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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Fair value assumptions of stock options
The following assumptions were used in estimating the fair value for options granted in 2020 and 2019:
20202019
Dividend yield3.50 %3.30 %
Risk-free interest rate1.60 %2.60 %
Weighted average expected volatility21.00 %24.00 %
Weighted average expected life5.75 years5.75 years
Weighted average per share fair value of options$2.39$4.00
Summary of Company's Stock Option Activities
A summary of the Corporation’s stock option activity for the year ended December 31, 2021 is presented below:
Stock Options
Shares(a)
Weighted Average
Exercise Price		Weighted Average
Remaining
Contractual Term		Aggregate
Intrinsic Value 
($ in thousands)
Outstanding at December 31, 20206,473 $19.77 6.23 years$2,005 
Exercised(1,533)16.58 
Forfeited or expired(126)22.28 
Outstanding at December 31, 20214,814 $20.72 5.96 years$12,532 
Options exercisable at December 31, 20213,264 $21.00 5.13 years$8,294 
(a) In thousands
Summary of Restricted Stock Awards Activity (Excluding Salary Shares)
The following table summarizes information about the Corporation’s restricted stock activity for the year ended December 31, 2021:
Restricted Stock
Shares(a)
Weighted Average
Grant Date Fair Value
Outstanding at December 31, 20202,293 $20.46 
Granted1,229 20.03 
Vested(812)21.23 
Forfeited(75)21.72 
Outstanding at December 31, 20212,635 $19.87 
(a) In thousands