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Stock-Based Incentive Plan (Tables)
 12 Months Ended
Dec. 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 year ended December 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 December 31, 2021
Outstanding at December 31, 2020453,785 $25.06 
Forfeited(9,500)28.33 
Exercised(93,033)22.13 
Outstanding at December 31, 2021351,252 25.74 5.0$1,467 
Exercisable at December 31, 2021351,252 25.74 5.01,467 
Summary of Nonvested Stock Options
The following is a summary of nonvested stock options at December 31, 2021 including changes during the year:
(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 December 31, 2021— — 
Summary of Nonvested Restricted Stock Awards and Units
In the following tables, restricted stock units have been combined with restricted stock awards, as the determination of the value at the grant date, which is the closing price of the Corporation's common stock on the date of grant, and methodology for recording stock-based compensation expense is the same for restricted stock units and restricted stock awards. The following is a summary of nonvested restricted stock awards and nonvested restricted stock units at December 31, 2021 including changes during the year:
(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 
Granted155,607 27.81 
Vested(87,075)22.71 
Cancelled/forfeited(16,102)22.95 
Nonvested stock units at December 31, 2021358,134 23.61 
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)202120202019
Restricted stock units granted155,607 262,844 114,729 
Weighted average grant date fair value$27.81 $19.00 $25.65 
Intrinsic value of units granted$4,328 $4,994 $3,072 
Restricted stock awards and units vested87,075 59,855 44,807 
Weighted average grant date fair value$22.71 $27.17 $21.65 
Intrinsic value of awards and units vested$2,391 $1,375 $1,119 
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, 2021 is presented below:
(Dollars in thousands)Unrecognized Compensation CostWeighted-Average Period Remaining (Years)
Restricted stock units$4,538 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)202120202019
Stock-based compensation expense:
Stock options$62 $338 $716 
Restricted stock awards and units3,636 1,142 1,632 
Employee stock purchase plan91 88 74 
Total$3,789 $1,568 $2,422 
Tax benefit on nonqualified stock option expense, restricted stock awards and disqualifying dispositions of incentive stock options$551 $278 $518