Loans and Allowance for Loan Losses (Average Recorded Investment and Interest Income Recognized on Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	$ 13,238	$ 13,084	$ 13,551	$ 13,211	$ 13,084
Recognized interest income	177	166	542	532	733
Commercial Loan [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	8,543	8,799	8,647	8,893	8,527
Recognized interest income	115	114	359	353	478
Commercial Loan [Member] | Owner Occupied Re [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	2,728	2,786	2,742	2,792	2,784
Recognized interest income	27	41	96	103	142
Commercial Loan [Member] | Non Owner Occupied Re [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	4,077	3,048	4,139	3,070	2,860
Recognized interest income	74	29	202	127	174
Commercial Loan [Member] | Business Loan [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	1,738	2,965	1,766	3,031	2,883
Recognized interest income	14	44	61	123	162
Commercial Loan [Member] | Construction Loans [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment
Recognized interest income
Consumer Loan [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	4,695	4,285	4,904	4,318	4,557
Recognized interest income	62	52	183	179	255
Consumer Loan [Member] | Other Consumer [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	151	162	154	164	174
Recognized interest income	2	1	4	4	5
Consumer Loan [Member] | Construction Loans [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment
Recognized interest income
Consumer Loan [Member] | Real Estate Loan [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	2,876	2,850	3,062	2,871	2,930
Recognized interest income	30	34	97	114	151
Consumer Loan [Member] | Home Equity Loan [Member]
Average recorded investment and interest income recognized on impaired loans
Average recorded investment	1,668	1,273	1,688	1,283	1,453
Recognized interest income	$ 30	$ 17	$ 82	$ 61	$ 99