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Investment Securities (Sales Of Available-For-Sale Securities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investment Securities [Abstract]      
Proceeds $ 21,983 $ 263,994 $ 135,695
Gains 138 300 382
Losses (124) (10,706) (2,249)
Net gain (loss) $ 14 $ (10,406) $ (1,867)