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Derivatives - Summary of Gross Notional Amount Derivatives (Detail) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Customers [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 242,672 | $ 247,727
Financial Institutions Asset Position [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 242,672 | $ 247,727

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