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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2020
Benefit Plans [Abstract]  
Net Periodic Benefit
The table below outlines the components of the Company's net periodic benefit recognized during the three and six months ended June 30, 2020 and 2019 for its pension and other postretirement benefit plans:

 
Three months ended June 30,
  
 
Pension Benefits
    
Other Postretirement Benefits
  
(dollars in thousands)
  
2020
    
2019
    
2020
    
2019
  
                         
Service cost
  
$
7
      
13
      
21
      
14
  
Interest cost
    
272
      
307
      
58
      
60
  
Expected return on plan assets
    
(691
)
    
(654
)
    
(296
)
    
(247
)
Amortization of net loss (gain)
    
5
      
30
      
(148
)
    
(50
)
Amortization of prior service cost
    
-
      
-
      
(49
)
    
(82
)
Net periodic benefit
  
$
(407
)
    
(304
)
    
(414
)
    
(305
)

 
Six months ended June 30,
  
 
Pension Benefits
    
Other Postretirement Benefits
  
(dollars in thousands)
  
2020
    
2019
    
2020
    
2019
  
                         
Service cost
  
$
19
      
21
      
40
      
32
  
Interest cost
    
538
      
622
      
112
      
120
  
Expected return on plan assets
    
(1,510
)
    
(1,406
)
    
(592
)
    
(495
)
Amortization of net loss (gain)
    
5
      
30
      
(314
)
    
(98
)
Amortization of prior service cost
    
-
      
-
      
(98
)
    
(167
)
Net periodic benefit
  
$
(948
)
    
(733
)
    
(852
)
    
(608
)