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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 | 9 Months Ended
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Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Investments [Abstract] |  |  |  |  |
Proceeds from sales of investment securities available for sale | $ 1,249,507 |  | $ 709,464 | $ 3,932,368 | $ 2,456,137
Gross realized gains on sales | 0 |  | 140 | 83,840 | 9,270
Gross realized losses on sales(1) | (1,550) | $ (5,700) | (3,871) | (7,246) | (14,772)
Investment securities gains (losses), net | $ (1,550) | $ 69,400 | $ (3,731) | $ 76,594 | $ (5,502)

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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
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