Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income	$ 2,329	$ 1,551	$ 5,840	$ 4,288
Denominator:
Weighted average common shares outstanding (basic)	17,924	18,380	18,013	18,590
Effect of stock options	112	101	104	99
Weighted average common shares outstanding (diluted)	18,036	18,481	18,117	18,689
Earnings per common share:
Basic	$ 0.13	$ 0.08	$ 0.32	$ 0.23
Diluted	$ 0.13	$ 0.08	$ 0.32	$ 0.23