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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Debt Securities, Available-for-sale [Line Items]        
Proceeds from Sale of Available-for-sale Securities     $ 574,374 $ 368,939
Proceeds from Sale of Equity Securities     2 3,459
Proceeds From Sale Of Other Securities     0 7,243
Total proceeds [1]     574,376 379,641
Investment securities gains (losses), net $ 16,155 $ 4,909 (1,275) [1] 3,874 [1]
Available-for-sale Securities [Member]        
Debt Securities, Available-for-sale [Line Items]        
Available-for-sale Securities, Gains realized on sales     16,965 2,287
Available-for-sale Securities, Losses realized on sales     0 (1,559)
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net     0 (133)
Equity Securities [Member]        
Debt Securities, Available-for-sale [Line Items]        
Gain realized on sales     2 2,865
Equity Securities, FV-NI, Unrealized Gain (Loss)     (126) 318
Other Investments [Member]        
Debt Securities, Available-for-sale [Line Items]        
Other Securities Gain On Sale     0 1,094
Fair value adjustments, net     $ (18,116) $ (998)
[1] Available for sale debt securities, equity securities, and other securities.