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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share [Abstract]        
Net income $ 34,915 $ 25,821 $ 104,638 $ 72,763
Average Common Shares:        
Basic (weighted-average outstanding shares) (in shares) 11,928 11,883 11,916 11,875
Dilutive potential common shares from stock options (in shares) 68 58 67 57
Diluted (weighted-average outstanding shares) (in shares) 11,996 11,941 11,983 11,932
Basic earnings per share (in dollars per share) $ 2.93 $ 2.18 $ 8.78 $ 6.13
Diluted earnings per share (in dollars per share) $ 2.91 $ 2.16 $ 8.73 $ 6.10