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Allowance for Loan Losses - Credit quality of the loan portfolio (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	$ 937,702,000	$ 878,307,000
Total Past Due	4,078,000	4,399,000
Total loans	941,780,000	882,706,000
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	2,040,000	2,490,000
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	1,039,000	887,000
90 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	999,000	1,022,000
Commercial and Industrial
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total loans	152,636,000
Paycheck Protection Program (PPP)
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total loans	68,460,000
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	90,819,000
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	378,858,000
Commercial
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total loans	690,773,000	629,212,000
Commercial | Commercial and Industrial
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	152,558,000	173,922,000
Total Past Due	78,000	0
Total loans	152,636,000	173,922,000
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	78,000	0
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	0
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	68,460,000
Total Past Due	0
Total loans	68,460,000
90 Days Past Due and Still Accruing	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
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
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
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	90,819,000	91,538,000
Total Past Due	0	117,000
Total loans	90,819,000	91,655,000
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	0	117,000
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	378,858,000	363,635,000
Total Past Due	0	0
Total loans	378,858,000	363,635,000
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	0
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	0
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	251,007,000	253,494,000
Consumer | Real estate-residential mortgage
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	229,851,000	231,022,000
Total Past Due	3,960,000	4,217,000
Total loans	233,811,000	235,239,000
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	1,922,000	2,331,000
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	1,039,000	864,000
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	999,000	1,022,000
Consumer | Consumer [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	17,156,000	18,190,000
Total Past Due	40,000	65,000
Total loans	17,196,000	18,255,000
90 Days Past Due and Still Accruing	0	0
Consumer | Consumer [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	40,000	42,000
Consumer | Consumer [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	23,000
Consumer | Consumer [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

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