v3.25.2
Securities - Trading Account Securities, at Estimated Fair Value (Detail) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]    
Trading account securities $ 45,290 $ 33,910
U.S. Treasury [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading account securities 35,515 33,910
States and political subdivisions [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading account securities $ 9,775 $ 0