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Cover Page
 12 Months Ended
Dec. 31, 2024
Document Information [Line Items]  
Document Type S-4
Amendment Flag false
Entity Registrant Name CNB FINANCIAL CORP/PA
Entity Central Index Key 0000736772
Entity Tax Identification Number 25-1450605
Entity Filer Category Accelerated Filer
Entity Small Business false
Entity Emerging Growth Company false
Entity Incorporation, State or Country Code PA
Entity Primary SIC Number 6021
Entity Address, Address Line One 1 South Second Street
Entity Address, Address Line Two PO 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
Business Contact [Member]  
Document Information [Line Items]  
Contact Personnel Name Michael D. Peduzzi
Entity Address, Address Line One 1 South Second Street
Entity Address, Address Line Two PO 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