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Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2025
Nov. 01, 2025
Document and Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2025  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Transition Report false  
Securities Act File Number 001-36388  
Entity Registrant Name PEOPLES FINANCIAL SERVICES CORP.  
Entity Incorporation, State or Country Code PA  
Entity Tax Identification Number 23-2391852  
Entity Address, Address Line One 30 ED Preate Drive  
Entity Address, City or Town Moosic  
Entity Address, State or Province PA  
Entity Address, Postal Zip Code 18507  
City Area Code 570  
Local Phone Number 346-7741  
Title of 12(b) Security Common stock, $2.00 par value  
Trading Symbol PFIS  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   9,994,595
Entity Central Index Key 0001056943  
Document Fiscal Period Focus Q3  
Amendment Flag false