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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 25, 2022
Jun. 30, 2021
Cover [Abstract]      
Entity Registrant Name QNB Corp.    
Trading Symbol QNBC    
Security Exchange Name NONE    
Entity Interactive Data Current Yes    
Title of 12(g) Security Common Stock    
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    
Document Annual Report true    
Document Transition Report false    
Entity Emerging Growth Company false    
Entity Small Business true    
Document Type 10-K    
Current Fiscal Year End Date --12-31    
Entity Common Stock, Shares Outstanding   3,551,629  
Entity Public Float     $ 115,132,528
Amendment Flag false    
Entity Central Index Key 0000750558    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Well-known Seasoned Issuer No    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Shell Company false    
ICFR Auditor Attestation Flag false    
Auditor Firm ID 23    
Auditor Name Baker Tilly US, LLP    
Auditor Location Iselin, New Jersey    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of registrant’s Proxy Statement for the annual meeting of its shareholders to be held May 24, 2022 are incorporated by reference in Part III of this report.