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Net Income per Common Share (Tables)
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Schedule of calculation of net income per common share The calculation of net income per common share for the three and nine months ended September 30, 2021 and 2020 was as follows:
Three Months Ended September 30,Nine Months Ended September 30,
(dollars and shares in thousands, except per share data)2021202020212020
Basic:
Net income$43,609 $41,346 $135,071 $93,325 
Average common shares outstanding31,959 32,229 31,931 32,434 
Basic net income per common share$1.36 $1.28 $4.23 $2.88 
Diluted:
Net income$43,609 $41,346 $135,071 $93,325 
Average common shares outstanding31,959 32,229 31,931 32,434 
Adjustment for common share equivalents72 22 62 24 
Average common shares outstanding-diluted32,031 32,251 31,993 32,458 
Diluted net income per common share$1.36 $1.28 $4.22 $2.88 
Anti-dilutive shares3 26 3 26