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Allowance for Loan Losses - Financing Receivable and Allowance Element by Class (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 15,371 | $ 14,110 | $ 11,639 | $ 11,765 | $ 11,471 | $ 11,232
Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 890 |  | 2,213 | 2,060 |  |
General Reserves on Loans Based on Historical Loss Experience |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 1,826 |  | 1,983 | 1,937 |  |
Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 11,079 |  | 6,261 | 6,061 |  |
Unallocated Reserves |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 1,576 |  | 1,182 | 1,707 |  |
Commercial | Real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 4,761 | 4,511 | 3,742 | 3,795 | 3,609 | 3,567
Commercial | Real estate | Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 135 |  | 251 | 258 |  |
Commercial | Real estate | General Reserves on Loans Based on Historical Loss Experience |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 686 |  | 729 | 792 |  |
Commercial | Real estate | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 3,940 |  | 2,762 | 2,745 |  |
Commercial | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 607 | 524 | 365 | 353 | 309 | 255
Commercial | Construction | Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 19 |  | 0 | 0 |  |
Commercial | Construction | General Reserves on Loans Based on Historical Loss Experience |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 87 |  | 76 | 79 |  |
Commercial | Construction | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 501 |  | 289 | 274 |  |
Commercial | Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 3,642 | 3,689 | 3,329 | 3,220 | 3,281 | 3,541
Commercial | Other | Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 128 |  | 1,273 | 1,275 |  |
Commercial | Other | General Reserves on Loans Based on Historical Loss Experience |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 521 |  | 430 | 436 |  |
Commercial | Other | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 2,993 |  | 1,626 | 1,509 |  |
Municipal |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 139 | 110 | 27 | 26 | 25 | 24
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 | 139 |  | 27 | 26 |  |
Residential | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 81 | 64 | 25 | 23 | 23 | 34
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 |  | 5 | 5 |  |
Residential | Construction | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 71 |  | 20 | 18 |  |
Residential | Term |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 2,516 | 2,261 | 1,024 | 1,137 | 1,106 | 1,235
Residential | Term | Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 204 |  | 237 | 337 |  |
Residential | Term | General Reserves on Loans Based on Historical Loss Experience |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 275 |  | 153 | 185 |  |
Residential | Term | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 2,037 |  | 634 | 615 |  |
Home equity line of credit |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 1,457 | 1,284 | 1,078 | 824 | 633 | 730
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 | 403 |  | 447 | 184 |  |
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 | 79 |  | 130 | 155 |  |
Home equity line of credit | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 975 |  | 501 | 485 |  |
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 592 | 658 | 867 | 680 | 649 | 630
Consumer | Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 1 |  | 5 | 6 |  |
Consumer | General Reserves on Loans Based on Historical Loss Experience |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 168 |  | 460 | 285 |  |
Consumer | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 423 |  | 402 | 389 |  |
Unallocated |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 1,576 | $ 1,009 | 1,182 | 1,707 | $ 1,836 | $ 1,216
Unallocated | Unallocated Reserves |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 1,576 |  | $ 1,182 | $ 1,707 |  |

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