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Allowance for Loan Losses (Details 4) - USD ($) $ in Thousands | Jun. 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 | $ 891,507 | $ 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 | 630,389 | 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 | 168,365 | 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 | 91,170 | 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 | 370,854 | 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 | 613,398 | 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 | 166,074 | 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 | 88,419 | 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 | 358,905 | 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 | 13,264 | 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 | 0 | 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 | 1,605 | 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 | 11,659 | 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 | 3,715 | 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 | 2,291 | 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 | 1,146 | 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 | 278 | 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 | 12 | 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 | $ 12 | $ 13

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