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Allowance for Loan Losses - Commercial and commercial real estate loan portfolios (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
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 | $ 869,133 | $ 862,282
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 | 612,808 | 606,727
Commercial and Industrial Loan [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 | 163,385 | 158,279
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 | 163,385 | 158,279
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 | 82,378 | 91,905
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 | 82,378 | 91,905
Commercial Loans Secured by Nonowner 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 | 367,045 | 356,543
Commercial Loans Secured by Nonowner 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 | 367,045 | 356,543
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 | 590,446 | 591,461
Pass [Member] | Commercial and Industrial Loan [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 | 150,113 | 154,510
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 | 79,601 | 86,997
Pass [Member] | Commercial Loans Secured by Nonowner 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 | 360,732 | 349,954
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 | 15,746 | 12,174
Special Mention [Member] | Commercial and Industrial Loan [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 | 9,640 | 2,089
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 | 1,422 | 3,769
Special Mention [Member] | Commercial Loans Secured by Nonowner 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 | 4,684 | 6,316
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 | 6,607 | 3,081
Substandard [Member] | Commercial and Industrial Loan [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 | 3,632 | 1,680
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 | 1,355 | 1,139
Substandard [Member] | Commercial Loans Secured by Nonowner 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 | 1,620 | 262
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 | 9 | 11
Doubtful [Member] | Commercial and Industrial Loan [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 | 0
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 | 0
Doubtful [Member] | Commercial Loans Secured by Nonowner 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 | $ 9 | $ 11

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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 + Details
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