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Debt Securities (Sales of Debt Securities) (Narrative) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Investments Debt And Equity Securities [Abstract] |  |  |  |
Realized gains on sales of debt securities | $ 7,100 | $ 7,100 | $ 25,300 | $ 16,400
Realized losses on sales of debt securities | 200 | 400 | 7,400 | 3,400
Proceeds from sales of debt securities | $ 189,100 | $ 200,100 | $ 869,057 | $ 694,588

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- Definition Amount of realized gain 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/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563 + Details
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