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Nature of Banking Activities and Significant Accounting Policies (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Jun. 15, 2016
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  
Number of shares of common stock able to be repurchased   150,000
Treasury Stock, Shares, Retired 89,607  
Stock Repurchased and Retired During Period, Value $ 23.92  
Maximum numbers of shares that may yet be purchased under plan 60,393  
Building [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 39 years  
Building [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 10 years  
Furniture and equipment [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 10 years  
Furniture and equipment [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 3 years