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Derivatives and Hedging Activities - Summary of Balance Sheet Related to Cumulative Basis Adjustment for Fair Value Hedges (Detail) - Loans [Member] - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Derivatives Fair Value [Line Items] |  |
Carrying Amount of Hedged Assets/(Liabilities) | $ 50,080 | $ 24,957
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) | $ 80 | $ (43)

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