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Common Stock (Details) - USD ($)
$ in Thousands
 12 Months Ended 264 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2022
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2001
Common stock              
Number of shares available to directors and employees for stock purchase or savings and investment plans (in shares)         250,000 700,000  
Number of shares issued under employee savings and investment plan (in shares) 94,193     94,193      
Number of shares available for future use under employee savings and investment plan (in shares) 155,807     155,807      
Number of shares issued during period, employee benefit plan (in shares) 14,990 12,267 14,117        
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) 11,326 11,772 15,064 316,688      
Number of shares for future use (in shares) 283,312            
Proceeds from sale of common stock $ 796 $ 689 $ 670        
Capital Purchase Program              
Common stock              
Proceeds from sale of common stock $ 796 $ 689 $ 670