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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2018
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 nine months of 2018 and full year 2017.
 
2018
 
2017
Dividend yield
2.50
%
 
2.00
%
Risk-free interest rate
2.60
%
 
2.00
%
Weighted average expected volatility
22.00
%
 
25.00
%
Weighted average expected life
5.75 years

 
5.5 years

Weighted average per share fair value of options
$4.47
 
$5.30
Summary of Company's Stock Option Activities A summary of the Corporation’s stock option activity for the nine months ended September 30, 2018 is presented below.
Stock Options
Shares
Weighted Average
Exercise Price
Weighted Average Remaining Contractual Term
Aggregate Intrinsic Value(a)
Outstanding at December 31, 2017
5,118,687

$
18.02

6.48
$
38,028

Granted
938,740

24.50

 
 
Assumed from Bank Mutual acquisition
370,051

14.35

 
 
Exercised
(966,213
)
16.57

 
 
Forfeited or expired
(63,313
)
25.17

 
 
Outstanding at September 30, 2018
5,397,952

$
19.07

6.48
$
37,423

Options Exercisable at September 30, 2018
3,253,556

$
16.89

5.24
$
29,649
Summary of Restricted Stock Awards Activity (Excluding Salary Shares) The following table summarizes information about the Corporation’s restricted stock activity for the nine months ended September 30, 2018.
Restricted Stock
Shares
 
Weighted Average
Grant Date Fair Value
Outstanding at December 31, 2017
2,026,071

 
$
19.68

Granted
592,371

 
24.72

Vested
(568,441
)
 
18.33

Forfeited
(50,478
)
 
22.25

Outstanding at September 30, 2018
1,999,523

 
$
21.94