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Shareholders' Equity - Issued and Outstanding Preferred Stock (Parenthetical) (Detail) (USD $)
1 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Aug. 31, 2012
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Ten Year Warrant Series A Preferred [Member]
Jun. 30, 2013
Series A [Member]
Jun. 30, 2013
Ten Year Warrant Series C Preferred [Member]
Jun. 30, 2013
Series C [Member]
Jun. 30, 2013
Preferred series A and C First Five Years [Member]
Jun. 30, 2013
Preferred Series A and C After Five Years [Member]
Mar. 31, 2013
Series C Warrants [Member]
Jun. 30, 2013
Series D [Member]
Jun. 30, 2013
Series A Fixed Rate Cumulative Perpetual Preferred Stock [Member]
Dec. 31, 2012
Series A Fixed Rate Cumulative Perpetual Preferred Stock [Member]
Jun. 30, 2013
Series C Fixed Rate Cumulative Perpetual Preferred Stock [Member]
Dec. 31, 2012
Series C Fixed Rate Cumulative Perpetual Preferred Stock [Member]
Jun. 30, 2013
Series D Fixed Rate Non-Cumulative Perpetual Preferred Stock [Member]
Dec. 31, 2012
Series D Fixed Rate Non-Cumulative Perpetual Preferred Stock [Member]
Class of Stock [Line Items]                                  
Liquidation preference                       $ 1,000 $ 1,000 $ 1,000 $ 1,000 $ 1,000 $ 1,000
Ten-year warrant to purchase common stock       1,218,522   407,542                      
Exercise price of each class of warrants or rights outstanding     26.50   73.86   55.76                    
Preferred stock dividend rate               5.00% 6.375%   6.875%            
Date of change in the dividend rate Nov. 14, 2013                                
Preferred shares redemption date Nov. 15, 2018                                
Issuance of common shares   129,416,718 128,176,912             186,589              
Redemption days of shares by Company   90 days