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Nature of Banking Activities and Significant Accounting Policies (Narrative) (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
loan
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
shares
Property Plant And Equipment [Line Items]      
Ownership percentage in subsidiaries 100.00%    
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 0
Number of shares of common stock able to be repurchased 150,000    
Treasury Stock, Shares, Retired 67,189 53,988  
Stock Repurchased and Retired During Period, Value | $ $ 27.60 $ 32.79  
Maximum numbers of shares that may yet be purchased under plan 121,425    
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 911    
Total outstanding balance of loans | $ $ 81,300,000