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Loans - Pre-Modification and Post-Modification Outstanding Recorded Investment (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 loan | Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 loan
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | loan | 1 | 0 | 11 | 0
Pre-Modification Outstanding Recorded Investment | $ 552 |  | $ 8,776 |
Post-Modification Outstanding Recorded Investment | 552 |  | 8,529 |
Specific Reserves | $ 0 |  | $ 1,168 |
Commercial | Real estate |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | loan | 1 |  | 8 |
Pre-Modification Outstanding Recorded Investment | $ 552 |  | $ 1,608 |
Post-Modification Outstanding Recorded Investment | 552 |  | 1,606 |
Specific Reserves | $ 0 |  | $ 42 |
Commercial | Construction |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | loan | 0 |  | 0 |
Pre-Modification Outstanding Recorded Investment | $ 0 |  | $ 0 |
Post-Modification Outstanding Recorded Investment | 0 |  | 0 |
Specific Reserves | $ 0 |  | $ 0 |
Commercial | Other |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | loan | 0 |  | 1 |
Pre-Modification Outstanding Recorded Investment | $ 0 |  | $ 6,727 |
Post-Modification Outstanding Recorded Investment | 0 |  | 6,487 |
Specific Reserves | $ 0 |  | $ 1,100 |
Municipal |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | loan | 0 |  | 0 |
Pre-Modification Outstanding Recorded Investment | $ 0 |  | $ 0 |
Post-Modification Outstanding Recorded Investment | 0 |  | 0 |
Specific Reserves | $ 0 |  | $ 0 |
Residential | Construction |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | loan | 0 |  | 0 |
Pre-Modification Outstanding Recorded Investment | $ 0 |  | $ 0 |
Post-Modification Outstanding Recorded Investment | 0 |  | 0 |
Specific Reserves | $ 0 |  | $ 0 |
Residential | Term |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | loan | 0 |  | 2 |
Pre-Modification Outstanding Recorded Investment | $ 0 |  | $ 441 |
Post-Modification Outstanding Recorded Investment | 0 |  | 436 |
Specific Reserves | $ 0 |  | $ 26 |
Home equity line of credit |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | loan | 0 |  | 0 |
Pre-Modification Outstanding Recorded Investment | $ 0 |  | $ 0 |
Post-Modification Outstanding Recorded Investment | 0 |  | 0 |
Specific Reserves | $ 0 |  | $ 0 |
Consumer |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | loan | 0 |  | 0 |
Pre-Modification Outstanding Recorded Investment | $ 0 |  | $ 0 |
Post-Modification Outstanding Recorded Investment | 0 |  | 0 |
Specific Reserves | $ 0 |  | $ 0 |

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