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Capital (Details) (USD $)
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0 Months Ended |
1 Months Ended |
12 Months Ended |
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Aug. 25, 2011
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Sep. 30, 2011
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Dec. 31, 2013
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Dec. 31, 2014
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| Capital |
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| Preferred stock, liquidation value (in dollars per share) |
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|
1,000.00 |
$ 1,000.00 |
| Number of shares of common stock that can be purchased by exercise of warrants |
1,147,666 |
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| Percentage reduction in the number of shares of common stock that can be purchased by exercise of warrants |
50.00% |
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| Number of shares of common stock that can be purchased by exercise of warrants, after reduction |
573,833 |
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| Warrants outstanding (in shares) |
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573,833 |
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| Preferred stock, shares outstanding |
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|
72,664 |
72,664 |
| Series C Preferred stock |
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| Capital |
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| Shares issued |
72,664 |
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| Preferred stock, liquidation value (in dollars per share) |
1,000 |
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| Aggregate proceeds from issuance of shares |
72,664,000 |
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| Series C Preferred stock | Initial dividend period |
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| Capital |
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| Dividend rate (as a percent) |
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5.00% |
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| Series C Preferred stock | Period from the 2nd through the 10th calendar quarters |
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| Capital |
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| Dividend rate (as a percent) |
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5.00% |
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| Series C Preferred stock | Period from the 11th calendar quarter through 4.5 years after issuance | Minimum |
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| Capital |
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| Dividend rate (as a percent) |
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1.00% |
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| Series C Preferred stock | Period from the 11th calendar quarter through 4.5 years after issuance | Maximum |
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| Capital |
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| Dividend rate (as a percent) |
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7.00% |
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| Series C Preferred stock | Period after 4.5 years from issuance |
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| Capital |
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| Dividend rate (as a percent) |
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|
9.00% |
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| Series T Preferred stock |
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| Capital |
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| Shares redeemed |
100,000 |
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| Redemption price |
100,100,000 |
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