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Allowance for Loan Losses - Financing Receivable and Allowance Element by Class (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 11,471 | $ 11,490 | $ 11,232 | $ 11,472 | $ 10,957 | $ 10,729
Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 1,830 |  | 2,308 | 2,205 |  |
General Reserves on Loans Based on Historical Loss Experience |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 1,956 |  | 2,085 | 2,630 |  |
Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 5,849 |  | 5,623 | 5,212 |  |
Unallocated Reserves |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 1,836 |  | 1,216 | 1,425 |  |
Commercial | Real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 3,609 | 3,632 | 3,567 | 3,732 | 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 | 196 |  | 260 | 270 |  |
Commercial | Real estate | General Reserves on Loans Based on Historical Loss Experience |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 789 |  | 742 | 1,067 |  |
Commercial | Real estate | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 2,624 |  | 2,565 | 2,395 |  |
Commercial | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 309 | 325 | 255 | 399 | 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 | 72 |  | 57 | 123 |  |
Commercial | Construction | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 237 |  | 198 | 276 |  |
Commercial | Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 3,281 | 3,430 | 3,541 | 3,475 | 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 | 1,320 |  | 1,696 | 1,647 |  |
Commercial | Other | General Reserves on Loans Based on Historical Loss Experience |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 457 |  | 414 | 563 |  |
Commercial | Other | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 1,504 |  | 1,431 | 1,265 |  |
Municipal |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 25 | 25 | 24 | 21 | 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 | 23 | 30 | 34 | 29 | 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 | 6 |  | 12 | 10 |  |
Residential | Construction | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 17 |  | 22 | 19 |  |
Residential | Term |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 1,106 | 1,114 | 1,235 | 1,138 | 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 | 305 |  | 335 | 286 |  |
Residential | Term | General Reserves on Loans Based on Historical Loss Experience |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 197 |  | 326 | 311 |  |
Residential | Term | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 604 |  | 574 | 541 |  |
Home equity line of credit |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 633 | 630 | 730 | 678 | 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 | 9 |  | 17 | 2 |  |
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 | 156 |  | 263 | 287 |  |
Home equity line of credit | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 468 |  | 450 | 389 |  |
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 649 | 660 | 630 | 575 | 581 | 545
Consumer | Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 0 |  | 0 | 0 |  |
Consumer | General Reserves on Loans Based on Historical Loss Experience |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 279 |  | 271 | 269 |  |
Consumer | Reserves for Qualitative Factors |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 370 |  | 359 | 306 |  |
Unallocated |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 1,836 | $ 1,644 | 1,216 | 1,425 | $ 811 | $ 642
Unallocated | Unallocated Reserves |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 1,836 |  | $ 1,216 | $ 1,425 |  |

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