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Capital Purchase Program (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |
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Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Purchase Agreement [Member] | Mar. 31, 2013 Fixed Rate Cumulative Perpetual Preferred Stock, Series A [Member] | Aug. 29, 2012 Fixed Rate Cumulative Perpetual Preferred Stock, Series A [Member] | Mar. 31, 2013 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 |  | $ 1,000 |
Number of shares |  |  |  |  |  | 695 |
Exercise price | 4.00 |  |  |  |  | 1.25 |
Aggregate purchase price |  |  | $ 13.9 |  |  |  |
Closing of sale |  |  | Mar. 13, 2009 |  |  |  |
Increase in total capital |  |  |  |  |  | $ 13.9 |
Cumulative dividends percentage until March 13, 2014 |  |  | 5.00% |  |  |  |
Cumulative dividend thereafter |  |  | 9.00% |  |  |  |
Cumulative dividends of warrant preferred stock |  |  |  |  |  | 9.00% |
Sale of stock, price |  |  |  |  | $ 882.50 |  | $ 912.50
Capital Purchase Program (Additional Textual) [Abstract] |  |  |  |  |  |  |
Discount on preferred stock amortized period | 5 years |  |  |  |  |  |

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- Definition Discount on preferred stock amortized period. + References No definition available. + Details
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