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Securities Available For Sale (Summary Of Realized Gains And Losses And Other-Than-Temporary Impairment Losses On Securities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Securities Available For Sale [Abstract]      
Proceeds from Sale of Securities Available for Sale $ 66,583 $ 22,753 $ 37,278
Realized Gains 4,498 1,334 809
Realized Losses     406
Net $ 4,498 $ 1,334 $ 403