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Net Income per Common Share
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Net Income per Common Share Net Income per Common Share
The calculation of net income per common share for the three and six months ended June 30, 2021 and 2020 was as follows:
Three Months Ended June 30,Six Months Ended June 30,
(dollars and shares in thousands, except per share data)2021202020212020
Basic:
Net income$47,993 $28,856 $91,462 $51,979 
Average common shares outstanding31,963 32,225 31,916 32,537 
Basic net income per common share$1.50 $0.90 $2.87 $1.60 
Diluted:
Net income$47,993 $28,856 $91,462 $51,979 
Average common shares outstanding31,963 32,225 31,916 32,537 
Adjustment for common share equivalents62 16 58 24 
Average common shares outstanding-diluted32,025 32,241 31,974 32,561 
Diluted net income per common share$1.50 $0.90 $2.86 $1.60 
Anti-dilutive shares3 49 3 26