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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Mar. 23, 2022
Jun. 30, 2021
Document Information [Line Items]      
Entity Central Index Key 0001098146    
Entity Registrant Name PATRIOT NATIONAL BANCORP INC    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Document Transition Report false    
Entity File Number 000-29599    
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, par value $0.01 per share    
Trading Symbol PNBK    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 34,500,000
Entity Common Stock, Shares Outstanding   3,956,492  
Auditor Name RSM US LLP    
Auditor Location Hartford, Connecticut    
Auditor Firm ID 49