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Pension Benefits - Additional information (Details)	Mar. 31, 2021
Pension Benefits
Minimum number of annual hours	1,000
Maximum percent of plan assets comprised of AmeriServ Financial, Inc. common stock	10.00%

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- Definition

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

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- Definition

Defined Benefit Plan, Minimum Number Of Annual Employee Hours.

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