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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 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 |  |  | 48,770 | 53,500 | 58,455
Amortization expense | (2,140) | $ (2,478) | (4,280) | (4,730) | (4,955)
Balance, end of year | $ 44,490 | $ 53,500 | $ 44,490 | $ 48,770 | $ 53,500

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