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Securities - Gross Unrealized Losses and Fair Value of Investment Securities Held to Maturity (Detail) $ in Thousands | Sep. 30, 2022 USD ($) Security | Dec. 31, 2021 USD ($) Security
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Schedule Of Held To Maturity Securities [Line Items] |  |
Less than 12 months, Count | Security | 1,721 | 70
Less than 12 months, Fair Value | $ 4,520,742 | $ 903,040
Less than 12 months,Unrealized Losses | $ (698,535) | $ (14,925)
12 months or more, Count | Security | 52 | 28
12 months or more, Fair Value | $ 414,718 | $ 217,579
12 months or more, Unrealized Losses | $ (59,650) | $ (26,460)
Total Count | Security | 1,773 | 98
Total Fair Value | $ 4,935,460 | $ 1,120,619
Total Unrealized Losses | $ (758,185) | $ (41,385)
U.S. Agencies [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Less than 12 months, Count | Security | 11 |
Less than 12 months, Fair Value | $ 118,923 |
Less than 12 months,Unrealized Losses | $ (4,139) |
Total Count | Security | 11 |
Total Fair Value | $ 118,923 |
Total Unrealized Losses | $ (4,139) |
Mortgage-backed [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Less than 12 months, Count | Security | 261 | 12
Less than 12 months, Fair Value | $ 2,636,255 | $ 317,887
Less than 12 months,Unrealized Losses | $ (380,177) | $ (2,431)
Total Count | Security | 261 | 12
Total Fair Value | $ 2,636,255 | $ 317,887
Total Unrealized Losses | $ (380,177) | $ (2,431)
State and political subdivisions [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Less than 12 months, Count | Security | 1,449 | 58
Less than 12 months, Fair Value | $ 1,765,564 | $ 585,153
Less than 12 months,Unrealized Losses | $ (314,219) | $ (12,494)
12 months or more, Count | Security | 52 | 28
12 months or more, Fair Value | $ 414,718 | $ 217,579
12 months or more, Unrealized Losses | $ (59,650) | $ (26,460)
Total Count | Security | 1,501 | 86
Total Fair Value | $ 2,180,282 | $ 802,732
Total Unrealized Losses | $ (373,869) | $ (38,954)

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