Securities Available For Sale (Schedule Of OTTI Related To Historical Estimated Credit Losses On Debt Securities And Changes In Estimated Credit Losses Recognized In Pre-Tax Earnings) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Securities Available For Sale [Abstract]
Estimated credit losses as of beginning of period	$ 4,440	$ 5,041	$ 5,131	$ 4,697
Additions for credit losses for securities on which OTTI has been previously recognized	115	336	115	622
Additions for credit losses for securities on which OTTI has not been previously recognized				58
Reductions for securities paid off during the period		419	691	419
Estimated credit losses as of ending of period	$ 4,555	$ 4,958	$ 4,555	$ 4,958