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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
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Securities Available For Sale [Abstract]        
Estimated credit losses as of June 30 / prior year-end, $ 1,697 $ 3,180 $ 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     1,483 233
Estimated credit losses as of September 30, $ 1,697 $ 3,180 $ 1,697 $ 3,180