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Investment Securities - Available-for-Sale Investment Securities with Unrealized Losses by Aggregated Major Security Type and Length of Time in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | $ 2,651,373 | $ 654,262
Available-for-Sale, Less than 12 Months, Unrealized Losses | (76,370) | (4,917)
Available-for-Sale, 12 months or longer, Fair Value | 46,786 | 36,356
Available-for-Sale, 12 months or longer, Unrealized Losses | (6,052) | (6,468)
Available-for-Sale, Fair Value | 2,698,159 | 690,618
Available-for-Sale, Unrealized Losses | (82,422) | (11,385)
U.S. Treasury |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 131,593 |
Available-for-Sale, Less than 12 Months, Unrealized Losses | (8,337) |
Available-for-Sale, 12 months or longer, Fair Value | 0 |
Available-for-Sale, 12 months or longer, Unrealized Losses | 0 |
Available-for-Sale, Fair Value | 131,593 |
Available-for-Sale, Unrealized Losses | (8,337) | 0
U.S. government-sponsored entities and agencies |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 1,086,560 | 355,528
Available-for-Sale, Less than 12 Months, Unrealized Losses | (42,518) | (3,921)
Available-for-Sale, 12 months or longer, Fair Value | 0 | 0
Available-for-Sale, 12 months or longer, Unrealized Losses | 0 | 0
Available-for-Sale, Fair Value | 1,086,560 | 355,528
Available-for-Sale, Unrealized Losses | (42,518) | (3,921)
Mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 1,203,839 | 275,833
Available-for-Sale, Less than 12 Months, Unrealized Losses | (20,331) | (895)
Available-for-Sale, 12 months or longer, Fair Value | 3,918 | 3,572
Available-for-Sale, 12 months or longer, Unrealized Losses | (88) | (95)
Available-for-Sale, Fair Value | 1,207,757 | 279,405
Available-for-Sale, Unrealized Losses | (20,419) | (990)
States and political subdivisions |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 186,505 | 3,497
Available-for-Sale, Less than 12 Months, Unrealized Losses | (4,293) | (31)
Available-for-Sale, 12 months or longer, Fair Value | 0 | 0
Available-for-Sale, 12 months or longer, Unrealized Losses | 0 | 0
Available-for-Sale, Fair Value | 186,505 | 3,497
Available-for-Sale, Unrealized Losses | (4,293) | (31)
Pooled trust preferred securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 0 | 0
Available-for-Sale, Less than 12 Months, Unrealized Losses | 0 | 0
Available-for-Sale, 12 months or longer, Fair Value | 8,210 | 7,913
Available-for-Sale, 12 months or longer, Unrealized Losses | (5,543) | (5,850)
Available-for-Sale, Fair Value | 8,210 | 7,913
Available-for-Sale, Unrealized Losses | (5,543) | (5,850)
Other securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 42,876 | 19,404
Available-for-Sale, Less than 12 Months, Unrealized Losses | (891) | (70)
Available-for-Sale, 12 months or longer, Fair Value | 34,658 | 24,871
Available-for-Sale, 12 months or longer, Unrealized Losses | (421) | (523)
Available-for-Sale, Fair Value | 77,534 | 44,275
Available-for-Sale, Unrealized Losses | $ (1,312) | $ (593)

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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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