<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>1059</ContextCount>
  <ElementCount>502</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>126</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>9</UnitCount>
  <MyReports>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>9952151 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS</Role>
      <ShortName>CONDENSED CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952152 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical</Role>
      <ShortName>CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952153 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF INCOME (unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFINCOMEunaudited</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF INCOME (unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952154 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF INCOME (unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFINCOMEunauditedParenthetical</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF INCOME (unaudited) (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952155 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEunaudited</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952156 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEunauditedParenthetical</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952157 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS??? EQUITY (unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINSHAREHOLDERSEQUITYunaudited</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS??? EQUITY (unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952158 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS??? EQUITY (unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINSHAREHOLDERSEQUITYunauditedParenthetical</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS??? EQUITY (unaudited) (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952159 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSunaudited</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952160 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND DISCLOSURE RULES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDDISCLOSURERULES</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND DISCLOSURE RULES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952161 - Disclosure - RECENT ACCOUNTING PRONOUNCEMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/RECENTACCOUNTINGPRONOUNCEMENTS</Role>
      <ShortName>RECENT ACCOUNTING PRONOUNCEMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952162 - Disclosure - BUSINESS COMBINATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/BUSINESSCOMBINATION</Role>
      <ShortName>BUSINESS COMBINATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952163 - Disclosure - SECURITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/SECURITIES</Role>
      <ShortName>SECURITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952164 - Disclosure - LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LOANSRECEIVABLEANDALLOWANCEFORCREDITLOSSES</Role>
      <ShortName>LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952165 - Disclosure - LEASES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LEASES</Role>
      <ShortName>LEASES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952166 - Disclosure - DEPOSITS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/DEPOSITS</Role>
      <ShortName>DEPOSITS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9952167 - Disclosure - BORROWINGS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/BORROWINGS</Role>
      <ShortName>BORROWINGS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9952168 - Disclosure - RELATED PARTY TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/RELATEDPARTYTRANSACTIONS</Role>
      <ShortName>RELATED PARTY TRANSACTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9952169 - Disclosure - OFF-BALANCE SHEET COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/OFFBALANCESHEETCOMMITMENTSANDCONTINGENCIES</Role>
      <ShortName>OFF-BALANCE SHEET COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9952170 - Disclosure - STOCK COMPENSATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/STOCKCOMPENSATION</Role>
      <ShortName>STOCK COMPENSATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9952171 - Disclosure - EARNINGS PER COMMON SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/EARNINGSPERCOMMONSHARE</Role>
      <ShortName>EARNINGS PER COMMON SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9952172 - Disclosure - DERIVATIVE INSTRUMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/DERIVATIVEINSTRUMENTS</Role>
      <ShortName>DERIVATIVE INSTRUMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9952173 - Disclosure - FAIR VALUE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/FAIRVALUE</Role>
      <ShortName>FAIR VALUE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9952174 - Disclosure - SEGMENT REPORTING</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/SEGMENTREPORTING</Role>
      <ShortName>SEGMENT REPORTING</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND DISCLOSURE RULES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDDISCLOSURERULESPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND DISCLOSURE RULES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9955512 - Disclosure - BUSINESS COMBINATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/BUSINESSCOMBINATIONTables</Role>
      <ShortName>BUSINESS COMBINATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.progbank.com/role/BUSINESSCOMBINATION</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9955513 - Disclosure - SECURITIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/SECURITIESTables</Role>
      <ShortName>SECURITIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.progbank.com/role/SECURITIES</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9955514 - Disclosure - LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LOANSRECEIVABLEANDALLOWANCEFORCREDITLOSSESTables</Role>
      <ShortName>LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.progbank.com/role/LOANSRECEIVABLEANDALLOWANCEFORCREDITLOSSES</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9955515 - Disclosure - LEASES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LEASESTables</Role>
      <ShortName>LEASES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.progbank.com/role/LEASES</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - DEPOSITS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/DEPOSITSTables</Role>
      <ShortName>DEPOSITS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.progbank.com/role/DEPOSITS</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9955517 - Disclosure - BORROWINGS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/BORROWINGSTables</Role>
      <ShortName>BORROWINGS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.progbank.com/role/BORROWINGS</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - RELATED PARTY TRANSACTIONS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/RELATEDPARTYTRANSACTIONSTables</Role>
      <ShortName>RELATED PARTY TRANSACTIONS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.progbank.com/role/RELATEDPARTYTRANSACTIONS</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9955519 - Disclosure - OFF-BALANCE SHEET COMMITMENTS AND CONTINGENCIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/OFFBALANCESHEETCOMMITMENTSANDCONTINGENCIESTables</Role>
      <ShortName>OFF-BALANCE SHEET COMMITMENTS AND CONTINGENCIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.progbank.com/role/OFFBALANCESHEETCOMMITMENTSANDCONTINGENCIES</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9955520 - Disclosure - STOCK COMPENSATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/STOCKCOMPENSATIONTables</Role>
      <ShortName>STOCK COMPENSATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.progbank.com/role/STOCKCOMPENSATION</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - EARNINGS PER COMMON SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/EARNINGSPERCOMMONSHARETables</Role>
      <ShortName>EARNINGS PER COMMON SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.progbank.com/role/EARNINGSPERCOMMONSHARE</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9955522 - Disclosure - DERIVATIVE INSTRUMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/DERIVATIVEINSTRUMENTSTables</Role>
      <ShortName>DERIVATIVE INSTRUMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.progbank.com/role/DERIVATIVEINSTRUMENTS</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - FAIR VALUE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/FAIRVALUETables</Role>
      <ShortName>FAIR VALUE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.progbank.com/role/FAIRVALUE</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9955524 - Disclosure - SEGMENT REPORTING (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/SEGMENTREPORTINGTables</Role>
      <ShortName>SEGMENT REPORTING (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.progbank.com/role/SEGMENTREPORTING</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND DISCLOSURE RULES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDDISCLOSURERULESDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND DISCLOSURE RULES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.progbank.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDDISCLOSURERULESPolicies</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - RECENT ACCOUNTING PRONOUNCEMENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/RECENTACCOUNTINGPRONOUNCEMENTSDetails</Role>
      <ShortName>RECENT ACCOUNTING PRONOUNCEMENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.progbank.com/role/RECENTACCOUNTINGPRONOUNCEMENTS</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9955527 - Disclosure - BUSINESS COMBINATION - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/BUSINESSCOMBINATIONAdditionalInformationDetails</Role>
      <ShortName>BUSINESS COMBINATION - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9955528 - Disclosure - BUSINESS COMBINATION - Schedule of Merger consideration (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/BUSINESSCOMBINATIONScheduleofMergerconsiderationDetails</Role>
      <ShortName>BUSINESS COMBINATION - Schedule of Merger consideration (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9955529 - Disclosure - BUSINESS COMBINATION - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/BUSINESSCOMBINATIONScheduleofRecognizedIdentifiedAssetsAcquiredandLiabilitiesAssumedDetails</Role>
      <ShortName>BUSINESS COMBINATION - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9955530 - Disclosure - BUSINESS COMBINATION - Schedule of Credit Risk Profile by Risk Rating (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/BUSINESSCOMBINATIONScheduleofCreditRiskProfilebyRiskRatingDetails</Role>
      <ShortName>BUSINESS COMBINATION - Schedule of Credit Risk Profile by Risk Rating (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9955531 - Disclosure - SECURITIES - Schedule of Securities Available for Sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/SECURITIESScheduleofSecuritiesAvailableforSaleDetails</Role>
      <ShortName>SECURITIES - Schedule of Securities Available for Sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9955532 - Disclosure - SECURITIES - Schedule of Securities Held-to-Maturities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/SECURITIESScheduleofSecuritiesHeldtoMaturitiesDetails</Role>
      <ShortName>SECURITIES - Schedule of Securities Held-to-Maturities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9955533 - Disclosure - SECURITIES - Schedule of Information Pertaining to Security Sales (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/SECURITIESScheduleofInformationPertainingtoSecuritySalesDetails</Role>
      <ShortName>SECURITIES - Schedule of Information Pertaining to Security Sales (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9955534 - Disclosure - SECURITIES - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/SECURITIESAdditionalInformationDetails</Role>
      <ShortName>SECURITIES - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9955535 - Disclosure - SECURITIES - Schedule of Contractual Maturity of Securities Available for Sale, Excluding Equity Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/SECURITIESScheduleofContractualMaturityofSecuritiesAvailableforSaleExcludingEquitySecuritiesDetails</Role>
      <ShortName>SECURITIES - Schedule of Contractual Maturity of Securities Available for Sale, Excluding Equity Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9955536 - Disclosure - SECURITIES - Schedule of AFS with Unrealized Loss Position (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/SECURITIESScheduleofAFSwithUnrealizedLossPositionDetails</Role>
      <ShortName>SECURITIES - Schedule of AFS with Unrealized Loss Position (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9955537 - Disclosure - SECURITIES - Schedule of HTM with Unrealized Loss Position (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/SECURITIESScheduleofHTMwithUnrealizedLossPositionDetails</Role>
      <ShortName>SECURITIES - Schedule of HTM with Unrealized Loss Position (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9955538 - Disclosure - SECURITIES - Schedule of Trading Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/SECURITIESScheduleofTradingSecuritiesDetails</Role>
      <ShortName>SECURITIES - Schedule of Trading Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9955539 - Disclosure - LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Net Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LOANSRECEIVABLEANDALLOWANCEFORCREDITLOSSESScheduleofNetLoansDetails</Role>
      <ShortName>LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Net Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9955540 - Disclosure - LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LOANSRECEIVABLEANDALLOWANCEFORCREDITLOSSESAdditionalInformationDetails</Role>
      <ShortName>LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9955541 - Disclosure - LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Allowance for Loan Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LOANSRECEIVABLEANDALLOWANCEFORCREDITLOSSESScheduleofAllowanceforLoanLossesDetails</Role>
      <ShortName>LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Allowance for Loan Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9955542 - Disclosure - LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Nonaccrual Loans and Loans Past Due over 89 Days Still Accruing Interest by Class of Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LOANSRECEIVABLEANDALLOWANCEFORCREDITLOSSESScheduleofNonaccrualLoansandLoansPastDueover89DaysStillAccruingInterestbyClassofLoansDetails</Role>
      <ShortName>LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Nonaccrual Loans and Loans Past Due over 89 Days Still Accruing Interest by Class of Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9955543 - Disclosure - LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Amortized Cost Basis of Collateral-Dependent Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LOANSRECEIVABLEANDALLOWANCEFORCREDITLOSSESScheduleofAmortizedCostBasisofCollateralDependentLoansDetails</Role>
      <ShortName>LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Amortized Cost Basis of Collateral-Dependent Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9955544 - Disclosure - LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Aging of Recorded Investment in Past Due Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LOANSRECEIVABLEANDALLOWANCEFORCREDITLOSSESScheduleofAgingofRecordedInvestmentinPastDueLoansDetails</Role>
      <ShortName>LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Aging of Recorded Investment in Past Due Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9955545 - Disclosure - LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Amortized Cost Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LOANSRECEIVABLEANDALLOWANCEFORCREDITLOSSESScheduleofAmortizedCostBasisDetails</Role>
      <ShortName>LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Amortized Cost Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9955546 - Disclosure - LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Performance of Loans Modified (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LOANSRECEIVABLEANDALLOWANCEFORCREDITLOSSESScheduleofPerformanceofLoansModifiedDetails</Role>
      <ShortName>LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Performance of Loans Modified (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9955547 - Disclosure - LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Financial Effect of Loan Modifications (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LOANSRECEIVABLEANDALLOWANCEFORCREDITLOSSESScheduleofFinancialEffectofLoanModificationsDetails</Role>
      <ShortName>LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Financial Effect of Loan Modifications (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9955548 - Disclosure - LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Credit Risk Profile By Risk Rating (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LOANSRECEIVABLEANDALLOWANCEFORCREDITLOSSESScheduleofCreditRiskProfileByRiskRatingDetails</Role>
      <ShortName>LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Credit Risk Profile By Risk Rating (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9955549 - Disclosure - LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Risk Rating (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LOANSRECEIVABLEANDALLOWANCEFORCREDITLOSSESScheduleofRiskRatingDetails</Role>
      <ShortName>LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Risk Rating (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9955550 - Disclosure - LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Recorded Investment in Residential, Consumer and Credit Card Loans Based on Payment Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LOANSRECEIVABLEANDALLOWANCEFORCREDITLOSSESScheduleofRecordedInvestmentinResidentialConsumerandCreditCardLoansBasedonPaymentActivityDetails</Role>
      <ShortName>LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Recorded Investment in Residential, Consumer and Credit Card Loans Based on Payment Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9955551 - Disclosure - LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Nonperforming Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LOANSRECEIVABLEANDALLOWANCEFORCREDITLOSSESScheduleofNonperformingLoansDetails</Role>
      <ShortName>LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Nonperforming Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9955552 - Disclosure - LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Recorded Investment in Residential, Consumer and Credit Card Loans Based on Payment Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LOANSRECEIVABLEANDALLOWANCEFORCREDITLOSSESScheduleofRecordedInvestmentinResidentialConsumerandCreditCardLoansBasedonPaymentActivityDetails_1</Role>
      <ShortName>LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Recorded Investment in Residential, Consumer and Credit Card Loans Based on Payment Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9955553 - Disclosure - LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Holiday's Loan Portfolio (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LOANSRECEIVABLEANDALLOWANCEFORCREDITLOSSESScheduleofHolidaysLoanPortfolioDetails</Role>
      <ShortName>LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Holiday's Loan Portfolio (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>9955554 - Disclosure - LEASES - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LEASESAdditionalInformationDetails</Role>
      <ShortName>LEASES - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>9955555 - Disclosure - LEASES - Schedule of Operating and Finance Lease Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LEASESScheduleofOperatingandFinanceLeaseLiabilitiesDetails</Role>
      <ShortName>LEASES - Schedule of Operating and Finance Lease Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>9955556 - Disclosure - LEASES - Schedule of Lease Cost (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LEASESScheduleofLeaseCostDetails</Role>
      <ShortName>LEASES - Schedule of Lease Cost (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>9955557 - Disclosure - LEASES - Schedule of Maturity of Lease Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LEASESScheduleofMaturityofLeaseLiabilitiesDetails</Role>
      <ShortName>LEASES - Schedule of Maturity of Lease Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>9955558 - Disclosure - LEASES - Schedule of Weighted Average Lease Term and Discount Rate (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LEASESScheduleofWeightedAverageLeaseTermandDiscountRateDetails</Role>
      <ShortName>LEASES - Schedule of Weighted Average Lease Term and Discount Rate (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>9955559 - Disclosure - LEASES - Schedule of Other Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/LEASESScheduleofOtherInformationDetails</Role>
      <ShortName>LEASES - Schedule of Other Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>9955560 - Disclosure - DEPOSITS - Schedule of Time Certificates of Deposit Accounts Included in Total Deposits and Their Remaining Maturities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/DEPOSITSScheduleofTimeCertificatesofDepositAccountsIncludedinTotalDepositsandTheirRemainingMaturitiesDetails</Role>
      <ShortName>DEPOSITS - Schedule of Time Certificates of Deposit Accounts Included in Total Deposits and Their Remaining Maturities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>9955561 - Disclosure - DEPOSITS - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/DEPOSITSAdditionalInformationDetails</Role>
      <ShortName>DEPOSITS - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>9955562 - Disclosure - BORROWINGS - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/BORROWINGSAdditionalInformationDetails</Role>
      <ShortName>BORROWINGS - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>9955563 - Disclosure - BORROWINGS - Schedule of Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/BORROWINGSScheduleofDebtDetails</Role>
      <ShortName>BORROWINGS - Schedule of Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>9955564 - Disclosure - RELATED PARTY TRANSACTIONS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/RELATEDPARTYTRANSACTIONSDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.progbank.com/role/RELATEDPARTYTRANSACTIONSTables</ParentRole>
      <Position>80</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>9955565 - Disclosure - OFF-BALANCE SHEET COMMITMENTS AND CONTINGENCIES - Schedule of Off-Balance Sheet Risks (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/OFFBALANCESHEETCOMMITMENTSANDCONTINGENCIESScheduleofOffBalanceSheetRisksDetails</Role>
      <ShortName>OFF-BALANCE SHEET COMMITMENTS AND CONTINGENCIES - Schedule of Off-Balance Sheet Risks (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>9955566 - Disclosure - OFF-BALANCE SHEET COMMITMENTS AND CONTINGENCIES - Schedule of Allowance for Credit Losses on Unfunded Loan Commitments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/OFFBALANCESHEETCOMMITMENTSANDCONTINGENCIESScheduleofAllowanceforCreditLossesonUnfundedLoanCommitmentsDetails</Role>
      <ShortName>OFF-BALANCE SHEET COMMITMENTS AND CONTINGENCIES - Schedule of Allowance for Credit Losses on Unfunded Loan Commitments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>9955567 - Disclosure - OFF-BALANCE SHEET COMMITMENTS AND CONTINGENCIES - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/OFFBALANCESHEETCOMMITMENTSANDCONTINGENCIESAdditionalInformationDetails</Role>
      <ShortName>OFF-BALANCE SHEET COMMITMENTS AND CONTINGENCIES - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>9955568 - Disclosure - STOCK COMPENSATION - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/STOCKCOMPENSATIONAdditionalInformationDetails</Role>
      <ShortName>STOCK COMPENSATION - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>9955569 - Disclosure - STOCK COMPENSATION - Schedule of Changes in Unvested Restricted Stock Awards (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/STOCKCOMPENSATIONScheduleofChangesinUnvestedRestrictedStockAwardsDetails</Role>
      <ShortName>STOCK COMPENSATION - Schedule of Changes in Unvested Restricted Stock Awards (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>9955570 - Disclosure - EARNINGS PER COMMON SHARE - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/EARNINGSPERCOMMONSHAREAdditionalInformationDetails</Role>
      <ShortName>EARNINGS PER COMMON SHARE - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>9955571 - Disclosure - EARNINGS PER COMMON SHARE - Schedule of Computation of Basic and Diluted Earnings Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/EARNINGSPERCOMMONSHAREScheduleofComputationofBasicandDilutedEarningsPerShareDetails</Role>
      <ShortName>EARNINGS PER COMMON SHARE - Schedule of Computation of Basic and Diluted Earnings Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>9955572 - Disclosure - DERIVATIVE INSTRUMENTS - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/DERIVATIVEINSTRUMENTSAdditionalInformationDetails</Role>
      <ShortName>DERIVATIVE INSTRUMENTS - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>9955573 - Disclosure - DERIVATIVE INSTRUMENTS - Schedule of Amounts and Locations of Activity Related to Back-to-Back Interest Rate Swaps (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/DERIVATIVEINSTRUMENTSScheduleofAmountsandLocationsofActivityRelatedtoBacktoBackInterestRateSwapsDetails</Role>
      <ShortName>DERIVATIVE INSTRUMENTS - Schedule of Amounts and Locations of Activity Related to Back-to-Back Interest Rate Swaps (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>9955574 - Disclosure - FAIR VALUE - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/FAIRVALUEScheduleofAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetails</Role>
      <ShortName>FAIR VALUE - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>9955575 - Disclosure - FAIR VALUE - Schedule of Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/FAIRVALUEScheduleofAssetsandLiabilitiesMeasuredatFairValueonNonRecurringBasisDetails</Role>
      <ShortName>FAIR VALUE - Schedule of Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>9955576 - Disclosure - FAIR VALUE - Schedule of Quantitative Information about Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on Non Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/FAIRVALUEScheduleofQuantitativeInformationaboutLevel3FairValueMeasurementsforFinancialInstrumentsMeasuredatFairValueonNonRecurringBasisDetails</Role>
      <ShortName>FAIR VALUE - Schedule of Quantitative Information about Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on Non Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>9955577 - Disclosure - FAIR VALUE - Schedule of Carrying Amount and Fair Value of Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/FAIRVALUEScheduleofCarryingAmountandFairValueofFinancialInstrumentsDetails</Role>
      <ShortName>FAIR VALUE - Schedule of Carrying Amount and Fair Value of Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="ccne-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>9955578 - Disclosure - SEGMENT REPORTING (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.progbank.com/role/SEGMENTREPORTINGDetails</Role>
      <ShortName>SEGMENT REPORTING (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.progbank.com/role/SEGMENTREPORTINGTables</ParentRole>
      <Position>94</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="ccne-20260331.htm">ccne-20260331.htm</File>
    <File>ccne-20260331.xsd</File>
    <File>ccne-20260331_cal.xml</File>
    <File>ccne-20260331_def.xml</File>
    <File>ccne-20260331_lab.xml</File>
    <File>ccne-20260331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="3606">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="33">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
