<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>488</ContextCount>
  <ElementCount>483</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>106</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>7</UnitCount>
  <MyReports>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>75000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>75010 - Statement - CONSOLIDATED STATEMENTS OF CONDITION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_StatementCONSOLIDATEDSTATEMENTSOFCONDITION</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CONDITION</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>75020 - Statement - CONSOLIDATED STATEMENTS OF CONDITION (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_StatementCONSOLIDATEDSTATEMENTSOFCONDITIONParenthetical</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CONDITION (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>75030 - Statement - CONSOLIDATED STATEMENTS OF INCOME (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_StatementCONSOLIDATEDSTATEMENTSOFINCOMEUnaudited</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF INCOME (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>75040 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveIncomeUnaudited</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>75050 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_StatementCONSOLIDATEDSTATEMENTSOFCHANGESINSHAREHOLDERSEQUITY</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>75060 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_StatementCONSOLIDATEDSTATEMENTSOFCHANGESINSHAREHOLDERSEQUITYParenthetical</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>75070 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_StatementCONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>995410 - Disclosure - Pay vs Performance Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/PvpDisclosure</Role>
      <ShortName>Pay vs Performance Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.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>10</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995455 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995465 - Disclosure - INVESTMENT SECURITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureINVESTMENTSECURITIES</Role>
      <ShortName>INVESTMENT SECURITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995475 - Disclosure - LOANS AND LEASES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLOANSANDLEASES</Role>
      <ShortName>LOANS AND LEASES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995485 - Disclosure - ALLOWANCE FOR CREDIT LOSSES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureALLOWANCEFORCREDITLOSSES</Role>
      <ShortName>ALLOWANCE FOR CREDIT LOSSES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995495 - Disclosure - DEPOSITS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureDEPOSITS</Role>
      <ShortName>DEPOSITS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995505 - Disclosure - FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureFEDERALHOMELOANBANKADVANCESANDOTHERBORROWINGS</Role>
      <ShortName>FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995515 - Disclosure - BUSINESS SEGMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureBUSINESSSEGMENTS</Role>
      <ShortName>BUSINESS SEGMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995525 - Disclosure - FAIR VALUE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureFAIRVALUE</Role>
      <ShortName>FAIR VALUE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995535 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureREVENUEFROMCONTRACTSWITHCUSTOMERS</Role>
      <ShortName>REVENUE FROM CONTRACTS WITH CUSTOMERS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995545 - Disclosure - OTHER OPERATING EXPENSES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureOTHEROPERATINGEXPENSES</Role>
      <ShortName>OTHER OPERATING EXPENSES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995555 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSS</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995565 - Disclosure - DERIVATIVES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureDERIVATIVES</Role>
      <ShortName>DERIVATIVES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995575 - Disclosure - PREFERRED STOCK</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/DisclosurePreferredStock</Role>
      <ShortName>PREFERRED STOCK</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995585 - Disclosure - SUBORDINATED DEBT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureSUBORDINATEDDEBT</Role>
      <ShortName>SUBORDINATED DEBT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995595 - Disclosure - LEASES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLEASES</Role>
      <ShortName>LEASES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995605 - Disclosure - ACCOUNTING PRONOUNCEMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureACCOUNTINGPRONOUNCEMENTS</Role>
      <ShortName>ACCOUNTING PRONOUNCEMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995625 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995635 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESTables</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995645 - Disclosure - INVESTMENT SECURITIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureINVESTMENTSECURITIESTables</Role>
      <ShortName>INVESTMENT SECURITIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureINVESTMENTSECURITIES</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995655 - Disclosure - LOANS AND LEASES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLOANSANDLEASESTables</Role>
      <ShortName>LOANS AND LEASES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLOANSANDLEASES</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995665 - Disclosure - ALLOWANCE FOR CREDIT LOSSES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureALLOWANCEFORCREDITLOSSESTables</Role>
      <ShortName>ALLOWANCE FOR CREDIT LOSSES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureALLOWANCEFORCREDITLOSSES</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995675 - Disclosure - DEPOSITS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureDEPOSITSTables</Role>
      <ShortName>DEPOSITS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureDEPOSITS</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995685 - Disclosure - BUSINESS SEGMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureBUSINESSSEGMENTSTables</Role>
      <ShortName>BUSINESS SEGMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureBUSINESSSEGMENTS</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995695 - Disclosure - FAIR VALUE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureFAIRVALUETables</Role>
      <ShortName>FAIR VALUE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureFAIRVALUE</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>995705 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureREVENUEFROMCONTRACTSWITHCUSTOMERSTables</Role>
      <ShortName>REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureREVENUEFROMCONTRACTSWITHCUSTOMERS</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>995715 - Disclosure - OTHER OPERATING EXPENSES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureOTHEROPERATINGEXPENSESTables</Role>
      <ShortName>OTHER OPERATING EXPENSES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureOTHEROPERATINGEXPENSES</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>995725 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSTables</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSS</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>995735 - Disclosure - DERIVATIVES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureDERIVATIVESTables</Role>
      <ShortName>DERIVATIVES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureDERIVATIVES</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>995745 - Disclosure - LEASES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLEASESTables</Role>
      <ShortName>LEASES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLEASES</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>995755 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAdditionalInformationDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>995785 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Changes in Restricted Common Shares) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESScheduleOfChangesInRestrictedCommonSharesDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Changes in Restricted Common Shares) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESTables</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>995805 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Calculation of Basic and Diluted Earnings per Share) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESScheduleOfCalculationOfBasicAndDilutedEarningsPerShareDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Calculation of Basic and Diluted Earnings per Share) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESTables</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>995815 - Disclosure - INVESTMENT SECURITIES (Schedule of Amortized Cost and Approximate Fair Value of Securities Available for Sale) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureINVESTMENTSECURITIESScheduleOfAmortizedCostAndApproximateFairValueOfSecuritiesAvailableForSaleDetails</Role>
      <ShortName>INVESTMENT SECURITIES (Schedule of Amortized Cost and Approximate Fair Value of Securities Available for Sale) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureINVESTMENTSECURITIESTables</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>995825 - Disclosure - INVESTMENT SECURITIES - Summary of Gross Gains, Gross Losses and Net Tax Benefit Related to Proceeds on Sales of Securities Available for Sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureINVESTMENTSECURITIESSummaryOfGrossGainsGrossLossesAndNetTaxBenefitRelatedToProceedsOnSalesOfSecuritiesAvailableForSaleDetails</Role>
      <ShortName>INVESTMENT SECURITIES - Summary of Gross Gains, Gross Losses and Net Tax Benefit Related to Proceeds on Sales of Securities Available for Sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>995835 - Disclosure - INVESTMENT SECURITIES (Schedule of Available for Sale Securities in Continuous Unrealized Loss Position and Approximate Fair Value of Investments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureINVESTMENTSECURITIESScheduleOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionAndApproximateFairValueOfInvestmentsDetails</Role>
      <ShortName>INVESTMENT SECURITIES (Schedule of Available for Sale Securities in Continuous Unrealized Loss Position and Approximate Fair Value of Investments) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureINVESTMENTSECURITIESTables</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>995845 - Disclosure - INVESTMENT SECURITIES - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureINVESTMENTSECURITIESAdditionalInformationDetails</Role>
      <ShortName>INVESTMENT SECURITIES - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>995855 - Disclosure - LOANS AND LEASES (Schedule of Loans Outstanding, by Type of Loan) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLOANSANDLEASESScheduleOfLoansOutstandingByTypeOfLoanDetails</Role>
      <ShortName>LOANS AND LEASES (Schedule of Loans Outstanding, by Type of Loan) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLOANSANDLEASESTables</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>995865 - Disclosure - LOANS AND LEASES (Schedule of Loan Balances by Pool Segment and Portfolio Class) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLOANSANDLEASESScheduleOfLoanBalancesByPoolSegmentAndPortfolioClassDetails</Role>
      <ShortName>LOANS AND LEASES (Schedule of Loan Balances by Pool Segment and Portfolio Class) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLOANSANDLEASESTables</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>995875 - Disclosure - LOANS AND LEASES (Schedule of Recorded Investment in Nonaccrual and Loans Past Due 90 Days or Over Still On Accrual) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/DisclosureLoansAndLeasesScheduleOfRecordedInvestmentInNonaccrualAndLoansPastDue90DaysOrOverStillOnAccrualDetails</Role>
      <ShortName>LOANS AND LEASES (Schedule of Recorded Investment in Nonaccrual and Loans Past Due 90 Days or Over Still On Accrual) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLOANSANDLEASESTables</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>995885 - Disclosure - LOANS AND LEASES (Schedule of Aging of Past Due Loans) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLOANSANDLEASESScheduleOfAgingOfPastDueLoansDetails</Role>
      <ShortName>LOANS AND LEASES (Schedule of Aging of Past Due Loans) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLOANSANDLEASESTables</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>995895 - Disclosure - LOANS AND LEASES - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLOANSANDLEASESAdditionalInformationDetails</Role>
      <ShortName>LOANS AND LEASES - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>995905 - Disclosure - LOANS AND LEASES (Summary of Credit Risk Profile of Loans) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLOANSANDLEASESSummaryOfCreditRiskProfileOfLoansDetails</Role>
      <ShortName>LOANS AND LEASES (Summary of Credit Risk Profile of Loans) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLOANSANDLEASESTables</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>995915 - Disclosure - LOANS AND LEASES (Summary of Information Related to Modification) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/DisclosureLoansAndLeasesSummaryOfInformationRelatedToModificationDetails</Role>
      <ShortName>LOANS AND LEASES (Summary of Information Related to Modification) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLOANSANDLEASESTables</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>995925 - Disclosure - LOANS AND LEASES - (Schedule of Loans Modifications as Subsequent Default, By Payment Status (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/DisclosureLoansAndLeasesScheduleOfLoansModificationsAsSubsequentDefaultByPaymentStatusDetails</Role>
      <ShortName>LOANS AND LEASES - (Schedule of Loans Modifications as Subsequent Default, By Payment Status (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLOANSANDLEASESTables</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>995935 - Disclosure - LOANS AND LEASES (Schedule of Loans Modifications Resulted in Payment Default (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/DisclosureLoansAndLeasesScheduleOfLoansModificationsResultedInPaymentDefaultDetails</Role>
      <ShortName>LOANS AND LEASES (Schedule of Loans Modifications Resulted in Payment Default (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLOANSANDLEASESTables</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>995965 - Disclosure - ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureALLOWANCEFORCREDITLOSSESAdditionalInformationDetails</Role>
      <ShortName>ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>995975 - Disclosure - ALLOWANCE FOR CREDIT LOSSES (Schedule of Balances by Segment) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureALLOWANCEFORCREDITLOSSESScheduleOfBalancesBySegmentDetails</Role>
      <ShortName>ALLOWANCE FOR CREDIT LOSSES (Schedule of Balances by Segment) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureALLOWANCEFORCREDITLOSSESTables</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>995985 - Disclosure - ALLOWANCE FOR CREDIT LOSSES (Schedule of Loans Individually Evaluated by Segment) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureALLOWANCEFORCREDITLOSSESScheduleOfLoansIndividuallyEvaluatedBySegmentDetails</Role>
      <ShortName>ALLOWANCE FOR CREDIT LOSSES (Schedule of Loans Individually Evaluated by Segment) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureALLOWANCEFORCREDITLOSSESTables</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>995995 - Disclosure - ALLOWANCE FOR CREDIT LOSSES (Schedule of Activity in Allowance for Loan Losses) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureALLOWANCEFORCREDITLOSSESScheduleOfActivityInAllowanceForLoanLossesDetails</Role>
      <ShortName>ALLOWANCE FOR CREDIT LOSSES (Schedule of Activity in Allowance for Loan Losses) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureALLOWANCEFORCREDITLOSSESTables</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>996005 - Disclosure - ALLOWANCE FOR CREDIT LOSSES (Schedule of Activity in Allowance for Loan Losses) (Parenthetical) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/DisclosureAllowanceForCreditLossesScheduleOfActivityInAllowanceForLoanLossesParentheticalDetails</Role>
      <ShortName>ALLOWANCE FOR CREDIT LOSSES (Schedule of Activity in Allowance for Loan Losses) (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureALLOWANCEFORCREDITLOSSESTables</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>996015 - Disclosure - ALLOWANCE FOR CREDIT LOSSES - (Schedule of Activity in ACL for Off Balance Sheet Commitments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/DisclosureAllowanceForCreditLossesScheduleOfActivityInAclForOffBalanceSheetCommitmentsDetails</Role>
      <ShortName>ALLOWANCE FOR CREDIT LOSSES - (Schedule of Activity in ACL for Off Balance Sheet Commitments) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureALLOWANCEFORCREDITLOSSESTables</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>996025 - Disclosure - DEPOSITS - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureDEPOSITSAdditionalInformationDetails</Role>
      <ShortName>DEPOSITS - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>996035 - Disclosure - DEPOSITS (Schedule of Details of Total Deposits) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureDEPOSITSScheduleOfDetailsOfTotalDepositsDetails</Role>
      <ShortName>DEPOSITS (Schedule of Details of Total Deposits) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureDEPOSITSTables</ParentRole>
      <Position>63</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>996055 - Disclosure - DEPOSITS (Details of Total Deposits) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureDEPOSITSDetailsOfTotalDepositsDetails</Role>
      <ShortName>DEPOSITS (Details of Total Deposits) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureDEPOSITSTables</ParentRole>
      <Position>64</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>996065 - Disclosure - DEPOSITS (Scheduled Maturities of Time Deposits) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureDEPOSITSScheduledMaturitiesOfTimeDepositsDetails</Role>
      <ShortName>DEPOSITS (Scheduled Maturities of Time Deposits) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureDEPOSITSTables</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>996075 - Disclosure - FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureFEDERALHOMELOANBANKADVANCESANDOTHERBORROWINGSAdditionalInformationDetails</Role>
      <ShortName>FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>996085 - Disclosure - BUSINESS SEGMENTS - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureBUSINESSSEGMENTSAdditionalInformationDetails</Role>
      <ShortName>BUSINESS SEGMENTS - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>996095 - Disclosure - BUSINESS SEGMENTS - Schedule of Income and Total Assets for Reportable Segments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureBUSINESSSEGMENTSScheduleOfIncomeAndTotalAssetsForReportableSegmentsDetails</Role>
      <ShortName>BUSINESS SEGMENTS - Schedule of Income and Total Assets for Reportable Segments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>996105 - Disclosure - FAIR VALUE - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureFAIRVALUEAdditionalInformationDetails</Role>
      <ShortName>FAIR VALUE - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>996115 - Disclosure - FAIR VALUE (Schedule of Assets Measured on a Recurring Basis) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureFAIRVALUEScheduleOfAssetsMeasuredOnRecurringBasisDetails</Role>
      <ShortName>FAIR VALUE (Schedule of Assets Measured on a Recurring Basis) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureFAIRVALUETables</ParentRole>
      <Position>70</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>996125 - Disclosure - FAIR VALUE - (Shedule of Residential Loans Heldfor Sale, at Fair Value) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/DisclosureFairValueSheduleOfResidentialLoansHeldforSaleAtFairValueDetails</Role>
      <ShortName>FAIR VALUE - (Shedule of Residential Loans Heldfor Sale, at Fair Value) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureFAIRVALUETables</ParentRole>
      <Position>71</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>996135 - Disclosure - FAIR VALUE (Schedule of Assets Measured on a Non-Recurring Basis) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureFAIRVALUEScheduleOfAssetsMeasuredOnNonRecurringBasisDetails</Role>
      <ShortName>FAIR VALUE (Schedule of Assets Measured on a Non-Recurring Basis) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureFAIRVALUETables</ParentRole>
      <Position>72</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>996145 - Disclosure - FAIR VALUE (Schedule of Financial Instruments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureFAIRVALUEScheduleOfFinancialInstrumentsDetails</Role>
      <ShortName>FAIR VALUE (Schedule of Financial Instruments) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureFAIRVALUETables</ParentRole>
      <Position>73</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>996155 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS (Schedule of Noninterest Income) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureREVENUEFROMCONTRACTSWITHCUSTOMERSScheduleOfNoninterestIncomeDetails</Role>
      <ShortName>REVENUE FROM CONTRACTS WITH CUSTOMERS (Schedule of Noninterest Income) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureREVENUEFROMCONTRACTSWITHCUSTOMERSTables</ParentRole>
      <Position>74</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>996165 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS (Schedule of Noninterest Income by Operating Segment) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureREVENUEFROMCONTRACTSWITHCUSTOMERSScheduleOfNoninterestIncomeByOperatingSegmentDetails</Role>
      <ShortName>REVENUE FROM CONTRACTS WITH CUSTOMERS (Schedule of Noninterest Income by Operating Segment) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureREVENUEFROMCONTRACTSWITHCUSTOMERSTables</ParentRole>
      <Position>75</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>996175 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureREVENUEFROMCONTRACTSWITHCUSTOMERSAdditionalInformationDetails</Role>
      <ShortName>REVENUE FROM CONTRACTS WITH CUSTOMERS - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>996185 - Disclosure - OTHER OPERATING EXPENSES (Schedule of Components of Other Operating Expenses) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureOTHEROPERATINGEXPENSESScheduleOfComponentsOfOtherOperatingExpensesDetails</Role>
      <ShortName>OTHER OPERATING EXPENSES (Schedule of Components of Other Operating Expenses) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureOTHEROPERATINGEXPENSESTables</ParentRole>
      <Position>77</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>996205 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Schedule of Accumulated Other Comprehensive Income/(Loss) Balances, Net of Tax) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSScheduleOfAccumulatedOtherComprehensiveIncomeLossBalancesNetOfTaxDetails</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Schedule of Accumulated Other Comprehensive Income/(Loss) Balances, Net of Tax) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSTables</ParentRole>
      <Position>78</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>996215 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Schedule of Reclassifications Out of Accumulated Other Comprehensive Income) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSScheduleOfReclassificationsOutOfAccumulatedOtherComprehensiveIncomeDetails</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Schedule of Reclassifications Out of Accumulated Other Comprehensive Income) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSTables</ParentRole>
      <Position>79</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>996225 - Disclosure - DERIVATIVES - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureDERIVATIVESAdditionalInformationDetails</Role>
      <ShortName>DERIVATIVES - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>996235 - Disclosure - DERIVATIVES - (Schedule of Information about Interest Rate Swaps Designated as Cash Flow Hedges) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureDERIVATIVESScheduleOfInformationAboutInterestRateSwapsDesignatedAsCashFlowHedgesDetails</Role>
      <ShortName>DERIVATIVES - (Schedule of Information about Interest Rate Swaps Designated as Cash Flow Hedges) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureDERIVATIVESTables</ParentRole>
      <Position>81</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>996245 - Disclosure - DERIVATIVES - (Schedule of Cash Flow Hedges Included in Financial Statements) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureDERIVATIVESScheduleOfCashFlowHedgesIncludedInFinancialStatementsDetails</Role>
      <ShortName>DERIVATIVES - (Schedule of Cash Flow Hedges Included in Financial Statements) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureDERIVATIVESTables</ParentRole>
      <Position>82</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>996255 - Disclosure - DERIVATIVES - (Schedule of Net Gains/(Loss) Recorded in Accumulated Other Comprehensive Income/(Loss)) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureDERIVATIVESScheduleOfNetGainsLossRecordedInAccumulatedOtherComprehensiveIncomeLossDetails</Role>
      <ShortName>DERIVATIVES - (Schedule of Net Gains/(Loss) Recorded in Accumulated Other Comprehensive Income/(Loss)) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureDERIVATIVESTables</ParentRole>
      <Position>83</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>996265 - Disclosure - PREFERRED STOCK - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/DisclosurePreferredStockAdditionalInformationDetails</Role>
      <ShortName>PREFERRED STOCK - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>996275 - Disclosure - SUBORDINATED DEBT - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureSUBORDINATEDDEBTAdditionalInformationDetails</Role>
      <ShortName>SUBORDINATED DEBT - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>996285 - Disclosure - LEASES - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLEASESAdditionalInformationDetails</Role>
      <ShortName>LEASES - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>996295 - Disclosure - LEASES (Schedule of Operating Lease Liabilities by Contractual Maturity) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLEASESScheduleOfOperatingLeaseLiabilitiesByContractualMaturityDetails</Role>
      <ShortName>LEASES (Schedule of Operating Lease Liabilities by Contractual Maturity) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLEASESTables</ParentRole>
      <Position>87</Position>
    </Report>
    <Report instance="pgc-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>996315 - Disclosure - LEASES (Summary of Supplemental Cash Flow Information Related to Direct Finance and Operating Leases) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLEASESSummaryOfSupplementalCashFlowInformationRelatedToDirectFinanceAndOperatingLeasesDetails</Role>
      <ShortName>LEASES (Summary of Supplemental Cash Flow Information Related to Direct Finance and Operating Leases) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.pgbank.co/20260331/taxonomy/role/Role_DisclosureLEASESTables</ParentRole>
      <Position>88</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="pgc-20260331.htm">pgc-20260331.htm</File>
    <File>pgc-20260331.xsd</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="2">http://fasb.org/srt/2025</BaseTaxonomy>
    <BaseTaxonomy items="1794">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="30">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
