Shareholders' Equity (Details) (USD $)	0 Months Ended	6 Months Ended	12 Months Ended
	May 27, 2009	Jun. 30, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Jun. 30, 2011	Apr. 22, 2009	Jan. 09, 2009
Shareholders' Equity [Abstract]
Value of Non-Voting Preferred Shares Sold to TARP								$ 125,000,000
Proceeds from Sale of Non-Voting Preferred Share Sold to TARP								125,000,000
Number of Cumulative Perpetual Preferred Shares sold								125,000,000
Preferred Stock, Par or Stated Value Per Share								$ 1,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights								952,260
Class of Warrant or Right, Exercise Price of Warrants or Rights								$ 19.69
Repurchase of Perpetual Preferred Stock							125,000
Repurchase Amount of Perpetual Preferred Stock							126,200,000
Payments for Repurchase of Warrants	5,000,000		0	0	5,025,000
Shares Sold Under Distribution Agency Agreement				3,900,000	4,300,000
Distribution Agency Agreement Average Value Share Price				$ 20.91	$ 18.98
Stock Issued During Period, Shares, New Issues		17,600,160	0	21,487,860	3,267,751
Sale of Stock, Price Per Share						$ 19.00
Proceeds form Public Offering		$ 320,100,000