<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>5</ContextCount>
  <ElementCount>37</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>2</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>2</UnitCount>
  <MyReports>
    <Report instance="cpbi-20251231.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.homefederalne.bank/20251231/taxonomy/role/DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="cpbi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>75010 - Disclosure - SCHEDULE I (Form 5500)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.homefederalne.bank/20251231/taxonomy/role/DisclosureScheduleIForm55001</Role>
      <ShortName>SCHEDULE I (Form 5500)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="cpbi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>75020 - Disclosure - SCHEDULE I (Form 5500) - Schedule of Assets, Liabilities, Income, Expenses, and Transfers for this Plan Year (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.homefederalne.bank/20251231/taxonomy/role/DisclosureScheduleIForm5500ScheduleOfAssetsLiabilitiesIncomeExpensesAndTransfersForThisPlanYearDetails</Role>
      <ShortName>SCHEDULE I (Form 5500) - Schedule of Assets, Liabilities, Income, Expenses, and Transfers for this Plan Year (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.homefederalne.bank/20251231/taxonomy/role/DisclosureScheduleIForm55001</ParentRole>
      <Position>3</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="11-K" isUsgaap="true" original="cpbi-20251231.htm">cpbi-20251231.htm</File>
    <File>cpbi-20251231.xsd</File>
  </InputFiles>
  <SupplementalFiles>
    <File>img226009708_0.jpg</File>
    <File>img226009708_1.jpg</File>
    <File>img226009708_2.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="24">http://fasb.org/us-gaap-ebp/2026</BaseTaxonomy>
    <BaseTaxonomy items="12">http://xbrl.sec.gov/dei/2026</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
