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Pension Benefits - Additional information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) Y	Jun. 30, 2023 USD ($)	Dec. 31, 2023 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	10.00%		10.00%
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Settlement charge	$ 376,000	$ 0	$ 376,000	$ 0
Pension Plan | Other assets
Defined Benefit Plan Disclosure [Line Items]
Assets for pension benefits	$ 27,700,000		$ 27,700,000		$ 24,700,000

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- Definition

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The number of consecutive calendar years highest annual earnings is considered for defined benefit plans.

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

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Defined Benefit Plan, Minimum Number Of Annual Employee Hours.

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Period the individual is required to perform services to be fully vested under the defined benefit plans.

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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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Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

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