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Pension Benefits - Additional information (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |
Minimum number of annual hours | 1,000 | 1,000
Maximum percent of plan assets comprised of AmeriServ Financial, Inc. common stock | 10.00% | 10.00%
Defined Benefit Pension Items |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Settlement charge | $ 269,000 | $ 1,120,000
Employer contributions |  | 8,000,000.0
Defined Benefit Pension Items | Other assets. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Assets for pension benefits | $ 17,200,000 | $ 17,200,000

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