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Allowance for Loan Losses - Commercial and commercial real estate loan portfolios (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | $ 872,649 | $ 882,706
Commercial |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | 624,487 | 629,212
Commercial and Industrial Loan [Member] | Commercial |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | 166,911 | 173,922
Commercial and Industrial [Member] |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | 166,911 | 173,922
Commercial loans secured by owner occupied real estate [Member] |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | 87,310 | 91,655
Commercial loans secured by owner occupied real estate [Member] | Commercial |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | 87,310 | 91,655
Commercial loans secured by non-owner occupied real estate [Member] |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | 370,266 | 363,635
Commercial loans secured by non-owner occupied real estate [Member] | Commercial |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | 370,266 | 363,635
Pass [Member] | Commercial |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | 607,798 | 612,116
Pass [Member] | Commercial and Industrial Loan [Member] | Commercial |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | 154,456 | 161,147
Pass [Member] | Commercial loans secured by owner occupied real estate [Member] | Commercial |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | 84,661 | 88,942
Pass [Member] | Commercial loans secured by non-owner occupied real estate [Member] | Commercial |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | 368,681 | 362,027
Special Mention [Member] | Commercial |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | 2,135 | 2,237
Special Mention [Member] | Commercial and Industrial Loan [Member] | Commercial |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | 790 | 853
Special Mention [Member] | Commercial loans secured by owner occupied real estate [Member] | Commercial |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | 1,345 | 1,384
Substandard [Member] | Commercial |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | 14,546 | 14,851
Substandard [Member] | Commercial and Industrial Loan [Member] | Commercial |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | 11,665 | 11,922
Substandard [Member] | Commercial loans secured by owner occupied real estate [Member] | Commercial |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | 1,304 | 1,329
Substandard [Member] | Commercial loans secured by non-owner occupied real estate [Member] | Commercial |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | 1,577 | 1,600
Doubtful [Member] | Commercial |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | 8 | 8
Doubtful [Member] | Commercial and Industrial Loan [Member] | Commercial |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | 0 | 0
Doubtful [Member] | Commercial loans secured by owner occupied real estate [Member] | Commercial |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | 0 | 0
Doubtful [Member] | Commercial loans secured by non-owner occupied real estate [Member] | Commercial |  |
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system |  |
Loan portfolio | $ 8 | $ 8

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