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Investment Securities (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]          
Gross loss on sale of certain securities $ 0 $ 0 $ (7,300) $ (7,345) $ 0
Marketable Securities [Line Items]          
One-time gain $ (38) $ 0   $ 81,815 $ 0
Class B common stock of Visa Inc.          
Marketable Securities [Line Items]          
One-time gain     $ 81,900