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Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2019
Mar. 03, 2020
Jun. 30, 2019
Cover page.      
Document Transition Report false    
Document Annual Report true    
Title of 12(b) Security Common Stock, no par value    
Security Exchange Name NASDAQ    
Entity Address, Address Line One 1 South Second Street    
Entity Address, Address Line Two P.O. Box 42    
Entity Address, City or Town Clearfield    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 16830    
City Area Code 814    
Local Phone Number 765-9621    
Entity Incorporation, State or Country Code PA    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Entity File Number 000-13396    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Trading Symbol CCNE    
Entity Registrant Name CNB FINANCIAL CORP/PA    
Entity Central Index Key 0000736772    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding (in shares)   15,397,117  
Entity Public Float     $ 406,700,054
Entity Tax Identification Number 25-1450605    
Documents Incorporated by Reference
Portions of the definitive Proxy Statement for the 2020 Annual Meeting of Stockholders to be held on April 21, 2020 are incorporated by reference into Part III of this report.