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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Mar. 25, 2022
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment charges | $ 0 |  |
Core deposit intangibles |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Core deposit intangibles balance | 6,432,000 | $ 10,552,000 |
Valley Republic Bancorp |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Additions to core deposit intangibles |  |  | $ 10,600,000
FNBB |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Additions to core deposit intangibles | $ 27,600,000 |  |

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