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Earnings (Loss) Per Common Share (Details) (Textuals) (USD $)
In Millions, except Per Share data
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2011
Mar. 31, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Convertible Preferred Securities [Member]
Jun. 30, 2010
Convertible Preferred Securities [Member]
Jun. 30, 2011
Convertible Preferred Securities [Member]
Jun. 30, 2010
Convertible Preferred Securities [Member]
Jun. 30, 2010
Warrants [Member]
Jun. 30, 2010
Stock Compensation Plan [Member]
Jun. 30, 2011
Warrants Issued to the US Treasury [Member]
Mar. 31, 2011
Warrants Issued to the US Treasury [Member]
Dec. 31, 2010
Warrants Issued to the US Treasury [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                            
Weighted average common shares outstanding and dilutive potential common shares in absence of loss 503.1   501.0 484.9 466.5 20.7 20.8 20.7 12.1 34.4 1.2      
Dividends declared $ 0.10 $ 0.10 $ 0.05 $ 0.20 $ 0.10                  
Class of Warrant or Right [Line Items]                            
Warrants exercise price                       $ 9.754 $ 9.773 $ 9.790