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Stock-Based Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
The following table presents compensation expense and related tax benefits for all equity awards recognized in the consolidated statements of income:
 
2014
 
2013
 
2012
 
(in thousands)
Compensation expense
$
5,865

 
$
5,330

 
$
4,834

Tax benefit
(1,608
)
 
(1,475
)
 
(1,253
)
Stock-based compensation, net of tax
$
4,257

 
$
3,855

 
$
3,581

Schedule of Unrecognized Compensation Cost, Nonvested Awards
The following table presents compensation expense and related tax benefits for restricted stock awards, RSUs and PSUs recognized in the consolidated statements of income, and included as a component of total stock-based compensation within the preceding table:
 
2014
 
2013
 
2012
 
(in thousands)
Compensation expense
$
4,345

 
$
3,705

 
$
3,506

Tax benefit
(1,510
)
 
(1,297
)
 
(1,227
)
Restricted stock compensation, net of tax
$
2,835

 
$
2,408

 
$
2,279

Schedule of Share-based Compensation, Stock Options, Activity
The following table provides information about stock option activity for the year ended December 31, 2014:
 
Stock
Options
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value
(in millions)
Outstanding as of December 31, 2013
5,567,701

 
$
13.25

 
 
 
 
Granted
288,626

 
12.61

 
 
 
 
Exercised
(215,047
)
 
9.62

 
 
 
 
Forfeited
(435,502
)
 
14.73

 
 
 
 
Expired
(903,314
)
 
14.95

 
 
 
 
Outstanding as of December 31, 2014
4,302,464

 
$
12.89

 
4.4 years
 
$
4.5

Exercisable as of December 31, 2014
3,546,500

 
$
13.13

 
3.5 years
 
$
4.0

Schedule of Nonvested Share Activity
The following table provides information about nonvested stock options, restricted stock, RSUs and PSUs granted under the Employee Option Plan and Directors' Plan for the year ended December 31, 2014:
 
Nonvested Stock Options
 
Restricted Stock/RSUs/PSUs
 
Options
 
Weighted
Average
Grant Date
Fair Value
 
Shares
 
Weighted
Average
Grant Date
Fair Value
Nonvested as of December 31, 2013
1,071,266

 
$
2.35

 
943,039

 
$
10.90

Granted
288,626

 
3.14

 
553,343

 
12.51

Vested
(514,734
)
 
2.29

 
(389,328
)
 
9.83

Forfeited
(89,194
)
 
2.49

 
(43,967
)
 
10.61

Nonvested as of December 31, 2014
755,964

 
$
2.68

 
1,063,087

 
$
11.83

Schedule Of Options Exercised
The following table presents information about stock options exercised:
 
2014
 
2013
 
2012
 
(dollars in thousands)
Number of options exercised
215,047

 
451,102

 
141,305

Total intrinsic value of options exercised
$
568

 
$
1,612

 
$
402

Cash received from options exercised
$
2,068

 
$
3,650

 
$
987

Tax deduction realized from options exercised
$
568

 
$
1,416

 
$
322

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The fair value of certain PSUs with market based performance conditions granted in 2014 under the Employee Option Plan was estimated on the grant date using the Monte Carlo valuation methodology performed by a third-party valuation expert, which is dependent upon certain assumptions, as summarized in the following table:
Risk-free interest rate
0.91
%
Volatility of Corporation’s stock
29.63
%
Expected life of options
3 Years

The fair value of stock option awards under the Employee Option Plan was estimated on the grant date using the Black-Scholes valuation methodology, which is dependent upon certain assumptions, as summarized in the following table:
 
2014
 
2013
 
2012
Risk-free interest rate
2.44
%
 
1.27
%
 
1.68
%
Volatility of Corporation’s stock
28.05
%
 
27.64
%
 
26.60
%
Expected dividend yield
2.36
%
 
2.48
%
 
2.54
%
Expected life of options
7 Years

 
7 Years

 
7 Years

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions
The following table summarizes activity under the ESPP:
 
2014
 
2013
 
2012
ESPP shares purchased
132,640

 
141,608

 
165,456

Average purchase price per share (85% of market value)
$
10.31

 
$
10.02

 
$
8.35

Compensation expense recognized (in thousands)
$
241

 
$
251

 
$
244