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Cover - USD ($)
 12 Months Ended
Dec. 31, 2023
Mar. 06, 2024
Jun. 30, 2023
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-39472    
Entity Registrant Name CNB FINANCIAL CORP/PA    
Entity Incorporation, State or Country Code PA    
Entity Tax Identification Number 25-1450605    
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 Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 349,396,611
Entity Common Stock, Shares Outstanding (in shares)   21,024,812  
Documents Incorporated by Reference
Portions of the definitive Proxy Statement for the 2024 Annual Meeting of Stockholders to be held on April 16, 2024 are incorporated by reference into Part III of this report.
    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000736772    
Common Stock      
Document Information [Line Items]      
Title of 12(b) Security Common Stock, no par value    
Trading Symbol CCNE    
Security Exchange Name NASDAQ    
Series A Preferred Stock      
Document Information [Line Items]      
Title of 12(b) Security Depositary Shares (each representing a 1/40th interest in a share of 7.125% Series A Non-Cumulative, perpetual preferred stock)    
Trading Symbol CCNEP    
Security Exchange Name NASDAQ