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Common Stock (Details) - USD ($)
$ in Thousands
 12 Months Ended 288 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2024
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) 130,200     130,200      
Number of shares available for future use under employee savings and investment plan (in shares) 119,800     119,800      
Number of shares issued during period, employee benefit plan (in shares) 18,535 17,472 14,990        
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) 15,908 14,418 11,326 347,014      
Number of shares for future use (in shares) 252,986            
Proceeds from sale of common stock $ 867 $ 817 $ 796        
Capital Purchase Program              
Common stock              
Proceeds from sale of common stock $ 867 $ 817 $ 796