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Stock-Based Incentive Plan (Tables)
 6 Months Ended
Jun. 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 six months ended June 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 June 30, 2023
Outstanding at December 31, 2022294,111 $26.11 
Forfeited(6,987)28.33 
Exercised(6,210)18.48 
Outstanding at June 30, 2023280,914 26.22 3.7$— 
Exercisable at June 30, 2023280,914 26.22 3.7— 
Summary of Nonvested Restricted Stock Units
The following is a summary of nonvested restricted stock units at June 30, 2023 including changes during the six 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(181,175)22.20 
Forfeited(27,994)27.23 
Nonvested stock units at June 30, 2023413,338 $26.65 
Certain Information Regarding Restricted Stock Units
Certain information regarding restricted stock units is summarized below for the periods indicated:
Six Months Ended June 30,
(Dollars in thousands, except per share data)20232022
Restricted stock units granted213,429 178,719 
Weighted average grant date fair value$25.04 $28.18 
Intrinsic value of units granted$5,345 $5,037 
Restricted stock units vested181,175 123,834 
Weighted average grant date fair value$22.20 $23.53 
Intrinsic value of units vested$4,506 $3,510 
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 June 30, 2023 is presented below:
(Dollars in thousands)Unrecognized Compensation CostWeighted-Average Period Remaining (Years)
Restricted stock units$7,985 2.1
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:
Six Months Ended June 30,
(Dollars in thousands)20232022
Stock-based compensation expense:
Restricted stock units$2,115 $1,949 
Employee stock purchase plan55 52 
Total$2,170 $2,001 
Tax benefit on nonqualified stock option expense and disqualifying dispositions of incentive stock options$247 $215