Shareholders' Equity And Earnings Per Share (Components Of Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Shareholders' Equity And Earnings Per Share [Abstract]
Accumulated Unrealized Gains (Losses) on Securities, Beginning Balance	$ 4,204	$ 2,679
Total Accumulated Other Comprehensive Income (Loss), Beginning of period	(2,878)	(5,512)
Accumulated Unrealized Gains (Losses) on Derivative Instruments, Beginning Balance	(7,082)	(8,191)
Accumulated Unrealized Gains (Losses) on Securities, Ending Balance	1,772	3,428
Total Accumulated Other Comprehensive Income (Loss), End of period	(4,830)	(3,459)
Other comprehensive income during the period, Accumulated Unrealized Gains (Losses) on Securities	(2,432)	749
Other comprehensive income during the period, Accumulated Unrealized Gains (Losses) on Derivative Instruments	480	1,304
Other comprehensive income during the period, Total Accumulated Other Comprehensive Income (Loss)	(1,952)	2,053
Accumulated Unrealized Gains (Losses) on Derivative Instruments, Ending Balance	$ (6,602)	$ (6,887)