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Net Income per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share, Basic [Abstract]        
Net income $ 43,609 $ 41,346 $ 135,071 $ 93,325
Average common shares outstanding (in shares) 31,959 32,229 31,931 32,434
Basic net income per common share (in dollars per share) $ 1.36 $ 1.28 $ 4.23 $ 2.88
Earnings Per Share, Diluted [Abstract]        
Net income $ 43,609 $ 41,346 $ 135,071 $ 93,325
Average common shares outstanding (in shares) 31,959 32,229 31,931 32,434
Adjustment for common share equivalents (in shares) 72 22 62 24
Average common shares outstanding-diluted (in shares) 32,031 32,251 31,993 32,458
Diluted net income per common share (in dollars per share) $ 1.36 $ 1.28 $ 4.22 $ 2.88
Anti-dilutive shares (in shares) 3 26 3 26