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Loans - TDR's by Class and Specific Reserves (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) loan | Jun. 30, 2017 USD ($) loan | Dec. 31, 2017 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 72 | 68 | 62
Balance | $ 25,606 | $ 20,301 | $ 17,801
Specific Reserves | $ 1,530 | $ 406 | $ 323
Commercial | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 15 | 9 | 8
Balance | $ 8,026 | $ 8,040 | $ 7,038
Specific Reserves | $ 143 | $ 93 | $ 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 | $ 103 | $ 0
Commercial | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 5 | 5 | 4
Balance | $ 7,071 | $ 749 | $ 561
Specific Reserves | $ 1,100 | $ 1 | $ 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 | 48 | 50 | 46
Balance | $ 9,263 | $ 10,227 | $ 8,948
Specific Reserves | $ 287 | $ 209 | $ 233
Home equity line of credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 3 | 3 | 3
Balance | $ 505 | $ 522 | $ 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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