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Financial Information - (Tables)
 3 Months Ended
Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Life Settlement Contracts
The amounts reclassified are presented in the table below.

 
Three Months Ended
March 31, 2017
 
Fiscal Years Ended December 31
(Dollars in thousands)
 
2017
 
2016
 
2015
 
 
 
 
 
 
 
 
Proceeds from BOLI
$
281

 
$
3,785

 
$
2,740

 
$
2,425
Schedule of Net Benefit Costs
The amounts reclassified are presented in the table below.

 
Three Months Ended
March 31, 2017
 
Fiscal Years Ended December 31
(Dollars in thousands)
 
2017
 
2016
 
2015
 
 
 
 
 
 
 
 
Net periodic benefit cost reclassified
$
438

 
$
1,946

 
$
(843
)
 
$
(1,168
)
The components of net periodic benefit cost for the three months ended March 31 are as follows:
 
 
 
Pension Benefits
 
Other Benefits
(Dollars in thousands)
 
2018
 
2017
 
2018
 
2017
Components of net periodic benefit cost
 
 
 
 
 
 
 
 
Service cost
 
$
10

 
$
9

 
$
33

 
$
27

Interest cost
 
6,986

 
7,379

 
327

 
326

Expected return on plan assets
 
(8,225
)
 
(8,891
)
 
(269
)
 
(237
)
Amortization of unrecognized:
 
 
 
 
 
 
 
 
Prior service cost/(credit)
 
—

 
13

 
—

 
24

Actuarial (gain)/loss
 
2,956

 
2,380

 
(91
)
 
(142
)
Net periodic benefit cost/(credit)
 
$
1,727

 
$
890

 
$
—

 
$
(2
)