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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 | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2023
Goodwill |  |  |  |
Balance, beginning of period | $ 1,398,253 | $ 1,398,253 |  | $ 1,398,253
Acquisitions | 0 |  |  | 0
Balance, end of period | 1,398,253 |  | $ 1,398,253 | 1,398,253
Core Deposit Intangibles |  |  |  |
Balance, beginning of period | 48,770 | 58,455 | 55,978 | 58,455
Amortization expense | (2,140) | (2,477) | (7,208) |
Balance, end of year | $ 46,630 | $ 55,978 | $ 48,770 | $ 48,770

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