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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2026
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 income (loss) balances, net of tax:

   
Three months ended March 31, 2026
  
 
              
Amount
              
         
Other
    
reclassified
    
Other
        
 
        
Comprehensive
    
from Accumulated
    
Comprehensive loss-
        
   
Balance at
    
loss-Before
    
Other Comprehensive
    
Three months ended
    
Balance at
  
(dollars in thousands)
  
12/31/2025
    
Reclassifications
    
Income
    
3/31/2026
    
3/31/2026
  
         
                   
Net unrealized holding loss on securities available for
sale, net of tax
  
$
(12,055
)
  
$
(1,266
)
  
$
-
    
$
(1,266
)
  
$
(13,321
)
Net change in overfunded position in pension and
postretirement plans arising during the year, net of tax
    
26,962
      
-
      
-
      
-
      
26,962
  
Net change in net actuarial gain and prior service cost on
pension and postretirement benefit plans, net of tax
    
(4,883
)
    
-
      
(517
)
    
(517
)
    
(5,400
)
Accumulated other comprehensive income (loss), net of tax
  
$
10,024
    
$
(1,266
)
  
$
(517
)
  
$
(1,783
)
  
$
8,241
  
 
  
Three months ended March 31, 2025
  
 
              
Amount
              
 
        
Other
    
reclassified
    
Other Comprehensive
        
 
        
Comprehensive
    
from Accumulated
    
income-
        
 
  
Balance at
    
income-Before
    
Other Comprehensive
    
Three months ended
    
Balance at
  
(dollars in thousands)
  
12/31/2024
    
Reclassifications
    
Loss
    
3/31/2025
    
3/31/2025
  
 
                              
Net unrealized holding gain on securities available for
sale, net of tax
  
$
(21,713
)
  
$
3,948
    
$
-
    
$
3,948
    
$
(17,765
)
Net change in overfunded position in pension and
postretirement plans arising during the year, net of tax
    
21,266
      
-
      
-
      
-
      
21,266
  
Net change in net actuarial gain and prior service cost on
pension and postretirement benefit plans, net of tax
    
(3,414
)
    
-
      
(219
)
    
(219
)
    
(3,633
)
 
                                        
Accumulated other comprehensive loss (income), net of tax
  
$
(3,861
)
  
$
3,948
    
$
(219
)
  
$
3,729
    
$
(132
)
Reclassifications out of Accumulated Other Comprehensive Income (Loss)
The following table represents the reclassifications out of accumulated other comprehensive loss for the three months ended March 31, 2026 and 2025:

(dollars in thousands)
  
Three months ended
  
 
 
  
March 31,
  
 
 
  
2026
    
2025
  
Affected Line Item in Financial Statements
Amortization of pension and postretirement benefit items:
            
   
Amortization of net actuarial gain
  
$
701
    
$
297
  
Salaries and employee benefits
Amortization of prior service cost
    
(3
)
    
(3
)
Salaries and employee benefits
Income tax benefit
    
(181
)
    
(75
)
Income taxes
Net of tax
    
517
      
219
  
 
 
                
Total reclassifications, net of tax
  
$
517
    
$
219