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Preferred and Common Stock (Details) - USD ($)
 1 Months Ended 12 Months Ended 216 Months Ended
Jan. 09, 2009
Nov. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
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  
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 $ 0 $ 1,750,000      
Common stock                
Number of shares available to directors and employees for stock purchase or savings and investment plans (in shares)       700,000 250,000      
Number of shares issued under employee savings and investment plan (in shares)     39,411     39,411    
Number of shares available for future use under employee savings and investment plan (in shares)     210,589     210,589    
Number of shares issued during period, employee benefit plan (in shares)     12,138 12,762 14,511      
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)     9,524 9,922 10,889 267,284    
Number of shares for future use (in shares)     332,716          
Number of trading days immediately preceding dividend payment date used in determining per share price of shares purchased     5 years          
Proceeds from sale of common stock     $ 619,000 $ 632,000 $ 531,000      
Capital Purchase Program                
Common stock                
Proceeds from sale of common stock     $ 619,000 $ 632,000 $ 531,000