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Preferred and Common Stock (Details) - USD ($)
 1 Months Ended 12 Months Ended 192 Months Ended
Jan. 09, 2009
Nov. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
May 31, 2015
Dec. 31, 2001
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]                
Proceeds from issuance of CPP Shares $ 25,000,000              
Number of shares of common stock issuable pursuant to the Warrants, maximum (in shares) 225,904       226,819   226,819  
Exercise price of the Warrants (in dollars per share) $ 16.60           $ 16.53  
Term of warrants (in years) 10 years              
Repurchase of warrants   $ 1,750,000 $ 0 $ 1,750,000 $ 0      
Common stock                
Number of shares available to directors and employees for stock purchase or savings and investment plans (in shares)     250,000 700,000   700,000    
Number of shares issued under employee savings and investment plan (in shares)     27,273          
Number of shares available for future use under employee savings and investment plan (in shares)     222,727          
Number of shares issued during period, employee benefit plan (in shares)     12,762 14,511 13,787      
Number of shares registered with SEC for dividend reinvestment plan (in shares)               600,000
Number of shares issued during period, dividend reinvestment plan (in shares)     9,922 10,889 11,668 257,759    
Number of shares for future use (in shares)     342,241          
Number of trading days immediately preceding dividend payment date used in determining per share price of shares purchased     5 days          
Proceeds from sale of common stock     $ 632,000 $ 531,000 $ 465,000      
Capital Purchase Program                
Common stock                
Proceeds from sale of common stock     $ 632,000 $ 531,000 $ 465,000