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Stock-Based Incentive Plan (Tables)
 9 Months Ended
Sep. 30, 2022
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, 2022:
(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, 2022
Outstanding at December 31, 2021351,252 $25.74 
Expired(1,500)14.80 
Forfeited(22,707)28.33 
Exercised(25,781)22.33 
Outstanding at September 30, 2022301,264 25.90 4.3$353 
Exercisable at September 30, 2022301,264 $25.90 4.3$353 
Summary of Nonvested Restricted Stock Units
The following is a summary of nonvested restricted stock units at September 30, 2022 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, 2021358,134 $23.61 
Granted184,863 28.07 
Cancelled by performance factor(555)23.18 
Vested(124,167)23.53 
Forfeited(10,927)25.54 
Nonvested stock units at September 30, 2022407,348 $25.57 
Certain Information Regarding Restricted Stock
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)20222021
Restricted stock units granted184,863 155,607 
Weighted average grant date fair value$28.07 $27.81 
Intrinsic value of units granted$5,189 $4,328 
Restricted stock units vested124,167 87,075 
Weighted average grant date fair value$23.53 $22.71 
Intrinsic value of units vested$3,519 $2,391 
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, 2022 is presented below:
(Dollars in thousands)Unrecognized Compensation CostWeighted-Average Period Remaining (Years)
Restricted stock units$6,492 2.0
Compensation Expense Related to Stock Incentive Plans Recognized
The following table presents information related to the Corporation’s compensation expense related to stock incentive plans recognized for the periods indicated:
Nine Months Ended September 30,
(Dollars in thousands)20222021
Stock-based compensation expense:
Stock options$— $62 
Restricted stock units2,998 2,612 
Employee stock purchase plan78 72 
Total$3,076 $2,746 
Tax benefit on nonqualified stock option expense and disqualifying dispositions of incentive stock options$436 $389