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Document And Entity Information - shares
 9 Months Ended
Sep. 30, 2015
Oct. 31, 2015
Document and Entity Information [Abstract]    
Entity Registrant Name PATRIOT NATIONAL BANCORP INC  
Trading Symbol pnbk  
Document Type 10-Q  
Current Fiscal Year End Date --12-31  
Entity Common Stock, Shares Outstanding   3,962,170
Amendment Flag false  
Entity Central Index Key 0001098146  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Filer Category Smaller Reporting Company  
Entity Well-known Seasoned Issuer No  
Document Period End Date Sep. 30, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q3