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Capital Requirements (Details) (USD $) | 0 Months Ended | 12 Months Ended | 48 Months Ended
--- | --- | --- | ---
Nov. 28, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012
Capital Requirements |  |  |  |  |
Series A cumulative perpetual preferred shares, issued |  | 0 | 216,000 |  | 0
Series A cumulative perpetual preferred shares, par value (in dollars per share) |  | $ 0.01 | $ 0.01 |  | $ 0.01
Series A cumulative perpetual preferred shares, per share liquidation value (in dollars per share) |  | $ 1,000 | $ 1,000 |  | $ 1,000
Series A cumulative perpetual preferred shares, aggregate liquidation value |  | $ 216,000,000 |  |  | $ 216,000,000
Senior preferred stock, dividend rate for first five years (as a percent) |  | 5.00% |  |  |
Senior preferred stock, dividend rate thereafter (as a percent) |  | 9.00% |  |  |
Warrants to purchase entity's common stock (in shares) |  | 1,326,238 |  |  | 1,326,238
Warrants, exercise price (in dollars per share) |  | $ 24.43 |  |  | $ 24.43
Warrants, term |  | 10 years |  |  |
Dividend payable by subsidiaries, maximum |  | 520,000,000 |  |  |
Senior Preferred Stock held by Treasury repurchased (in shares) | 216,000 |  |  |  |
Redemption of senior preferred shares |  | 216,000,000 |  |  |
Preferred stock dividends to the U.S. Treasury |  | $ 10,260,000 | $ 10,800,000 | $ 10,800,000 | $ 41,520,139

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