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Federal Funds Purchased and Securities Sold Under Agreement to Repurchase - Additional Information (Detail) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Variable Interest Entity [Line Items]    
Federal funds purchased $ 0 $ 0
Securities sold under agreements to repurchase 27,200,000  
Pledged as Collateral    
Variable Interest Entity [Line Items]    
Securities sold under agreements to repurchase $ 43,000,000 $ 42,600,000