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Securities - Schedule of Amortized Cost, Fair Value and Gross Unrealized Gains and Losses for Securities Held to Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Schedule Of Held To Maturity Securities [Line Items] |  |
Amortized Cost | $ 5,837,706 | $ 1,480,416
Gross Unrealized Gains | 285 | 3,360
Gross Unrealized Losses | (758,185) | (41,385)
Held to Maturity, Fair value | 5,079,806 | 1,442,391
Allowance for Credit Losses | (2,519) | (1,940)
Net Carrying Amount | 5,835,187 | 1,478,476
U.S. Agencies [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Amortized Cost | 123,062 |
Gross Unrealized Losses | (4,139) |
Held to Maturity, Fair value | 118,923 |
Net Carrying Amount | 123,062 |
Mortgage-backed [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Amortized Cost | 3,016,432 | 396,134
Gross Unrealized Gains |  | 14
Gross Unrealized Losses | (380,177) | (2,431)
Held to Maturity, Fair value | 2,636,255 | 393,717
Net Carrying Amount | 3,016,432 | 396,134
State and political subdivisions [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Amortized Cost | 2,698,212 | 1,084,282
Gross Unrealized Gains | 285 | 3,346
Gross Unrealized Losses | (373,869) | (38,954)
Held to Maturity, Fair value | 2,324,628 | 1,048,674
Allowance for Credit Losses | (2,519) | (1,940)
Net Carrying Amount | $ 2,695,693 | $ 1,082,342

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