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Investment Securities - Additional Information (Detail) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) Securities | Dec. 31, 2024 USD ($) | Sep. 30, 2024 USD ($)
Marketable Securities [Line Items] |  |  |
Number of securities less than 12 months | Securities | 24 |  |
Number of securities more than 12 months | Securities | 151 |  |
Unrealized losses securities more than 12 months | $ 8,527,000 | $ 11,719,000 |
Securities pledged as collateral | $ 0 | 0 |
Number of investment securities | Securities | 268 |  |
Accrued interest receivable related to investments | $ 7,600,000 | 6,500,000 |
Investment securities on nonaccrual status | 0 | 0 |
Write-offs of accrued interest receivable | $ 0 | 0 |
Municipal Securities [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Number of securities more than 12 months | Securities | 97 |  |
Unrealized losses securities more than 12 months | $ 31,300,000 |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 2,500,000 |  |
Mortgage-backed securities [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Number of securities more than 12 months | Securities | 49 |  |
Unrealized losses securities more than 12 months | $ 27,600,000 |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5,200,000 |  |
U.S. government agency securities [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Unrealized losses securities more than 12 months | 783,000 | $ 1,077,000 |
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 | 1 |  |
Unrealized losses securities more than 12 months | $ 5,600,000 |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 783,000 |  |
Mortgage-Backed Securities, Issued by Private Enterprises [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Number of securities more than 12 months | Securities | 4 |  |
Unrealized losses securities more than 12 months | $ 79,000 |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 1,000 |  |

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