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Preferred and Common Stock (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended | 192 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 09, 2009 | Nov. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | May 31, 2015 | Dec. 31, 2001
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |
Proceeds from issuance of CPP Shares | $ 25,000,000 |  |  |  |  |  |  |
Number of shares of common stock issuable pursuant to the Warrants, maximum (in shares) | 225,904 |  |  |  | 226,819 |  | 226,819 |
Exercise price of the Warrants (in dollars per share) | $ 16.60 |  |  |  |  |  | $ 16.53 |
Term of warrants (in years) | 10 years |  |  |  |  |  |  |
Repurchase of warrants |  | $ 1,750,000 | $ 0 | $ 1,750,000 | $ 0 |  |  |
Common stock |  |  |  |  |  |  |  |
Number of shares available to directors and employees for stock purchase or savings and investment plans (in shares) |  |  | 250,000 | 700,000 |  | 700,000 |  |
Number of shares issued under employee savings and investment plan (in shares) |  |  | 27,273 |  |  |  |  |
Number of shares available for future use under employee savings and investment plan (in shares) |  |  | 222,727 |  |  |  |  |
Number of shares issued during period, employee benefit plan (in shares) |  |  | 12,762 | 14,511 | 13,787 |  |  |
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) |  |  | 9,922 | 10,889 | 11,668 | 257,759 |  |
Number of shares for future use (in shares) |  |  | 342,241 |  |  |  |  |
Number of trading days immediately preceding dividend payment date used in determining per share price of shares purchased |  |  | 5 days |  |  |  |  |
Proceeds from sale of common stock |  |  | $ 632,000 | $ 531,000 | $ 465,000 |  |  |
Capital Purchase Program |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |
Proceeds from sale of common stock |  |  | $ 632,000 | $ 531,000 | $ 465,000 |  |  |

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