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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
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 2019 and full year 2018:
 
2019
 
2018
Dividend yield
3.30
%
 
2.50
%
Risk-free interest rate
2.60
%
 
2.60
%
Weighted average expected volatility
24.00
%
 
22.00
%
Weighted average expected life
5.75 years

 
5.75 years

Weighted average per share fair value of options
$4.00
 
$4.47
Summary of company's stock option activities
A summary of the Corporation’s stock option activity for the six months ended June 30, 2019 is presented below:
Stock Options
Shares(a)
Weighted Average
Exercise Price
Weighted Average Remaining Contractual Term
Aggregate Intrinsic Value(a)
Outstanding at December 31, 2018
5,281

$
19.09

6.18
$
12,392

Granted
1,050

22.77

 
 
Exercised
(418
)
15.68

 
 
Forfeited or expired
(85
)
23.96

 
 
Outstanding at June 30, 2019
5,828

$
19.94

6.61
$
14,870

Options Exercisable at June 30, 2019
3,631

$
18.04

5.32
$
14,016
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, 2019:
Restricted Stock Awards
Shares(a)
 
Weighted Average
Grant Date Fair Value
Outstanding at December 31, 2018
1,993

 
$
21.92

Granted
1,164

 
22.21

Vested
(673
)
 
20.49

Forfeited
(38
)
 
24.14

Outstanding at June 30, 2019
2,446

 
$
22.42