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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Accumulated Other Comprehensive Income (Loss) Balances, Net of Tax
The following is a summary of the accumulated other comprehensive (loss) income balances, net of tax:

 
  
Three months ended September 30, 2023
  
         
    Amount    
       
          Other     reclassified     Other        
          Comprehensive     from Accumulated     Comprehensive loss-        
    Balance at     loss-Before     Other Comprehensive     Three months ended     Balance at  
(dollars in thousands)
  
7/1/2023
    
Reclassifications
    
Income
    
9/30/2023
    
9/30/2023
  
 
                              
Net unrealized holding loss on securities available for sale, net of tax
  
$
(31,125
)
    
(5,212
)
  
-
      
(5,212
)
    
(36,337
)
Net change in overfunded position in pension and postretirement plans arising during the year, net of tax
    
7,588
      
-
      
-
      
-
      
7,588
  
Net change in net actuarial gain and prior service credit on pension and postretirement benefit plans, net of tax
    
(2,675
)
    
-
      
(82
)
    
(82
)
    
(2,757
)
                                         
Accumulated other comprehensive loss, net of tax
  
$
(26,212
)
    
(5,212
)
    
(82
)
    
(5,294
)
    
(31,506
)

 
Three months ended September 30, 2022
  
         
    Amount    
       
          Other     reclassified     Other        
          Comprehensive     from Accumulated     Comprehensive loss-        
    Balance at     loss-Before     Other Comprehensive     Three months ended     Balance at  
(dollars in thousands)
  
7/1/2022
    
Reclassifications
    
Income
    
9/30/2022
    
9/30/2022
  
                               
Net unrealized holding gain on securities available for sale, net of tax
  
$
(21,106
)
    
(15,522
)
    
-
      
(15,522
)
    
(36,628
)
Net change in overfunded position in pension and postretirement plans arising during the year, net of tax
    
13,706
      
-
      
-
      
-
      
13,706
  
Net change in net actuarial gain and prior service cost on pension and postretirement benefit plans, net of tax
    
(2,022
)
    
-
      
(265
)
    
(265
)
    
(2,287
)
                                         
Accumulated other comprehensive loss, net of tax
  
$
(9,422
)
    
(15,522
)
    
(265
)
    
(15,787
)
    
(25,209
)

 
  
Nine months ended September 30, 2023
  
         
    Amount    
       
          Other     reclassified     Other        
          Comprehensive     from Accumulated     Comprehensive loss-        
    Balance at     loss-Before     Other Comprehensive
     Nine months ended     Balance at  
(dollars in thousands)
  
1/1/2023
    
Reclassifications
    
Income
    
9/30/2023
    
9/30/2023
  
 
                              
Net unrealized holding loss on securities available for sale, net of tax
  
$
(32,271
)
  

(4,066
)
  

-
    

(4,066
)
  

(36,337
)
Net change in overfunded position in pension and postretirement plans arising during the year, net of tax
    
7,588
      
-
      
-
      
-
      
7,588
  
Net change in net actuarial gain and prior service cost on pension and postretirement benefit plans, net of tax
    
(2,511
)
    
-
      
(246
)
    
(246
)
    
(2,757
)
                                         
Accumulated other comprehensive loss, net of tax
  
$
(27,194
)
  

(4,066
)
  

(246
)
  

(4,312
)
  

(31,506
)

 
Nine months ended September 30, 2022
  
         
    Amount    
       
          Other     reclassified     Other        
          Comprehensive     from Accumulated     Comprehensive loss-        
    Balance at     loss-Before     Other Comprehensive     Nine months ended     Balance at  
(dollars in thousands)
  
1/1/2022
    
Reclassifications
    
Income
    
9/30/2022
    
9/30/2022
  
                               
Net unrealized holding gain on securities available for sale, net of tax
  
$
(26
)
    
(36,602
)
  
-
      
(36,602
)
    
(36,628
)
Net change in overfunded position in pension and postretirement plans arising during the year, net of tax
    
13,706
      
-
      
-
      
-
      
13,706
  
Net change in net actuarial gain and prior service credit on pension and postretirement benefit plans, net of tax
    
(1,533
)
    
-
      
(754
)
    
(754
)
    
(2,287
)
                                         
Accumulated other comprehensive income (loss), net of tax
  
$
12,147
      
(36,602
)
    
(754
)
    
(37,356
)
    
(25,209
)
Reclassifications out of Accumulated Other Comprehensive Loss
The following represents the reclassifications out of accumulated other comprehensive income (loss) for the three and nine months ended September 30, 2023 and 2022:

(dollars in thousands)
  
Three months ended
    
Nine months ended
    
   
September 30,
    
September 30,
    
   
2023
    
2022
    
2023
    
2022
   Affected Line Item in Financial Statements
Amortization of pension and postretirement benefit items:
                                  
Amortization of net actuarial gain
  
$
115
      
280
    
$
343
      
784
   Salaries and employee benefits
Amortization of prior service credit (cost)
   
(4
)
    
78
   
(10
)
    
235
   Salaries and employee benefits
Income tax (benefit) expense
    
(29
)
    
(93
)
    
(87
)
    
(265
)
 Income taxes
Net of tax
    
82
      
265
      
246
      
754
    
                                                 
Total reclassifications, net of tax
  
$
82
      
265
    
$
246
      
754