    <SEC-DOCUMENT>0000719220-19-000006-index.html : 20190130
    <SEC-HEADER>0000719220-19-000006.hdr.sgml : 20190130
    <ACCEPTANCE-DATETIME>20190130171658
    ACCESSION NUMBER:		0000719220-19-000006
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		19
    CONFORMED PERIOD OF REPORT:	20190130
    ITEM INFORMATION:		Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers
    ITEM INFORMATION:		Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20190130
    DATE AS OF CHANGE:		20190130

    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:		19552839

    	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>a2019_form8-k12819.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: a2019_form8-k12819.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-3.1
    <SEQUENCE>2
    <FILENAME>a2018bylawsamended.htm
    <DESCRIPTION>EXHIBIT 3.1
    <TEXT>
    Document 2 - file: a2018bylawsamended.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>a2018bylawsamended001.jpg
    <TEXT>
    Document 3 - file: a2018bylawsamended001.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>a2018bylawsamended002.jpg
    <TEXT>
    Document 4 - file: a2018bylawsamended002.jpg

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    <SEQUENCE>5
    <FILENAME>a2018bylawsamended003.jpg
    <TEXT>
    Document 5 - file: a2018bylawsamended003.jpg

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    <SEQUENCE>6
    <FILENAME>a2018bylawsamended004.jpg
    <TEXT>
    Document 6 - file: a2018bylawsamended004.jpg

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    <SEQUENCE>7
    <FILENAME>a2018bylawsamended005.jpg
    <TEXT>
    Document 7 - file: a2018bylawsamended005.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>a2018bylawsamended006.jpg
    <TEXT>
    Document 8 - file: a2018bylawsamended006.jpg

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    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>a2018bylawsamended007.jpg
    <TEXT>
    Document 9 - file: a2018bylawsamended007.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>a2018bylawsamended008.jpg
    <TEXT>
    Document 10 - file: a2018bylawsamended008.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>a2018bylawsamended009.jpg
    <TEXT>
    Document 11 - file: a2018bylawsamended009.jpg

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    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>a2018bylawsamended010.jpg
    <TEXT>
    Document 12 - file: a2018bylawsamended010.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>a2018bylawsamended011.jpg
    <TEXT>
    Document 13 - file: a2018bylawsamended011.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>a2018bylawsamended012.jpg
    <TEXT>
    Document 14 - file: a2018bylawsamended012.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>a2018bylawsamended013.jpg
    <TEXT>
    Document 15 - file: a2018bylawsamended013.jpg

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    <SEQUENCE>16
    <FILENAME>a2018bylawsamended014.jpg
    <TEXT>
    Document 16 - file: a2018bylawsamended014.jpg

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    <DOCUMENT>
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    <SEQUENCE>17
    <FILENAME>a2018bylawsamended015.jpg
    <TEXT>
    Document 17 - file: a2018bylawsamended015.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>a2018bylawsamended016.jpg
    <TEXT>
    Document 18 - file: a2018bylawsamended016.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>a2018bylawsamended017.jpg
    <TEXT>
    Document 19 - file: a2018bylawsamended017.jpg

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