Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Earnings per common share - basic
Net income	$ 4,277	$ 3,986
Average common shares outstanding (in shares)	2,197,440	2,146,130
Basic earnings per common share (in dollars per share)	$ 1.95	$ 1.86
Earnings per common share - diluted
Net income	$ 4,277	$ 3,986
Average common shares outstanding (in shares)	2,197,440	2,146,130
Add: Dilutive effects of assumed exercises of restricted stock and stock options (in shares)	17,128	5,971
Average shares and dilutive potential common shares (in shares)	2,214,568	2,152,101
Diluted earnings per common share (in dollars per share)	$ 1.93	$ 1.85
Stock options and restricted stock awards not considered in computing diluted earnings per share because they were antidilutive (in shares)	0	57,000