Fair Value Measurements (Schedule Of Quantitative Inputs And Assumptions For Items Categorized In Level 3 Of The Fair Value Hierarchy) (Detail) (USD $) In Thousands, unless otherwise specified							6 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Jun. 30, 2013 Pooled Trust Preferred Securities [Member] BasisPoint
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 31,572	$ 280,582	$ 116,280	$ 30,976	$ 32,062	$ 32,814	$ 30,215
Discount rate, Range (Weighted Average), minimum							5.91%
Discount rate, Range (Weighted Average), maximum							9.01%
Discount rate, Range (Weighted Average)							8.21%
Credit spread, Range (Weighted Average), minimum (in basis points)							246
Credit spread, Range (Weighted Average), maximum (in basis points)							556
Credit spread, Range (Weighted Average) (in basis points)							476