Fair Value Measurements (Schedule Of Reconciliation Of Investment Securities Available For Sale Measured At Fair Value On A Recurring Basis Level 3 Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Fair Value Measurements [Abstract]
Beginning balance	$ 2,385	$ 1,982
Impairment losses on investment securities
Included in other comprehensive income	56	191
Dispositions
Transfers into Level 3
Ending Balance	$ 2,441	$ 2,173