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Stock-Based Incentive Plan (Tables)
 12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Status of Options Granted Under Long-Term Incentive Plan
The following is a summary of the Corporation's stock option activity and related information for the year ended December 31, 2023:
(Dollars in thousands, except per share data)Shares Under OptionWeighted Average Exercise Price Per ShareWeighted Average Remaining Contractual Life (Years)Aggregate Intrinsic Value at December 31, 2023
Outstanding at December 31, 2022294,111 $26.11 
Forfeited(17,987)28.34 
Exercised(6,210)18.48 
Outstanding at December 31, 2023269,914 26.14 3.2$182 
Exercisable at December 31, 2023269,914 26.14 3.2182 
Summary of Nonvested Stock Options
Summary of Nonvested Restricted Stock Units
The following is a summary of nonvested restricted stock units at December 31, 2023 including changes during the year:
(Dollars in thousands, except per share data) Nonvested Stock Units Weighted Average Grant Date Fair Value
Nonvested stock units at December 31, 2022408,264 $25.57 
Granted217,929 24.88 
Added by performance factor814 19.20 
Vested(181,508)22.21 
Cancelled/forfeited(52,951)26.96 
Nonvested stock units at December 31, 2023392,548 26.54 
Certain Information Regarding Restricted Stock Awards and Units
Certain information regarding restricted stock awards and units is summarized below for the periods indicated:
For the Years Ended December 31,
(Dollars in thousands, except per share data)202320222021
Restricted stock units granted217,929 186,360 155,607 
Weighted average grant date fair value$24.88 $28.06 $27.81 
Intrinsic value of units granted$5,423 $5,229 $4,328 
Restricted stock awards and units vested181,508 124,167 87,075 
Weighted average grant date fair value$22.21 $23.53 $22.71 
Intrinsic value of awards and units vested$4,512 $3,519 $2,391 
Schedule of Unrecognized Compensation Cost, Nonvested Awards
The total unrecognized compensation expense and the weighted average period over which unrecognized compensation expense is expected to be recognized related to nonvested restricted stock units at December 31, 2023 is presented below:
(Dollars in thousands)Unrecognized Compensation CostWeighted-Average Period Remaining (Years)
Restricted stock units$5,447 1.8
Compensation Expense Related to Stock Incentive Plans Recognized
The following table presents information related to the Corporation's compensation expense related to stock incentive plans recognized for the periods indicated:
For the Years Ended December 31,
(Dollars in thousands)202320222021
Stock-based compensation expense:
Stock options$— $— $62 
Restricted stock awards and units4,194 4,120 3,636 
Employee stock purchase plan104 100 91 
Total$4,298 $4,220 $3,789 
Tax benefit on nonqualified stock option expense, restricted stock awards and disqualifying dispositions of incentive stock options$702 $666 $551