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Common Stock (Details) - USD ($)
$ in Thousands
 12 Months Ended 216 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2001
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) 66,935            
Number of shares available for future use under employee savings and investment plan (in shares) 183,065            
Number of shares issued during period, employee benefit plan (in shares) 14,117 13,408 12,138        
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) 15,064 11,242 9,524 293,590      
Number of shares for future use (in shares) 306,410            
Proceeds from sale of common stock $ 670 $ 653 $ 619        
Capital Purchase Program              
Common stock              
Proceeds from sale of common stock $ 670 $ 653 $ 619