Earnings Per Share - Calculation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net income	$ 36,374	$ 28,472	$ 69,723	$ 46,942
Average Common Shares:
Basic (weighted-average outstanding shares) (in shares)	11,921	11,880	11,910	11,870
Dilutive potential common shares from stock options (in shares)	72	58	67	57
Diluted (weighted-average outstanding shares) (in shares)	11,993	11,938	11,977	11,927
Basic earnings per share (in dollars per share)	$ 3.05	$ 2.39	$ 5.85	$ 3.95
Diluted earnings per share (in dollars per share)	$ 3.03	$ 2.39	$ 5.82	$ 3.94