Loans and Allowance for Loan Losses (Details 8) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	$ 13,084	$ 12,735	$ 13,211	$ 13,030	$ 13,019
Recognized interest income	166	183	532	478	637
Commercial [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	8,799	10,002	8,893	10,286	9,222
Recognized interest income	114	140	353	397	465
Commercial [Member] | Owner occupied RE [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	2,786	2,182	2,792	2,198	2,255
Recognized interest income	41	25	103	78	104
Commercial [Member] | Non-owner occupied RE [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	3,048	4,322	3,070	4,503	4,144
Recognized interest income	29	57	127	154	199
Commercial [Member] | Business [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	2,965	3,498	3,031	3,585	2,823
Recognized interest income	44	58	123	165	162
Commercial [Member] | Construction [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment
Recognized interest income
Consumer [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	4,285	2,733	4,318	2,744	3,797
Recognized interest income	52	43	179	81	172
Consumer [Member] | Other [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	162	176	164	178	174
Recognized interest income	1	1	4	4	6
Consumer [Member] | Real estate [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	2,850	2,361	2,871	2,370	2,047
Recognized interest income	34	40	114	73	69
Consumer [Member] | Home equity [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	1,273	196	1,283	196	1,576
Recognized interest income	17	2	61	4	97
Consumer [Member] | Construction [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment
Recognized interest income