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Participation In The U.S. Treasury Capital Purchase Program (CPP) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2011
Dec. 23, 2008
Participation In The U.S. Treasury Capital Repurchase Program [Line Items]   
Cumulative perpetual preferred shares issued  100,000,000
Liquidation preference per senior preferred shares  $ 1,000
Charge to retained earnings representing preferred stock dividend and accretion of discount$ 1.5$ 4.4 
Warrant issued to U.S. Treasury relating to CPP 227,376 
Issued warrants as a percentage of senior preferred shares purchased 15.00% 
Warrant issued to U.S. treasury relating to CPP, exercise price $ 65.97 
Trailing average in days 20 
Term of warrants in years 10 
Revised Cumulative Dividends Rate [Member]
   
Participation In The U.S. Treasury Capital Repurchase Program [Line Items]   
Preferred stock, dividend rate, percentage 9.00% 
Cumulative Dividends Rate [Member]
   
Participation In The U.S. Treasury Capital Repurchase Program [Line Items]   
Preferred stock, dividend rate, percentage 5.00%