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Securities - Additional Information (Detail) $ in Thousands | Dec. 31, 2024 USD ($) Security | Dec. 31, 2023 USD ($)
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Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |
Carrying value of pledged securities | $ 206,600 | $ 211,616
Available for sale term | 3 years |
Number of securities in portfolio with unrealized losses | Security | 508 |
Estimated fair values of debt securities | $ 574,516 | 447,874
Unrealized losses of debt securities | 62,873 | 57,679
Agencies of U.S. Federal Government [Member] |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |
Estimated fair values of debt securities | 301,883 |
Unrealized losses of debt securities | 35,875 |
State Municipalities [Member] |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |
Estimated fair values of debt securities | 272,633 | 181,459
Unrealized losses of debt securities | $ 26,998 | $ 23,578

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