    <SEC-DOCUMENT>0000719220-23-000013-index.html : 20230213
    <SEC-HEADER>0000719220-23-000013.hdr.sgml : 20230213
    <ACCEPTANCE-DATETIME>20230213160411
    ACCESSION NUMBER:		0000719220-23-000013
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		44
    CONFORMED PERIOD OF REPORT:	20230213
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20230213
    DATE AS OF CHANGE:		20230213

    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:		23618267

    	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-20230213.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: stba-20230213.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>a4q-2022investorpresenta.htm
    <DESCRIPTION>EX-99.1
    <TEXT>
    Document 2 - file: a4q-2022investorpresenta.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>3
    <FILENAME>stba-20230213.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
    <TEXT>
    Document 3 - file: stba-20230213.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>4
    <FILENAME>stba-20230213_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT
    <TEXT>
    Document 4 - file: stba-20230213_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>5
    <FILENAME>stba-20230213_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
    <TEXT>
    Document 5 - file: stba-20230213_pre.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>a4q-2022investorpresenta001.jpg
    <TEXT>
    Document 6 - file: a4q-2022investorpresenta001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>a4q-2022investorpresenta002.jpg
    <TEXT>
    Document 7 - file: a4q-2022investorpresenta002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>a4q-2022investorpresenta003.jpg
    <TEXT>
    Document 8 - file: a4q-2022investorpresenta003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>a4q-2022investorpresenta004.jpg
    <TEXT>
    Document 9 - file: a4q-2022investorpresenta004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>a4q-2022investorpresenta005.jpg
    <TEXT>
    Document 10 - file: a4q-2022investorpresenta005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>a4q-2022investorpresenta006.jpg
    <TEXT>
    Document 11 - file: a4q-2022investorpresenta006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>a4q-2022investorpresenta007.jpg
    <TEXT>
    Document 12 - file: a4q-2022investorpresenta007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>a4q-2022investorpresenta008.jpg
    <TEXT>
    Document 13 - file: a4q-2022investorpresenta008.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>a4q-2022investorpresenta009.jpg
    <TEXT>
    Document 14 - file: a4q-2022investorpresenta009.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>a4q-2022investorpresenta010.jpg
    <TEXT>
    Document 15 - file: a4q-2022investorpresenta010.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>a4q-2022investorpresenta011.jpg
    <TEXT>
    Document 16 - file: a4q-2022investorpresenta011.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>a4q-2022investorpresenta012.jpg
    <TEXT>
    Document 17 - file: a4q-2022investorpresenta012.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>a4q-2022investorpresenta013.jpg
    <TEXT>
    Document 18 - file: a4q-2022investorpresenta013.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>a4q-2022investorpresenta014.jpg
    <TEXT>
    Document 19 - file: a4q-2022investorpresenta014.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>a4q-2022investorpresenta015.jpg
    <TEXT>
    Document 20 - file: a4q-2022investorpresenta015.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>a4q-2022investorpresenta016.jpg
    <TEXT>
    Document 21 - file: a4q-2022investorpresenta016.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>22
    <FILENAME>a4q-2022investorpresenta017.jpg
    <TEXT>
    Document 22 - file: a4q-2022investorpresenta017.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>23
    <FILENAME>a4q-2022investorpresenta018.jpg
    <TEXT>
    Document 23 - file: a4q-2022investorpresenta018.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>24
    <FILENAME>a4q-2022investorpresenta019.jpg
    <TEXT>
    Document 24 - file: a4q-2022investorpresenta019.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>25
    <FILENAME>a4q-2022investorpresenta020.jpg
    <TEXT>
    Document 25 - file: a4q-2022investorpresenta020.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>26
    <FILENAME>a4q-2022investorpresenta021.jpg
    <TEXT>
    Document 26 - file: a4q-2022investorpresenta021.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>27
    <FILENAME>a4q-2022investorpresenta022.jpg
    <TEXT>
    Document 27 - file: a4q-2022investorpresenta022.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>28
    <FILENAME>a4q-2022investorpresenta023.jpg
    <TEXT>
    Document 28 - file: a4q-2022investorpresenta023.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>29
    <FILENAME>a4q-2022investorpresenta024.jpg
    <TEXT>
    Document 29 - file: a4q-2022investorpresenta024.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>30
    <FILENAME>a4q-2022investorpresenta025.jpg
    <TEXT>
    Document 30 - file: a4q-2022investorpresenta025.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>31
    <FILENAME>a4q-2022investorpresenta026.jpg
    <TEXT>
    Document 31 - file: a4q-2022investorpresenta026.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>32
    <FILENAME>a4q-2022investorpresenta027.jpg
    <TEXT>
    Document 32 - file: a4q-2022investorpresenta027.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>33
    <FILENAME>a4q-2022investorpresenta028.jpg
    <TEXT>
    Document 33 - file: a4q-2022investorpresenta028.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>34
    <FILENAME>a4q-2022investorpresenta029.jpg
    <TEXT>
    Document 34 - file: a4q-2022investorpresenta029.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>35
    <FILENAME>a4q-2022investorpresenta030.jpg
    <TEXT>
    Document 35 - file: a4q-2022investorpresenta030.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>36
    <FILENAME>a4q-2022investorpresenta031.jpg
    <TEXT>
    Document 36 - file: a4q-2022investorpresenta031.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>37
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 37 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>38
    <FILENAME>stba-20230213_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 38 - file: stba-20230213_htm.html

    Document 38 - RAW XML: stba-20230213_htm.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>39
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 39 - file: Financial_Report.xlsx

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

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

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>42
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 42 - file: FilingSummary.html

    Document 42 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>44
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 44 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>45
    <FILENAME>0000719220-23-000013-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 45 - file: 0000719220-23-000013-xbrl.zip

    </DOCUMENT>
    </SEC-DOCUMENT>