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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation Arrangements by Share-based Payment Award
The following table represents unvested restricted stock award and restricted share unit activity for the years ended December 31:
 
2016
 
2015
 
2014
Balance at beginning of period
507,130

 
506,289

 
523,756

Granted
254,276

 
207,575

 
168,254

Forfeited
(28,855
)
 
(26,970
)
 
(18,171
)
Earned and issued
(189,290
)
 
(179,764
)
 
(167,550
)
Balance at end of period
543,261

 
507,130

 
506,289

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, 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

 
 
 
 
Granted
160,624

 
48.65

 
 
 
 
Exercised
(196,769
)
 
55.39

 
3,597

 
 
Forfeited or expired
(56,094
)
 
59.49

 
 
 
 
Outstanding options, December 31, 2016
721,538

 
$
55.38

 
$
20,583

 
6.0
 
 
 
 
 
 
 
 
Exercisable options, December 31, 2014
562,752

 
55.92

 
 
 
 
Exercisable options, December 31, 2015
546,842

 
$
56.54

 
 
 
 
Exercisable options, December 31, 2016
415,376

 
$
56.66

 
$
11,366

 
4.4
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, 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

Granted
215,745

 
18,069

Forfeited share equivalents
(42,051
)
 
3,522

Vested share equivalents
(163,294
)
 
8,509

Balance, December 31, 2016
472,830

 
$
39,600

(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 $83.75, $55.07 and $64.85 on December 31, 2016, 2015 and 2014, respectively.
Schedule of Stock Option Activity by Exercise Price Range
The following table represents weighted average remaining life as of December 31, 2016 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 $47.50
 
147,913

 
$
47.27

 
8.9 years
 
5,849

 
$
45.42

$47.51 to $52.35
 
151,527

 
51.56

 
4.9 years
 
113,328

 
51.51

$52.36 to $54.82
 
116,558

 
53.39

 
4.6 years
 
90,653

 
53.68

$54.83 to $59.81
 
68,683

 
56.33

 
3.7 years
 
64,387

 
56.17

$59.82 to $62.82
 
154,506

 
61.32

 
5.7 years
 
98,688

 
60.63

$62.83 to $111.71
 
82,351

 
67.83

 
7.1 years
 
42,471

 
69.81

Total options
 
721,538

 
$
55.38

 
6.0 years
 
415,376

 
$
56.66
Schedule of Valuation Assumptions
The following weighted-average assumptions were used for option awards issued during the years ended December 31:
 
2016
 
2015
 
2014
Expected dividends
2.8
%
 
2.2
%
 
2.1
%
Expected volatility
29.0
%
 
35.6
%
 
35.8
%
Risk-free interest rate
1.4
%
 
2.0
%
 
2.3
%
Expected term (in years)
6.5

 
7.5

 
7.5

Weighted-average grant-date fair value
$
10.46

 
$
19.57

 
$
21.26
Schedule of Allocation for Share-based Compensation Expense
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)
2016
 
2015
 
2014
Compensation expense related to stock options
$
2,010

 
$
1,861

 
$
2,053

Income tax benefit related to stock options
331

 
317

 
375

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)
2016
 
2015
 
2014
Compensation expense related to restricted stock awards and restricted share units
$
12,513

 
$
12,045

 
$
9,932

Income tax benefit related to restricted stock awards and restricted share units
4,380

 
4,215

 
3,476

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)
2016
 
2015
 
2014
Compensation expense related to phantom stock and performance units
$
12,933

 
$
12,109

 
$
5,496