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Common Stock (Details) - USD ($) $ in Thousands | 12 Months Ended | 252 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2021 | 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) | 79,203 |  |  | 79,203 |  |  |
Number of shares available for future use under employee savings and investment plan (in shares) | 170,797 |  |  | 170,797 |  |  |
Number of shares issued during period, employee benefit plan (in shares) | 12,267 | 14,117 | 13,408 |  |  |  |
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) | 11,772 | 15,064 | 11,242 | 305,362 |  |  |
Number of shares for future use (in shares) | 294,638 |  |  |  |  |  |
Proceeds from sale of common stock | $ 689 | $ 670 | $ 653 |  |  |  |
Capital Purchase Program |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |
Proceeds from sale of common stock | $ 689 | $ 670 | $ 653 |  |  |  |

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