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Preferred and Common Stock (Details) - USD ($)
 12 Months Ended 180 Months Ended
Mar. 28, 2013
Jan. 09, 2009
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 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)   225,904 226,819 225,904 225,904 226,819  
Exercise price of the Warrants (in dollars per share)   $ 16.60 $ 16.53     $ 16.53  
Common stock              
Number of shares available to directors and employees for stock purchase or savings and investment plans (in shares)     700,000     700,000  
Number of shares issued under employee savings and investment plan (in shares)     562,224     562,224  
Number of shares available for future use under employee savings and investment plan (in shares)     137,776     137,776  
Number of shares issued during period, employee benefit plan (in shares)     13,787 14,638 11,385    
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)     11,668 12,686 12,008 236,943  
Number of shares for future use (in shares)     363,057        
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 (in shares) 760,771            
Proceeds from sale of common stock $ 11,649,000   $ 465,000 $ 457,000 $ 11,973,000    
CPP shares $ 10,000,000            
Proceeds from sale of common stock     465,000 457,000 11,973,000    
Capital Purchase Program              
Common stock              
Proceeds from sale of common stock     $ 465,000 $ 457,000 $ 324,000