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Cover - shares
 9 Months Ended
Sep. 30, 2023
Nov. 14, 2023
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2023  
Document Transition Report false  
Entity File Number 000-29599  
Entity Registrant Name PATRIOT NATIONAL BANCORP INC  
Entity Incorporation, State or Country Code CT  
Entity Tax Identification Number 06-1559137  
Entity Address, Address Line One 900 Bedford Street  
Entity Address, City or Town Stamford  
Entity Address, State or Province CT  
Entity Address, Postal Zip Code 06901  
City Area Code 203  
Local Phone Number 252-5900  
Title of 12(b) Security Common Stock  
Trading Symbol PNBK  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   3,965,186
Document Fiscal Year Focus 2023  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --12-31  
Entity Central Index Key 0001098146  
Amendment Flag false