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Preferred Stock, Common Stock and Dividends (Details) (USD $)
 0 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 15, 2012
Oct. 31, 2012
May 31, 2012
Apr. 30, 2012
Mar. 31, 2012
Feb. 29, 2012
Oct. 31, 2011
Apr. 30, 2011
Apr. 30, 2009
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Nov. 15, 2012
Nov. 01, 2012
Jul. 11, 2012
Dec. 31, 2011
Dec. 23, 2008
Preferred Stock, Common Stock and Dividends                                    
Series A cumulative perpetual preferred shares, outstanding                   176,000   176,000            
Series A cumulative perpetual preferred shares, issued                   176,000   176,000       216,000 216,000  
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                   $ 131,000,000   $ 131,000,000            
Repurchased shares from U.S. Treasury                   28,501,180   28,501,180     45,000 40,000 28,441,714  
Payment to U.S. Treasury for repurchased shares                   257,885,000   257,885,000     45,000,000 40,000,000 256,793,000  
Series A cumulative perpetual preferred shares, value                   173,179,000   173,179,000       216,000,000 210,548,000  
Accrued dividend on Senior Preferred Stock                             475,000 311,111    
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            
Percentage of aggregate common stock investment on exercise of warrant to Senior Preferred Stock investment                       15.00%            
Warrants, term                       10 years            
Senior preferred stock, dividend paid 2,200,000   2,700,000     2,700,000                        
Senior preferred stock, future payment                           1,637,500        
Series A cumulative perpetual preferred shares, fair value as if issued on a stand-alone basis                   130,900,000   130,900,000            
Warrants, fair value as if issued on a stand-alone basis                   8,000,000   8,000,000            
Series A Cumulative perpetual preferred shares, discount (in dollars)                   2,821,000   2,821,000         5,452,000 12,400,000
Period of amortization of discount on preferred shares                       5 years            
Amortization of discount on series A cumulative perpetual preferred shares                   1,333,000 624,000 2,632,000 1,844,000          
Cash dividends paid to common shareholders (in dollars per share)   $ 0.20   $ 0.20     $ 0.19 $ 0.19                    
Repurchase of common stock, authorized amount         40,000,000       40,000,000                  
Period of repurchase of common stock       12 months         12 months                  
Cumulative number of shares repurchased under all stock repurchase programs   7,807,293                                
Cumulative cost of shares repurchased under all stock repurchase programs   $ 236,912,000