Document and Entity Information
Mar. 04, 2022
Document And Entity Information [Line Items]  
Entity Registrant Name CNB FINANCIAL CORP/PA
Amendment Flag false
Entity Central Index Key 0000736772
Document Type 8-K
Document Period End Date Mar. 04, 2022
Entity Incorporation State Country Code PA
Entity File Number 001-39472
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
Entity Emerging Growth Company false
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common Stock, no par value
Trading Symbol CCNE
Security Exchange Name NASDAQ
Series A Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 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