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Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | --- | ---
Schedule of Financing Receivables [Line Items] |  |  |
Nonaccrual loans | $ 16,376 | $ 7,774 | $ 7,130
Commercial | Real estate |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Nonaccrual loans | 1,929 | 1,907 | 1,222
Commercial | Construction |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Nonaccrual loans | 0 | 0 | 0
Commercial | Other |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Nonaccrual loans | 9,520 | 964 | 412
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 | 3,875 | 4,060 | 4,475
Home equity line of credit |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Nonaccrual loans | 1,001 | 843 | 851
Consumer |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Nonaccrual loans | $ 51 | $ 0 | $ 170

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