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Allowance for Loan Losses - Financing Receivable and Allowance Element by Class (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 10,729 | $ 10,138 | $ 9,916 | $ 10,344
Commercial | Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 3,872 | 3,988 | 3,120 | 3,532
Commercial | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 434 | 396 | 580 | 823
Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 3,358 | 1,780 | 1,452 | 1,505
Municipal |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 20 | 18 | 17 | 15
Residential | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 36 | 44 | 24 | 20
Residential | Term |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 1,130 | 1,288 | 1,391 | 1,185
Home Equity LIne of Credit |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 692 | 807 | 893 | 1,060
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 545 | 559 | 566 | 542
Unallocated |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 642 | 1,258 | $ 1,873 | $ 1,662
Specific Reserves on Loans Evaluated Individually for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 1,812 | 974 |  |
Specific Reserves on Loans Evaluated Individually for Impairment | Commercial | Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 224 | 505 |  |
Specific Reserves on Loans Evaluated Individually for Impairment | Commercial | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 100 |  |
Specific Reserves on Loans Evaluated Individually for Impairment | Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 1,309 | 39 |  |
Specific Reserves on Loans Evaluated Individually for Impairment | Municipal |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Specific Reserves on Loans Evaluated Individually for Impairment | Residential | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Specific Reserves on Loans Evaluated Individually for Impairment | Residential | Term |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 255 | 304 |  |
Specific Reserves on Loans Evaluated Individually for Impairment | Home Equity LIne of Credit |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 24 | 26 |  |
Specific Reserves on Loans Evaluated Individually for Impairment | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Specific Reserves on Loans Evaluated Individually for Impairment | Unallocated |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 0 |  |
General Reserves on Loans Based on Historical Loss Experience |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 3,033 | 3,691 |  |
General Reserves on Loans Based on Historical Loss Experience | Commercial | Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 1,285 | 1,471 |  |
General Reserves on Loans Based on Historical Loss Experience | Commercial | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 153 | 125 |  |
General Reserves on Loans Based on Historical Loss Experience | Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 723 | 735 |  |
General Reserves on Loans Based on Historical Loss Experience | Municipal |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 0 |  |
General Reserves on Loans Based on Historical Loss Experience | Residential | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 13 | 25 |  |
General Reserves on Loans Based on Historical Loss Experience | Residential | Term |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 311 | 563 |  |
General Reserves on Loans Based on Historical Loss Experience | Home Equity LIne of Credit |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 297 | 444 |  |
General Reserves on Loans Based on Historical Loss Experience | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 251 | 328 |  |
General Reserves on Loans Based on Historical Loss Experience | Unallocated |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Reserves for Qualitative Factors |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 5,242 | 4,215 |  |
Reserves for Qualitative Factors | Commercial | Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 2,363 | 2,012 |  |
Reserves for Qualitative Factors | Commercial | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 281 | 171 |  |
Reserves for Qualitative Factors | Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 1,326 | 1,006 |  |
Reserves for Qualitative Factors | Municipal |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 20 | 18 |  |
Reserves for Qualitative Factors | Residential | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 23 | 19 |  |
Reserves for Qualitative Factors | Residential | Term |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 564 | 421 |  |
Reserves for Qualitative Factors | Home Equity LIne of Credit |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 371 | 337 |  |
Reserves for Qualitative Factors | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 294 | 231 |  |
Reserves for Qualitative Factors | Unallocated |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Unallocated Reserves |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 642 | 1,258 |  |
Unallocated Reserves | Commercial | Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Unallocated Reserves | Commercial | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Unallocated Reserves | Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Unallocated Reserves | Municipal |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Unallocated Reserves | Residential | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Unallocated Reserves | Residential | Term |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Unallocated Reserves | Home Equity LIne of Credit |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Unallocated Reserves | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Unallocated Reserves | Unallocated |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 642 | $ 1,258 |  |

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