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Goodwill and Core Deposits and Other Intangibles - Summary of Carrying Amount and Accumulated Amortization of Core Deposits and Other Intangibles (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022
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Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |
Gross carrying basis | $ 128,888 | $ 128,888 |  |
Accumulated amortization | (86,493) | (80,118) |  |
Net carrying amount | $ 42,395 | $ 48,770 | $ 51,023 | $ 58,455

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