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Investment Securities - Available-for-Sale and Held-to-Maturity Investment Securities with Unrealized Losses by Aggregated Major Security Type and Length of Time in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | $ 654,262 | $ 1,295,822
Available-for-Sale, Less than 12 Months, Unrealized Losses | (4,917) | (11,960)
Available-for-Sale, 12 months or longer, Fair Value | 36,356 | 314,350
Available-for-Sale, 12 months or longer, Unrealized Losses | (6,468) | (9,700)
Available-for-Sale, Fair Value | 690,618 | 1,610,172
Available-for-Sale, Unrealized Losses | (11,385) | (21,660)
U.S. Treasury |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value |  | 999
Available-for-Sale, Less than 12 Months, Unrealized Losses |  | (2)
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 |  | 999
Available-for-Sale, Unrealized Losses | 0 | (2)
U.S. government-sponsored entities and agencies |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 355,528 | 357,647
Available-for-Sale, Less than 12 Months, Unrealized Losses | (3,921) | (4,638)
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 | 355,528 | 357,647
Available-for-Sale, Unrealized Losses | (3,921) | (4,638)
Mortgage-backed securities |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 275,833 | 786,245
Available-for-Sale, Less than 12 Months, Unrealized Losses | (895) | (6,122)
Available-for-Sale, 12 months or longer, Fair Value | 3,572 | 212,056
Available-for-Sale, 12 months or longer, Unrealized Losses | (95) | (2,930)
Available-for-Sale, Fair Value | 279,405 | 998,301
Available-for-Sale, Unrealized Losses | (990) | (9,052)
States and political subdivisions |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 3,497 | 120,166
Available-for-Sale, Less than 12 Months, Unrealized Losses | (31) | (1,016)
Available-for-Sale, 12 months or longer, Fair Value | 0 | 7,006
Available-for-Sale, 12 months or longer, Unrealized Losses | 0 | (31)
Available-for-Sale, Fair Value | 3,497 | 127,172
Available-for-Sale, Unrealized Losses | (31) | (1,047)
Pooled trust preferred securities |  |
Schedule Of Available For Sale And Held To Maturity Securities [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 | 7,913 | 8,222
Available-for-Sale, 12 months or longer, Unrealized Losses | (5,850) | (5,589)
Available-for-Sale, Fair Value | 7,913 | 8,222
Available-for-Sale, Unrealized Losses | (5,850) | (5,589)
Other securities |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 19,404 | 30,765
Available-for-Sale, Less than 12 Months, Unrealized Losses | (70) | (182)
Available-for-Sale, 12 months or longer, Fair Value | 24,871 | 87,066
Available-for-Sale, 12 months or longer, Unrealized Losses | (523) | (1,150)
Available-for-Sale, Fair Value | 44,275 | 117,831
Available-for-Sale, Unrealized Losses | $ (593) | $ (1,332)

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