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Loans - Past-due Status of Loans by Class (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | $ 12,658 | $ 8,287 |
Current | 1,058,868 | 980,351 |
Loans | 1,071,526 | 988,638 | $ 917,564
90 Plus Days And Accruing | 777 | 136 |
Commercial | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 3,476 | 884 |
Current | 299,030 | 268,578 |
Loans | 302,506 | 269,462 | 242,311
90 Plus Days And Accruing | 753 | 0 |
Commercial | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 0 | 273 |
Current | 25,406 | 24,608 |
Loans | 25,406 | 24,881 | 30,932
90 Plus Days And Accruing | 0 | 0 |
Commercial | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 1,031 | 328 |
Current | 149,738 | 128,013 |
Loans | 150,769 | 128,341 | 104,531
90 Plus Days And Accruing | 20 | 25 |
Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 0 | 0 |
Current | 27,056 | 19,751 |
Loans | 27,056 | 19,751 | 20,424
90 Plus Days And Accruing | 0 | 0 |
Residential | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 0 | 368 |
Current | 18,303 | 8,083 |
Loans | 18,303 | 8,451 | 12,160
90 Plus Days And Accruing | 0 | 0 |
Residential | Term |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 6,403 | 5,187 |
Current | 405,066 | 397,843 |
Loans | 411,469 | 403,030 | 384,032
90 Plus Days And Accruing | 0 | 100 |
Home Equity LIne of Credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 1,564 | 1,108 |
Current | 109,343 | 109,094 |
Loans | 110,907 | 110,202 | 103,521
90 Plus Days And Accruing | 0 | 0 |
Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 184 | 139 |
Current | 24,926 | 24,381 |
Loans | 25,110 | 24,520 | $ 19,653
90 Plus Days And Accruing | 4 | 11 |
30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 2,711 | 2,122 |
30-59 Days Past Due | Commercial | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 1,039 | 603 |
30-59 Days Past Due | Commercial | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 0 | 35 |
30-59 Days Past Due | Commercial | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 202 | 303 |
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 | 0 | 368 |
30-59 Days Past Due | Residential | Term |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 631 | 450 |
30-59 Days Past Due | Home Equity LIne of Credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 704 | 261 |
30-59 Days Past Due | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 135 | 102 |
60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 4,227 | 2,379 |
60-89 Days Past Due | Commercial | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 22 | 0 |
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 | 33 | 0 |
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 | 0 | 0 |
60-89 Days Past Due | Residential | Term |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 3,970 | 2,098 |
60-89 Days Past Due | Home Equity LIne of Credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 157 | 255 |
60-89 Days Past Due | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 45 | 26 |
90 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 5,720 | 3,786 |
90 Days Past Due | Commercial | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 2,415 | 281 |
90 Days Past Due | Commercial | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 0 | 238 |
90 Days Past Due | Commercial | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 796 | 25 |
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 | 1,802 | 2,639 |
90 Days Past Due | Home Equity LIne of Credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | 703 | 592 |
90 Days Past Due | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due | $ 4 | $ 11 |

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