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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 |  |  |  |

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