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Document And Entity Information - shares
 6 Months Ended
Jun. 30, 2021
Aug. 01, 2021
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Amendment Flag false  
Document Period End Date Jun. 30, 2021  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q2  
Entity Registrant Name AMERISERV FINANCIAL INC /PA/  
Entity File Number 0-11204  
Entity Incorporation, State or Country Code PA  
Entity Tax Identification Number 25-1424278  
Entity Address, Address Line One Main & Franklin Streets  
Entity Address, Address Line Two P.O. Box 430  
Entity Address, City or Town Johnstown  
Entity Address, State or Province PA  
Entity Address, Postal Zip Code 15907-0430  
City Area Code (814)  
Local Phone Number 533-5300  
Entity Central Index Key 0000707605  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Current Reporting Status Yes  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Interactive Data Current Yes  
Entity Common Stock, Shares Outstanding   17,075,000
COMMON STOCK    
Document Information [Line Items]    
Trading Symbol ASRV  
Title of 12(b) Security Common Stock  
Security Exchange Name NASDAQ  
Beneficial Unsecured Securities    
Document Information [Line Items]    
Trading Symbol ASRVP  
Title of 12(b) Security Beneficial Unsecured Securities  
Security Exchange Name NASDAQ