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Securities - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Proceeds from sales of securities | $ 0 | $ 0 | $ 8,149,000 |
Net losses in earnings resulting from sale of securities |  |  | (1,871,000) |
Net unrealized losses recorded in accumulated other comprehensive income |  |  | $ (1,700,000) |
Unrealized loss on securities |  | 0 |  |
Available for sale securities pledged as collateral | $ 31,500,000 | $ 31,500,000 |  | $ 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% | 10.00% |  |

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