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Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2016
Feb. 17, 2017
Jun. 30, 2016
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2016    
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus FY    
Trading Symbol PFBX    
Entity Registrant Name PEOPLES FINANCIAL CORP /MS/    
Entity Central Index Key 0000770460    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Smaller Reporting Company    
Entity Common Stock, Shares Outstanding   5,123,186  
Entity Public Float     $ 47,946,000