<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>14</ContextCount>
  <ElementCount>21</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>3</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>4</UnitCount>
  <MyReports>
    <Report instance="nbhc-20260228x11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>00090 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nationalbankholdings.com/role/DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="nbhc-20260228x11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>00100 - Statement - Statements of Financial Condition</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nationalbankholdings.com/role/StatementStatementsOfFinancialCondition</Role>
      <ShortName>Statements of Financial Condition</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="nbhc-20260228x11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>00200 - Statement - Statements of Income and Changes in Plan Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nationalbankholdings.com/role/StatementStatementsOfIncomeAndChangesInPlanEquity</Role>
      <ShortName>Statements of Income and Changes in Plan Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="nbhc-20260228x11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>10101 - Disclosure - DESCRIPTION OF THE PLAN</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nationalbankholdings.com/role/DisclosureDescriptionOfPlan</Role>
      <ShortName>DESCRIPTION OF THE PLAN</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="nbhc-20260228x11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>10201 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nationalbankholdings.com/role/DisclosureSummaryOfSignificantAccountingPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="nbhc-20260228x11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>10301 - Disclosure - FEDERAL INCOME TAX STATUS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nationalbankholdings.com/role/DisclosureFederalIncomeTaxStatus</Role>
      <ShortName>FEDERAL INCOME TAX STATUS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="nbhc-20260228x11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>30103 - Disclosure - DESCRIPTION OF THE PLAN (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nationalbankholdings.com/role/DisclosureDescriptionOfPlanTables</Role>
      <ShortName>DESCRIPTION OF THE PLAN (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://nationalbankholdings.com/role/DisclosureDescriptionOfPlan</ParentRole>
      <Position>7</Position>
    </Report>
    <Report instance="nbhc-20260228x11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>40101 - Disclosure - DESCRIPTION OF THE PLAN (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nationalbankholdings.com/role/DisclosureDescriptionOfPlanDetails</Role>
      <ShortName>DESCRIPTION OF THE PLAN (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://nationalbankholdings.com/role/DisclosureDescriptionOfPlanTables</ParentRole>
      <Position>8</Position>
    </Report>
    <Report instance="nbhc-20260228x11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>40102 - Disclosure - DESCRIPTION OF THE PLAN - Stock Purchase Provisions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nationalbankholdings.com/role/DisclosureDescriptionOfPlanStockPurchaseProvisionsDetails</Role>
      <ShortName>DESCRIPTION OF THE PLAN - Stock Purchase Provisions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>nbhc-20260228.xsd</File>
    <File>nbhc-20260228_def.xml</File>
    <File>nbhc-20260228_lab.xml</File>
    <File>nbhc-20260228_pre.xml</File>
    <File doctype="11-K" isDefinitelyFs="true" isUsgaap="true" original="nbhc-20260228x11k.htm">nbhc-20260228x11k.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="25">http://fasb.org/us-gaap-ebp/2026</BaseTaxonomy>
    <BaseTaxonomy items="8">http://xbrl.sec.gov/dei/2026</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
