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Allowance for Loan Losses (Details 4) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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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 | $ 883,333 | $ 889,633
Commercial Portfolio Segment [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 | 624,648 | 622,972
Commercial and Industrial [Member] | Commercial Portfolio Segment [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 | 165,522 | 159,192
Commercial loans secured by owner occupied real estate [Member] | Commercial Portfolio Segment [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 | 95,594 | 89,935
Commercial loans secured by non-owner occupied real estate [Member] | Commercial Portfolio Segment [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 | 363,532 | 373,845
Pass [Member] | Commercial Portfolio Segment [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 | 603,296 | 606,468
Pass [Member] | Commercial and Industrial [Member] | Commercial Portfolio Segment [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 | 155,787 | 156,448
Pass [Member] | Commercial loans secured by owner occupied real estate [Member] | Commercial Portfolio Segment [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 | 90,629 | 87,215
Pass [Member] | Commercial loans secured by non-owner occupied real estate [Member] | Commercial Portfolio Segment [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 | 356,880 | 362,805
Special Mention [Member] | Commercial Portfolio Segment [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 | 18,194 | 12,328
Special Mention [Member] | Commercial and Industrial [Member] | Commercial Portfolio Segment [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 | 7,985 | 500
Special Mention [Member] | Commercial loans secured by owner occupied real estate [Member] | Commercial Portfolio Segment [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 | 3,836 | 1,675
Special Mention [Member] | Commercial loans secured by non-owner occupied real estate [Member] | Commercial Portfolio Segment [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 | 6,373 | 10,153
Substandard [Member] | Commercial Portfolio Segment [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 | 3,147 | 3,633
Substandard [Member] | Commercial and Industrial [Member] | Commercial Portfolio Segment [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 | 1,750 | 2,000
Substandard [Member] | Commercial loans secured by owner occupied real estate [Member] | Commercial Portfolio Segment [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 | 1,129 | 759
Substandard [Member] | Commercial loans secured by non-owner occupied real estate [Member] | Commercial Portfolio Segment [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 | 268 | 874
Doubtful [Member] | Commercial Portfolio Segment [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 | 11 | 543
Doubtful [Member] | Commercial and Industrial [Member] | Commercial Portfolio Segment [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 | 0 | 244
Doubtful [Member] | Commercial loans secured by owner occupied real estate [Member] | Commercial Portfolio Segment [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 | 0 | 286
Doubtful [Member] | Commercial loans secured by non-owner occupied real estate [Member] | Commercial Portfolio Segment [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 | $ 11 | $ 13

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