    <SEC-DOCUMENT>0001193125-24-082855-index.html : 20240401
    <SEC-HEADER>0001193125-24-082855.hdr.sgml : 20240401
    <ACCEPTANCE-DATETIME>20240401100550
    ACCESSION NUMBER:		0001193125-24-082855
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		47
    CONFORMED PERIOD OF REPORT:	20240514
    FILED AS OF DATE:		20240401
    DATE AS OF CHANGE:		20240401

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			S&T BANCORP INC
    		CENTRAL INDEX KEY:			0000719220
    		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
    		ORGANIZATION NAME:           	02 Finance
    		IRS NUMBER:				251434426
    		STATE OF INCORPORATION:			PA
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-12508
    		FILM NUMBER:		24806173

    	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>DEF 14A
    <SEQUENCE>1
    <FILENAME>d935855ddef14a.htm
    <DESCRIPTION>DEF 14A
    <TEXT>
    Document 1 - file: d935855ddef14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>2
    <FILENAME>stba-20231231.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA
    <TEXT>
    Document 2 - file: stba-20231231.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.DEF
    <SEQUENCE>3
    <FILENAME>stba-20231231_def.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE
    <TEXT>
    Document 3 - file: stba-20231231_def.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>4
    <FILENAME>stba-20231231_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE
    <TEXT>
    Document 4 - file: stba-20231231_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>5
    <FILENAME>stba-20231231_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE
    <TEXT>
    Document 5 - file: stba-20231231_pre.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>g935855arrow.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: g935855arrow.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>g935855g00a84.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: g935855g00a84.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>g935855g00v00.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: g935855g00v00.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>g935855g01r04.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: g935855g01r04.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>g935855g02i77.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: g935855g02i77.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>g935855g06c01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: g935855g06c01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>g935855g06c04.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: g935855g06c04.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>g935855g06d27.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: g935855g06d27.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>g935855g07d24.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: g935855g07d24.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>g935855g07r82.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: g935855g07r82.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>g935855g18a01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: g935855g18a01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>g935855g18a02.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: g935855g18a02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>g935855g19a01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: g935855g19a01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>g935855g19a02.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: g935855g19a02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>g935855g19q13.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 20 - file: g935855g19q13.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>g935855g20a01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 21 - file: g935855g20a01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>22
    <FILENAME>g935855g20a02.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 22 - file: g935855g20a02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>23
    <FILENAME>g935855g20a03.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 23 - file: g935855g20a03.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>24
    <FILENAME>g935855g21a01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 24 - file: g935855g21a01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>25
    <FILENAME>g935855g21a02.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 25 - file: g935855g21a02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>26
    <FILENAME>g935855g22a01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 26 - file: g935855g22a01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>27
    <FILENAME>g935855g25m01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 27 - file: g935855g25m01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>28
    <FILENAME>g935855g26g26.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 28 - file: g935855g26g26.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>29
    <FILENAME>g935855g27g27.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 29 - file: g935855g27g27.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>30
    <FILENAME>g935855g27p04.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 30 - file: g935855g27p04.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>31
    <FILENAME>g935855g28m01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 31 - file: g935855g28m01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>32
    <FILENAME>g935855g62s76.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 32 - file: g935855g62s76.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>33
    <FILENAME>g935855g66y77.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 33 - file: g935855g66y77.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>34
    <FILENAME>g935855g68e33.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 34 - file: g935855g68e33.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>35
    <FILENAME>g935855g69f39.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 35 - file: g935855g69f39.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>36
    <FILENAME>g935855g75h27.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 36 - file: g935855g75h27.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>37
    <FILENAME>g935855g79o12.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 37 - file: g935855g79o12.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>38
    <FILENAME>g935855imgs001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 38 - file: g935855imgs001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>40
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 40 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>41
    <FILENAME>R2.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 41 - file: R2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>42
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 42 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>43
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 43 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>45
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 45 - file: FilingSummary.html

    Document 45 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>47
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 47 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>48
    <FILENAME>0001193125-24-082855-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 48 - file: 0001193125-24-082855-xbrl.zip

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>50
    <FILENAME>d935855ddef14a_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 50 - file: d935855ddef14a_htm.html

    Document 50 - RAW XML: d935855ddef14a_htm.xml

    </DOCUMENT>
    </SEC-DOCUMENT>