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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The following table summarizes the change in projected benefit obligation and funded status as a result of the remeasurement and the aggregate settlements for the three months ended September 30, 2018:
 
As of
September 30, 2018
(Dollars in thousands)
December 31,
Before
Impact of
After
Funded status:
2017
Settlements
Settlement
Settlement
Projected benefit obligation
$
12,991

$
12,006

$
(510
)
$
11,496

Fair value of plan assets
8,493

12,006

(510
)
11,496

   Funded status
$
(4,498
)
$
—

$
—

$
—

Gross unrealized loss
$
5,458

$
4,196

$
176

$
4,020

Assumptions:
 
 
 
 
   Discount rate
3.40
%
4.00
%

4.00
%
  Expected return on plan assets
7.50
%
7.50
%

7.50
%
Schedule of Net Benefit Costs
The following tables detail the components of the net periodic cost for the plans:
 
 
Pension Benefits
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
(Dollars in thousands)
2018
2017
 
2018
2017
Interest cost
$
104

$
112

 
$
314

$
338

Expected return on plan assets
(147
)
(138
)
 
(440
)
(415
)
Amortization of net loss
29

26

 
84

77

Settlement of benefit obligation
176

—

 
—

—

Net periodic cost
$
162

$
—

 
$
(42
)
$
—

 
Postretirement Benefits
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
(Dollars in thousands)
2018
2017
 
2018
2017
Interest cost
$
—

$
1

 
$
2

$
3

Amortization of net gain
(1
)
(1
)
 
(4
)
(5
)
Net periodic cost
$
(1
)
$
—

 
$
(2
)
$
(2
)