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Stock-Based Incentive Plan (Tables)
 3 Months Ended
Mar. 31, 2021
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 three months ended March 31, 2021:
(Dollars in thousands, except per share data)Shares Under OptionWeighted Average Exercise Price Per ShareWeighted Average Remaining Contractual Life (Years)Aggregate Intrinsic Value at March 31, 2021
Outstanding at December 31, 2020453,785 $25.06 
Forfeited(9,500)28.33 
Exercised(36,286)20.90 
Outstanding at March 31, 2021407,999 25.35 5.6$1,322 
Exercisable at March 31, 2021407,999 25.35 5.61,322 
Summary of Nonvested Stock Options
The following is a summary of nonvested stock options at March 31, 2021 including changes during the three months then ended:
(Dollars in thousands, except per share data) Nonvested Stock Options Weighted Average Grant Date Fair Value
Nonvested stock options at December 31, 202049,771 $6.46 
Vested(49,771)6.46 
Nonvested stock options at March 31, 2021— — 
Summary of Nonvested Restricted Stock Awards and Units
The following is a summary of nonvested restricted stock awards and nonvested restricted stock units at March 31, 2021 including changes during the three months then ended:
(Dollars in thousands, except per share data) Nonvested Stock Awards and Units Weighted Average Grant Date Fair Value
Nonvested stock awards and units at December 31, 2020305,704 $21.18 
Granted139,007 27.67 
Vested(85,731)22.68 
Cancelled(9,953)22.35 
Nonvested stock units at March 31, 2021349,027 23.37 
Certain Information Regarding Restricted Stock
Certain information regarding restricted stock awards and units is summarized below for the periods indicated:
Three Months Ended March 31,
(Dollars in thousands, except per share data)20212020
Restricted stock units granted139,007 179,080 
Weighted average grant date fair value$27.67 $18.62 
Intrinsic value of units granted$3,847 $2,923 
Restricted stock awards and units vested85,731 57,355 
Weighted average grant date fair value$22.68 $27.23 
Intrinsic value of awards and units vested$2,354 $1,335 
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 March 31, 2021 is presented below:
(Dollars in thousands)Unrecognized Compensation CostWeighted-Average Period Remaining (Years)
Restricted stock units$6,925 2.3
$6,925 2.3
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:
Three Months Ended March 31,
(Dollars in thousands)20212020
Stock-based compensation expense:
Stock options$62 $108 
Restricted stock awards and units812 327 
Employee stock purchase plan23 20 
Total$897 $455 
Tax benefit on nonqualified stock option expense, restricted stock awards and disqualifying dispositions of incentive stock options$33 $106