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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
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 2019, 2018, and 2017:
201920182017
Dividend yield3.30 %2.50 %2.00 %
Risk-free interest rate2.60 %2.60 %2.00 %
Weighted average expected volatility24.00 %22.00 %25.00 %
Weighted average expected life5.75 years5.75 years5.5 years
Weighted average per share fair value of options$4.00$4.47$5.30
Summary of Company's Stock Option Activities
A summary of the Corporation’s stock option activity for the year ended December 31, 2019 is presented below:
Stock Options
Shares(a)
Weighted Average
Exercise Price		Weighted Average
Remaining
Contractual Term		Aggregate
Intrinsic Value 
($ in thousands)
Outstanding at December 31, 20185,281  $19.09  6.18 years$12,392  
Granted1,050  22.77  
Exercised(674) 15.75  
Forfeited or expired(114) 22.42  
Outstanding at December 31, 20195,543  $20.13  6.25 years$16,043  
Options exercisable at December 31, 20193,360  $18.22  4.95 years$14,980  
(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, 2019:
Restricted Stock
Shares(a)
Weighted Average
Grant Date Fair Value
Outstanding at December 31, 20181,993  $21.92  
Granted1,180  22.20  
Vested(710) 20.61  
Forfeited(69) 23.84  
Outstanding at December 31, 20192,393  $22.39  
(a) In thousands