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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Earnings Per Share [Abstract]      
Net income $ 136,161 $ 101,928 $ 80,245
Average common shares:      
Basic (weighted-average outstanding shares) (in shares) 11,920,000 11,877,000 11,837,000
Dilutive potential common shares from stock options (in shares) 67,000 57,000 59,000
Diluted (weighted-average outstanding shares) (in shares) 11,987,000 11,934,000 11,896,000
Basic earnings per share (in dollars per share) $ 11.42 $ 8.58 $ 6.78
Diluted earnings per share (in dollars per share) $ 11.36 $ 8.54 $ 6.75
Stock options excluded from diluted earnings per share calculation (in shares) 4,991 25,610 15,586