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Allowance for Loan Losses - Credit quality of the loan portfolio (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	$ 982,208,000	$ 964,256,000
Total Past Due	3,041,000	7,839,000
Total loans	985,249,000	972,095,000
90 Days Past Due and Still Accruing	0	0
30-59 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	2,027,000	1,624,000
60-89 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	23,000	4,452,000
90 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	991,000	1,763,000
Commercial and Industrial
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total loans	143,803,000	151,162,000
Paycheck Protection Program (PPP)
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total loans	67,253,000	58,344,000
Commercial loans secured by owner occupied real estate [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total loans	95,357,000	95,486,000
Commercial loans secured by non-owner occupied real estate
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total loans	407,432,000	400,751,000
Real estate-residential mortgage
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total loans	255,319,000	249,989,000
Consumer.
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total loans	16,085,000	16,363,000
Commercial
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total loans	713,845,000	705,743,000
Commercial | Commercial and Industrial
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	143,803,000	148,023,000
Total Past Due	0	3,139,000
Total loans	143,803,000	151,162,000
90 Days Past Due and Still Accruing	0	0
Commercial | Commercial and Industrial | 30-59 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	0	536,000
Commercial | Commercial and Industrial | 60-89 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	0	2,603,000
Commercial | Commercial and Industrial | 90 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	0	0
Commercial | Paycheck Protection Program (PPP)
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	67,253,000	58,344,000
Total Past Due	0	0
Total loans	67,253,000	58,344,000
90 Days Past Due and Still Accruing	0	0
Commercial | Paycheck Protection Program (PPP) | 30-59 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	0	0
Commercial | Paycheck Protection Program (PPP) | 60-89 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	0	0
Commercial | Paycheck Protection Program (PPP) | 90 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	0	0
Commercial | Commercial loans secured by owner occupied real estate [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	95,266,000	95,486,000
Total Past Due	91,000	0
Total loans	95,357,000	95,486,000
90 Days Past Due and Still Accruing	0	0
Commercial | Commercial loans secured by owner occupied real estate [Member] | 30-59 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	91,000	0
Commercial | Commercial loans secured by owner occupied real estate [Member] | 60-89 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	0	0
Commercial | Commercial loans secured by owner occupied real estate [Member] | 90 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	0	0
Commercial | Commercial loans secured by non-owner occupied real estate
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	407,432,000	399,850,000
Total Past Due	0	901,000
Total loans	407,432,000	400,751,000
90 Days Past Due and Still Accruing	0	0
Commercial | Commercial loans secured by non-owner occupied real estate | 30-59 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	0	230,000
Commercial | Commercial loans secured by non-owner occupied real estate | 60-89 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	0	671,000
Commercial | Commercial loans secured by non-owner occupied real estate | 90 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	0	0
Consumer
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total loans	271,404,000	266,352,000
Consumer | Real estate-residential mortgage
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	252,395,000	246,279,000
Total Past Due	2,924,000	3,710,000
Total loans	255,319,000	249,989,000
90 Days Past Due and Still Accruing	0	0
Consumer | Real estate-residential mortgage | 30-59 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	1,918,000	776,000
Consumer | Real estate-residential mortgage | 60-89 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	22,000	1,178,000
Consumer | Real estate-residential mortgage | 90 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	984,000	1,756,000
Consumer | Consumer.
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	16,059,000	16,274,000
Total Past Due	26,000	89,000
Total loans	16,085,000	16,363,000
90 Days Past Due and Still Accruing	0	0
Consumer | Consumer. | 30-59 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	18,000	82,000
Consumer | Consumer. | 60-89 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	1,000	0
Consumer | Consumer. | 90 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	$ 7,000	$ 7,000

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