Participation In The U.S. Treasury Capital Purchase Program (CPP) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Dec. 23, 2008
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	$ 2.9
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]
Preferred stock, dividend rate, percentage		9.00%
Cumulative Dividends Rate [Member]
Preferred stock, dividend rate, percentage		5.00%