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Goodwill and Other Intangible Assets - Additional Information (Detail) |  | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 18, 2016 USD ($) branch | Sep. 30, 2021 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 25, 2022 USD ($) | Oct. 03, 2014 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Impairment charges |  | $ 0 | $ 0 | $ 0 | $ 0 |  |
Valley Republic Bancorp |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Additions to core deposit intangibles |  |  |  |  |  | $ 10,635,000 |
FNBB |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Additions to core deposit intangibles | $ 2,046,000 |  |  |  |  |  |
Bank of America |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Additions to core deposit intangibles |  |  |  |  |  |  | $ 6,614,000
Number of branches (in branches) | branch | 3 |  |  |  |  |  |

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