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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Investment [Line Items]        
Proceeds from Sale and Maturity of Available-for-sale Securities     $ 367,453 $ 0
Proceeds from sales of non-marketable securities     1,583 7,946
Total proceeds [1]     369,036 7,946
Investment securities gains (losses), net $ (3,037) $ (1,965) (2,158) [1] (3,704) [1]
Available-for-sale Securities [Member]        
Investment [Line Items]        
Loss Realized on Called Bond     (254) 0
Available-for-sale Securities, Gross Realized Gains     592 0
Available-for-sale Securities, Gross Realized Losses     (568) 0
Gain realized on donation     6,707 0
Other-than-temporary impairment recognized on debt securities     (372) (270)
Non-Marketable [Member]        
Investment [Line Items]        
Gains realized on sales     645 3,717
Nonmarketable Securities Loss On Sale     (880) (502)
Fair value adjustments, net     $ (8,028) $ (6,649)
[1] Available for sale and non-marketable securities