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Document and Entity Information
Nov. 20, 2019
Cover [Abstract]  
Amendment Flag true
Amendment Description Amendment 1
Entity Central Index Key 0000736772
Document Type 8-K/A
Document Period End Date Nov. 20, 2019
Entity Registrant Name CNB FINANCIAL CORP/PA
Entity Incorporation, State or Country Code PA
Entity File Number 000-13396
Entity Tax Identification Number 25-1450605
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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, no par value
Trading Symbol CCNE
Security Exchange Name NASDAQ
Entity Emerging Growth Company false