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Allowance for Loan Losses - Financing Receivable and Allowance Element by Class (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 11,490 | $ 11,232 | $ 10,957 | $ 10,729
Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 2,075 | 2,308 | 2,206 |
General Reserves on Loans Based on Historical Loss Experience |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 1,955 | 2,085 | 2,593 |
Reserves for Qualitative Factors |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 5,816 | 5,623 | 5,347 |
Unallocated Reserves |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 1,644 | 1,216 | 811 |
Commercial | Real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 3,632 | 3,567 | 3,732 | 3,872
Commercial | Real estate | Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 233 | 260 | 254 |
Commercial | Real estate | General Reserves on Loans Based on Historical Loss Experience |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 790 | 742 | 1,039 |
Commercial | Real estate | Reserves for Qualitative Factors |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 2,609 | 2,565 | 2,439 |
Commercial | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 325 | 255 | 396 | 434
Commercial | Construction | Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 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 | 76 | 57 | 81 |
Commercial | Construction | Reserves for Qualitative Factors |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 249 | 198 | 315 |
Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 3,430 | 3,541 | 3,540 | 3,358
Commercial | Other | Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 1,485 | 1,696 | 1,664 |
Commercial | Other | General Reserves on Loans Based on Historical Loss Experience |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 452 | 414 | 597 |
Commercial | Other | Reserves for Qualitative Factors |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 1,493 | 1,431 | 1,279 |
Municipal |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 25 | 24 | 21 | 20
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 | 25 | 24 | 21 |
Residential | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 30 | 34 | 31 | 36
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 | 7 | 12 | 11 |
Residential | Construction | Reserves for Qualitative Factors |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 23 | 22 | 20 |
Residential | Term |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 1,114 | 1,235 | 1,129 | 1,130
Residential | Term | Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 348 | 335 | 272 |
Residential | Term | General Reserves on Loans Based on Historical Loss Experience |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 182 | 326 | 303 |
Residential | Term | Reserves for Qualitative Factors |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 584 | 574 | 554 |
Home equity line of credit |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 630 | 730 | 716 | 692
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 | 7 | 17 | 16 |
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 | 158 | 263 | 297 |
Home equity line of credit | Reserves for Qualitative Factors |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 465 | 450 | 403 |
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 660 | 630 | 581 | 545
Consumer | Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 2 | 0 | 0 |
Consumer | General Reserves on Loans Based on Historical Loss Experience |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 290 | 271 | 265 |
Consumer | Reserves for Qualitative Factors |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 368 | 359 | 316 |
Unallocated |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 1,644 | 1,216 | 811 | $ 642
Unallocated | Unallocated Reserves |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 1,644 | $ 1,216 | $ 811 |

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