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Allowance for Loan Losses - Credit quality of the loan portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	$ 865,760	$ 856,020
Total Past Due	3,373	6,262
Total loans	869,133	862,282
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	1,937	4,384
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	1,003	502
90 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Total Past Due	433	1,376
Commercial and Industrial [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	163,385	158,279
Total Past Due	0	0
Total loans	163,385	158,279
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	0	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	82,378	91,905
Total Past Due	0	0
Total loans	82,378	91,905
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	0	0
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 Nonowner Occupied Real Estate[Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	367,045	355,963
Total Past Due	0	580
Total loans	367,045	356,543
90 Days Past Due and Still Accruing	0	0
Commercial Loans Secured by Nonowner 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	580
Commercial Loans Secured by Nonowner 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 Nonowner 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
Real estate - residential mortgage [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	234,832	232,465
Total Past Due	3,308	5,499
Total loans	238,140	237,964
90 Days Past Due and Still Accruing	0	0
Real estate - residential mortgage [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	1,892	3,651
Real estate - residential mortgage [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	983	472
Real estate - residential mortgage [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	433	1,376
Consumer [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	18,120	17,408
Total Past Due	65	183
Total loans	18,185	17,591
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	45	153
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	20	30
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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