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Pension Benefits - Additional information (Details) $ in Millions	Mar. 31, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Minimum number of annual hours	1,000
Maximum percent of plan assets comprised of AmeriServ Financial, Inc. common stock	10.00%
Defined Benefit Pension Items | Other assets.
Defined Benefit Plan Disclosure [Line Items]
Assets for pension benefits	$ 22.4

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Defined Benefit Plan, Maximum Percent Of Assets Comprised Of Entity Common Stock.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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