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Securities (Summary Of Other-Than-Temporary Impairment Losses On Securities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Available-for-sale Securities [Abstract]      
Total other-than-temporary impairment losses $ 0 $ (1) $ (155)
Non-credit related other-than-temporary impairment on available for sale debt securities 0 0 37
Net impairment loss recognized in earnings $ 0 $ (1) $ (118)