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Earnings Per Share - Factors Used in Computation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Basic      
Net income to common stockholders $ 99,105 $ 109,768 $ 62,323
Weighted average common shares outstanding (in shares) 24,393,954 24,736,713 24,387,932
Basic earnings per common share (in dollars per share) $ 4.06 $ 4.44 $ 2.56
Diluted      
Net income to common stockholders $ 99,105 $ 109,768 $ 62,323
Weighted average common shares outstanding (in shares) 24,393,954 24,736,713 24,387,932
Dilutive effects of:      
Average shares and dilutive potential common shares (in shares) 25,023,568 25,252,052 24,615,816
Diluted earnings per common share (in dollars per share) $ 3.96 $ 4.35 $ 2.53
Stock options      
Dilutive effects of:      
Stock based compensation (in shares) 90,841 130,198 64,104
Restricted stock awards      
Dilutive effects of:      
Stock based compensation (in shares) 148,630 170,276 86,498
Restricted stock units      
Dilutive effects of:      
Stock based compensation (in shares) 98,139 76,049 25,978
Performance stock units - market based      
Dilutive effects of:      
Stock based compensation (in shares) 122,123 136,199 51,304
Performance stock units - performance based      
Dilutive effects of:      
Stock based compensation (in shares) 167,187 0 0
Employee stock purchase plan      
Dilutive effects of:      
Stock based compensation (in shares) 2,694 2,617 0