Net Income per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 5,740	$ 5,229
Weighted average common shares outstanding - Basic (in shares)	10,801	10,678
Plus: Potential dilutive common stock equivalents (in shares)	154	175
Weighted average common shares outstanding - Diluted (in shares)	10,955	10,853
Net income per common share - Basic (in dollars per share)	$ 0.53	$ 0.49
Net income per common share - Diluted (in dollars per share)	$ 0.52	$ 0.48
Stock options and common stock excluded from the income per share calculation as their effect would have been anti-dilutive (in shares)	209	84