Consolidated Statements Of Shareholders' Equity (Parenthetical) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Series 2009 Preferred Stock And Related Surplus [Member]
Preferred stock, dividend per share	$ 40.00
Series 2011 Preferred Stock And Related Surplus [Member]
Preferred stock, dividend per share	$ 40.00	$ 40.00