Earnings Per Share - Calculation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Net income	$ 32,120	$ 33,349
Average Common Shares:
Basic (weighted-average outstanding shares) (in shares)	11,944	11,899
Dilutive potential common shares from stock options (in shares)	76	63
Diluted (weighted-average outstanding shares) (in shares)	12,020	11,962
Basic earnings per share (in dollars per share)	$ 2.69	$ 2.80
Diluted earnings per share (in dollars per share)	$ 2.67	$ 2.79