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Allowance for Loan Losses - Credit quality of the loan portfolio (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	$ 862,446	$ 878,307
Total Past Due	10,203	4,399
Total loans	872,649	882,706
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	7,961	2,490
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	1,271	887
90 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	971	1,022
Commercial and Industrial [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	160,550	173,922
Total Past Due	6,361	0
Total loans	166,911	173,922
90 Days Past Due and Still Accruing	0	0
Commercial and Industrial [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	6,361	0
Commercial and Industrial [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 and Industrial [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 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	87,197	91,538
Total Past Due	113	117
Total loans	87,310	91,655
90 Days Past Due and Still Accruing	0	0
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	113	117
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 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 loans secured by non-owner occupied real estate [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	370,266	363,635
Total Past Due	0	0
Total loans	370,266	363,635
90 Days Past Due and Still Accruing	0	0
Commercial loans secured by non-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	0
Commercial loans secured by non-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 loans secured by non-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
Residential Mortgage
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	226,532	231,022
Total Past Due	3,675	4,217
Total loans	230,207	235,239
90 Days Past Due and Still Accruing	0	0
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	1,445	2,331
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	1,259	864
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	971	1,022
Consumer [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	17,901	18,190
Total Past Due	54	65
Total loans	17,955	18,255
90 Days Past Due and Still Accruing	0	0
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	42	42
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	12	23
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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