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Derivative Financial Instruments - Schedule of Notional Amount and Fair Value of Interest Rate Swaps (Detail) - Designated as Hedging Instrument [Member] - Interest Rate Swap [Member] - USD ($)
Sep. 30, 2024
Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Liability Derivatives, Notional Amount $ 100,000,000 $ 100,000,000
Liability Derivatives, Fair Value (2,943,000) (2,679,000)
Loans [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Liability Derivatives, Notional Amount 100,000,000 100,000,000
Liability Derivatives, Fair Value $ (2,943,000) $ (2,679,000)