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Securities - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |
Proceeds from sales of securities | $ 0 | $ 8,149,000 | $ 0
Net gains (loss) in earnings resulting from sale of securities |  | (1,871,000) |
Net unrealized gains (losses) recorded in comprehensive income |  | (1,700,000) |
Available for sale securities pledged as collateral | $ 29,400,000 | $ 24,800,000 |
Minimum | U.S. Government and its Agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Holdings of securities as percentage of share holders' equity | 10.00% |  |

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