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Earnings Per Share - Factors Used in Computation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Basic        
Net income to common stockholders $ 6,848 $ 43,390 $ 17,057 $ 66,918
Weighted average common shares outstanding (in shares) 23,138,835 24,427,270 23,249,668 24,612,988
Basic earnings per common share (in dollars per share) $ 0.30 $ 1.78 $ 0.73 $ 2.72
Diluted        
Net income to common stockholders $ 6,848 $ 43,390 $ 17,057 $ 66,918
Weighted average common shares outstanding (in shares) 23,138,835 24,427,270 23,249,668 24,612,988
Dilutive effects of:        
Average shares and dilutive potential common shares (in shares) 23,455,471 24,866,573 23,634,343 25,122,985
Diluted earnings per common share (in dollars per share) $ 0.29 $ 1.74 $ 0.72 $ 2.66
Stock options        
Dilutive effects of:        
Stock based compensation (in shares) 71,658 89,443 73,884 99,402
Restricted stock awards        
Dilutive effects of:        
Stock based compensation (in shares) 90,645 144,526 113,930 189,492
Restricted stock units        
Dilutive effects of:        
Stock based compensation (in shares) 65,909 85,934 91,878 91,236
Performance stock units - market based        
Dilutive effects of:        
Stock based compensation (in shares) 87,360 115,825 104,203 127,694
Performance stock units - performance based        
Dilutive effects of:        
Stock based compensation (in shares) 0 0 0 0
Employee stock purchase program        
Dilutive effects of:        
Stock based compensation (in shares) 1,064 3,575 780 2,173