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Pension Benefits - Additional information (Details)	3 Months Ended		6 Months Ended
Pension Benefits - Additional information (Details)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jun. 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	$ (851,000)		$ (851,000)
Employer contributions		$ 4,000,000.0
Defined Benefit Pension Items \| Other assets.
Defined Benefit Plan Disclosure [Line Items]
Assets for pension benefits	$ 11,400,000		$ 11,400,000

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

Amount of contribution received by defined benefit plan from employer which increases plan assets.