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Significant Accounting Policies - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
USD ($)
Location
segment
shares
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of location of banking operations | Location 31    
Number of operating segments | segment 1    
Number of reportable segments | segment 1    
Period for federal fund sold 1 day    
Unpaid principal balance of mortgages serviced for others $ 211,456 $ 231,143  
Capitalized mortgage loans on real estate carrying amount 1,929 2,185  
Corporation recorded servicing fee revenue 553 588 $ 630
Foreclosed and repossessed assets 938 544  
Present value of the post retirement benefits payable 2,696 2,687  
Periodic policy maintenance costs $ 150 $ 172 $ 173
Director      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Eligible shares, Unissued | shares 98,611 101,493  
Common stock, shares held in Rabbi Trust | shares 129,618 142,535  
Minimum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Useful lives of the related assets (in years) 3 years    
Maximum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Useful lives of the related assets (in years) 40 years    
Debt Securities      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest receivable $ 1,723 $ 1,701  
Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest receivable $ 6,666 $ 6,384