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Stock and Other Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Unrecognized Compensation Cost, Nonvested Awards
The following table represents expected amortization of the Company's non-vested shares issued:
(Dollars in millions)
Future Amortization of Non-Vested Shares

2018
$
9.4

2019
7.0

2020
6.7

2021
5.7

2022
3.2

2023 and thereafter
3.6

Total
$
35.6
Summary of the activity under the Incentive Plan the previous directors' plan
A summary of the activity under the 2015 Incentive Plan and related information for the three years in the period ended December 31, 2017 follows: 
 
Year Ended December 31,
(Dollars in thousands, except per share data)
2017

 
2016

 
2015

Stock-based awards, beginning of year
1,786,497

 
1,092,262

 
1,057,732

Granted
413,489

 
885,219

 
251,789

Vested
(292,341
)
 
(190,984
)
 
(210,955
)
Forfeited
—

 
—

 
(6,304
)
Stock-based awards, end of year
1,907,645

 
1,786,497

 
1,092,262

Weighted-average grant date fair value of:
 
 
 
 
 
Stock-based awards, beginning of year
$
27.18

 
$
24.72

 
$
24.01

Stock-based awards granted during the year
$
32.05

 
$
29.60

 
$
27.70

Stock-based awards vested during the year
$
25.88

 
$
24.34

 
$
25.05

Stock-based awards forfeited during the year
$
—

 
$
—

 
$
24.80

Stock-based awards, end of year
$
28.44

 
$
27.18

 
$
24.72

Grant date fair value of shares granted during the year
$
13,254

 
$
26,204

 
$
6,975
Summary of the Employee Stock Purchase Plan activity
A summary of the Employee Stock Purchase Plan activity and related information for the three years in the period ended December 31, 2017 is as follows:
 
Year Ended December 31,
(Dollars in thousands, except per share data)
2017

 
2016

 
2015

Options outstanding, beginning of year
316,321

 
340,958

 
393,902

Granted
206,824

 
198,450

 
197,640

Exercised
(32,076
)
 
(57,924
)
 
(44,462
)
Forfeited
(40,659
)
 
(22,081
)
 
(47,176
)
Expired
(132,310
)
 
(143,082
)
 
(158,946
)
Options outstanding and exercisable, end of year
318,100

 
316,321

 
340,958

Weighted-average exercise price of:
 
 
 
 
 
Options outstanding, beginning of year
$
23.69

 
$
20.70

 
$
19.17

Options granted during the year
$
25.77

 
$
24.07

 
$
23.22

Options exercised during the year
$
24.31

 
$
21.40

 
$
19.41

Options forfeited during the year
$
25.01

 
$
23.16

 
$
19.90

Options expired during the year
$
23.22

 
$
18.11

 
$
20.41

Options outstanding, end of year
$
25.00

 
$
23.69

 
$
20.70

Weighted-average fair value of options granted during the year (calculated as of the grant date)
$
6.31

 
$
5.37

 
$
5.39

Intrinsic value of options exercised during the year
$
271

 
$
634

 
$
381

Intrinsic value of options outstanding and exercisable (calculated as of December 31)
$
2,683

 
$
2,098

 
$
2,597

Exercise prices of options outstanding (calculated as of December 31)
$
25.00

 
$
23.69

 
$
20.70

Weighted-average contractual life of outstanding options (calculated as of December 31, in years)
0.8

 
0.8

 
0.8
Fair value of options issued based on weighted-average assumptions
 
2017

 
2016

 
2015

Risk-free interest rates
1.20
%
 
1.06
%
 
0.67
%
Expected dividend yields
3.70
%
 
4.64
%
 
4.79
%
Expected life (in years)
1.45

 
1.42

 
1.38

Expected volatility
20.4
%
 
17.6
%
 
21.0
%
Expected forfeiture rates
85
%
 
85
%
 
80
%