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	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Securities Available For Sale [Abstract]
Estimated credit losses as of prior year-end,	$ 3,180	$ 3,413
Additions for credit losses for securities on which OTTI has been previously recognized
Additions for credit losses for securities on which OTTI has not been previously recognized
Reductions for securities paid off during the period	$ 387
Estimated credit losses as of December 31,	$ 2,793	$ 3,413