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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [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 2016 and full year 2015.
 
2016
 
2015
Dividend yield
2.50
%
 
2.00
%
Risk-free interest rate
2.00
%
 
2.00
%
Weighted average expected volatility
25.00
%
 
20.00
%
Weighted average expected life
5.5 years

 
6.0 years

Weighted average per share fair value of options
$3.36
 
$3.08
Summary of Company's Stock Option Activities
A summary of the Corporation’s stock option activity for the year ended December 31, 2015, and the three month ended March 31, 2016 is presented below.
Stock Options
Shares
 
Weighted Average
Exercise Price
 
Weighted Average Remaining Contractual Term
 
Aggregate Intrinsic Value (000s)
Outstanding at December 31, 2014
7,847,338

 
$
18.34

 
 
 
 
Granted
1,348,504

 
17.95

 
 
 
 
Exercised
(1,351,646
)
 
13.90

 
 
 
 
Forfeited or expired
(1,215,053
)
 
29.13

 
 
 
 
Outstanding at December 31, 2015
6,629,143

 
$
17.22

 
6.24
 
$
18,730

Options Exercisable at December 31, 2015
4,190,245

 
$
17.25

 
4.93
 
$
14,873

Granted
1,302,298

 
$
17.45

 
 
 
 
Exercised
(96,602
)
 
13.60

 
 
 
 
Forfeited or expired
(48,190
)
 
17.75

 
 
 
 
Outstanding at March 31, 2016
7,786,649

 
$
17.30

 
6.61
 
$
14,682

Options Exercisable at March 31, 2016
4,907,257

 
$
17.22

 
5.18
 
$
12,950
Summary of Company's Nonvested Stock Option Activities
The following table summarizes information about the Corporation’s nonvested stock option activity for the year ended December 31, 2015, and for the three months ended March 31, 2016.
Nonvested Stock Options
Shares
 
Weighted Average Grant Date Fair Value
Nonvested at December 31, 2014
2,770,662

 
$
3.74

Granted
1,348,504

 
3.08

Vested
(1,459,709
)
 
4.19

Forfeited
(220,559
)
 
3.28

Nonvested at December 31, 2015
2,438,898

 
$
3.15

Granted
1,302,298

 
3.36

Vested
(813,614
)
 
3.25

Forfeited
(48,190
)
 
3.20

Nonvested at March 31, 2016
2,879,392

 
$
3.21
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, 2015, and for the three months ended March 31, 2016.
Restricted Stock
Shares
 
Weighted Average
Grant Date Fair Value
Outstanding at December 31, 2014
1,982,126

 
$
15.79

Granted
1,173,847

 
18.09

Vested
(709,582
)
 
15.62

Forfeited
(196,363
)
 
16.87

Outstanding at December 31, 2015
2,250,028

 
$
17.03

Granted
1,041,985

 
16.37

Vested
(732,553
)
 
16.46

Forfeited
(34,299
)
 
17.69

Outstanding at March 31, 2016
2,525,161

 
$
16.91