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Loans - Schedule of Classes of the Loan Portfolio Summarized by the Aggregate Risk Rating (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | $ 1,272,446 | $ 1,244,170 | $ 1,236,370
Pass |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 1,214,692 | 1,183,405 |
Special Mention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 41,304 | 42,084 |
Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 16,450 | 18,681 |
Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 176,073 | 165,829 | 169,037
Commercial and industrial | Pass |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 172,689 | 160,297 |
Commercial and industrial | Special Mention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 3,217 | 3,710 |
Commercial and industrial | Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 167 | 1,822 |
Commercial and industrial | Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 522,834 | 492,759 | 483,673
Commercial real estate | Pass |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 484,017 | 449,854 |
Commercial real estate | Special Mention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 26,834 | 30,400 |
Commercial real estate | Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 11,983 | 12,505 |
Commercial real estate | Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Commercial real estate construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 18,720 | 35,560 | 39,779
Commercial real estate construction | Pass |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 16,743 | 34,155 |
Commercial real estate construction | Special Mention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 1,728 | 1,155 |
Commercial real estate construction | Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 249 | 250 |
Commercial real estate construction | Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Residential mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 433,535 | 425,893 | 421,732
Residential mortgage | Pass |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 420,823 | 416,154 |
Residential mortgage | Special Mention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 9,202 | 6,013 |
Residential mortgage | Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 3,510 | 3,726 |
Residential mortgage | Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Home equity lines of credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 106,679 | 107,792 | 105,113
Home equity lines of credit | Pass |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 105,815 | 106,966 |
Home equity lines of credit | Special Mention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 323 | 448 |
Home equity lines of credit | Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 541 | 378 |
Home equity lines of credit | Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 14,605 | 16,337 | $ 17,036
Consumer | Pass |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 14,605 | 15,979 |
Consumer | Special Mention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 358 |
Consumer | Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Consumer | Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Originated Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 1,063,772 | 1,003,544 |
Originated Loans | Pass |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 1,024,673 | 966,217 |
Originated Loans | Special Mention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 29,461 | 25,510 |
Originated Loans | Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 9,638 | 11,817 |
Originated Loans | Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Originated Loans | Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 170,618 | 159,455 |
Originated Loans | Commercial and industrial | Pass |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 167,353 | 154,177 |
Originated Loans | Commercial and industrial | Special Mention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 3,094 | 3,466 |
Originated Loans | Commercial and industrial | Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 171 | 1,812 |
Originated Loans | Commercial and industrial | Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Originated Loans | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 390,621 | 351,945 |
Originated Loans | Commercial real estate | Pass |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 363,982 | 325,002 |
Originated Loans | Commercial real estate | Special Mention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 18,218 | 17,666 |
Originated Loans | Commercial real estate | Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 8,421 | 9,277 |
Originated Loans | Commercial real estate | Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Originated Loans | Commercial real estate construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 14,774 | 28,430 |
Originated Loans | Commercial real estate construction | Pass |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 13,520 | 27,413 |
Originated Loans | Commercial real estate construction | Special Mention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 1,005 | 767 |
Originated Loans | Commercial real estate construction | Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 249 | 250 |
Originated Loans | Commercial real estate construction | Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Originated Loans | Residential mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 385,859 | 366,924 |
Originated Loans | Residential mortgage | Pass |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 378,301 | 363,195 |
Originated Loans | Residential mortgage | Special Mention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 6,909 | 3,251 |
Originated Loans | Residential mortgage | Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 649 | 478 |
Originated Loans | Residential mortgage | Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Originated Loans | Home equity lines of credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 87,563 | 82,336 |
Originated Loans | Home equity lines of credit | Pass |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 87,180 | 81,976 |
Originated Loans | Home equity lines of credit | Special Mention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 235 | 360 |
Originated Loans | Home equity lines of credit | Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 148 | 0 |
Originated Loans | Home equity lines of credit | Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Originated Loans | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 14,337 | 14,454 |
Originated Loans | Consumer | Pass |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 14,337 | 14,454 |
Originated Loans | Consumer | Special Mention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Originated Loans | Consumer | Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Originated Loans | Consumer | Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Acquired Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 208,674 | 240,626 |
Acquired Loans | Pass |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 190,019 | 217,188 |
Acquired Loans | Special Mention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 11,843 | 16,574 |
Acquired Loans | Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 6,812 | 6,864 |
Acquired Loans | Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Acquired Loans | Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 5,455 | 6,374 |
Acquired Loans | Commercial and industrial | Pass |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 5,336 | 6,120 |
Acquired Loans | Commercial and industrial | Special Mention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 123 | 244 |
Acquired Loans | Commercial and industrial | Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | (4) | 10 |
Acquired Loans | Commercial and industrial | Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Acquired Loans | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 132,213 | 140,814 |
Acquired Loans | Commercial real estate | Pass |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 120,035 | 124,852 |
Acquired Loans | Commercial real estate | Special Mention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 8,616 | 12,734 |
Acquired Loans | Commercial real estate | Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 3,562 | 3,228 |
Acquired Loans | Commercial real estate | Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Acquired Loans | Commercial real estate construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 3,946 | 7,130 |
Acquired Loans | Commercial real estate construction | Pass |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 3,223 | 6,742 |
Acquired Loans | Commercial real estate construction | Special Mention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 723 | 388 |
Acquired Loans | Commercial real estate construction | Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Acquired Loans | Commercial real estate construction | Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Acquired Loans | Residential mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 47,676 | 58,969 |
Acquired Loans | Residential mortgage | Pass |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 42,522 | 52,959 |
Acquired Loans | Residential mortgage | Special Mention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 2,293 | 2,762 |
Acquired Loans | Residential mortgage | Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 2,861 | 3,248 |
Acquired Loans | Residential mortgage | Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Acquired Loans | Home equity lines of credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 19,116 | 25,456 |
Acquired Loans | Home equity lines of credit | Pass |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 18,635 | 24,990 |
Acquired Loans | Home equity lines of credit | Special Mention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 88 | 88 |
Acquired Loans | Home equity lines of credit | Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 393 | 378 |
Acquired Loans | Home equity lines of credit | Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Acquired Loans | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 268 | 1,883 |
Acquired Loans | Consumer | Pass |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 268 | 1,525 |
Acquired Loans | Consumer | Special Mention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 358 |
Acquired Loans | Consumer | Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 | 0 |
Acquired Loans | Consumer | Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | $ 0 | $ 0 |

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