Earnings Per Share - Calculation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 25,821	$ 17,519	$ 72,763	$ 61,018
Average Common Shares:
Basic (weighted-average outstanding shares) (in shares)	11,883	11,842	11,875	11,835
Dilutive potential common shares from stock options (in shares)	58	58	57	60
Diluted (weighted-average outstanding shares) (in shares)	11,941	11,900	11,932	11,895
Basic earnings per share (in dollars per share)	$ 2.18	$ 1.48	$ 6.13	$ 5.16
Diluted earnings per share (in dollars per share)	$ 2.16	$ 1.47	$ 6.10	$ 5.13