | 1,576 |  |
Commercial | Real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 6,499 | 6,088 | 5,178 | 4,761 | 4,511 | 3,742
Commercial | Real estate | Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 138 |  | 112 | 135 |  |
Commercial | Real estate | General Reserves on Loans Based on Historical Loss Experience |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 864 |  | 721 | 686 |  |
Commercial | Real estate | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 5,497 |  | 4,345 | 3,940 |  |
Commercial | Real estate | Unallocated Reserves |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 0 |  | 0 | 0 |  |
Commercial | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 879 | 750 | 662 | 607 | 524 | 365
Commercial | Construction | Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 18 |  | 18 | 19 |  |
Commercial | Construction | General Reserves on Loans Based on Historical Loss Experience |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 117 |  | 92 | 87 |  |
Commercial | Construction | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 744 |  | 552 | 501 |  |
Commercial | Construction | Unallocated Reserves |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 0 |  | 0 | 0 |  |
Commercial | Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 3,727 | 3,757 | 3,438 | 3,642 | 3,689 | 3,329
Commercial | Other | Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 397 |  | 169 | 128 |  |
Commercial | Other | General Reserves on Loans Based on Historical Loss Experience |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 452 |  | 465 | 521 |  |
Commercial | Other | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 2,878 |  | 2,804 | 2,993 |  |
Commercial | Other | Unallocated Reserves |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 0 |  | 0 | 0 |  |
Municipal |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 189 | 187 | 171 | 139 | 110 | 27
Municipal | Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 0 |  | 0 | 0 |  |
Municipal | General Reserves on Loans Based on Historical Loss Experience |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 0 |  | 0 | 0 |  |
Municipal | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 189 |  | 171 | 139 |  |
Municipal | Unallocated Reserves |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 0 |  | 0 | 0 |  |
Residential | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 142 | 160 | 102 | 81 | 64 | 25
Residential | Construction | Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 0 |  | 0 | 0 |  |
Residential | Construction | General Reserves on Loans Based on Historical Loss Experience |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 10 |  | 6 | 10 |  |
Residential | Construction | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 132 |  | 96 | 71 |  |
Residential | Construction | Unallocated Reserves |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 0 |  | 0 | 0 |  |
Residential | Term |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 2,761 | 2,896 | 2,579 | 2,516 | 2,261 | 1,024
Residential | Term | Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 129 |  | 163 | 204 |  |
Residential | Term | General Reserves on Loans Based on Historical Loss Experience |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 189 |  | 145 | 275 |  |
Residential | Term | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 2,443 |  | 2,271 | 2,037 |  |
Residential | Term | Unallocated Reserves |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 0 |  | 0 | 0 |  |
Home equity line of credit |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 956 | 959 | 1,211 | 1,457 | 1,284 | 1,078
Home equity line of credit | Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 0 |  | 0 | 403 |  |
Home equity line of credit | General Reserves on Loans Based on Historical Loss Experience |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 109 |  | 151 | 79 |  |
Home equity line of credit | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 847 |  | 1,060 | 975 |  |
Home equity line of credit | Unallocated Reserves |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 0 |  | 0 | 0 |  |
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 867 | 892 | 778 | 592 | 658 | 867
Consumer | Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 0 |  | 0 | 1 |  |
Consumer | General Reserves on Loans Based on Historical Loss Experience |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 263 |  | 282 | 168 |  |
Consumer | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 604 |  | 496 | 423 |  |
Consumer | Unallocated Reserves |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 0 |  | 0 | 0 |  |
Unallocated |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 1,487 | $ 1,345 | 2,134 | 1,576 | $ 1,009 | $ 1,182
Unallocated | Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 0 |  | 0 | 0 |  |
Unallocated | General Reserves on Loans Based on Historical Loss Experience |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 0 |  | 0 | 0 |  |
Unallocated | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 0 |  | 0 | 0 |  |
Unallocated | Unallocated Reserves |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 1,487 |  | $ 2,134 | $ 1,576 |  |

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