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Loans - TDRs by Class and Specific Reserve (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | loan | 62 | 71
Balance | $ 17,801 | $ 21,526
Specific Reserves | $ 323 | $ 736
Commercial | Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | loan | 8 | 10
Balance | $ 7,038 | $ 8,937
Specific Reserves | $ 90 | $ 375
Commercial | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | loan | 1 | 1
Balance | $ 741 | $ 763
Specific Reserves | $ 0 | $ 100
Commercial | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | loan | 4 | 5
Balance | $ 561 | $ 779
Specific Reserves | $ 0 | $ 0
Municipal |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | loan | 0 | 0
Balance | $ 0 | $ 0
Specific Reserves | $ 0 | $ 0
Residential | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | loan | 0 | 0
Balance | $ 0 | $ 0
Specific Reserves | $ 0 | $ 0
Residential | Term |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | loan | 46 | 52
Balance | $ 8,948 | $ 10,503
Specific Reserves | $ 233 | $ 261
Home Equity LIne of Credit |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | loan | 3 | 3
Balance | $ 513 | $ 544
Specific Reserves | $ 0 | $ 0
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | loan | 0 | 0
Balance | $ 0 | $ 0
Specific Reserves | $ 0 | $ 0

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
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