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Earnings per Share (Tables)
 6 Months Ended
Jun. 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 EndedSix Months Ended
 June 30,June 30,
(Dollars and shares in thousands, except per share data)2021202020212020
Numerator:
Net income$20,875 $2,085 $53,478 $2,923 
Net income allocated to unvested restricted stock awards— (3)(30)— 
Net income allocated to common shares$20,875 $2,082 $53,448 $2,923 
Denominator:
Weighted average shares outstanding29,390 29,187 29,359 29,237 
Average unvested restricted stock awards— (38)(16)(53)
Denominator for basic earnings per share—weighted-average shares outstanding
29,390 29,149 29,343 29,184 
Effect of dilutive securities—employee stock options and restricted stock units140 15 136 35 
Denominator for diluted earnings per share—adjusted weighted-average shares outstanding
29,530 29,164 29,479 29,219 
Basic earnings per share$0.71 $0.07 $1.82 $0.10 
Diluted earnings per share$0.71 $0.07 $1.81 $0.10 
Average antidilutive options and restricted stock units excluded from computation of diluted earnings per share283 705 287 451