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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Basic      
Net income to common stockholders $ 109,768 $ 62,323 $ 58,544
Weighted average common shares outstanding (in shares) 24,736,713 24,387,932 25,941,395
Basic earnings per common share (in dollars per share) $ 4.44 $ 2.56 $ 2.26
Diluted      
Net income to common stockholders $ 109,768 $ 62,323 $ 58,544
Weighted average common shares outstanding (in shares) 24,736,713 24,387,932 25,941,395
Dilutive effects of:      
Average shares and dilutive potential common shares (in shares) 25,252,052 24,615,816 26,060,005
Diluted earnings per common share (in dollars per share) $ 4.35 $ 2.53 $ 2.25
Stock Options      
Dilutive effects of:      
Stock based compensation (in shares) 130,198 64,104 63,808
Restricted Stock Awards      
Dilutive effects of:      
Stock based compensation (in shares) 170,276 86,498 47,242
Restricted Stock Units      
Dilutive effects of:      
Stock based compensation (in shares) 76,049 25,978 3,441
Market Based Performance Stock Units (Market Based PSUs)      
Dilutive effects of:      
Stock based compensation (in shares) 136,199 51,304 4,119
Performance Stock Units - Performance Based      
Dilutive effects of:      
Stock based compensation (in shares) 0 0 0
Employee Stock Purchase Plan      
Dilutive effects of:      
Stock based compensation (in shares) 2,617 0 0