<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.22.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>378</ContextCount>
  <ElementCount>419</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>76</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>4</UnitCount>
  <MyReports>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>100000 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>100010 - Statement - Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_StatementBalanceSheets</Role>
      <ShortName>Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>100020 - Statement - Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_StatementBalanceSheetsParenthetical</Role>
      <ShortName>Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>100030 - Statement - Statements of Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_StatementStatementsOfIncome</Role>
      <ShortName>Statements of Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>100040 - Statement - Statements of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_StatementStatementsOfComprehensiveIncome</Role>
      <ShortName>Statements of Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>100050 - Statement - Statements of Comprehensive Income (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_StatementStatementsOfComprehensiveIncomeParenthetical</Role>
      <ShortName>Statements of Comprehensive Income (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>100060 - Statement - Consolidated Statements Of Changes In Shareholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/StatementConsolidatedStatementsOfChangesInShareholdersEquity</Role>
      <ShortName>Consolidated Statements Of Changes In Shareholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>100070 - Statement - Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_StatementStatementsOfCashFlows</Role>
      <ShortName>Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>100080 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>100090 - Disclosure - Investment Securities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureInvestmentSecurities</Role>
      <ShortName>Investment Securities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>100100 - Disclosure - Loans and Allowance for Loan Losses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureLoansAndAllowanceForLoanLosses</Role>
      <ShortName>Loans and Allowance for Loan Losses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>100110 - Disclosure - Premises and Equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosurePremisesAndEquipment</Role>
      <ShortName>Premises and Equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>100120 - Disclosure - Certificates of Deposit</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureCertificatesOfDeposit</Role>
      <ShortName>Certificates of Deposit</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>100130 - Disclosure - Federal Home Loan Bank Advances and Other Borrowings</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureFederalHomeLoanBankAdvancesAndOtherBorrowings</Role>
      <ShortName>Federal Home Loan Bank Advances and Other Borrowings</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>100140 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureIncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>100150 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureCommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>100160 - Disclosure - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureRelatedPartyTransactions</Role>
      <ShortName>Related Party Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>100170 - Disclosure - Regulatory Matters</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureRegulatoryMatters</Role>
      <ShortName>Regulatory Matters</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>100180 - Disclosure - Employee Benefit Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureEmployeeBenefitPlans</Role>
      <ShortName>Employee Benefit Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>100190 - Disclosure - Fair Value Measurement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureFairValueMeasurement</Role>
      <ShortName>Fair Value Measurement</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>100200 - Disclosure - Change In Corporate Form</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureChangeInCorporateForm</Role>
      <ShortName>Change In Corporate Form</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>100210 - Disclosure - Condensed Financial Statements of Parent Company</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureCondensedFinancialStatementsOfParentCompany1</Role>
      <ShortName>Condensed Financial Statements of Parent Company</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>100220 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>100230 - Disclosure - Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesTables</Role>
      <ShortName>Summary of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>100240 - Disclosure - Investment Securities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureInvestmentSecuritiesTables</Role>
      <ShortName>Investment Securities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureInvestmentSecurities</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>100250 - Disclosure - Loans and Allowance for Loan Losses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureLoansAndAllowanceForLoanLossesTables</Role>
      <ShortName>Loans and Allowance for Loan Losses (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureLoansAndAllowanceForLoanLosses</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>100260 - Disclosure - Premises and Equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosurePremisesAndEquipmentTables</Role>
      <ShortName>Premises and Equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosurePremisesAndEquipment</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>100270 - Disclosure - Certificates of Deposit (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureCertificatesOfDepositTables</Role>
      <ShortName>Certificates of Deposit (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureCertificatesOfDeposit</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>100280 - Disclosure - Federal Home Loan Bank Advances and Other Borrowings (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureFederalHomeLoanBankAdvancesAndOtherBorrowingsTables</Role>
      <ShortName>Federal Home Loan Bank Advances and Other Borrowings (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureFederalHomeLoanBankAdvancesAndOtherBorrowings</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>100290 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureIncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureIncomeTaxes</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>100300 - Disclosure - Commitments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureCommitmentsTables</Role>
      <ShortName>Commitments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureCommitmentsAndContingencies</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>100310 - Disclosure - Related Party Transactions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureRelatedPartyTransactionsTables</Role>
      <ShortName>Related Party Transactions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureRelatedPartyTransactions</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>100320 - Disclosure - Regulatory Matters (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureRegulatoryMattersTables</Role>
      <ShortName>Regulatory Matters (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureRegulatoryMatters</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>100330 - Disclosure - Employee Benefit Plans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansTables</Role>
      <ShortName>Employee Benefit Plans (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureEmployeeBenefitPlans</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>100340 - Disclosure - Fair Value Measurement (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureFairValueMeasurementTables</Role>
      <ShortName>Fair Value Measurement (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureFairValueMeasurement</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>100350 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetail</Role>
      <ShortName>Summary of Significant Accounting Policies - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>100360 - Disclosure - Summary of Significant Accounting Policies - Schedule of Range of Estimated Useful Lives for Premises and Equipment (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfRangeOfEstimatedUsefulLivesForPremisesAndEquipmentDetail</Role>
      <ShortName>Summary of Significant Accounting Policies - Schedule of Range of Estimated Useful Lives for Premises and Equipment (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>100370 - Disclosure - Investment Securities - Summary Of Investments Securities Available For Sale (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureInvestmentSecuritiesSummaryOfInvestmentsSecuritiesAvailableForSaleDetail</Role>
      <ShortName>Investment Securities - Summary Of Investments Securities Available For Sale (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>100380 - Disclosure - Investment Securities - Summary Of Unrealized Losses and Estimated Fair Value (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureInvestmentSecuritiesSummaryOfUnrealizedLossesAndEstimatedFairValueDetail</Role>
      <ShortName>Investment Securities - Summary Of Unrealized Losses and Estimated Fair Value (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>100390 - Disclosure - Investment Securities - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureInvestmentSecuritiesAdditionalInformationDetail</Role>
      <ShortName>Investment Securities - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>100400 - Disclosure - Investment Securities - Summary Of Amortized Cost and Estimated Fair Value Of Investment Securities Available For Sale (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureInvestmentSecuritiesSummaryOfAmortizedCostAndEstimatedFairValueOfInvestmentSecuritiesAvailableForSaleDetail</Role>
      <ShortName>Investment Securities - Summary Of Amortized Cost and Estimated Fair Value Of Investment Securities Available For Sale (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>100410 - Disclosure - Loans and Allowance for Loan Losses - Summary Of Major Classifications Of Loans, By Purpose Code - (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureLoansAndAllowanceForLoanLossesSummaryOfMajorClassificationsOfLoansByPurposeCodeDetail</Role>
      <ShortName>Loans and Allowance for Loan Losses - Summary Of Major Classifications Of Loans, By Purpose Code - (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>100420 - Disclosure - Loans and Allowance for Loan Losses - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetail</Role>
      <ShortName>Loans and Allowance for Loan Losses - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>100430 - Disclosure - Loans and Allowance for Loan Losses - Summary Of Allowance For Loan Losses - (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureLoansAndAllowanceForLoanLossesSummaryOfAllowanceForLoanLossesDetail</Role>
      <ShortName>Loans and Allowance for Loan Losses - Summary Of Allowance For Loan Losses - (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>100440 - Disclosure - Loans and Allowance for Loan Losses - Summary Of Allowances For Loan Losses And Recorded Investments In Loans Individually And Collectively Evaluated For Impairment (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureLoansAndAllowanceForLoanLossesSummaryOfAllowancesForLoanLossesAndRecordedInvestmentsInLoansIndividuallyAndCollectivelyEvaluatedForImpairmentDetail</Role>
      <ShortName>Loans and Allowance for Loan Losses - Summary Of Allowances For Loan Losses And Recorded Investments In Loans Individually And Collectively Evaluated For Impairment (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>100450 - Disclosure - Loans and Allowance for Loan Losses - Summary Of Impaired Loans With And Without Allowances For Credit Losses Recorded Investment Unpaid Principal Amount (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureLoansAndAllowanceForLoanLossesSummaryOfImpairedLoansWithAndWithoutAllowancesForCreditLossesRecordedInvestmentUnpaidPrincipalAmountDetail</Role>
      <ShortName>Loans and Allowance for Loan Losses - Summary Of Impaired Loans With And Without Allowances For Credit Losses Recorded Investment Unpaid Principal Amount (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>100460 - Disclosure - Loans and Allowance for Loan Losses - Summary of Impaired loans (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesSummaryOfImpairedLoansDetail</Role>
      <ShortName>Loans and Allowance for Loan Losses - Summary of Impaired loans (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>100470 - Disclosure - Loans and Allowance for Loan Losses - Schedule of Aging of the Recorded Investment in Past Due Loans and Nonaccrual Loans (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureLoansAndAllowanceForLoanLossesScheduleOfAgingOfRecordedInvestmentInPastDueLoansAndNonaccrualLoansDetail</Role>
      <ShortName>Loans and Allowance for Loan Losses - Schedule of Aging of the Recorded Investment in Past Due Loans and Nonaccrual Loans (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>100480 - Disclosure - Loan And Allowance for Loan losses - Summary of Credit Exposure Based on Risk Ratings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureLoanAndAllowanceForLoanLossesSummaryOfCreditExposureBasedOnRiskRatingsDetails</Role>
      <ShortName>Loan And Allowance for Loan losses - Summary of Credit Exposure Based on Risk Ratings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>100490 - Disclosure - Premises and Equipment - Summary of Major Classification of Premises and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosurePremisesAndEquipmentSummaryOfMajorClassificationOfPremisesAndEquipmentDetails</Role>
      <ShortName>Premises and Equipment - Summary of Major Classification of Premises and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>100500 - Disclosure - Premises and Equipment - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosurePremisesAndEquipmentAdditionalInformationDetails</Role>
      <ShortName>Premises and Equipment - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>100510 - Disclosure - Certificates of Deposit - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureCertificatesOfDepositAdditionalInformationDetail</Role>
      <ShortName>Certificates of Deposit - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>100520 - Disclosure - Certificates of Deposit - Schedule of Maturities of Certificates of Deposit (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureCertificatesOfDepositScheduleOfMaturitiesOfCertificatesOfDepositDetail</Role>
      <ShortName>Certificates of Deposit - Schedule of Maturities of Certificates of Deposit (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>100530 - Disclosure - Federal Home Loan Bank Advances and Other Borrowings - Summary of Advances from the FHLB were Outstanding (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureFederalHomeLoanBankAdvancesAndOtherBorrowingsSummaryOfAdvancesFromFHLBWereOutstandingDetail</Role>
      <ShortName>Federal Home Loan Bank Advances and Other Borrowings - Summary of Advances from the FHLB were Outstanding (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>100540 - Disclosure - Federal Home Loan Bank Advances and Other Borrowings - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureFederalHomeLoanBankAdvancesAndOtherBorrowingsAdditionalInformationDetail</Role>
      <ShortName>Federal Home Loan Bank Advances and Other Borrowings - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>100550 - Disclosure - Income Taxes - Schedule of Income Tax Expense (Benefit) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfIncomeTaxExpenseBenefitDetail</Role>
      <ShortName>Income Taxes - Schedule of Income Tax Expense (Benefit) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>100560 - Disclosure - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfEffectiveIncomeTaxRateReconciliationDetail</Role>
      <ShortName>Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>100570 - Disclosure - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetail</Role>
      <ShortName>Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>100580 - Disclosure - Income Taxes - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetail</Role>
      <ShortName>Income Taxes - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>100590 - Disclosure - Commitments - Schedule of Loan Commitments Representing Off-Balance Sheet Risk (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfLoanCommitmentsRepresentingOffbalanceSheetRiskDetail</Role>
      <ShortName>Commitments - Schedule of Loan Commitments Representing Off-Balance Sheet Risk (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>100600 - Disclosure - Related Party Transactions - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureRelatedPartyTransactionsAdditionalInformationDetail</Role>
      <ShortName>Related Party Transactions - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>100610 - Disclosure - Related Party Transactions - Summary of Related Party Loan Activity (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureRelatedPartyTransactionsSummaryOfRelatedPartyLoanActivityDetail</Role>
      <ShortName>Related Party Transactions - Summary of Related Party Loan Activity (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>100620 - Disclosure - Regulatory Matters - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureRegulatoryMattersAdditionalInformationDetail</Role>
      <ShortName>Regulatory Matters - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>100630 - Disclosure - Regulatory Matters - Schedule of Actual and Required Capital Amounts and Ratios of the Bank (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureRegulatoryMattersScheduleOfActualAndRequiredCapitalAmountsAndRatiosOfBankDetail</Role>
      <ShortName>Regulatory Matters - Schedule of Actual and Required Capital Amounts and Ratios of the Bank (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>100640 - Disclosure - Employee Benefit Plans - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureEmployeeBenefitPlansAdditionalInformationDetail</Role>
      <ShortName>Employee Benefit Plans - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>100650 - Disclosure - Employee Benefit Plans - Summary of the Components of the Net Periodic Post-Retirement Benefit Cost (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureEmployeeBenefitPlansSummaryOfTheComponentsOfTheNetPeriodicPostretirementBenefitCostDetail</Role>
      <ShortName>Employee Benefit Plans - Summary of the Components of the Net Periodic Post-Retirement Benefit Cost (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>100660 - Disclosure - Employee Benefit Plans - Schedule of Estimated Benefit Payments (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureEmployeeBenefitPlansScheduleOfEstimatedBenefitPaymentsDetail</Role>
      <ShortName>Employee Benefit Plans - Schedule of Estimated Benefit Payments (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>100670 - Disclosure - Employee Benefit Plans - Reconciliation of the Accumulated Post-Retirement Benefit Obligation (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureEmployeeBenefitPlansReconciliationOfTheAccumulatedPostretirementBenefitObligationDetail</Role>
      <ShortName>Employee Benefit Plans - Reconciliation of the Accumulated Post-Retirement Benefit Obligation (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>100680 - Disclosure - Employee Benefit Plans - Summary of the Change in Plan Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureEmployeeBenefitPlansSummaryOfTheChangeInPlanAssetsDetail</Role>
      <ShortName>Employee Benefit Plans - Summary of the Change in Plan Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>100690 - Disclosure - Employee Benefit Plans - Schedule of Fair Values of the Bank's Pension Plan Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureEmployeeBenefitPlansScheduleOfFairValuesOfTheBanksPensionPlanAssetsDetail</Role>
      <ShortName>Employee Benefit Plans - Schedule of Fair Values of the Bank's Pension Plan Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>100700 - Disclosure - Employee Benefit Plans - Summary of the Amount Recognized in Other Liabilities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureEmployeeBenefitPlansSummaryOfTheAmountRecognizedInOtherLiabilitiesDetail</Role>
      <ShortName>Employee Benefit Plans - Summary of the Amount Recognized in Other Liabilities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>100710 - Disclosure - Employee Benefit Plans - Schedule of Accumulated Other Comprehensive Loss, Net of Tax (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureEmployeeBenefitPlansScheduleOfAccumulatedOtherComprehensiveLossNetOfTaxDetail</Role>
      <ShortName>Employee Benefit Plans - Schedule of Accumulated Other Comprehensive Loss, Net of Tax (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>100720 - Disclosure - Employee Benefit Plans - Schedule of Accumulated Post-Retirement Benefit Obligation and Other Comprehensive Income (loss) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureEmployeeBenefitPlansScheduleOfAccumulatedPostretirementBenefitObligationAndOtherComprehensiveIncomeLossDetail</Role>
      <ShortName>Employee Benefit Plans - Schedule of Accumulated Post-Retirement Benefit Obligation and Other Comprehensive Income (loss) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>100730 - Disclosure - Employee Benefit Plans - Employee Stock Ownership Plan (ESOP) Disclosures (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureEmployeeBenefitPlansEmployeeStockOwnershipPlanEsopDisclosuresDetail</Role>
      <ShortName>Employee Benefit Plans - Employee Stock Ownership Plan (ESOP) Disclosures (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>100740 - Disclosure - Fair Value Measurement - Summary of Assets Recorded at Fair Value on a Recurring Basis (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureFairValueMeasurementSummaryOfAssetsRecordedAtFairValueOnRecurringBasisDetail</Role>
      <ShortName>Fair Value Measurement - Summary of Assets Recorded at Fair Value on a Recurring Basis (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>100750 - Disclosure - Fair Value Measurement - Summary of Assets Recorded at Fair Value on a Nonrecurring Basis (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureFairValueMeasurementSummaryOfAssetsRecordedAtFairValueOnNonrecurringBasisDetail</Role>
      <ShortName>Fair Value Measurement - Summary of Assets Recorded at Fair Value on a Nonrecurring Basis (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>100760 - Disclosure - Fair Value Measurement - Summary of Carrying Amounts and Estimated Fair Values of the Bank's Financial Instruments (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureFairValueMeasurementSummaryOfCarryingAmountsAndEstimatedFairValuesOfBankSFinancialInstrumentsDetail</Role>
      <ShortName>Fair Value Measurement - Summary of Carrying Amounts and Estimated Fair Values of the Bank's Financial Instruments (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>100770 - Disclosure - Change in Corporate Form - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/Role_DisclosureChangeInCorporateFormAdditionalInformationDetail</Role>
      <ShortName>Change in Corporate Form - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>100780 - Disclosure - Condensed Financial Statements of Parent Company - Condensed Balance Sheets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureCondensedFinancialStatementsOfParentCompanyCondensedBalanceSheetsDetail</Role>
      <ShortName>Condensed Financial Statements of Parent Company - Condensed Balance Sheets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>100790 - Disclosure - Condensed Financial Statements of Parent Company - Condensed Statements of Income (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureCondensedFinancialStatementsOfParentCompanyCondensedStatementsOfIncomeDetail</Role>
      <ShortName>Condensed Financial Statements of Parent Company - Condensed Statements of Income (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="tcbc-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>100800 - Disclosure - Condensed Financial Statements of Parent Company - Condensed Statements of Cash Flow (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tcfederal.com/20211231/taxonomy/role/DisclosureCondensedFinancialStatementsOfParentCompanyCondensedStatementsOfCashFlowDetail</Role>
      <ShortName>Condensed Financial Statements of Parent Company - Condensed Statements of Cash Flow (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</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-K" original="tcbc-20211231.htm">tcbc-20211231.htm</File>
    <File>tcbc-20211231.xsd</File>
    <File>tcbc-20211231_cal.xml</File>
    <File>tcbc-20211231_def.xml</File>
    <File>tcbc-20211231_lab.xml</File>
    <File>tcbc-20211231_pre.xml</File>
    <File>tcbc-ex10_5.htm</File>
    <File>tcbc-ex10_8.htm</File>
    <File>tcbc-ex10_9.htm</File>
    <File>tcbc-ex21.htm</File>
    <File>tcbc-ex31_1.htm</File>
    <File>tcbc-ex31_2.htm</File>
    <File>tcbc-ex32.htm</File>
    <File>tcbc-ex4_2.htm</File>
  </InputFiles>
  <SupplementalFiles>
    <File>img38685945_0.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="1">http://fasb.org/srt/2021-01-31</BaseTaxonomy>
    <BaseTaxonomy items="1231">http://fasb.org/us-gaap/2021-01-31</BaseTaxonomy>
    <BaseTaxonomy items="38">http://xbrl.sec.gov/dei/2021q4</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
