Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Nov. 01, 2019
Cover [Abstract]
Entity Registrant Name	QNB CORP
Trading Symbol	QNBC
Security Exchange Name	NONE
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		3,507,556
Amendment Flag	false
Entity Central Index Key	0000750558
Entity Filer Category	Accelerated Filer
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Quarterly Report	true
Document Transition Report	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity File Number	0-17706
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	23-2318082
Entity Address, Address Line One	15 North Third Street
Entity Address, Address Line Two	P.O. Box 9005
Entity Address, City or Town	Quakertown
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	18951-9005
City Area Code	215
Local Phone Number	538-5600