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Earnings per Share
 9 Months Ended
Sep. 30, 2020
Earnings Per Share, Basic and Diluted [Abstract]  
Earnings Per Share 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, 2019.

Three Months EndedNine Months Ended
 September 30,September 30,
(Dollars and shares in thousands, except per share data)2020201920202019
Numerator:
Net income$18,119 $17,662 $21,042 $50,209 
Net income allocated to unvested restricted stock awards(23)(58)(29)(186)
Net income allocated to common shares$18,096 $17,604 $21,013 $50,023 
Denominator:
Weighted average shares outstanding29,227 29,306 29,233 29,290 
Average unvested restricted stock awards(38)(95)(47)(111)
Denominator for basic earnings per share—weighted-average shares outstanding
29,189 29,211 29,186 29,179 
Effect of dilutive securities—employee stock options and restricted stock units28 74 32 64 
Denominator for diluted earnings per share—adjusted weighted-average shares outstanding
29,217 29,285 29,218 29,243 
Basic earnings per share$0.62 $0.60 $0.72 $1.71 
Diluted earnings per share$0.62 $0.60 $0.72 $1.71 
Average antidilutive options and restricted stock units excluded from computation of diluted earnings per share526 323 509 326