    <SEC-DOCUMENT>0000719220-19-000046-index.html : 20190605
    <SEC-HEADER>0000719220-19-000046.hdr.sgml : 20190605
    <ACCEPTANCE-DATETIME>20190605172638
    ACCESSION NUMBER:		0000719220-19-000046
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		26
    CONFORMED PERIOD OF REPORT:	20190605
    ITEM INFORMATION:		Entry into a Material Definitive Agreement
    ITEM INFORMATION:		Other Events
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20190605
    DATE AS OF CHANGE:		20190605

    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:		19880768

    	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>
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    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>form8-k_662019.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: form8-k_662019.htm

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    <TYPE>EX-2.1
    <SEQUENCE>2
    <FILENAME>mergeragreement6519.htm
    <DESCRIPTION>EXHIBIT 2.1
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    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>3
    <FILENAME>investpres_legacy.htm
    <DESCRIPTION>EXHIBIT 99.1
    <TEXT>
    Document 3 - file: investpres_legacy.htm

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    <SEQUENCE>4
    <FILENAME>pressrelease6519.htm
    <DESCRIPTION>EXHIBIT 99.2
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    Document 6 - file: investpres_legacy001.jpg

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    Document 8 - file: investpres_legacy003.jpg

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    Document 13 - file: investpres_legacy008.jpg

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    Document 14 - file: investpres_legacy009.jpg

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    Document 15 - file: investpres_legacy010.jpg

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    Document 24 - file: investpres_legacy019.jpg

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    Document 25 - file: investpres_legacy020.jpg

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    <SEQUENCE>26
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    <TEXT>
    Document 26 - file: stbanka01.jpg

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