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	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Securities Available For Sale [Abstract]
Estimated credit losses as of prior year end	$ 3,923	$ 4,365	$ 4,697
Additions for credit losses for securities on which OTTI has been previously recognized		249	171
Additions for credit losses for securities on which OTTI has not been previously recognized			682
Reductions for securities paid off during the period	510	691	1,185
Estimated credit losses as of December 31,	$ 3,413	$ 3,923	$ 4,365