Fair Values (Schedule Of Changes In Level 3 Assets On Nonrecurring Basis) (Details) (Significant Unobservable Inputs (Level 3) [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Fair Values [Line Items]
Balance, January 1	$ 100,867	$ 90,161
Transfers into Level 3	(4,084)	11,446
Included in earnings	(2,517)	(1,916)
Sales and other reductions	(5,339)	(2,655)
Balance, June 30	88,927	97,036
Other Real Estate Owned [Member]
Fair Values [Line Items]
Balance, January 1	15,092	12,346
Transfers into Level 3	4,361	3,362
Included in earnings	(2,517)	(1,916)
Sales and other reductions	(5,339)	(2,655)
Balance, June 30	11,597	11,137
Impaired Loans [Member]
Fair Values [Line Items]
Balance, January 1	85,775	77,815
Transfers into Level 3	(8,445)	8,084
Balance, June 30	$ 77,330	$ 85,899