Net Income per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Net Income per Share
Net income	$ 9,950	$ 9,700	$ 10,287	$ 9,942	$ 9,451	$ 9,108	$ 29,937	$ 28,501
Weighted average common shares outstanding - Basic (in shares)	10,128			10,522			10,255	10,491
Plus: Potential dilutive common stock equivalents (in shares)	130			192			126	203
Weighted average common shares outstanding - Diluted (in shares)	10,258			10,714			10,381	10,694
Net income per common share - Basic	$ 0.98			$ 0.94			$ 2.92	$ 2.72
Net income per common share - Diluted	$ 0.97			$ 0.93			$ 2.88	$ 2.67