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Document And Entity Information - shares
 6 Months Ended
Jun. 30, 2018
Aug. 08, 2018
Document Information [Line Items]    
Entity Registrant Name PATRIOT NATIONAL BANCORP INC  
Entity Central Index Key 0001098146  
Trading Symbol pnbk  
Current Fiscal Year End Date --12-31  
Entity Filer Category Smaller Reporting Company  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Well-known Seasoned Issuer No  
Entity Common Stock, Shares Outstanding (in shares)   3,904,578
Document Type 10-Q/A  
Document Period End Date Jun. 30, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q2  
Amendment Flag true  
Amendment Description Patriot National Bancorp, Inc. (the "Company") originally filed its Quarterly Report on Form 10-Q for the quarter ended June 30, 2018 (the "Original Filing") with the Securities and Exchange Commission ("SEC") on August 14, 2018. The Company is filing this Amendment No. 1 to its Quarterly Report on Form 10-Q (the "Form 10-Q/A" and, together with the Original Filing, the "Form 10-Q") solely to correct certain inadvertent errors in the column of Three Months Ended June 30, 2018 in the Consolidated Statements of Comprehensive Income (Loss) (Unaudited) as follows: