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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings Per Share [Abstract]        
Net income $ 28,472 $ 26,037 $ 46,942 $ 43,499
Average Common Shares:        
Basic (weighted-average outstanding shares) (in shares) 11,880 11,842 11,870 11,831
Dilutive potential common shares from stock options (in shares) 58 60 57 61
Diluted (weighted-average outstanding shares) (in shares) 11,938 11,902 11,927 11,892
Basic earnings per share (in dollars per share) $ 2.39 $ 2.20 $ 3.95 $ 3.68
Diluted earnings per share (in dollars per share) $ 2.39 $ 2.19 $ 3.94 $ 3.66