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Securities - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Proceeds from sales of securities | $ 0 | $ 0 | $ 0 | $ 8,035,000 |
Net gains in earnings resulting from sale of securities |  |  |  | 99,000 |
Net unrealized gains recorded in accumulated other comprehensive income |  |  |  | $ 100,000 |
Available for sale securities pledged as collateral | $ 24,500,000 |  | $ 24,500,000 |  | $ 34,700,000
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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