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Securities (Year End Trading Account Securities at Estimated Fair Value) (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Trading account securities | $ 33,910 | $ 31,717
US Treasury [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Trading account securities | 33,910 | 30,265
States and Political Subdivisions [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Trading account securities | $ 0 | $ 1,452

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