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Stock-Based Incentive Plan (Tables)
 9 Months Ended
Sep. 30, 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 nine months ended September 30, 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 September 30, 2023
Outstanding at December 31, 2022294,111 $26.11 
Forfeited(14,487)28.35 
Exercised(6,210)18.48 
Outstanding at September 30, 2023273,414 26.16 3.4$— 
Exercisable at September 30, 2023273,414 26.16 3.4— 
Summary of Nonvested Restricted Stock Units
The following is a summary of nonvested restricted stock units at September 30, 2023 including changes during the nine months then ended:
(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 
Granted213,429 25.04 
Added by performance factor814 19.20 
Vested(181,508)22.21 
Forfeited(28,396)27.20 
Nonvested stock units at September 30, 2023412,603 $26.65 
Certain Information Regarding Restricted Stock Units
Certain information regarding restricted stock units is summarized below for the periods indicated:
Nine Months Ended September 30,
(Dollars in thousands, except per share data)20232022
Restricted stock units granted213,429 184,863 
Weighted average grant date fair value$25.04 $28.07 
Intrinsic value of units granted$5,345 $5,189 
Restricted stock units vested181,508 124,167 
Weighted average grant date fair value$22.21 $23.53 
Intrinsic value of units vested$4,512 $3,519 
Schedule of Unrecognized Compensation Cost, Nonvested Restricted Stock Units
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 September 30, 2023 is presented below:
(Dollars in thousands)Unrecognized Compensation CostWeighted-Average Period Remaining (Years)
Restricted stock units$6,844 1.9
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:
Nine Months Ended September 30,
(Dollars in thousands)20232022
Stock-based compensation expense:
Restricted stock units$3,229 $2,998 
Employee stock purchase plan83 78 
Total$3,312 $3,076 
Tax benefit on nonqualified stock option expense and disqualifying dispositions of incentive stock options$492 $436