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Pension Benefits - Additional information (Details)
 3 Months Ended
Mar. 31, 2025
USD ($)
Y
Dec. 31, 2024
USD ($)
Defined Benefit Plan Disclosure [Line Items]    
Minimum number of annual hours 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%  
Pension Plan | Other assets    
Defined Benefit Plan Disclosure [Line Items]    
Assets for pension benefits $ 31,700,000 $ 31,400,000