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Loans - Summary of Average of Impaired Loans and Related Interest Income by Loan Portfolio Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with Allowance: Average Recorded Investment | $ 74 | $ 2,570 | $ 676 | $ 1,945
Impaired Loans with Allowance: Interest Income | 0 | 0 | 0 | 0
Impaired Loans with No Allowance: Average Recorded Investment | 7,532 | 8,461 | 7,826 | 9,402
Impaired Loans with No Allowance: Interest Income | 36 | 80 | 162 | 333
Commercial and industrial |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with Allowance: Average Recorded Investment | 0 | 1,360 | 545 | 1,152
Impaired Loans with Allowance: Interest Income | 0 | 0 | 0 | 0
Impaired Loans with No Allowance: Average Recorded Investment | 0 | 734 | 92 | 934
Impaired Loans with No Allowance: Interest Income | 0 | 0 | 44 | 0
Commercial real estate |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with Allowance: Average Recorded Investment | 0 | 832 | 0 | 416
Impaired Loans with Allowance: Interest Income | 0 | 0 | 0 | 0
Impaired Loans with No Allowance: Average Recorded Investment | 7,215 | 7,626 | 7,525 | 8,155
Impaired Loans with No Allowance: Interest Income | 36 | 80 | 118 | 293
Commercial real estate construction |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with Allowance: Average Recorded Investment | 0 | 0 | 0 | 0
Impaired Loans with Allowance: Interest Income | 0 | 0 | 0 | 0
Impaired Loans with No Allowance: Average Recorded Investment | 0 | 0 | 0 | 75
Impaired Loans with No Allowance: Interest Income | 0 | 0 | 0 | 25
Residential mortgage |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with Allowance: Average Recorded Investment | 0 | 378 | 94 | 377
Impaired Loans with Allowance: Interest Income | 0 | 0 | 0 | 0
Impaired Loans with No Allowance: Average Recorded Investment | 317 | 101 | 209 | 238
Impaired Loans with No Allowance: Interest Income | 0 | $ 0 | 0 | $ 15
Home equity lines of credit |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with Allowance: Average Recorded Investment | 74 |  | 37 |
Impaired Loans with Allowance: Interest Income | 0 |  | 0 |
Impaired Loans with No Allowance: Average Recorded Investment | 0 |  | 0 |
Impaired Loans with No Allowance: Interest Income | $ 0 |  | $ 0 |

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