Loans and Allowance for Loan Losses (Details 7) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Summary of key information for impaired loans
Unpaid Principal Balance	$ 17,512	$ 17,086
Impaired loans	12,922	12,446
Impaired loans with related allowance for loan losses	9,349	7,990
Related allowance for loan losses	3,723	3,677
Commercial [Member]
Summary of key information for impaired loans
Unpaid Principal Balance	11,749	12,843
Impaired loans	7,807	8,664
Impaired loans with related allowance for loan losses	5,780	5,103
Related allowance for loan losses	1,852	1,990
Commercial [Member] | Owner occupied RE [Member]
Summary of key information for impaired loans
Unpaid Principal Balance	2,276	2,281
Impaired loans	2,227	2,235
Impaired loans with related allowance for loan losses	1,798	464
Related allowance for loan losses	180	179
Commercial [Member] | Non-owner occupied RE [Member]
Summary of key information for impaired loans
Unpaid Principal Balance	6,893	6,827
Impaired loans	3,717	3,665
Impaired loans with related allowance for loan losses	2,119	2,646
Related allowance for loan losses	729	750
Commercial [Member] | Business [Member]
Summary of key information for impaired loans
Unpaid Principal Balance	2,580	3,735
Impaired loans	1,863	2,764
Impaired loans with related allowance for loan losses	1,863	1,993
Related allowance for loan losses	943	1,061
Commercial [Member] | Construction [Member]
Summary of key information for impaired loans
Unpaid Principal Balance
Impaired loans
Impaired loans with related allowance for loan losses
Related allowance for loan losses
Consumer [Member]
Summary of key information for impaired loans
Unpaid Principal Balance	5,763	4,243
Impaired loans	5,115	3,782
Impaired loans with related allowance for loan losses	3,569	2,887
Related allowance for loan losses	1,871	1,687
Consumer [Member] | Other [Member]
Summary of key information for impaired loans
Unpaid Principal Balance	166	171
Impaired loans	166	170
Impaired loans with related allowance for loan losses	166	170
Related allowance for loan losses	20	22
Consumer [Member] | Real estate [Member]
Summary of key information for impaired loans
Unpaid Principal Balance	2,846	2,062
Impaired loans	2,795	2,037
Impaired loans with related allowance for loan losses	2,128	2,037
Related allowance for loan losses	1,285	1,379
Consumer [Member] | Home equity [Member]
Summary of key information for impaired loans
Unpaid Principal Balance	2,751	2,010
Impaired loans	2,154	1,575
Impaired loans with related allowance for loan losses	1,275	680
Related allowance for loan losses	566	286
Consumer [Member] | Construction [Member]
Summary of key information for impaired loans
Unpaid Principal Balance
Impaired loans
Impaired loans with related allowance for loan losses
Related allowance for loan losses