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Goodwill and Core Deposits and Other Intangibles - Summary of Changes in Carrying Amount and Accumulated Amortization of Company's Goodwill and Core Deposits and Other Intangibles (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Goodwill |  |  |  |  |
Balance, beginning of period |  |  |  | $ 1,398,253 | $ 1,398,253
Balance, end of period | $ 1,398,253 | $ 1,398,253 |  | 1,398,253 |
Core Deposit Intangibles |  |  |  |  |
Balance, beginning of period |  | 51,023 |  | 48,770 | 58,455
Amortization expense | (2,095) | (2,253) | $ (2,477) | (6,375) | (7,432)
Balance, end of year | $ 42,395 | $ 48,770 | $ 51,023 | $ 42,395 | $ 51,023

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