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Document And Entity Information (USD $)
 12 Months Ended
Dec. 31, 2011
Jan. 31, 2012
Jun. 30, 2011
Document And Entity Information [Abstract]      
Trading Symbol asrv    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2011    
Entity Central Index Key 0000707605    
Document Fiscal Year Focus 2011    
Document Fiscal Period Focus FY    
Entity Registrant Name AMERISERV FINANCIAL INC /PA/    
Current Fiscal Year End Date --12-31    
Entity Filer Category Smaller Reporting Company    
Entity Common Stock, Shares Outstanding   20,921,021  
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Public Float     $ 41,356,421