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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
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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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
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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524

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