<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.25.3</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>701</ContextCount>
  <ElementCount>319</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>125</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>4</UnitCount>
  <MyReports>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/DocumentandEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>9952151 - Statement - Consolidated Statements of Financial Position (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/ConsolidatedStatementsofFinancialPositionUnaudited</Role>
      <ShortName>Consolidated Statements of Financial Position (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952152 - Statement - Consolidated Statements of Comprehensive Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/ConsolidatedStatementsofComprehensiveIncomeUnaudited</Role>
      <ShortName>Consolidated Statements of Comprehensive Income (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952153 - Statement - Consolidated Statements of Stockholder's Equity Statement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/ConsolidatedStatementsofStockholdersEquityStatement</Role>
      <ShortName>Consolidated Statements of Stockholder's Equity Statement</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952154 - Statement - Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/ConsolidatedStatementsofCashFlowsUnaudited</Role>
      <ShortName>Consolidated Statements of Cash Flows (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952155 - Statement - Supplemental Disclosure of Noncash Investing and Financing Activities Statement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/SupplementalDisclosureofNoncashInvestingandFinancingActivitiesStatement</Role>
      <ShortName>Supplemental Disclosure of Noncash Investing and Financing Activities Statement</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952156 - Statement - Consolidated Statements of Financial Position (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/ConsolidatedStatementsofFinancialPositionParenthetical</Role>
      <ShortName>Consolidated Statements of Financial Position (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952157 - Disclosure - Financial Statements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/FinancialStatements</Role>
      <ShortName>Financial Statements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952158 - Disclosure - Accounting Pronouncements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/AccountingPronouncements</Role>
      <ShortName>Accounting Pronouncements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952159 - Disclosure - Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/Investments</Role>
      <ShortName>Investments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952160 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/FairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952161 - Disclosure - Deferred Policy Acquisition Costs and Cost of Insurance Acquired</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/DeferredPolicyAcquisitionCostsandCostofInsuranceAcquired</Role>
      <ShortName>Deferred Policy Acquisition Costs and Cost of Insurance Acquired</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952162 - Disclosure - Policyholders' Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/PolicyholdersLiabilities</Role>
      <ShortName>Policyholders' Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952163 - Disclosure - Reinsurance</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/Reinsurance</Role>
      <ShortName>Reinsurance</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952164 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/CommitmentsandContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952165 - Disclosure - Stockholders' Equity and Restrictions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/StockholdersEquityandRestrictions</Role>
      <ShortName>Stockholders' Equity and Restrictions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952166 - Disclosure - Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/SegmentInformation</Role>
      <ShortName>Segment Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9952167 - Disclosure - Income Tax</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/IncomeTax</Role>
      <ShortName>Income Tax</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9952168 - Disclosure - Other Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/OtherComprehensiveIncome</Role>
      <ShortName>Other Comprehensive Income</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9952169 - Disclosure - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/RelatedPartyTransactions</Role>
      <ShortName>Related Party Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9952170 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/SubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.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>22</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - Financial Statements (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/FinancialStatementsPolicies</Role>
      <ShortName>Financial Statements (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.citizensinc.com/role/AccountingPronouncements</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9955512 - Disclosure - Investments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/InvestmentsTables</Role>
      <ShortName>Investments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.citizensinc.com/role/Investments</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9955513 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/FairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.citizensinc.com/role/FairValueMeasurements</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9955514 - Disclosure - Deferred Policy Acquisition Costs and Cost of Insurance Acquired (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/DeferredPolicyAcquisitionCostsandCostofInsuranceAcquiredTables</Role>
      <ShortName>Deferred Policy Acquisition Costs and Cost of Insurance Acquired (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.citizensinc.com/role/DeferredPolicyAcquisitionCostsandCostofInsuranceAcquired</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9955515 - Disclosure - Policyholders' Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/PolicyholdersLiabilitiesTables</Role>
      <ShortName>Policyholders' Liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.citizensinc.com/role/PolicyholdersLiabilities</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - Reinsurance (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/ReinsuranceTables</Role>
      <ShortName>Reinsurance (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.citizensinc.com/role/Reinsurance</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9955517 - Disclosure - Stock and Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/StockandEarningsPerShareTables</Role>
      <ShortName>Stock and Earnings Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - Segment Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/SegmentInformationTables</Role>
      <ShortName>Segment Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.citizensinc.com/role/SegmentInformation</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9955519 - Disclosure - Other Comprehensive Income (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/OtherComprehensiveIncomeTables</Role>
      <ShortName>Other Comprehensive Income (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.citizensinc.com/role/OtherComprehensiveIncome</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - Investments (Cash, Cash Equivalents and Investments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/InvestmentsCashCashEquivalentsandInvestmentsDetails</Role>
      <ShortName>Investments (Cash, Cash Equivalents and Investments) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.citizensinc.com/role/InvestmentsTables</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9955522 - Disclosure - Investments (Investment Gains and Losses) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/InvestmentsInvestmentGainsandLossesDetails</Role>
      <ShortName>Investments (Investment Gains and Losses) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.citizensinc.com/role/InvestmentsTables</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - Investments (Equity Securities) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/InvestmentsEquitySecuritiesDetails</Role>
      <ShortName>Investments (Equity Securities) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.citizensinc.com/role/InvestmentsTables</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9955524 - Disclosure - Investments, Debt and Equity Securities in-text (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/InvestmentsDebtandEquitySecuritiesintextDetails</Role>
      <ShortName>Investments, Debt and Equity Securities in-text (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - Investments (Unrealized Losses) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/InvestmentsUnrealizedLossesDetails</Role>
      <ShortName>Investments (Unrealized Losses) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.citizensinc.com/role/InvestmentsTables</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - Investments (Maturity Distribution) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/InvestmentsMaturityDistributionDetails</Role>
      <ShortName>Investments (Maturity Distribution) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.citizensinc.com/role/InvestmentsTables</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9955527 - Disclosure - Investments (Realized Gains (Losses)) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/InvestmentsRealizedGainsLossesDetails</Role>
      <ShortName>Investments (Realized Gains (Losses)) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.citizensinc.com/role/InvestmentsTables</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9955528 - Disclosure - Fair Value Measurements - Financial Instruments Carried at Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/FairValueMeasurementsFinancialInstrumentsCarriedatFairValueDetails</Role>
      <ShortName>Fair Value Measurements - Financial Instruments Carried at Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9955529 - Disclosure - Fair Value Measurements - Structured Note (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/FairValueMeasurementsStructuredNoteDetails</Role>
      <ShortName>Fair Value Measurements - Structured Note (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9955530 - Disclosure - Fair Value Measurements - Ltd Partnerships Gain (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/FairValueMeasurementsLtdPartnershipsGainLossDetails</Role>
      <ShortName>Fair Value Measurements - Ltd Partnerships Gain (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9955531 - Disclosure - Fair Value Measurements - Ltd Partnerships (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/FairValueMeasurementsLtdPartnershipsDetails</Role>
      <ShortName>Fair Value Measurements - Ltd Partnerships (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9955532 - Disclosure - Fair Value Measurements - Financial Instruments not Carried at Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/FairValueMeasurementsFinancialInstrumentsnotCarriedatFairValueDetails</Role>
      <ShortName>Fair Value Measurements - Financial Instruments not Carried at Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9955533 - Disclosure - Fair Value Measurements - Other Long-Term Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/FairValueMeasurementsOtherLongTermInvestmentsDetails</Role>
      <ShortName>Fair Value Measurements - Other Long-Term Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9955534 - Disclosure - Deferred Policy Acquisition Costs and Cost of Insurance Acquired - Schedule of DAC (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/DeferredPolicyAcquisitionCostsandCostofInsuranceAcquiredScheduleofDACDetails</Role>
      <ShortName>Deferred Policy Acquisition Costs and Cost of Insurance Acquired - Schedule of DAC (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9955535 - Disclosure - Deferred Policy Acquisition Costs and Cost of Insurance Acquired - Schedule of COIA (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/DeferredPolicyAcquisitionCostsandCostofInsuranceAcquiredScheduleofCOIADetails</Role>
      <ShortName>Deferred Policy Acquisition Costs and Cost of Insurance Acquired - Schedule of COIA (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9955536 - Disclosure - Policyholders' Liabilities - Schedule of Liability for Future Policy Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/PolicyholdersLiabilitiesScheduleofLiabilityforFuturePolicyBenefitsDetails</Role>
      <ShortName>Policyholders' Liabilities - Schedule of Liability for Future Policy Benefits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9955537 - Disclosure - Policyholders' Liabilities - Reconciliation to Liability for Future policy Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/PolicyholdersLiabilitiesReconciliationtoLiabilityforFuturepolicyBenefitsDetails</Role>
      <ShortName>Policyholders' Liabilities - Reconciliation to Liability for Future policy Benefits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9955538 - Disclosure - Policyholders' Liabilities - Liability for Future Policy Benefit, Discounted Undiscounted Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/PolicyholdersLiabilitiesLiabilityforFuturePolicyBenefitDiscountedUndiscountedActivityDetails</Role>
      <ShortName>Policyholders' Liabilities - Liability for Future Policy Benefit, Discounted Undiscounted Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9955539 - Disclosure - Policyholders' Liabilities - Liability for Future Policy Benefits, Revenue and Interest Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/PolicyholdersLiabilitiesLiabilityforFuturePolicyBenefitsRevenueandInterestExpenseDetails</Role>
      <ShortName>Policyholders' Liabilities - Liability for Future Policy Benefits, Revenue and Interest Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9955540 - Disclosure - Policyholders' Liabilities - Liabilities for Future Policy Benefits, Weighted Average (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/PolicyholdersLiabilitiesLiabilitiesforFuturePolicyBenefitsWeightedAverageDetails</Role>
      <ShortName>Policyholders' Liabilities - Liabilities for Future Policy Benefits, Weighted Average (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9955541 - Disclosure - Policyholders' Liabilities - Guaranteed Minimum Crediting Rate (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/PolicyholdersLiabilitiesGuaranteedMinimumCreditingRateDetails</Role>
      <ShortName>Policyholders' Liabilities - Guaranteed Minimum Crediting Rate (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9955542 - Disclosure - Policyholders' Liabilities - Policyholder Account Balance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/PolicyholdersLiabilitiesPolicyholderAccountBalanceDetails</Role>
      <ShortName>Policyholders' Liabilities - Policyholder Account Balance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9955543 - Disclosure - Policyholders' Liabilities - Policyholders' Account Balance Reconciliation to Policyholders' Account Balances' Liability (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/PolicyholdersLiabilitiesPolicyholdersAccountBalanceReconciliationtoPolicyholdersAccountBalancesLiabilityDetails</Role>
      <ShortName>Policyholders' Liabilities - Policyholders' Account Balance Reconciliation to Policyholders' Account Balances' Liability (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9955544 - Disclosure - Reinsurance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/ReinsuranceDetails</Role>
      <ShortName>Reinsurance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.citizensinc.com/role/ReinsuranceTables</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9955545 - Disclosure - Reinsurance Inforce (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/ReinsuranceInforceDetails</Role>
      <ShortName>Reinsurance Inforce (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9955546 - Disclosure - Reinsurance - By Duration (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/ReinsuranceByDurationDetails</Role>
      <ShortName>Reinsurance - By Duration (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9955547 - Disclosure - Commitments and Contingencies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/CommitmentsandContingenciesDetails</Role>
      <ShortName>Commitments and Contingencies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.citizensinc.com/role/CommitmentsandContingencies</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9955548 - Disclosure - Stockholders' Equity and Restrictions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/StockholdersEquityandRestrictionsDetails</Role>
      <ShortName>Stockholders' Equity and Restrictions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.citizensinc.com/role/StockholdersEquityandRestrictions</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9955549 - Disclosure - Stockholders' Equity and Restrictions - Changes in Stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/StockholdersEquityandRestrictionsChangesinStockDetails</Role>
      <ShortName>Stockholders' Equity and Restrictions - Changes in Stock (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9955550 - Disclosure - Stockholders' Equity and Restrictions - Earnings Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/StockholdersEquityandRestrictionsEarningsPerShareDetails</Role>
      <ShortName>Stockholders' Equity and Restrictions - Earnings Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9955551 - Disclosure - Stockholders' Equity and Restrictions - Capital and Surplus (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/StockholdersEquityandRestrictionsCapitalandSurplusDetails</Role>
      <ShortName>Stockholders' Equity and Restrictions - Capital and Surplus (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9955552 - Disclosure - Segment Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/SegmentInformationDetails</Role>
      <ShortName>Segment Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.citizensinc.com/role/SegmentInformationTables</ParentRole>
      <Position>63</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9955553 - Disclosure - Segment Information Operating Premium Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/SegmentInformationOperatingPremiumInformationDetails</Role>
      <ShortName>Segment Information Operating Premium Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9955554 - Disclosure - Segment and Other Operating Information on Balance Sheet (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/SegmentandOtherOperatingInformationonBalanceSheetDetails</Role>
      <ShortName>Segment and Other Operating Information on Balance Sheet (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9955555 - Disclosure - Segment and Other Operating Information by Geographical Location (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/SegmentandOtherOperatingInformationbyGeographicalLocationDetails</Role>
      <ShortName>Segment and Other Operating Information by Geographical Location (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9955556 - Disclosure - Income Taxes (Current) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/IncomeTaxesCurrentDetails</Role>
      <ShortName>Income Taxes (Current) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.citizensinc.com/role/IncomeTax</ParentRole>
      <Position>67</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9955557 - Disclosure - Other Comprehensive Income - Tax Details (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/OtherComprehensiveIncomeTaxDetailsDetails</Role>
      <ShortName>Other Comprehensive Income - Tax Details (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="cia-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9955558 - Disclosure - Other Comprehensive Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.citizensinc.com/role/OtherComprehensiveIncomeDetails</Role>
      <ShortName>Other Comprehensive Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.citizensinc.com/role/OtherComprehensiveIncomeTables</ParentRole>
      <Position>69</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="cia-20250930.htm">cia-20250930.htm</File>
    <File>cia-20250930.xsd</File>
    <File>cia-20250930_cal.xml</File>
    <File>cia-20250930_def.xml</File>
    <File>cia-20250930_lab.xml</File>
    <File>cia-20250930_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>cia-20250930_g1.jpg</File>
    <File>cia-20250930_g10.jpg</File>
    <File>cia-20250930_g11.jpg</File>
    <File>cia-20250930_g12.jpg</File>
    <File>cia-20250930_g13.jpg</File>
    <File>cia-20250930_g2.jpg</File>
    <File>cia-20250930_g3.jpg</File>
    <File>cia-20250930_g4.jpg</File>
    <File>cia-20250930_g5.jpg</File>
    <File>cia-20250930_g6.jpg</File>
    <File>cia-20250930_g7.jpg</File>
    <File>cia-20250930_g8.jpg</File>
    <File>cia-20250930_g9.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="12">http://fasb.org/srt/2025</BaseTaxonomy>
    <BaseTaxonomy items="2412">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="29">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="5">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
