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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2023
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, 2023 and 2022 for its pension and other postretirement benefit plans:

 
Three months ended September 30,
  
 
Pension Benefits
    
Other Postretirement Benefits
  
(dollars in thousands)
  
2023
    
2022
    
2023
    
2022
  

                       
Service cost
  
$
-
    
$
-
    
$
2
    
$
4
  
Interest cost
    
304
      
222
      
65
      
52
  
Expected return on plan assets
    
(672
)
    
(807
)
    
(288
)
    
(333
)
Amortization of net gain
    
-
      
-
      
(115
)
    
(280
)
Amortization of prior service cost (credit)
   
-
      
-
      
4
      
(78
)
Net periodic benefit
  
$
(368
)
  
$
(585
)
  
$
(332
)
  
$
(635
)


Nine months ended September 30,
  

Pension Benefits
  
Other Postretirement Benefits
  
(dollars in thousands)
2023
  
2022
  
2023
  
2022
  

               
Service cost
  
$
-
    
$
-
    
$
7
    
$
13
  
Interest cost
    
910
      
666
      
197
      
155
  
Expected return on plan assets
    
(2,013
)
    
(2,420
)
    
(867
)
    
(999
)
Amortization of net gain
    
-
      
-
      
(343
)
    
(784
)
Amortization of prior service cost (credit)
    
-
      
-
      
10
      
(235
)
Net periodic benefit
  
$
(1,103
)
  
$
(1,754
)
  
$
(996
)
  
$
(1,850
)