Derivative Financial Instruments (Rollforward Of Amounts In Accumulated Other Comprehensive Income Related To Interest Rate Swaps Designated As Cash Flow Hedges) (Details) (USD $) In Thousands, unless otherwise specified					3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010	Mar. 31, 2012 Interest Rate Swaps [Member]	Mar. 31, 2011 Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated Unrealized Gains (Losses) on Derivative Instruments, Beginning Balance	$ (6,602)	$ (7,082)	$ (6,887)	$ (8,191)	$ (11,633)	$ (13,323)
Amount reclassified from accumulated other comprehensive income to interest expense on junior subordinated debentures					1,410	2,172
Amount of loss recognized in other comprehensive income					(614)	(51)
Accumulated Unrealized Gains (Losses) on Derivative Instruments, Ending Balance	$ (6,602)	$ (7,082)	$ (6,887)	$ (8,191)	$ (10,837)	$ (11,202)