Net Income per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Net Income per Share
Net income	$ 9,451	$ 9,108	$ 8,418	$ 8,496	$ 18,559	$ 16,914
Weighted average common shares outstanding - Basic	10,504		10,427		10,475	10,432
Plus: Potential dilutive common stock equivalents (in shares)	202		142		210	135
Weighted average common shares outstanding - Diluted (in shares)	10,706		10,569		10,685	10,567
Net income per common share - Basic	$ 0.90		$ 0.81		$ 1.77	$ 1.62
Net income per common share - Diluted	$ 0.88		$ 0.80		$ 1.74	$ 1.60
Stock options and common stock excluded from the income per share calculation as their effect would have been anti-dilutive (in shares)			247			262