    <SEC-DOCUMENT>0000719220-19-000011-index.html : 20190212
    <SEC-HEADER>0000719220-19-000011.hdr.sgml : 20190212
    <ACCEPTANCE-DATETIME>20190212125948
    ACCESSION NUMBER:		0000719220-19-000011
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		25
    CONFORMED PERIOD OF REPORT:	20190212
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20190212
    DATE AS OF CHANGE:		20190212

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			S&T BANCORP INC
    		CENTRAL INDEX KEY:			0000719220
    		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
    		IRS NUMBER:				251434426
    		STATE OF INCORPORATION:			PA
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-12508
    		FILM NUMBER:		19589447

    	BUSINESS ADDRESS:
    		STREET 1:		800 PHILADELPHIA STREET
    		STREET 2:		PO BOX 190
    		CITY:			INDIANA
    		STATE:			PA
    		ZIP:			15701
    		BUSINESS PHONE:		724-427-2347

    	MAIL ADDRESS:
    		STREET 1:		800 PHILADELPHIA STREET
    		STREET 2:		PO BOX 190
    		CITY:			INDIANA
    		STATE:			PA
    		ZIP:			15701
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>form8-k4q18investxpres.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: form8-k4q18investxpres.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>stba4q18investorsheetr20.htm
    <DESCRIPTION>EXHIBIT 99.1
    <TEXT>
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    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.2
    <SEQUENCE>3
    <FILENAME>stba4q18investorpresr207.htm
    <DESCRIPTION>EXHIBIT 99.2
    <TEXT>
    Document 3 - file: stba4q18investorpresr207.htm

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    <SEQUENCE>4
    <FILENAME>stba4q18investorpresr207001.jpg
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    Document 20 - file: stba4q18investorpresr207017.jpg

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    Document 23 - file: stba4q18investorpresr207020.jpg

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    <SEQUENCE>24
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