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Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | $ 648,067 | $ 618,272
Equity securities | 2,421 | 2,169
Swap asset | 6,330 |
(Level 2) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 648,067 | 618,272
Equity securities | 2,421 | 2,169
(Level 2) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] | Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Swap asset | 5,308 | 12,481
Swap liability | 11,638 | 12,481
(Level 2) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] | U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 97,387 | 67,658
(Level 2) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] | Obligations of States and Political Subdivisions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 325,119 | 338,599
(Level 2) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] | Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 225,561 | 212,015
(Level 3) [Member] | Assets Measured at Fair Value on a Nonrecurring Basis [Member] | Collateral-Dependent Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ 19,177 | $ 5,083

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