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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
The following tables detail the components of the net periodic cost for the plans:
 
 
Pension Benefits
 
 
 
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
(Dollars in thousands)
2018
2017
 
2018
2017
Interest cost
$
105

$
113

 
$
210

$
226

Expected return on plan assets
(146
)
(139
)
 
(293
)
(277
)
Amortization of net loss
27

26

 
55

51

Net periodic cost
$
(14
)
$
—

 
$
(28
)
$
—

 
Postretirement Benefits
 
 
 
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
(Dollars in thousands)
2018
2017
 
2018
2017
Interest cost
$
1

$
1

 
$
2

$
2

Amortization of net gain
(1
)
(2
)
 
(3
)
(4
)
Net periodic cost
$
—

$
(1
)
 
$
(1
)
$
(2
)