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Capital Purchase Program (Details) (USD $) In Millions, except Share data, unless otherwise specified | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |
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Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2012 Purchase Agreement [Member] | Sep. 30, 2012 Fixed Rate Cumulative Perpetual Preferred Stock, Series A [Member] | Aug. 29, 2012 Fixed Rate Cumulative Perpetual Preferred Stock, Series A [Member] | Sep. 30, 2012 Fixed Rate Cumulative Perpetual Preferred Stock, Series B [Member] | Aug. 29, 2012 Fixed Rate Cumulative Perpetual Preferred Stock, Series B [Member]
Capital Purchase Program (Textual) [Abstract] |  |  |  |  |  |  |
Number of shares |  |  |  | 13,900 |  |  |
Par value |  |  |  | $ 1.25 |  |  |
Liquidation preference | $ 1,000 | $ 1,000 |  | $ 1,000 |  |  |
Number of shares |  |  |  |  |  | 695 |
Exercise price |  |  |  |  |  | 1.25 |
Aggregate purchase price |  |  | $ 13.9 |  |  |  |
Closing of sale |  |  | Mar. 13, 2009 |  |  |  |
Cumulative dividends percentage untill March 13, 2014 |  |  | 5.00% |  |  |  |
Cumulative dividend thereafter |  |  | 9.00% |  |  |  |
Discount on preferred stock amortized period | 5 years |  |  |  |  |  |
Increase in total Capital |  |  |  |  |  | $ 13.9 |
Cumulative dividends of warrant preferred stock |  |  |  |  |  | 9.00% |
Sale of stock, price |  |  |  |  | $ 882.50 |  | $ 912.50

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