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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
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Securities Available For Sale [Abstract]      
Estimated credit losses as of prior year-end, $ 3,180 $ 3,413 $ 3,923
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 sold or paid off during the period 1,483 233 510
Estimated credit losses as of December 31, $ 1,697 $ 3,180 $ 3,413