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Nature of Operations and Summary of Significant Accounting Policies (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
Location
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
Accounting Policies [Abstract]      
Other Real Estate, Foreclosed Assets, and Repossessed Assets $ 406 $ 439  
Number of location of banking operations | Location 31    
Period for federal fund sold 1 day    
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of mortgages serviced for others $ 248,756 264,206  
Capitalized mortgage loans on real estate carrying amount 2,422 2,559  
Corporation recorded servicing fee revenue 630 669 $ 747
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Present value of the post retirement benefits payable 2,515 2,905  
Periodic policy maintenance costs $ 173 $ 61 $ 33
Director [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Eligible shares, total | shares 154,119 207,840  
Common stock, shares held in Rabbi Trust | shares 150,581 154,879  
Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Useful lives of the related assets 3 years    
Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Useful lives of the related assets 40 years    
Loans      
Condensed Balance Sheet Statements, Captions [Line Items]      
Interest Receivable $ 5,920    
Debt Securities [Member]      
Condensed Balance Sheet Statements, Captions [Line Items]      
Interest Receivable $ 2,247