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Allowance for Loan Losses - Commercial and commercial real estate loan portfolios (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
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	$ 996,029	$ 972,095
Paycheck Protection Program (PPP)
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	29,260	58,344
Commercial loans secured by owner occupied real estate
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	100,028	95,486
Commercial loans secured by non-owner occupied real estate
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	432,529	400,751
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	698,708	705,743
Commercial | Commercial and industrial
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	136,891	151,162
Commercial | Paycheck Protection Program (PPP)
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	29,260	58,344
Commercial | Commercial loans secured by owner occupied real estate
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	100,028	95,486
Commercial | Commercial loans secured by non-owner occupied real estate
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	432,529	400,751
Commercial | Pass
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	654,047	656,534
Commercial | Pass | Commercial and industrial
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	127,234	134,186
Commercial | Pass | Paycheck Protection Program (PPP)
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	29,260	58,344
Commercial | Pass | Commercial loans secured by owner occupied real estate
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	97,999	92,189
Commercial | Pass | Commercial loans secured by non-owner occupied real estate
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	399,554	371,815
Commercial | Special Mention
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	31,677	39,856
Commercial | Special Mention | Commercial and industrial
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	7,294	13,722
Commercial | Special Mention | Commercial loans secured by owner occupied real estate
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	915	2,154
Commercial | Special Mention | Commercial loans secured by non-owner occupied real estate
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	23,468	23,980
Commercial | Substandard
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	11,305	9,345
Commercial | Substandard | Commercial and industrial
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	690	3,254
Commercial | Substandard | Commercial loans secured by owner occupied real estate
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	1,114	1,143
Commercial | Substandard | Commercial loans secured by non-owner occupied real estate
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	9,501	4,948
Commercial | Doubtful
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	1,679	8
Commercial | Doubtful | Commercial and industrial
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	1,673
Commercial | Doubtful | Commercial loans secured by non-owner occupied real estate
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	8
Paycheck Protection Program (PPP)
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	$ 29,260	$ 58,344

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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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-Publisher FASB
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-Topic 310
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-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524

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