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Goodwill and Other Intangibles - Additional Information (Detail) - USD ($) |  |  | 9 Months Ended
--- | --- | --- | ---
Oct. 27, 2016 | Aug. 31, 2014 | Sep. 30, 2024
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment of goodwill and other intangible assets |  |  | $ 0
Goodwill and other intangible assets triggering event |  |  | No triggering event occurred as of, or subsequent to September 30, 2024, that would require a reassessment of goodwill and other intangible assets.
CBI Merger |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 11,000,000.0 |  |
CBI Merger | Core deposit intangible |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets acquired |  | $ 2,200,000 |

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