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Stock and Other Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2018
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

2019
$
8.6

2020
8.1

2021
7.0

2022
4.5

2023
2.3

2024 and thereafter
2.8

Total
$
33.3
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, 2018 follows: 
 
Year Ended December 31,
(Dollars in thousands, except per share data)
2018

 
2017

 
2016

Stock-based awards, beginning of year
1,907,645

 
1,786,497

 
1,092,262

Granted
273,012

 
413,489

 
885,219

Vested
(410,794
)
 
(292,341
)
 
(190,984
)
Stock-based awards, end of year
1,769,863

 
1,907,645

 
1,786,497

Weighted-average grant date fair value of:
 
 
 
 
 
Stock-based awards, beginning of year
$
28.44

 
$
27.18

 
$
24.72

Stock-based awards granted during the year
$
29.72

 
$
32.05

 
$
29.60

Stock-based awards vested during the year
$
25.32

 
$
25.88

 
$
24.34

Stock-based awards, end of year
$
29.36

 
$
28.44

 
$
27.18

Grant date fair value of shares granted during the year
$
8,114

 
$
13,254

 
$
26,204
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, 2018 is as follows:
 
Year Ended December 31,
(Dollars in thousands, except per share data)
2018

 
2017

 
2016

Options outstanding, beginning of year
318,100

 
316,321

 
340,958

Granted
203,836

 
206,824

 
198,450

Exercised
(16,716
)
 
(32,076
)
 
(57,924
)
Forfeited
(40,897
)
 
(40,659
)
 
(22,081
)
Expired
(135,790
)
 
(132,310
)
 
(143,082
)
Options outstanding and exercisable, end of year
328,533

 
318,100

 
316,321

Weighted-average exercise price of:
 
 
 
 
 
Options outstanding, beginning of year
$
25.00

 
$
23.69

 
$
20.70

Options granted during the year
$
27.30

 
$
25.77

 
$
24.07

Options exercised during the year
$
24.01

 
$
24.31

 
$
21.40

Options forfeited during the year
$
24.06

 
$
25.01

 
$
23.16

Options expired during the year
$
23.55

 
$
23.22

 
$
18.11

Options outstanding, end of year
$
24.17

 
$
25.00

 
$
23.69

Weighted-average fair value of options granted during the year (calculated as of the grant date)
$
7.81

 
$
6.31

 
$
5.37

Intrinsic value of options exercised during the year
$
71

 
$
271

 
$
634

Intrinsic value of options outstanding and exercisable (calculated as of December 31)
$
1,402

 
$
2,683

 
$
2,098

Exercise prices of options outstanding (calculated as of December 31)
$
24.17

 
$
25.00

 
$
23.69

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
 
2018

 
2017

 
2016

Risk-free interest rates
1.89
%
 
1.20
%
 
1.06
%
Expected dividend yields
3.66
%
 
3.70
%
 
4.64
%
Expected life (in years)
1.45

 
1.45

 
1.42

Expected volatility
28.4
%
 
20.4
%
 
17.6
%
Expected forfeiture rates
85
%
 
85
%
 
85
%