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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 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Basic        
Net income to common stockholders $ 11,993 $ 15,428 $ 29,050 $ 82,346
Weighted average common shares outstanding (in shares) 23,162,614 24,227,020 23,220,331 24,483,054
Basic earnings per common share (in dollars per share) $ 0.52 $ 0.64 $ 1.25 $ 3.36
Diluted        
Net income to common stockholders $ 11,993 $ 15,428 $ 29,050 $ 82,346
Weighted average common shares outstanding (in shares) 23,162,614 24,227,020 23,220,331 24,483,054
Dilutive effects of:        
Average shares and dilutive potential common shares (in shares) 23,458,914 24,979,257 23,572,429 25,125,642
Diluted earnings per common share (in dollars per share) $ 0.51 $ 0.62 $ 1.23 $ 3.28
Stock options        
Dilutive effects of:        
Stock based compensation (in shares) 82,909 85,239 77,286 95,252
Restricted stock awards        
Dilutive effects of:        
Stock based compensation (in shares) 80,841 122,723 101,842 162,883
Restricted stock units        
Dilutive effects of:        
Stock based compensation (in shares) 84,137 97,512 86,844 96,174
Performance stock units - market based        
Dilutive effects of:        
Stock based compensation (in shares) 47,248 117,358 85,218 122,526
Performance stock units - performance based        
Dilutive effects of:        
Stock based compensation (in shares) 0 327,016 0 163,508
Employee stock purchase program        
Dilutive effects of:        
Stock based compensation (in shares) 1,165 2,389 908 2,245