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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2025
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 for the three and nine months ended September 30, 2025 and 2024:

   
Three months ended September 30, 2025
  
               
Amount
              
         
Other
    
reclassified
    
Other
        
         
Comprehensive
    
from Accumulated
    
Comprehensive income-
        
   
Balance at
    
income-Before
    
Other Comprehensive
    
Three months ended
    
Balance at
  
(dollars in thousands)
  
7/1/2025
    
Reclassifications
    
Income
    
9/30/2025
    
9/30/2025
  
                               

                             
Net unrealized holding gain on securities available for sale, net of tax
  
$
(15,429
)
    
1,673
      
-
      
1,673
      
(13,756
)
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
    
(4,174
)
    
-
      
(381
)
    
(381
)
    
(4,555
)
                                         
Accumulated other comprehensive income, net of tax
  
$
1,663
      
1,673
      
(381
)
    
1,292
      
2,955
  

   
Three months ended September 30, 2024
  
               
Amount
              
         
Other
    
reclassified
    
Other Comprehensive
        
         
Comprehensive
    
from Accumulated
    
income-
        
   
Balance at
    
income-Before
    
Other Comprehensive
    
Three months ended
    
Balance at
  
(dollars in thousands)
  
7/1/2024
    
Reclassifications
    
Loss
    
9/30/2024
    
9/30/2024
  
                               

                             
Net unrealized holding gain on securities available for sale, net of tax
  
$
(24,635
)
    
7,816
      
-
      
7,816
      
(16,819
)
Net change in overfunded position in pension and postretirement plans arising during the year, net of tax
    
13,476
      
-
      
-
      
-
      
13,476
  
Net change in net actuarial gain and prior service cost on pension and postretirement benefit plans, net of tax
    
(3,109
)
    
-
      
(148
)
    
(148
)
    
(3,257
)
                                         
Accumulated other comprehensive loss, net of tax
  
$
(14,268
)
    
7,816
      
(148
)
    
7,668
      
(6,600
)

   
Nine months ended September 30, 2025
  
               
Amount
              
         
Other
    
reclassified
    
Other Comprehensive
        
         
Comprehensive
    
from Accumulated
    
income-
        
   
Balance at
    
income-Before
    
Other Comprehensive
    
Nine months ended
    
Balance at
  
(dollars in thousands)
  
1/1/2025
    
Reclassifications
    
Income
    
9/30/2025
    
9/30/2025
  
                               

                             
Net unrealized holding gain on securities available for sale, net of tax
  
$
(21,713
)
  
$
7,957
      
-
    
$
7,957
    
$
(13,756
)
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
)
    
-
      
(1,141
)
    
(1,141
)
    
(4,555
)
                                         
Accumulated other comprehensive income, net of tax
  
$
(3,861
)
  
$
7,957
    
$
(1,141
)
  
$
6,816
    
$
2,955
  

   
Nine months ended September 30, 2024
  
               
Amount
              
         
Other
    
reclassified
    
Other Comprehensive
        
         
Comprehensive
    
from Accumulated
    
income-
        
   
Balance at
    
income-Before
    
Other Comprehensive
    
Nine months ended
    
Balance at
  
(dollars in thousands)
  
1/1/2024
    
Reclassifications
    
Loss
    
9/30/2024
    
9/30/2024
  
                               

                             
Net unrealized holding loss on securities available for sale, net of tax
  
$
(23,899
)
  
$
7,080
    
$
-
    
$
7,080
    
$
(16,819
)
Net change in overfunded position in pension and postretirement plans arising during the year, net of tax
    
13,476
      
-
      
-
      
-
      
13,476
  
Net change in net actuarial gain and prior service credit on pension and postretirement benefit plans, net of tax
    
(2,814
)
    
-
      
(443
)
    
(443
)
    
(3,257
)
                                         
Accumulated other comprehensive loss, net of tax
  
$
(13,237
)
  
$
7,080
    
$
(443
)
  
$
6,637
    
$
(6,600
)
Reclassifications out of Accumulated Other Comprehensive Income (Loss)
The following represents the reclassifications out of accumulated other comprehensive income (loss) for the three and nine months ended September 30, 2025 and 2024:

(dollars in thousands)
  
Three months ended
    
Nine months ended
      
   
September 30,
    
September 30,
      
   
2025
    
2024
    
2025
    
2024
    
Affected Line Item in Financial Statements
Amortization of pension and postretirement benefit items:
                                    
Amortization of net actuarial gain
  
$
517
    
$
203
    
$
1,551
    
$
608
    
Salaries and employee benefits
Amortization of prior service cost
    
(2
)
    
(4
)
    
(9
)
    
(10
)
  
Salaries and employee benefits
Income tax benefit
    
(134
)
    
(51
)
    
(401
)
    
(155
)
  
Income taxes
Net of tax
    
381
      
148
      
1,141
      
443
      
                                   
Total reclassifications, net of tax
  
$
381
    
$
148
    
$
1,141
    
$
443