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Investment Securities (Proceeds From Sales Of Securities And Components Of Investment Securities Gains And Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Investment [Line Items]    
Proceeds from sales of non-marketable securities $ 98 $ 94
Total proceeds [1] 98 94
Investment securities gains (losses), net [1] (772) (995)
Available-for-sale Securities [Member]    
Investment [Line Items]    
Gain realized on donation 2,157 0
Other-than-temporary impairment recognized on debt securities (109) (123)
Non-Marketable [Member]    
Investment [Line Items]    
Gains realized on sales 58 42
Fair value adjustments, net $ (2,878) $ (914)
[1] Available for sale and non-marketable securities