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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 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 three 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 three months ended March 31, 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
(355
)
15.61

 
 
Forfeited or expired
(72
)
23.46

 
 
Outstanding at March 31, 2019
5,905

$
19.91

6.82
$
15,870

Options Exercisable at March 31, 2019
3,691

$
18.01

5.51
$
14,953
Summary of restricted stock awards activity (excluding salary shares) The following table summarizes information about the Corporation’s restricted stock awards activity for the three months ended March 31, 2019:
Restricted Stock Awards
Shares(a)
 
Weighted Average
Grant Date Fair Value
Outstanding at December 31, 2018
1,993

 
$
21.92

Granted
1,153

 
22.21

Vested
(618
)
 
20.32

Forfeited
(18
)
 
23.67

Outstanding at March 31, 2019
2,510

 
$
22.43