    <SEC-DOCUMENT>0000719220-17-000007-index.html : 20170126
    <SEC-HEADER>0000719220-17-000007.hdr.sgml : 20170126
    <ACCEPTANCE-DATETIME>20170126120831
    ACCESSION NUMBER:		0000719220-17-000007
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		6
    CONFORMED PERIOD OF REPORT:	20170123
    ITEM INFORMATION:		Results of Operations and Financial Condition
    ITEM INFORMATION:		Other Events
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20170126
    DATE AS OF CHANGE:		20170126

    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:		17548758

    	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>stba-20161231x8k.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: stba-20161231x8k.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>stba-20161231xex991.htm
    <DESCRIPTION>EXHIBIT 99.1
    <TEXT>
    Document 2 - file: stba-20161231xex991.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.2
    <SEQUENCE>3
    <FILENAME>stba20161231earningsvisu.htm
    <DESCRIPTION>EXHIBIT 99.2
    <TEXT>
    Document 3 - file: stba20161231earningsvisu.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.3
    <SEQUENCE>4
    <FILENAME>stba-20161231divxex992.htm
    <DESCRIPTION>EXHIBIT 99.3
    <TEXT>
    Document 4 - file: stba-20161231divxex992.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>secondquarter2016earn_image.jpg
    <TEXT>
    Document 5 - file: secondquarter2016earn_image.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>stba20161231earningsvisu001.jpg
    <TEXT>
    Document 6 - file: stba20161231earningsvisu001.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>