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Loans - Past-due Status of Loans by Class (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | $ 18,676 | $ 12,658 |
Current | 1,145,463 | 1,058,868 |
Loans | 1,164,139 | 1,071,526 | $ 988,638
90 Plus Days And Accruing | 445 | 777 |
Commercial | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 874 | 3,476 |
Current | 322,935 | 299,030 |
Loans | 323,809 | 302,506 | 269,462
90 Plus Days And Accruing | 0 | 753 |
Commercial | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 0 | 0 |
Current | 38,056 | 25,406 |
Loans | 38,056 | 25,406 | 24,881
90 Plus Days And Accruing | 0 | 0 |
Commercial | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 7,779 | 1,031 |
Current | 173,749 | 149,738 |
Loans | 181,528 | 150,769 | 128,341
90 Plus Days And Accruing | 0 | 20 |
Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 0 | 0 |
Current | 33,391 | 27,056 |
Loans | 33,391 | 27,056 | 19,751
90 Plus Days And Accruing | 0 | 0 |
Residential | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 471 | 0 |
Current | 17,397 | 18,303 |
Loans | 17,868 | 18,303 | 8,451
90 Plus Days And Accruing | 0 | 0 |
Residential | Term |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 7,659 | 6,403 |
Current | 425,002 | 405,066 |
Loans | 432,661 | 411,469 | 403,030
90 Plus Days And Accruing | 436 | 0 |
Home Equity LIne of Credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 1,707 | 1,564 |
Current | 109,595 | 109,343 |
Loans | 111,302 | 110,907 | 110,202
90 Plus Days And Accruing | 0 | 0 |
Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 186 | 184 |
Current | 25,338 | 24,926 |
Loans | 25,524 | 25,110 | $ 24,520
90 Plus Days And Accruing | 9 | 4 |
30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 2,944 | 2,711 |
30-59 Days Past Due | Commercial | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 574 | 1,039 |
30-59 Days Past Due | Commercial | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 0 | 0 |
30-59 Days Past Due | Commercial | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 542 | 202 |
30-59 Days Past Due | Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 0 | 0 |
30-59 Days Past Due | Residential | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 101 | 0 |
30-59 Days Past Due | Residential | Term |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 1,031 | 631 |
30-59 Days Past Due | Home Equity LIne of Credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 537 | 704 |
30-59 Days Past Due | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 159 | 135 |
60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 11,948 | 4,227 |
60-89 Days Past Due | Commercial | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 80 | 22 |
60-89 Days Past Due | Commercial | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 0 | 0 |
60-89 Days Past Due | Commercial | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 6,663 | 33 |
60-89 Days Past Due | Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 0 | 0 |
60-89 Days Past Due | Residential | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 370 | 0 |
60-89 Days Past Due | Residential | Term |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 4,372 | 3,970 |
60-89 Days Past Due | Home Equity LIne of Credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 445 | 157 |
60-89 Days Past Due | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 18 | 45 |
90 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 3,784 | 5,720 |
90 Days Past Due | Commercial | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 220 | 2,415 |
90 Days Past Due | Commercial | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 0 | 0 |
90 Days Past Due | Commercial | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 574 | 796 |
90 Days Past Due | Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 0 | 0 |
90 Days Past Due | Residential | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 0 | 0 |
90 Days Past Due | Residential | Term |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 2,256 | 1,802 |
90 Days Past Due | Home Equity LIne of Credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 725 | 703 |
90 Days Past Due | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | $ 9 | $ 4 |

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