Allowance for Loan Losses (Details 6) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	$ 858,791	$ 856,020
Past Due	3,724	6,262
Total loans	862,515	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
Past Due	2,385	4,384
60-89 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Past Due	754	502
90 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Past Due	585	1,376
Commercial And Industrial [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	157,555	158,279
Past Due	0	0
Total loans	157,555	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
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
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
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	86,934	91,905
Past Due	0	0
Total loans	86,934	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
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
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
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	365,281	355,963
Past Due	0	580
Total loans	365,281	356,543
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
Past Due	0	580
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
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
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	231,558	232,465
Past Due	3,551	5,499
Total loans	235,109	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
Past Due	2,213	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
Past Due	753	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
Past Due	585	1,376
Consumer [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Current	17,463	17,408
Past Due	173	183
Total loans	17,636	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
Past Due	172	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
Past Due	1	30
Consumer [Member] | 90 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans
Past Due	$ 0	$ 0