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Earnings per Share (Tables)
 9 Months Ended
Sep. 30, 2021
Earnings Per Share, Basic and Diluted [Abstract]  
Summary of Computation for Basic and Diluted Earnings per Share
The following table sets forth the computation of basic and diluted earnings per share. For additional information on the calculation of basic and diluted earnings per share, see Note 1, "Summary of Significant Accounting Policies - Earnings per Share" of the Corporation's Annual Report on Form 10-K for the year ended December 31, 2020.
Three Months EndedNine Months Ended
 September 30,September 30,
(Dollars and shares in thousands, except per share data)2021202020212020
Numerator:
Net income$20,911 $18,119 $74,389 $21,042 
Net income allocated to unvested restricted stock awards— (23)(28)(29)
Net income allocated to common shares$20,911 $18,096 $74,361 $21,013 
Denominator:
Weighted average shares outstanding29,420 29,227 29,380 29,233 
Average unvested restricted stock awards— (38)(10)(47)
Denominator for basic earnings per share—weighted-average shares outstanding
29,420 29,189 29,370 29,186 
Effect of dilutive securities—employee stock options and restricted stock units142 28 143 32 
Denominator for diluted earnings per share—adjusted weighted-average shares outstanding
29,562 29,217 29,513 29,218 
Basic earnings per share$0.71 $0.62 $2.53 $0.72 
Diluted earnings per share$0.71 $0.62 $2.52 $0.72 
Average antidilutive options and restricted stock units excluded from computation of diluted earnings per share286 526 289 509