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Pension Benefits - Additional information (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) Y | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Minimum number of annual hours | 1,000 |  | 1,000 |  |
Requisite service period |  |  | 5 years |  |
Number of consecutive calendar years | Y |  |  | 5 |  |
Period of employment |  |  | 10 years |  |
Maximum percent of plan assets comprised of AmeriServ Financial, Inc. common stock | 4.00% |  | 4.00% |  |
Pension Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement charge | $ 0 | $ 34,000 | $ 0 | $ 410,000 |
Pension Plan | Other assets |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Assets for pension benefits | $ 32,800,000 |  | $ 32,800,000 |  | $ 31,400,000

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