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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation Arrangements by Share-based Payment Award
The following table represents phantom stock award and performance unit activity during the periods indicated.
(Dollars in thousands)
Number of share equivalents (1)
 
Value of share equivalents (2)
Balance, December 31, 2012
328,273

 
$
16,125

Granted
179,041

 
11,253

Forfeited share equivalents
(18,744
)
 
1,178

Vested share equivalents
(54,686
)
 
2,937

Balance, December 31, 2013
433,884

 
$
27,270

Granted
146,166

 
9,479

Forfeited share equivalents
(22,800
)
 
1,479

Vested share equivalents
(81,903
)
 
5,512

Balance, December 31, 2014
475,347

 
$
30,826

Granted
167,573

 
9,228

Forfeited share equivalents
(34,681
)
 
1,910

Vested share equivalents
(145,809
)
 
9,288

Balance, December 31, 2015
462,430

 
$
25,466

(1)
Number of share equivalents includes all reinvested dividend equivalents for the years indicated.
(2)
Except for share equivalents at the beginning of each period, which are based on the value at that time, and vested share payments, which are based on the cash paid at the time of vesting, the value of share equivalents is calculated based on the market price of the Company’s stock at the end of the respective periods. The market price of the Company’s stock was $55.07, $64.85 and $62.85 on December 31, 2015, 2014 and 2013, respectively.
The following table represents unvested restricted stock award and restricted share unit activity for the years ended December 31:
 
2015
 
2014
 
2013
Balance at beginning of period
506,289

 
523,756

 
538,202

Granted
207,575

 
168,254

 
167,095

Forfeited
(26,970
)
 
(18,171
)
 
(28,713
)
Earned and issued
(179,764
)
 
(167,550
)
 
(152,828
)
Balance at end of period
507,130

 
506,289

 
523,756

The following table represents the activity related to stock options during the periods indicated:
 
Number of Shares
 
Weighted Average Exercise Price
 
Aggregate Intrinsic Value (Dollars in thousands)
 
Weighted Average Remaining Contract Life (in years)
Outstanding options, December 31, 2012
1,236,075

 
$
51.48

 
 
 
 
Granted
75,722

 
52.36

 
 
 
 
Exercised
(200,748
)
 
40.35

 
$
2,740

 
 
Forfeited or expired
(38,220
)
 
55.87

 
 
 
 
Outstanding options, December 31, 2013
1,072,829

 
$
53.47

 
 
 
 
Granted
77,434

 
65.31

 
 
 
 
Exercised
(267,421
)
 
48.57

 
4,612

 
 
Forfeited or expired
(15,160
)
 
60.38

 
 
 
 
Outstanding options, December 31, 2014
867,682

 
$
55.92

 
 
 
 
Granted
82,001

 
62.50

 
 
 
 
Exercised
(119,917
)
 
51.71

 
1,516

 
 
Forfeited or expired
(15,989
)
 
66.52

 
 
 
 
Outstanding options, December 31, 2015
813,777

 
$
56.99

 
$
1,061

 
5.1
 
 
 
 
 
 
 
 
Exercisable options, December 31, 2013
707,934

 
53.54

 
 
 
 
Exercisable options, December 31, 2014
562,752

 
55.92

 
 
 
 
Exercisable options, December 31, 2015
546,842

 
$
56.54

 
$
665

 
3.9
Schedule of Stock Option Activity by Exercise Price Range
The following table represents weighted average remaining life as of December 31, 2015 for options outstanding within the stated exercise prices:
 
 
Options Outstanding
 
Options Exercisable
Exercise Price Range Per Share
 
Number of Options
 
Weighted Average Exercise Price
 
Weighted Average Remaining Life
 
Number of Options
 
Weighted Average Exercise Price
$36.48 to $51.69
 
108,856

 
$
50.05

 
5.4 years
 
70,437

 
$
49.69

$51.70 to $52.88
 
170,627

 
52.34

 
6.5 years
 
86,365

 
52.34

$52.89 to $56.26
 
133,884

 
54.94

 
4.3 years
 
124,397

 
54.89

$56.27 to $59.04
 
121,591

 
57.53

 
1.2 years
 
119,855

 
57.52

$59.05 to $62.39
 
119,583

 
59.92

 
3.4 years
 
116,867

 
59.87

$62.40 to $111.71
 
159,236

 
65.83

 
8.2 years
 
28,921

 
75.41

Total options
 
813,777

 
$
56.99

 
5.1 years
 
546,842

 
$
56.54
Schedule of Valuation Assumptions
The following weighted-average assumptions were used for option awards issued during the years ended December 31:
 
2015
 
2014
 
2013
Expected dividends
2.2
%
 
2.1
%
 
2.6
%
Expected volatility
35.6
%
 
35.8
%
 
34.8
%
Risk-free interest rate
2.0
%
 
2.3
%
 
1.7
%
Expected term (in years)
7.5

 
7.5

 
8.6

Weighted-average grant-date fair value
$
19.57

 
$
21.26

 
$
15.37
Schedule of Allocation for Share-based Compensation Expense
The following table indicates compensation expense recorded for phantom stock and performance units based on the number of share equivalents vested at December 31 of the years indicated and the current market price of the Company’s stock at that time:
(Dollars in thousands)
2015
 
2014
 
2013
Compensation expense related to phantom stock and performance units
$
12,109

 
$
5,496

 
$
4,855

The following table represents the compensation expense that is included in non-interest expense and related income tax benefits in the accompanying consolidated statements of comprehensive income related to stock options for the years ended December 31:
(Dollars in thousands)
2015
 
2014
 
2013
Compensation expense related to stock options
$
1,861

 
$
2,053

 
$
2,110

Income tax benefit related to stock options
317

 
375

 
379

The following table represents the compensation expense that was included in non-interest expense and related income tax benefits in the accompanying consolidated statements of comprehensive income related to restricted stock awards and restricted share units for the years ended December 31:
(Dollars in thousands)
2015
 
2014
 
2013
Compensation expense related to restricted stock awards and restricted share units
$
12,045

 
$
9,932

 
$
8,593

Income tax benefit related to restricted stock awards and restricted share units
4,215

 
3,476

 
3,008