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Loans - Loan Portfolio (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 1,164,139 | $ 1,071,526 | $ 988,638
Percentage of loans receivable | 100.00% | 100.00% |
Commercial | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 323,809 | $ 302,506 | 269,462
Percentage of loans receivable | 27.80% | 28.20% |
Commercial | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 38,056 | $ 25,406 | 24,881
Percentage of loans receivable | 3.30% | 2.40% |
Commercial | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 181,528 | $ 150,769 | 128,341
Percentage of loans receivable | 15.60% | 14.10% |
Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 33,391 | $ 27,056 | 19,751
Percentage of loans receivable | 2.90% | 2.50% |
Residential | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 17,868 | $ 18,303 | 8,451
Percentage of loans receivable | 1.50% | 1.70% |
Residential | Term |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 432,661 | $ 411,469 | 403,030
Percentage of loans receivable | 37.10% | 38.40% |
Home Equity LIne of Credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 111,302 | $ 110,907 | 110,202
Percentage of loans receivable | 9.60% | 10.40% |
Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 25,524 | $ 25,110 | $ 24,520
Percentage of loans receivable | 2.20% | 2.30% |

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- Definition Reflects the break down of the gross carrying amount of all categories of loans and leases held in the portfolio, after deducting deferred income, but before deducting the allowance for losses on loans and leases as a percentage of total portfolio. + References No definition available. + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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