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Securities - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Proceeds from sales of securities | $ 0 | $ 8,149,000 | $ 0 |
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 |  | 24,700,000 |  | $ 23,400,000
Unrealized losses on securities |  | $ 1,871,000 |  |
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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