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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2017
Feb. 28, 2018
Jun. 30, 2017
Document And Entity Information      
Entity Registrant Name PEOPLES FINANCIAL SERVICES CORP.    
Trading Symbol pfis    
Entity Central Index Key 0001056943    
Document Type 10-K    
Document Period End Date Dec. 31, 2017    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 323,434,208
Entity Common Stock, Shares Outstanding   7,396,505  
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY