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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Fair value assumptions of stock options The following assumptions were used in estimating the fair value for options granted in 2018, 2017, and 2016:
 
2018
2017
2016
Dividend yield
2.50
%
2.00
%
2.50
%
Risk-free interest rate
2.60
%
2.00
%
2.00
%
Weighted average expected volatility
22.00
%
25.00
%
25.00
%
Weighted average expected life
5.75 years

5.5 years

5.5 years

Weighted average per share fair value of options
$4.47
$5.30
$3.36
Summary of Company's Stock Option Activities A summary of the Corporation’s stock option activity for the year ended December 31, 2018 is presented below:
Stock Options
Shares
Weighted Average
Exercise Price
Weighted Average
Remaining
Contractual Term
Aggregate
Intrinsic Value 
(in thousands)
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
(1,031,875
)
16.45

 
 
Forfeited or expired
(114,695
)
23.88

 
 
Outstanding at December 31, 2018
5,280,908

$
19.09

6.18
$
12,392

Options exercisable at December 31, 2018
3,187,894

$
16.93

4.92
$
10,796
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, 2018:
Restricted Stock
Shares
Weighted Average
Grant Date Fair Value
Outstanding at December 31, 2017
2,026,071

$
19.68

Granted
615,484

24.60

Vested
(587,775
)
18.44

Forfeited
(60,948
)
22.36

Outstanding at December 31, 2018
1,992,832

$
21.92