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Pension Benefits - Additional information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) Y	Jun. 30, 2024 USD ($)	Dec. 31, 2024 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	4.00%		4.00%
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Settlement charge	$ 0	$ 376,000	$ 0	$ 376,000
Pension Plan | Other assets
Defined Benefit Plan Disclosure [Line Items]
Assets for pension benefits	$ 32,400,000		$ 32,400,000		$ 31,400,000

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