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Investment Securities - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 USD ($) Securities | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) Securities | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($)
Marketable Securities [Line Items] |  |  |  |  |
Number of securities less than 12 months | Securities | 47 |  | 47 |  |
Number of securities more than 12 months | Securities | 157 |  | 157 |  |
Unrealized losses securities more than 12 months | $ 15,594 |  | $ 15,594 |  | $ 6,370
Other than temporary impairment charges | 0 | $ 0 | 0 | $ 0 |
Sales of available-for-sale securities |  |  |  | 3,000 |
Proceeds from maturities of securities available-for-sale | 241 |  | 1,071 | 3,659 |
Gain on sale of available for sale debt securities |  |  |  | $ 2 |
Securities pledged as collateral | $ 0 |  | $ 0 |  | 0
Number of investment securities | Securities | 222 |  | 222 |  |
Loss on sale of available for sale securities | $ 6 |  | $ 6 |  |
Municpal Securities [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Number of securities more than 12 months | Securities | 96 |  | 96 |  |
Unrealized losses securities more than 12 months | $ 28,400 |  | $ 28,400 |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 6,000 |  | $ 6,000 |  |
Mortgage-backed securities [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Number of securities more than 12 months | Securities | 57 |  | 57 |  |
Unrealized losses securities more than 12 months | $ 30,400 |  | $ 30,400 |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 7,700 |  | 7,700 |  |
Obligations of state and political subdivisions [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Unrealized losses securities more than 12 months | 5,963 |  | 5,963 |  | $ 371
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 0 |  | $ 0 |  |
Agency Securities [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Number of securities more than 12 months | Securities | 4 |  | 4 |  |
Unrealized losses securities more than 12 months | $ 4,900 |  | $ 4,900 |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 1,400 |  | $ 1,400 |  |

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