Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																								12 Months Ended
	Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2016		Sep. 30, 2016		Jun. 30, 2016		Mar. 31, 2016		Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income									$ 2,022		$ 1,963		$ 1,738		$ 1,608		$ 1,528		$ 1,283		$ 1,711		$ 1,821		$ 7,208	$ 7,331	$ 6,343
Less: dividends paid and accrued on preferred stock																							(23)				(23)
Net income available to common shareholders	$ (459)		$ 2,782		$ 2,543		$ 2,342										$ 1,528		$ 1,283		$ 1,711		$ 1,798		$ 7,208	$ 7,331	$ 6,320
Average number of common shares outstanding																									4,627,776	4,599,502	4,676,748
Dilutive effect of common stock equivalents																									1,452
Average number of shares used to calculate diluted EPS																									4,629,228	4,599,502	4,676,748
Earnings Per Share, Basic	$ (0.10)	[1]	$ 0.60	[1]	$ 0.55	[1]	$ 0.51	[1]	$ 0.44	[1]	$ 0.43	[1]	$ 0.38	[1]	$ 0.35	[1]	$ 0.33	[1]	$ 0.28	[1]	$ 0.37	[1]	$ 0.38	[1]	$ 1.56	$ 1.59	$ 1.36
Earnings Per Share, Diluted	$ (0.10)	[1]	$ 0.60	[1]	$ 0.55	[1]	$ 0.51	[1]	$ 0.44	[1]	$ 0.42	[1]	$ 0.38	[1]	$ 0.35	[1]	$ 0.33	[1]	$ 0.27	[1]	$ 0.37	[1]	$ 0.38	[1]	$ 1.56	$ 1.59	$ 1.35

[1] Earnings per share are based upon quarterly results and, when added, may not total the annual earnings per share amounts.