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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2022
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, 2022 and 2021 for its pension and other postretirement benefit plans:

 
Three months ended June 30,
  
 
Pension Benefits
    
Other Postretirement Benefits
  
(dollars in thousands)
  
2022
    
2021
    
2022
    
2021
  

                       
Service cost
  
$
-
      
(11
)
    
(9
)
    
26
  
Interest cost
    
221
      
212
      
51
      
39
  
Expected return on plan assets
    
(796
)
    
(662
)
    
(333
)
    
(290
)
Amortization of net gain
    
-
      
-
      
(426
)
    
(169
)
Amortization of prior service cost
    
-
      
-
      
123
      
102
  
Net periodic benefit
  
$
(575
)
    
(461
)
    
(594
)
    
(292
)

 
Six months ended June 30,
  
 
Pension Benefits
    
Other Postretirement Benefits
  
(dollars in thousands)
  
2022
    
2021
    
2022
    
2021
  
                         
Service cost
  
$
-
      
-
      
9
      
48
  
Interest cost
    
444
      
428
      
103
      
83
  
Expected return on plan assets
    
(1,613
)
    
(1,423
)
    
(666
)
    
(617
)
Amortization of net gain
    
-
      
-
      
(504
)
    
(397
)
Amortization of prior service cost (credit)
    
-
      
-
      
(157
)
    
50
  
Net periodic benefit
  
$
(1,169
)
    
(995
)
    
(1,215
)
    
(833
)