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Benefit Plans (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2021 and 2020 for its pension and other postretirement benefit plans:

 
Three months ended June 30,
  
 
Pension Benefits
    
Other Postretirement Benefits
  
(dollars in thousands)
  
2021
    
2020
    
2021
    
2020
  
                         
Service (credit) cost
  
$
(11
)
    
7
      
26
      
21
  
Interest cost
    
212
      
272
      
39
      
58
  
Expected return on plan assets
    
(662
)
    
(691
)
    
(290
)
    
(296
)
Amortization of net loss (gain)
    
-
      
5
      
(169
)
    
(148
)
Amortization of prior service cost (credit)
    
-
      
-
      
102
      
(49
)
Net periodic benefit
  
$
(461
)
    
(407
)
    
(292
)
    
(414
)

 
Six months ended June 30,
  
 
Pension Benefits
    
Other Postretirement Benefits
  
(dollars in thousands)
  
2021
    
2020
    
2021
    
2020
  
                         
Service cost
  
$
-
      
19
      
48
      
40
  
Interest cost
    
428
      
538
      
83
      
112
  
Expected return on plan assets
    
(1,423
)
    
(1,510
)
    
(617
)
    
(592
)
Amortization of net loss (gain)
    
-
      
5
      
(397
)
    
(314
)
Amortization of prior service cost (credit)
    
-
      
-
      
50
      
(98
)
Net periodic benefit
  
$
(995
)
    
(948
)
    
(833
)
    
(852
)