Consolidated Statements Of Shareholders' Equity (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Series 2009 Preferred Stock And Related Surplus [Member]
Preferred stock, dividend per share	$ 20.00	$ 20.00
Series 2011 Preferred Stock And Related Surplus [Member]
Preferred stock, dividend per share	$ 10.00	$ 10.00