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Document and Entity Information
May 26, 2020
Cover [Abstract]  
Entity Registrant Name S&T BANCORP INC
Amendment Flag false
Entity Central Index Key 0000719220
Document Type 8-K
Document Period End Date May 26, 2020
Entity Incorporation State Country Code PA
Entity File Number 0-12508
Entity Tax Identification Number 25-1434426
Entity Address, Address Line One 800 Philadelphia Street
Entity Address, City or Town Indiana
Entity Address, State or Province PA
Entity Address, Postal Zip Code 15701
City Area Code (800)
Local Phone Number 325-2265
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, $2.50 par value
Trading Symbol STBA
Security Exchange Name NASDAQ
Entity Emerging Growth Company false