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Off Balance Sheet Activities - Outstanding Financial Instruments Whose Contract Amounts Represent Credit Risk (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Standby letters of credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Concentration of Risk $ 184 $ 825
Commitments to extend credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Concentration of Risk $ 594,419 $ 640,023