Allowance for Loan Losses (Details 4) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system
Loan portfolio	$ 883,333	$ 889,633
Commercial Portfolio Segment [Member]
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system
Loan portfolio	624,648	622,972
Commercial and Industrial [Member] | Commercial Portfolio Segment [Member]
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system
Loan portfolio	165,522	159,192
Commercial loans secured by owner occupied real estate [Member] | Commercial Portfolio Segment [Member]
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system
Loan portfolio	95,594	89,935
Commercial loans secured by non-owner occupied real estate [Member] | Commercial Portfolio Segment [Member]
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system
Loan portfolio	363,532	373,845
Pass [Member] | Commercial Portfolio Segment [Member]
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system
Loan portfolio	603,296	606,468
Pass [Member] | Commercial and Industrial [Member] | Commercial Portfolio Segment [Member]
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system
Loan portfolio	155,787	156,448
Pass [Member] | Commercial loans secured by owner occupied real estate [Member] | Commercial Portfolio Segment [Member]
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system
Loan portfolio	90,629	87,215
Pass [Member] | Commercial loans secured by non-owner occupied real estate [Member] | Commercial Portfolio Segment [Member]
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system
Loan portfolio	356,880	362,805
Special Mention [Member] | Commercial Portfolio Segment [Member]
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system
Loan portfolio	18,194	12,328
Special Mention [Member] | Commercial and Industrial [Member] | Commercial Portfolio Segment [Member]
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system
Loan portfolio	7,985	500
Special Mention [Member] | Commercial loans secured by owner occupied real estate [Member] | Commercial Portfolio Segment [Member]
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system
Loan portfolio	3,836	1,675
Special Mention [Member] | Commercial loans secured by non-owner occupied real estate [Member] | Commercial Portfolio Segment [Member]
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system
Loan portfolio	6,373	10,153
Substandard [Member] | Commercial Portfolio Segment [Member]
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system
Loan portfolio	3,147	3,633
Substandard [Member] | Commercial and Industrial [Member] | Commercial Portfolio Segment [Member]
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system
Loan portfolio	1,750	2,000
Substandard [Member] | Commercial loans secured by owner occupied real estate [Member] | Commercial Portfolio Segment [Member]
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system
Loan portfolio	1,129	759
Substandard [Member] | Commercial loans secured by non-owner occupied real estate [Member] | Commercial Portfolio Segment [Member]
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system
Loan portfolio	268	874
Doubtful [Member] | Commercial Portfolio Segment [Member]
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system
Loan portfolio	11	543
Doubtful [Member] | Commercial and Industrial [Member] | Commercial Portfolio Segment [Member]
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system
Loan portfolio	0	244
Doubtful [Member] | Commercial loans secured by owner occupied real estate [Member] | Commercial Portfolio Segment [Member]
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system
Loan portfolio	0	286
Doubtful [Member] | Commercial loans secured by non-owner occupied real estate [Member] | Commercial Portfolio Segment [Member]
Loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard and Doubtful within the internal risk rating system
Loan portfolio	$ 11	$ 13