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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Fair value assumptions of stock options
The following assumptions were used in estimating the fair value for options granted in the first six months of 2020 and full year 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 six months ended June 30, 2020 is presented below:
Stock Options
Shares(a)
Weighted Average
Exercise Price		Weighted Average Remaining Contractual Term
Aggregate Intrinsic Value(a)
Outstanding at December 31, 20195,543  $20.13  6.25 years$16,043  
Granted1,697  18.43  
Exercised(110) 13.95  
Forfeited or expired(219) 22.30  
Outstanding at June 30, 20206,911  $19.74  6.73 years$213  
Options Exercisable at June 30, 20204,242  $19.21  5.32 years$213  
(a) In thousands
Summary of restricted stock awards activity (excluding salary shares)
The following table summarizes information about the Corporation’s restricted stock awards activity for the six months ended June 30, 2020:
Restricted Stock Awards
Shares(a)
Weighted Average
Grant Date Fair Value
Outstanding at December 31, 20192,393  $22.39  
Granted1,032  18.38  
Vested(804) 23.05  
Forfeited(72) 22.64  
Outstanding at June 30, 20202,550  $20.56  
(a) In thousands