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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2021
Benefit Plans [Abstract]  
Net Periodic Benefit
The table below outlines the components of the Company’s net periodic benefit recognized during the three and nine months ended September 30, 2021 and 2020 for its pension and other postretirement benefit plans:

 
Three months ended September 30,
  
 
Pension Benefits
    
Other Postretirement Benefits
  
(dollars in thousands)
  
2021
    
2020
    
2021
    
2020
  

                       
Service (credit) cost
  
$
-
      
9
      
9
      
15
  
Interest cost
    
214
      
269
      
60
      
40
  
Expected return on plan assets
    
(712
)
    
(755
)
    
(274
)
    
(296
)
Amortization of net loss (gain)
    
-
      
(5
)
    
(137
)
    
(217
)
Amortization of prior service cost (credit)
    
-
      
-
      
177
      
(49
)
Net periodic benefit
  
$
(498
)
    
(482
)
    
(165
)
    
(507
)

 
Nine months ended September 30,
  
 
Pension Benefits
    
Other Postretirement Benefits
  
(dollars in thousands)
  
2021
    
2020
    
2021
    
2020
  
                         
Service cost
  
$
-
      
28
      
57
      
55
  
Interest cost
    
642
      
807
      
143
      
152
  
Expected return on plan assets
    
(2,135
)
    
(2,265
)
    
(891
)
    
(887
)
Amortization of net loss (gain)
    
-
      
-
      
(534
)
    
(531
)
Amortization of prior service cost (credit)
    
-
      
-
      
227
      
(147
)
Net periodic benefit
  
$
(1,493
)
    
(1,430
)
    
(998
)
    
(1,358
)