Cover Page - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Mar. 29, 2023	Jun. 30, 2022
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Current Fiscal Year End Date	--12-31
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, 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			$ 46.0
Entity Common Stock, Shares Outstanding		3,965,186
Entity Central Index Key	0001098146
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false