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Loans - TDR's by Class and Specific Reserves (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 USD ($) loan | Dec. 31, 2017 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 71 | 67 | 62
Balance | $ 25,661 | $ 19,760 | $ 17,801
Specific Reserves | $ 1,476 | $ 456 | $ 323
Commercial | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 16 | 9 | 8
Balance | $ 8,542 | $ 7,908 | $ 7,038
Specific Reserves | $ 138 | $ 65 | $ 90
Commercial | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 1 | 1 | 1
Balance | $ 741 | $ 763 | $ 741
Specific Reserves | $ 0 | $ 108 | $ 0
Commercial | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 5 | 5 | 4
Balance | $ 7,007 | $ 730 | $ 561
Specific Reserves | $ 1,100 | $ 0 | $ 0
Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 0 | 0 | 0
Balance | $ 0 | $ 0 | $ 0
Specific Reserves | $ 0 | $ 0 | $ 0
Residential | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 0 | 0 | 0
Balance | $ 0 | $ 0 | $ 0
Specific Reserves | $ 0 | $ 0 | $ 0
Residential | Term |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 46 | 49 | 46
Balance | $ 8,869 | $ 9,842 | $ 8,948
Specific Reserves | $ 238 | $ 283 | $ 233
Home equity line of credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 3 | 3 | 3
Balance | $ 502 | $ 517 | $ 513
Specific Reserves | $ 0 | $ 0 | $ 0
Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 0 | 0 | 0
Balance | $ 0 | $ 0 | $ 0
Specific Reserves | $ 0 | $ 0 | $ 0

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