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Capital Requirements (Details) (USD $)
 0 Months Ended 12 Months Ended 48 Months Ended
Nov. 28, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Nov. 28, 2012
Capital Requirements          
Series A cumulative perpetual preferred shares, aggregate liquidation value   $ 216,000,000      
Series A cumulative perpetual preferred shares, issued   216,000      
Series A cumulative perpetual preferred shares, par value (in dollars per share)   $ 0.01      
Series A cumulative perpetual preferred shares, per share liquidation value (in dollars per share)   $ 1,000      
Warrants to purchase entity's common stock (in shares)   1,326,238      
Warrants, exercise price (in dollars per share)   $ 24.43      
Warrants, term   10 years      
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%      
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 41,520,139
Dividend payable by subsidiaries, maximum   $ 584,000,000