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Investment Securities Available for Sale (Summary of Sales Transactions in the Investment Securities Available for Sale Portfolio) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Investments [Abstract] |  |  |  |
Proceeds from sales of investment securities available for sale | $ 2,269,682 | $ 104,434 | $ 2,682,861 | $ 1,746,673
Gross realized gains on sales | 75,105 | 0 | 83,839 | 9,129
Gross realized losses on sales | (5,696) | (1,845) | (5,695) | (10,900)
Investment securities gains, net | $ 69,409 | $ (1,845) | $ 78,144 | $ (1,771)

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