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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