<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>437</ContextCount>
  <ElementCount>512</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>80</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>10</UnitCount>
  <MyReports>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>995100 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/dei/role/document/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>995300 - Document - Audit Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/dei/role/document/AuditInformation</Role>
      <ShortName>Audit Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>995301 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/ConsolidatedBalanceSheet</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>995302 - Statement - Consolidated Balance Sheets (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/ConsolidatedBalanceSheet_Parentheticals</Role>
      <ShortName>Consolidated Balance Sheets (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>995303 - Statement - Consolidated Statements of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/ConsolidatedIncomeStatement</Role>
      <ShortName>Consolidated Statements of Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>995304 - Statement - Consolidated Statements of Comprehensive Income (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/ConsolidatedIncomeStatement_Parentheticals</Role>
      <ShortName>Consolidated Statements of Comprehensive Income (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>995305 - Statement - Consolidated Statements of Shareholders??? Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/ShareholdersEquityType1</Role>
      <ShortName>Consolidated Statements of Shareholders??? Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>995306 - Statement - Consolidated Statements of Shareholders??? Equity (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/ShareholdersEquityType1_Parentheticals</Role>
      <ShortName>Consolidated Statements of Shareholders??? Equity (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>995307 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/ConsolidatedCashFlow</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>995308 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/NatureofOperationsandSummaryofSignificantAccountingPolicies</Role>
      <ShortName>Nature of Operations and Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995309 - Disclosure - Recent Events, Including Mergers and Acquisitions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/RecentEventsIncludingMergersandAcquisitions</Role>
      <ShortName>Recent Events, Including Mergers and Acquisitions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995310 - Disclosure - Earnings per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/EarningsperShare</Role>
      <ShortName>Earnings per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995311 - Disclosure - Debt Securities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/DebtSecurities</Role>
      <ShortName>Debt Securities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995312 - Disclosure - Loans and Allowance for Credit Losses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/LoansandAllowanceforCreditLosses</Role>
      <ShortName>Loans and Allowance for Credit Losses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995313 - Disclosure - Premises and Equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/PremisesandEquipment</Role>
      <ShortName>Premises and Equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995314 - Disclosure - Goodwill and Core Deposit Intangibles</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/GoodwillandCoreDepositIntangibles</Role>
      <ShortName>Goodwill and Core Deposit Intangibles</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995315 - Disclosure - Deposits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/Deposits</Role>
      <ShortName>Deposits</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995316 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995317 - Disclosure - Letters of Credit</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/LettersofCredit</Role>
      <ShortName>Letters of Credit</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995318 - Disclosure - Advances and Borrowings</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/AdvancesandBorrowings</Role>
      <ShortName>Advances and Borrowings</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995319 - Disclosure - Shareholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/ShareholdersEquity</Role>
      <ShortName>Shareholders' Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995320 - Disclosure - Related-Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/RelatedPartyTransactions</Role>
      <ShortName>Related-Party Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995321 - Disclosure - Employee Benefits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/EmployeeBenefits</Role>
      <ShortName>Employee Benefits</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995322 - Disclosure - Disclosures about Fair Value of Assets and Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/DisclosuresaboutFairValueofAssetsandLiabilities</Role>
      <ShortName>Disclosures about Fair Value of Assets and Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995323 - Disclosure - Financial Instruments with Off-Balance Sheet Risk</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/FinancialInstrumentswithOffBalanceSheetRisk</Role>
      <ShortName>Financial Instruments with Off-Balance Sheet Risk</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995324 - Disclosure - Concentrations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/Concentrations</Role>
      <ShortName>Concentrations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995325 - Disclosure - Operating Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/OperatingLeases</Role>
      <ShortName>Operating Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995326 - Disclosure - Parent-only Financial Statements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/ParentonlyFinancialStatements</Role>
      <ShortName>Parent-only Financial Statements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.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>29</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.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>30</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure</Role>
      <ShortName>Cybersecurity Risk Management and Strategy Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>996000 - Disclosure - Accounting Policies, by Policy (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/AccountingPoliciesByPolicy</Role>
      <ShortName>Accounting Policies, by Policy (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://bank7.com/role/NatureofOperationsandSummaryofSignificantAccountingPolicies</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>996001 - Disclosure - Earnings per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/EarningsperShareTables</Role>
      <ShortName>Earnings per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bank7.com/role/EarningsperShare</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>996002 - Disclosure - Debt Securities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/DebtSecuritiesTables</Role>
      <ShortName>Debt Securities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bank7.com/role/DebtSecurities</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>996003 - Disclosure - Loans and Allowance for Credit Losses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/LoansandAllowanceforCreditLossesTables</Role>
      <ShortName>Loans and Allowance for Credit Losses (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bank7.com/role/LoansandAllowanceforCreditLosses</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>996004 - Disclosure - Premises and Equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/PremisesandEquipmentTables</Role>
      <ShortName>Premises and Equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bank7.com/role/PremisesandEquipment</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>996005 - Disclosure - Goodwill and Core Deposit Intangibles (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/GoodwillandCoreDepositIntangiblesTables</Role>
      <ShortName>Goodwill and Core Deposit Intangibles (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bank7.com/role/GoodwillandCoreDepositIntangibles</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>996006 - Disclosure - Deposits (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/DepositsTables</Role>
      <ShortName>Deposits (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bank7.com/role/Deposits</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>996007 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/IncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bank7.com/role/IncomeTaxes</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>996008 - Disclosure - Shareholders' Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/ShareholdersEquityTables</Role>
      <ShortName>Shareholders' Equity (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bank7.com/role/ShareholdersEquity</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>996009 - Disclosure - Related-Party Transactions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/RelatedPartyTransactionsTables</Role>
      <ShortName>Related-Party Transactions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bank7.com/role/RelatedPartyTransactions</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>996010 - Disclosure - Employee Benefits (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/EmployeeBenefitsTables</Role>
      <ShortName>Employee Benefits (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bank7.com/role/EmployeeBenefits</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>996011 - Disclosure - Disclosures about Fair Value of Assets and Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/DisclosuresaboutFairValueofAssetsandLiabilitiesTables</Role>
      <ShortName>Disclosures about Fair Value of Assets and Liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bank7.com/role/DisclosuresaboutFairValueofAssetsandLiabilities</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>996012 - Disclosure - Financial Instruments with Off-Balance Sheet Risk (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/FinancialInstrumentswithOffBalanceSheetRiskTables</Role>
      <ShortName>Financial Instruments with Off-Balance Sheet Risk (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bank7.com/role/FinancialInstrumentswithOffBalanceSheetRisk</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>996013 - Disclosure - Operating Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/OperatingLeasesTables</Role>
      <ShortName>Operating Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bank7.com/role/OperatingLeases</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>996014 - Disclosure - Parent-only Financial Statements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/ParentonlyFinancialStatementsTables</Role>
      <ShortName>Parent-only Financial Statements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bank7.com/role/ParentonlyFinancialStatements</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>996015 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/NatureofOperationsandSummaryofSignificantAccountingPoliciesDetails</Role>
      <ShortName>Nature of Operations and Summary of Significant Accounting Policies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>996016 - Disclosure - Recent Events, Including Mergers and Acquisitions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/RecentEventsIncludingMergersandAcquisitionsDetails</Role>
      <ShortName>Recent Events, Including Mergers and Acquisitions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bank7.com/role/RecentEventsIncludingMergersandAcquisitions</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>996017 - Disclosure - Earnings per Share - Basic and Diluted Earnings Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/BasicandDilutedEarningsPerShareTable</Role>
      <ShortName>Earnings per Share - Basic and Diluted Earnings Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>996018 - Disclosure - Debt Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/DebtSecuritiesDetails</Role>
      <ShortName>Debt Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bank7.com/role/DebtSecuritiesTables</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>996019 - Disclosure - Debt Securities - Amortized Cost and Fair Value of Debt Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/AmortizedCostandFairValueofDebtSecuritiesTable</Role>
      <ShortName>Debt Securities - Amortized Cost and Fair Value of Debt Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>996020 - Disclosure - Debt Securities - Contractual Maturity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/ContractualMaturityTable</Role>
      <ShortName>Debt Securities - Contractual Maturity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>996021 - Disclosure - Debt Securities - Realized Gains and Losses from Sale, Repayment and Call of Debt Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/RealizedGainsandLossesfromSaleRepaymentandCallofDebtSecuritiesTable</Role>
      <ShortName>Debt Securities - Realized Gains and Losses from Sale, Repayment and Call of Debt Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>996022 - Disclosure - Debt Securities - Pledged Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/PledgedSecuritiesTable</Role>
      <ShortName>Debt Securities - Pledged Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>996023 - Disclosure - Debt Securities - Continuous Unrealized Loss Position (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/ContinuousUnrealizedLossPositionTable</Role>
      <ShortName>Debt Securities - Continuous Unrealized Loss Position (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>996024 - Disclosure - Loans and Allowance for Credit Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/LoansandAllowanceforCreditLossesDetails</Role>
      <ShortName>Loans and Allowance for Credit Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bank7.com/role/LoansandAllowanceforCreditLossesTables</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>996025 - Disclosure - Loans and Allowance for Credit Losses - Summary of Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/SummaryofLoansTable</Role>
      <ShortName>Loans and Allowance for Credit Losses - Summary of Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>996026 - Disclosure - Loans and Allowance for Credit Losses - Activity in Allowance for Credit Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/ActivityinAllowanceforCreditLossesTable</Role>
      <ShortName>Loans and Allowance for Credit Losses - Activity in Allowance for Credit Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>996027 - Disclosure - Loans and Allowance for Credit Losses - Loan Portfolio Based on Internal Rating Category (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/LoanPortfolioBasedonInternalRatingCategoryTable</Role>
      <ShortName>Loans and Allowance for Credit Losses - Loan Portfolio Based on Internal Rating Category (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>996028 - Disclosure - Loans and Allowance for Credit Losses - Loan Portfolio Aging Analysis of Recorded Investment in Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/LoanPortfolioAgingAnalysisofRecordedInvestmentinLoansTable</Role>
      <ShortName>Loans and Allowance for Credit Losses - Loan Portfolio Aging Analysis of Recorded Investment in Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>996029 - Disclosure - Loans and Allowance for Credit Losses - Nonaccrual Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/NonaccrualLoansTable</Role>
      <ShortName>Loans and Allowance for Credit Losses - Nonaccrual Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>996030 - Disclosure - Loans and Allowance for Credit Losses - Collateral-Dependent Gross Loans Held for Investment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/CollateralDependentGrossLoansHeldforInvestmentTable</Role>
      <ShortName>Loans and Allowance for Credit Losses - Collateral-Dependent Gross Loans Held for Investment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>996031 - Disclosure - Premises and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/PremisesandEquipmentDetails</Role>
      <ShortName>Premises and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bank7.com/role/PremisesandEquipmentTables</ParentRole>
      <Position>63</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>996032 - Disclosure - Premises and Equipment - Premises and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/PremisesandEquipmentTable</Role>
      <ShortName>Premises and Equipment - Premises and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>996033 - Disclosure - Goodwill and Core Deposit Intangibles (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/GoodwillandCoreDepositIntangiblesDetails</Role>
      <ShortName>Goodwill and Core Deposit Intangibles (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bank7.com/role/GoodwillandCoreDepositIntangiblesTables</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>996034 - Disclosure - Goodwill and Core Deposit Intangibles - Summary of Goodwill and Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/SummaryofGoodwillandIntangibleAssetsTable</Role>
      <ShortName>Goodwill and Core Deposit Intangibles - Summary of Goodwill and Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>996035 - Disclosure - Goodwill and Core Deposit Intangibles - Estimated Amortization Expense for Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/EstimatedAmortizationExpenseforIntangibleAssetsTable</Role>
      <ShortName>Goodwill and Core Deposit Intangibles - Estimated Amortization Expense for Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>996036 - Disclosure - Deposits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/DepositsDetails</Role>
      <ShortName>Deposits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bank7.com/role/DepositsTables</ParentRole>
      <Position>68</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>996037 - Disclosure - Deposits - Scheduled Maturities of Interest-Bearing Time Deposits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/ScheduledMaturitiesofInterestBearingTimeDepositsTable</Role>
      <ShortName>Deposits - Scheduled Maturities of Interest-Bearing Time Deposits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>996038 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/IncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bank7.com/role/IncomeTaxesTables</ParentRole>
      <Position>70</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>996039 - Disclosure - Income Taxes - (Benefit)/Provision for Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/BenefitProvisionforIncomeTaxesTable</Role>
      <ShortName>Income Taxes - (Benefit)/Provision for Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bank7.com/role/IncomeTaxesTables</ParentRole>
      <Position>71</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>996040 - Disclosure - Income Taxes - Provision for Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/ProvisionforIncomeTaxesTable</Role>
      <ShortName>Income Taxes - Provision for Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>996041 - Disclosure - Income Taxes - Income Taxes Paid (Net of Refunds Received) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/IncomeTaxesPaidNetofRefundsReceivedTable</Role>
      <ShortName>Income Taxes - Income Taxes Paid (Net of Refunds Received) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>996042 - Disclosure - Income Taxes - Components of Net Deferred Tax Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/ComponentsofNetDeferredTaxAssetsTable</Role>
      <ShortName>Income Taxes - Components of Net Deferred Tax Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>996043 - Disclosure - Letters of Credit (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/LettersofCreditDetails</Role>
      <ShortName>Letters of Credit (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bank7.com/role/LettersofCredit</ParentRole>
      <Position>75</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>996044 - Disclosure - Advances and Borrowings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/AdvancesandBorrowingsDetails</Role>
      <ShortName>Advances and Borrowings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bank7.com/role/AdvancesandBorrowings</ParentRole>
      <Position>76</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>996045 - Disclosure - Shareholders' Equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/ShareholdersEquityDetails</Role>
      <ShortName>Shareholders' Equity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bank7.com/role/ShareholdersEquityTables</ParentRole>
      <Position>77</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>996046 - Disclosure - Shareholders' Equity - Summary of Activity under Repurchase Plan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/SummaryofActivityunderRepurchasePlanTable</Role>
      <ShortName>Shareholders' Equity - Summary of Activity under Repurchase Plan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>996047 - Disclosure - Shareholders' Equity - Actual Capital Amounts and Ratios (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/ActualCapitalAmountsandRatiosTable</Role>
      <ShortName>Shareholders' Equity - Actual Capital Amounts and Ratios (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>996048 - Disclosure - Related-Party Transactions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/RelatedPartyTransactionsDetails</Role>
      <ShortName>Related-Party Transactions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bank7.com/role/RelatedPartyTransactionsTables</ParentRole>
      <Position>80</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>996049 - Disclosure - Related-Party Transactions - Summary of Related Parties Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/SummaryofRelatedPartiesLoansTable</Role>
      <ShortName>Related-Party Transactions - Summary of Related Parties Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>996050 - Disclosure - Employee Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/EmployeeBenefitsDetails</Role>
      <ShortName>Employee Benefits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bank7.com/role/EmployeeBenefitsTables</ParentRole>
      <Position>82</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>996051 - Disclosure - Employee Benefits - Stock Options Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/StockOptionsActivityTable</Role>
      <ShortName>Employee Benefits - Stock Options Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>996052 - Disclosure - Employee Benefits - Restricted Stock Units (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/RestrictedStockUnitsTable</Role>
      <ShortName>Employee Benefits - Restricted Stock Units (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>996053 - Disclosure - Disclosures about Fair Value of Assets and Liabilities - Assets Measured at Fair Value on Nonrecurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/AssetsMeasuredatFairValueonNonrecurringBasisTable</Role>
      <ShortName>Disclosures about Fair Value of Assets and Liabilities - Assets Measured at Fair Value on Nonrecurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>996054 - Disclosure - Disclosures about Fair Value of Assets and Liabilities - Quantitative Information About Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/QuantitativeInformationAboutUnobservableInputsUsedinRecurringandNonrecurringLevel3FairValueMeasurementsTable</Role>
      <ShortName>Disclosures about Fair Value of Assets and Liabilities - Quantitative Information About Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>996055 - Disclosure - Disclosures about Fair Value of Assets and Liabilities - Estimated Fair Value of Financial Instruments Not Recorded at Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/EstimatedFairValueofFinancialInstrumentsNotRecordedatFairValueTable</Role>
      <ShortName>Disclosures about Fair Value of Assets and Liabilities - Estimated Fair Value of Financial Instruments Not Recorded at Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>996056 - Disclosure - Financial Instruments with Off-Balance Sheet Risk (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/FinancialInstrumentswithOffBalanceSheetRiskDetails</Role>
      <ShortName>Financial Instruments with Off-Balance Sheet Risk (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bank7.com/role/FinancialInstrumentswithOffBalanceSheetRiskTables</ParentRole>
      <Position>88</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>996057 - Disclosure - Financial Instruments with Off-Balance Sheet Risk - Financial Instruments with Contract Amounts Representing Credit Risk (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/FinancialInstrumentswithContractAmountsRepresentingCreditRiskTable</Role>
      <ShortName>Financial Instruments with Off-Balance Sheet Risk - Financial Instruments with Contract Amounts Representing Credit Risk (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>996058 - Disclosure - Concentrations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/ConcentrationsDetails</Role>
      <ShortName>Concentrations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bank7.com/role/Concentrations</ParentRole>
      <Position>90</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>996059 - Disclosure - Operating Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/OperatingLeasesDetails</Role>
      <ShortName>Operating Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bank7.com/role/OperatingLeasesTables</ParentRole>
      <Position>91</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>996060 - Disclosure - Operating Leases - Rental Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/RentalExpenseTable</Role>
      <ShortName>Operating Leases - Rental Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>996061 - Disclosure - Operating Leases - Future Minimum Rental Commitments Due under Non-Cancelable Operating Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/FutureMinimumRentalCommitmentsDueunderNonCancelableOperatingLeasesTable</Role>
      <ShortName>Operating Leases - Future Minimum Rental Commitments Due under Non-Cancelable Operating Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>996062 - Disclosure - Parent-only Financial Statements - Balance Sheets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/BalanceSheetsTable</Role>
      <ShortName>Parent-only Financial Statements - Balance Sheets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>996063 - Disclosure - Parent-only Financial Statements - Statements of Comprehensive Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/StatementsofComprehensiveIncomeTable</Role>
      <ShortName>Parent-only Financial Statements - Statements of Comprehensive Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="ef20060654_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>996064 - Disclosure - Parent-only Financial Statements - Statements of Cash Flows (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bank7.com/role/StatementsofCashFlowsTable</Role>
      <ShortName>Parent-only Financial Statements - Statements of Cash Flows (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>bsvn-20251231.xsd</File>
    <File>bsvn-20251231_cal.xml</File>
    <File>bsvn-20251231_def.xml</File>
    <File>bsvn-20251231_lab.xml</File>
    <File>bsvn-20251231_pre.xml</File>
    <File doctype="10-K" isDefinitelyFs="true" isUsgaap="true" original="ef20060654_10k.htm">ef20060654_10k.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="4">http://fasb.org/srt/2025</BaseTaxonomy>
    <BaseTaxonomy items="2128">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="15">http://xbrl.sec.gov/cyd/2025</BaseTaxonomy>
    <BaseTaxonomy items="38">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>
