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Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Schedule of Financing Receivables [Line Items] |  |  |
Nonaccrual loans | $ 13,736 | $ 14,727 | $ 14,283
Commercial | Real estate |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Nonaccrual loans | 1,468 | 1,226 | 1,021
Commercial | Construction |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Nonaccrual loans | 286 | 0 | 0
Commercial | Other |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Nonaccrual loans | 7,067 | 8,664 | 8,895
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 | 4,211 | 4,062 | 3,654
Home equity line of credit |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Nonaccrual loans | 702 | 760 | 697
Consumer |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Nonaccrual loans | $ 2 | $ 15 | $ 16

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