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Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016
--- | --- | --- | ---
Schedule of Financing Receivables [Line Items] |  |  |
Nonaccrual loans | $ 7,434 | $ 7,774 | $ 6,478
Commercial | Real estate |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Nonaccrual loans | 1,814 | 1,907 | 1,227
Commercial | Construction |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Nonaccrual loans | 0 | 0 | 46
Commercial | Other |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Nonaccrual loans | 885 | 964 | 378
Municipal |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Nonaccrual loans | 0 | 0 | 0
Residential | Construction |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Nonaccrual loans | 0 | 0 | 0
Residential | Term |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Nonaccrual loans | 3,852 | 4,060 | 4,291
Home equity line of credit |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Nonaccrual loans | 883 | 843 | 421
Consumer |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Nonaccrual loans | $ 0 | $ 0 | $ 115

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