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Nature of Banking Activities and Significant Accounting Policies (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Jun. 21, 2023
May 16, 2023
Property Plant And Equipment [Line Items]        
Ownership percentage in subsidiaries 100.00%      
Accrued interest receivable $ 4,600,000 $ 3,500,000    
Sale of Non Mortgage Loans $ 59,600,000      
Limit of the estimated appraised value of the furnished home 80.00%      
Reserve credit losses for Unfunded Commitments $ 479,000 $ 65,000    
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 2,500,000      
initial adjustment for the adoption of credit losses for Unfunded Commitments 406,000      
Provision for Other Credit Losses $ 8,000      
Stock incentive plan, authorized common stock       250,000
"More likely than not" threshold 50.00%      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 0    
Number of shares of common stock able to be repurchased     150,000  
Shares repurchase and Moved 8,531 4,442    
Stock Repurchased and Retired During Period, Value $ 35.34 $ 34.79    
Maximum numbers of shares that may yet be purchased under plan 145,059      
Derivatives used in Net Investment Hedge, Net of Tax $ 2,000,000      
Building [Member] | Minimum        
Property Plant And Equipment [Line Items]        
Estimated useful lives 10 years      
Building [Member] | Maximum        
Property Plant And Equipment [Line Items]        
Estimated useful lives 39 years      
Furniture and equipment [Member] | Minimum        
Property Plant And Equipment [Line Items]        
Estimated useful lives 3 years      
Furniture and equipment [Member] | Maximum        
Property Plant And Equipment [Line Items]        
Estimated useful lives 10 years