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Loans - TDR's by Class and Specific Reserves (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) loan | Sep. 30, 2016 USD ($) loan | Dec. 31, 2016 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 67 | 75 | 71
Balance | $ 19,760 | $ 22,025 | $ 21,526
Specific Reserves | $ 456 | $ 492 | $ 736
Commercial | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 9 | 11 | 10
Balance | $ 7,908 | $ 9,221 | $ 8,937
Specific Reserves | $ 65 | $ 116 | $ 375
Commercial | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 1 | 1 | 1
Balance | $ 763 | $ 788 | $ 763
Specific Reserves | $ 108 | $ 99 | $ 100
Commercial | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 5 | 7 | 5
Balance | $ 730 | $ 841 | $ 779
Specific Reserves | $ 0 | $ 5 | $ 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 | 49 | 53 | 52
Balance | $ 9,842 | $ 10,626 | $ 10,503
Specific Reserves | $ 283 | $ 272 | $ 261
Home equity line of credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 3 | 3 | 3
Balance | $ 517 | $ 549 | $ 544
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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