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Allowance for Loan Losses - Credit quality of the loan portfolio (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	$ 913,410,000	$ 878,307,000
Total Past Due	6,751,000	4,399,000
Total loans	920,161,000	882,706,000
90 Days Past Due and Still Accruing	1,581,000	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	1,849,000	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	1,806,000	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	3,096,000	1,022,000
Commercial and Industrial
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total loans	154,379,000	173,922,000
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	86,080,000	91,655,000
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	365,250,000	363,635,000
Real estate-residential mortgage
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total loans	230,509,000	235,239,000
Consumer [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total loans	17,010,000	18,255,000
Commercial
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total loans	672,642,000	629,212,000
Commercial | Commercial and Industrial
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	221,251,000	173,922,000
Total Past Due	61,000	0
Total loans	221,312,000	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	40,000	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	21,000	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 | 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	85,267,000	91,538,000
Total Past Due	813,000	117,000
Total loans	86,080,000	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	813,000	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	365,250,000	363,635,000
Total Past Due	0	0
Total loans	365,250,000	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	247,519,000	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	224,654,000	231,022,000
Total Past Due	5,855,000	4,217,000
Total loans	230,509,000	235,239,000
90 Days Past Due and Still Accruing	1,581,000	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	1,792,000	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	967,000	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	3,096,000	1,022,000
Consumer | Consumer [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	16,988,000	18,190,000
Total Past Due	22,000	65,000
Total loans	17,010,000	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	17,000	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	5,000	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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