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Nature of Banking Activities and Significant Accounting Policies (Narrative) (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
loan
shares
Dec. 31, 2020
USD ($)
loan
shares
Property Plant And Equipment [Line Items]    
Ownership percentage in subsidiaries 100.00%  
Sale of Non Mortgage Loans | $ $ 100,000,000  
Period interest on mortgage loans is discontinued 120 days  
Period Interest on commercial loans discontinued 90 days  
Credit card loans and other personal loans are charged off 180 days  
Limit of the estimated appraised value of the furnished home 80.00%  
Authorized issuance of shares of common stock 500,000  
"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  
Treasury Stock, Shares, Retired 4,749 67,189
Stock Repurchased and Retired During Period, Value | $ $ 31.26 $ 27.60
Maximum numbers of shares that may yet be purchased under plan 148,825  
Building [Member] | Minimum [Member]    
Property Plant And Equipment [Line Items]    
Estimated useful lives 10 years  
Building [Member] | Maximum [Member]    
Property Plant And Equipment [Line Items]    
Estimated useful lives 39 years  
Furniture and equipment [Member] | Minimum [Member]    
Property Plant And Equipment [Line Items]    
Estimated useful lives 3 years  
Furniture and equipment [Member] | Maximum [Member]    
Property Plant And Equipment [Line Items]    
Estimated useful lives 10 years  
Paycheck Protection Program Loans [Member]    
Property Plant And Equipment [Line Items]    
Number of loans | loan 152 911
Total outstanding balance of loans | $ $ 15,900,000 $ 81,300,000