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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with Allowance: Average Recorded Investment | $ 74 | $ 434 | $ 0 | $ 852
Impaired Loans with Allowance: Interest Income | 0 | 0 | 0 | 0
Impaired Loans with No Allowance: Average Recorded Investment | 6,795 | 7,465 | 6,963 | 7,860
Impaired Loans with No Allowance: Interest Income | 261 | 79 | 318 | 126
Commercial and industrial |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with Allowance: Average Recorded Investment | 0 | 434 | 0 | 726
Impaired Loans with Allowance: Interest Income | 0 | 0 | 0 | 0
Impaired Loans with No Allowance: Average Recorded Investment | 0 | 89 | 0 | 122
Impaired Loans with No Allowance: Interest Income | 0 | 44 | 0 | 44
Commercial real estate |  |  |  |
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 | 6,201 | 7,275 | 6,388 | 7,637
Impaired Loans with No Allowance: Interest Income | 261 | 35 | 318 | 82
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 | 0
Impaired Loans with No Allowance: Interest Income | 0 | 0 | 0 | 0
Residential mortgage |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with Allowance: Average Recorded Investment | 0 | 0 | 0 | 126
Impaired Loans with Allowance: Interest Income | 0 | 0 | 0 | 0
Impaired Loans with No Allowance: Average Recorded Investment | 594 | 101 | 575 | 101
Impaired Loans with No Allowance: Interest Income | 0 | $ 0 | 0 | $ 0
Home equity lines of credit |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with Allowance: Average Recorded Investment | 74 |  | 0 |
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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