<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.24.2.u1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>757</ContextCount>
  <ElementCount>514</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>152</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>10</UnitCount>
  <MyReports>
    <Report instance="sf-20240630.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.stifel.com/20240630/taxonomy/role/Role_DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>100010 - Statement - Consolidated Statements Of Financial Condition</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_StatementConsolidatedStatementsOfFinancialCondition</Role>
      <ShortName>Consolidated Statements Of Financial Condition</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>100030 - Statement - Consolidated Statements Of Financial Condition (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_StatementConsolidatedStatementsOfFinancialConditionParenthetical</Role>
      <ShortName>Consolidated Statements Of Financial Condition (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>100040 - Statement - Consolidated Statements of Operations (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/StatementConsolidatedStatementsOfOperationsUnaudited</Role>
      <ShortName>Consolidated Statements of Operations (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>100050 - Statement - Consolidated Statements Of Comprehensive Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_StatementConsolidatedStatementsOfComprehensiveIncomeUnaudited</Role>
      <ShortName>Consolidated Statements Of Comprehensive Income (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>100060 - Statement - Consolidated Statements Of Comprehensive Income (Parenthetical) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_StatementConsolidatedStatementsOfComprehensiveIncomeParentheticalUnaudited</Role>
      <ShortName>Consolidated Statements Of Comprehensive Income (Parenthetical) (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>100070 - Statement - Consolidated Statements of Changes in Shareholders' Equity (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/StatementConsolidatedStatementsOfChangesInShareholdersEquityUnaudited</Role>
      <ShortName>Consolidated Statements of Changes in Shareholders' Equity (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>100080 - Statement - Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/StatementConsolidatedStatementsOfChangesInShareholdersEquityParentheticalUnaudited</Role>
      <ShortName>Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>100090 - Statement - Consolidated Statements Of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_StatementConsolidatedStatementsOfCashFlowsUnaudited</Role>
      <ShortName>Consolidated Statements Of Cash Flows (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>100100 - Statement - Cash, Cash Equivalents, and Cash Restricted for Regulatory Purposes for Periods Presented in Consolidated Statement of Financial Condition</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_StatementCashCashEquivalentsAndCashRestrictedForRegulatoryPurposesForPeriodsPresentedInConsolidatedStatementOfFinancialCondition</Role>
      <ShortName>Cash, Cash Equivalents, and Cash Restricted for Regulatory Purposes for Periods Presented in Consolidated Statement of Financial Condition</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>100110 - Disclosure - Nature of Operations, Basis of Presentation, and Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureNatureOfOperationsBasisOfPresentationAndSummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Nature of Operations, Basis of Presentation, and Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>100120 - Disclosure - New Accounting Pronouncements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureNewAccountingPronouncements</Role>
      <ShortName>New Accounting Pronouncements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>100130 - Disclosure - Receivables From and Payables to Brokers, Dealers and Clearing Organizations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureReceivablesFromAndPayablesToBrokersDealersAndClearingOrganizations1</Role>
      <ShortName>Receivables From and Payables to Brokers, Dealers and Clearing Organizations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>100140 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureFairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>100150 - Disclosure - Financial Instruments Owned and Financial Instruments Sold, But Not Yet Purchased</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureFinancialInstrumentsOwnedAndFinancialInstrumentsSoldButNotYetPurchased3</Role>
      <ShortName>Financial Instruments Owned and Financial Instruments Sold, But Not Yet Purchased</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>100160 - Disclosure - Available-For-Sale And Held-To-Maturity Securities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureAvailableForSaleAndHeldToMaturitySecurities</Role>
      <ShortName>Available-For-Sale And Held-To-Maturity Securities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>100170 - Disclosure - Bank Loans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureBankLoans</Role>
      <ShortName>Bank Loans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>100180 - Disclosure - Goodwill and Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssets</Role>
      <ShortName>Goodwill and Intangible Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>100190 - Disclosure - Borrowings and Federal Home Loan Bank Advances</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureBorrowingsAndFederalHomeLoanBankAdvances</Role>
      <ShortName>Borrowings and Federal Home Loan Bank Advances</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>100200 - Disclosure - Senior Notes</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureSeniorNotes</Role>
      <ShortName>Senior Notes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>100210 - Disclosure - Bank Deposits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureBankDeposits</Role>
      <ShortName>Bank Deposits</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>100220 - Disclosure - Derivative Instruments and Hedging Activities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivities</Role>
      <ShortName>Derivative Instruments and Hedging Activities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>100230 - Disclosure - Disclosures About Offsetting Assets and Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureDisclosuresAboutOffsettingAssetsAndLiabilities1</Role>
      <ShortName>Disclosures About Offsetting Assets and Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>100240 - Disclosure - Commitments, Guarantees, and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureCommitmentsGuaranteesAndContingencies</Role>
      <ShortName>Commitments, Guarantees, and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>100250 - Disclosure - Legal Proceedings</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureLegalProceedings</Role>
      <ShortName>Legal Proceedings</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>100260 - Disclosure - Regulatory Capital Requirements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureRegulatoryCapitalRequirements</Role>
      <ShortName>Regulatory Capital Requirements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>100270 - Disclosure - Operating Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureOperatingLeases</Role>
      <ShortName>Operating Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>100280 - Disclosure - Revenues from Contracts with Customers</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureRevenuesFromContractsWithCustomers</Role>
      <ShortName>Revenues from Contracts with Customers</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>100290 - Disclosure - Interest Income and Interest Expense</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureInterestIncomeAndInterestExpense</Role>
      <ShortName>Interest Income and Interest Expense</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>100300 - Disclosure - Employee Incentive, Deferred Compensation, and Retirement Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureEmployeeIncentiveDeferredCompensationAndRetirementPlans1</Role>
      <ShortName>Employee Incentive, Deferred Compensation, and Retirement Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>100310 - Disclosure - Off-Balance Sheet Credit Risk</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureOffBalanceSheetCreditRisk</Role>
      <ShortName>Off-Balance Sheet Credit Risk</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>100320 - Disclosure - Segment Reporting</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureSegmentReporting</Role>
      <ShortName>Segment Reporting</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>100330 - Disclosure - Earnings Per Share ("EPS")</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureEarningsPerShareEPS</Role>
      <ShortName>Earnings Per Share ("EPS")</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>100340 - Disclosure - Shareholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureShareholdersEquity</Role>
      <ShortName>Shareholders' Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>100350 - Disclosure - Variable Interest Entities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureVariableInterestEntities1</Role>
      <ShortName>Variable Interest Entities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>100360 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureSubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>100370 - Disclosure - Nature of Operations, Basis of Presentation, and Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureNatureOfOperationsBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Nature of Operations, Basis of Presentation, and Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureNatureOfOperationsBasisOfPresentationAndSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>100380 - Disclosure - New Accounting Pronouncements (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureNewAccountingPronouncementsPolicies</Role>
      <ShortName>New Accounting Pronouncements (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureNatureOfOperationsBasisOfPresentationAndSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>100390 - Disclosure - Receivables From and Payables to Brokers, Dealers and Clearing Organizations (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureReceivablesFromAndPayablesToBrokersDealersAndClearingOrganizationsTables</Role>
      <ShortName>Receivables From and Payables to Brokers, Dealers and Clearing Organizations (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/DisclosureReceivablesFromAndPayablesToBrokersDealersAndClearingOrganizations1</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>100400 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureFairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureFairValueMeasurements</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>100410 - Disclosure - Financial Instruments Owned and Financial Instruments Sold, But Not Yet Purchased (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureFinancialInstrumentsOwnedAndFinancialInstrumentsSoldButNotYetPurchasedTables</Role>
      <ShortName>Financial Instruments Owned and Financial Instruments Sold, But Not Yet Purchased (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/DisclosureFinancialInstrumentsOwnedAndFinancialInstrumentsSoldButNotYetPurchased3</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>100420 - Disclosure - Available-For-Sale And Held-To-Maturity Securities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureAvailableForSaleAndHeldToMaturitySecuritiesTables</Role>
      <ShortName>Available-For-Sale And Held-To-Maturity Securities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureAvailableForSaleAndHeldToMaturitySecurities</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>100430 - Disclosure - Bank Loans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureBankLoansTables</Role>
      <ShortName>Bank Loans (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureBankLoans</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>100440 - Disclosure - Goodwill and Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsTables</Role>
      <ShortName>Goodwill and Intangible Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssets</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>100450 - Disclosure - Senior Notes (Tables)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureSeniorNotesTables</Role>
      <ShortName>Senior Notes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureSeniorNotes</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>100460 - Disclosure - Bank Deposits (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureBankDepositsTables</Role>
      <ShortName>Bank Deposits (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureBankDeposits</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>100470 - Disclosure - Derivative Instruments and Hedging Activities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesTables</Role>
      <ShortName>Derivative Instruments and Hedging Activities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivities</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>100480 - Disclosure - Disclosures About Offsetting Assets and Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureDisclosuresAboutOffsettingAssetsAndLiabilitiesTables</Role>
      <ShortName>Disclosures About Offsetting Assets and Liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/DisclosureDisclosuresAboutOffsettingAssetsAndLiabilities1</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>100490 - Disclosure - Regulatory Capital Requirements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureRegulatoryCapitalRequirementsTables</Role>
      <ShortName>Regulatory Capital Requirements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureRegulatoryCapitalRequirements</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>100500 - Disclosure - Operating Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureOperatingLeasesTables</Role>
      <ShortName>Operating Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureOperatingLeases</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>100510 - Disclosure - Revenues from Contracts with Customers (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureRevenuesFromContractsWithCustomersTables</Role>
      <ShortName>Revenues from Contracts with Customers (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureRevenuesFromContractsWithCustomers</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>100520 - Disclosure - Interest Income and Interest Expense (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureInterestIncomeAndInterestExpenseTables</Role>
      <ShortName>Interest Income and Interest Expense (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureInterestIncomeAndInterestExpense</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>100530 - Disclosure - Segment Reporting (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureSegmentReportingTables</Role>
      <ShortName>Segment Reporting (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureSegmentReporting</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>100540 - Disclosure - Earnings Per Share ("EPS") (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureEarningsPerShareEpsTables</Role>
      <ShortName>Earnings Per Share ("EPS") (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureEarningsPerShareEPS</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>100550 - Disclosure - Shareholders' Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureShareholdersEquityTables</Role>
      <ShortName>Shareholders' Equity (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureShareholdersEquity</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>100560 - Disclosure - Variable Interest Entities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureVariableInterestEntitiesTables</Role>
      <ShortName>Variable Interest Entities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/DisclosureVariableInterestEntities1</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>100570 - Disclosure - Receivables From and Payables to Brokers, Dealers and Clearing Organizations (Amounts Receivable from Brokers, Dealers, and Clearing Organizations) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureReceivablesFromAndPayablesToBrokersDealersAndClearingOrganizationsAmountsReceivableFromBrokersDealersAndClearingOrganizationsDetai</Role>
      <ShortName>Receivables From and Payables to Brokers, Dealers and Clearing Organizations (Amounts Receivable from Brokers, Dealers, and Clearing Organizations) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/DisclosureReceivablesFromAndPayablesToBrokersDealersAndClearingOrganizationsTables</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>100580 - Disclosure - Receivables From and Payables to Brokers, Dealers and Clearing Organizations (Amounts Payable to Brokers, Dealers, and Clearing Organizations) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureReceivablesFromAndPayablesToBrokersDealersAndClearingOrganizationsAmountsPayableToBrokersDealersAndClearingOrganizationsDetails</Role>
      <ShortName>Receivables From and Payables to Brokers, Dealers and Clearing Organizations (Amounts Payable to Brokers, Dealers, and Clearing Organizations) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/DisclosureReceivablesFromAndPayablesToBrokersDealersAndClearingOrganizationsTables</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>100590 - Disclosure - Fair Value Of Financial Instruments (Schedule Of Fair Value Of Investments In And Unfunded Commitments To Funds Measured At Net Asset Value) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsScheduleOfFairValueOfInvestmentsInAndUnfundedCommitmentsToFundsMeasuredAtNetAssetValueDetails</Role>
      <ShortName>Fair Value Of Financial Instruments (Schedule Of Fair Value Of Investments In And Unfunded Commitments To Funds Measured At Net Asset Value) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>100600 - Disclosure - Fair Value Of Financial Instruments (Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsFairValueOfAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails</Role>
      <ShortName>Fair Value Of Financial Instruments (Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>100610 - Disclosure - Fair Value Of Financial Instruments (Schedule Of Changes In Fair Value Associated With Level 3 Financial Instruments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsScheduleOfChangesInFairValueAssociatedWithLevel3FinancialInstrumentsDetails</Role>
      <ShortName>Fair Value Of Financial Instruments (Schedule Of Changes In Fair Value Associated With Level 3 Financial Instruments) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>100620 - Disclosure - Fair Value Of Financial Instruments (Schedule Of Fair Value Of Financial Instruments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsScheduleOfFairValueOfFinancialInstrumentsDetails</Role>
      <ShortName>Fair Value Of Financial Instruments (Schedule Of Fair Value Of Financial Instruments) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>100630 - Disclosure - Fair Value Of Financial Instruments (Estimated Fair Values Of Financial Instruments Not Measured At Fair Value On A Recurring Basis) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsEstimatedFairValuesOfFinancialInstrumentsNotMeasuredAtFairValueOnARecurringBasisDetails</Role>
      <ShortName>Fair Value Of Financial Instruments (Estimated Fair Values Of Financial Instruments Not Measured At Fair Value On A Recurring Basis) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>100650 - Disclosure - Financial Instruments Owned and Financial Instruments Sold, But Not Yet Purchased (Components of Trading Securities Owned and Trading Securities Sold, But Not Yet Purchased) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureFinancialInstrumentsOwnedAndFinancialInstrumentsSoldButNotYetPurchasedComponentsOfTradingSecuritiesOwnedAndTradingSecuritiesSold3</Role>
      <ShortName>Financial Instruments Owned and Financial Instruments Sold, But Not Yet Purchased (Components of Trading Securities Owned and Trading Securities Sold, But Not Yet Purchased) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/DisclosureFinancialInstrumentsOwnedAndFinancialInstrumentsSoldButNotYetPurchasedTables</ParentRole>
      <Position>64</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>100660 - Disclosure - Financial Instruments Owned and Financial Instruments Sold, But Not Yet Purchased (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureFinancialInstrumentsOwnedAndFinancialInstrumentsSoldButNotYetPurchasedNarrativeDetails</Role>
      <ShortName>Financial Instruments Owned and Financial Instruments Sold, But Not Yet Purchased (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/DisclosureFinancialInstrumentsOwnedAndFinancialInstrumentsSoldButNotYetPurchasedTables</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>100670 - Disclosure - Available-For-Sale And Held-To-Maturity Securities (Schedule Of Amortized Cost And Fair Values Of The Available For Sale Securities And Held To Maturity Securities) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureAvailableForSaleAndHeldToMaturitySecuritiesScheduleOfAmortizedCostAndFairValuesOfTheAvailableForSaleSecuritiesAndHeldToMaturitySecuritiesDetails</Role>
      <ShortName>Available-For-Sale And Held-To-Maturity Securities (Schedule Of Amortized Cost And Fair Values Of The Available For Sale Securities And Held To Maturity Securities) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureAvailableForSaleAndHeldToMaturitySecuritiesTables</ParentRole>
      <Position>66</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>100680 - Disclosure - Available-For-Sale And Held-To-Maturity Securities (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureAvailableForSaleAndHeldToMaturitySecuritiesNarrativeDetails</Role>
      <ShortName>Available-For-Sale And Held-To-Maturity Securities (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureAvailableForSaleAndHeldToMaturitySecuritiesTables</ParentRole>
      <Position>67</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>100690 - Disclosure - Available-For-Sale And Held-To-Maturity Securities (Schedule Of Amortized Cost And Fair Values Of Debt Securities By Contractual Maturity) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureAvailableForSaleAndHeldToMaturitySecuritiesScheduleOfAmortizedCostAndFairValuesOfDebtSecuritiesByContractualMaturityDetails</Role>
      <ShortName>Available-For-Sale And Held-To-Maturity Securities (Schedule Of Amortized Cost And Fair Values Of Debt Securities By Contractual Maturity) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureAvailableForSaleAndHeldToMaturitySecuritiesTables</ParentRole>
      <Position>68</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>100700 - Disclosure - Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureAvailableForSaleAndHeldToMaturitySecuritiesContractualMaturitiesDetails</Role>
      <ShortName>Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureAvailableForSaleAndHeldToMaturitySecuritiesTables</ParentRole>
      <Position>69</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>100710 - Disclosure - Available-For-Sale And Held-To-Maturity Securities (Schedule Of Gross Unrealized Losses And The Estimated Fair Value By Length Of Time In A Loss Position) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureAvailableForSaleAndHeldToMaturitySecuritiesScheduleOfGrossUnrealizedLossesAndTheEstimatedFairValueByLengthOfTimeInALossPositionDetails</Role>
      <ShortName>Available-For-Sale And Held-To-Maturity Securities (Schedule Of Gross Unrealized Losses And The Estimated Fair Value By Length Of Time In A Loss Position) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureAvailableForSaleAndHeldToMaturitySecuritiesTables</ParentRole>
      <Position>70</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>100720 - Disclosure - Available-For-Sale And Held-To-Maturity Securities (Schedule Of Amortized Cost Of Held-To-Maturity Securities By Credit Quality Indicator) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureAvailableForSaleAndHeldToMaturitySecuritiesScheduleOfAmortizedCostOfHeldToMaturitySecuritiesByCreditQualityIndicatorDetails</Role>
      <ShortName>Available-For-Sale And Held-To-Maturity Securities (Schedule Of Amortized Cost Of Held-To-Maturity Securities By Credit Quality Indicator) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureAvailableForSaleAndHeldToMaturitySecuritiesTables</ParentRole>
      <Position>71</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>100730 - Disclosure - Bank Loans (Schedule of Balance and Associated Percentage of Each Major Loan Category in Bank Loan Portfolio) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureBankLoansScheduleOfBalanceAndAssociatedPercentageOfEachMajorLoanCategoryInBankLoanPortfolioDetails</Role>
      <ShortName>Bank Loans (Schedule of Balance and Associated Percentage of Each Major Loan Category in Bank Loan Portfolio) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureBankLoansTables</ParentRole>
      <Position>72</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>100740 - Disclosure - Bank Loans (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureBankLoansNarrativeDetails</Role>
      <ShortName>Bank Loans (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureBankLoansTables</ParentRole>
      <Position>73</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>100750 - Disclosure - Bank Loans (Activity in the Allowance for Loan Losses by Portfolio Segment) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureBankLoansActivityInTheAllowanceForLoanLossesByPortfolioSegmentDetails</Role>
      <ShortName>Bank Loans (Activity in the Allowance for Loan Losses by Portfolio Segment) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureBankLoansTables</ParentRole>
      <Position>74</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>100760 - Disclosure - Bank Loans (Aging of the Recorded Investment in Past Due Loans) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureBankLoansAgingOfTheRecordedInvestmentInPastDueLoansDetails</Role>
      <ShortName>Bank Loans (Aging of the Recorded Investment in Past Due Loans) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureBankLoansTables</ParentRole>
      <Position>75</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>100770 - Disclosure - Bank Loans (Risk Category of Loan Portfolio) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureBankLoansRiskCategoryOfLoanPortfolioDetails</Role>
      <ShortName>Bank Loans (Risk Category of Loan Portfolio) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureBankLoansTables</ParentRole>
      <Position>76</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>100780 - Disclosure - Bank Loans (Schedule of Term Loans Amortized Cost Basis by Origination Year and Revolving Cost Amortized Cost Basis) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureBankLoansScheduleOfTermLoansAmortizedCostBasisByOriginationYearAndRevolvingCostAmortizedCostBasisDetails</Role>
      <ShortName>Bank Loans (Schedule of Term Loans Amortized Cost Basis by Origination Year and Revolving Cost Amortized Cost Basis) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureBankLoansTables</ParentRole>
      <Position>77</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>100790 - Disclosure - Goodwill and Intangible Assets (Carrying Amount Of Goodwill And Intangible Assets) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsCarryingAmountOfGoodwillAndIntangibleAssetsDetails</Role>
      <ShortName>Goodwill and Intangible Assets (Carrying Amount Of Goodwill And Intangible Assets) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsTables</ParentRole>
      <Position>78</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>100800 - Disclosure - Goodwill and Intangible Assets (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsNarrativeDetails</Role>
      <ShortName>Goodwill and Intangible Assets (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsTables</ParentRole>
      <Position>79</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>100810 - Disclosure - Goodwill and Intangible Assets (Intangible Assets) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsIntangibleAssetsDetails</Role>
      <ShortName>Goodwill and Intangible Assets (Intangible Assets) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsTables</ParentRole>
      <Position>80</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>100820 - Disclosure - Goodwill and Intangible Assets (Amortization Expense In Future Periods) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsAmortizationExpenseInFuturePeriodsDetails</Role>
      <ShortName>Goodwill and Intangible Assets (Amortization Expense In Future Periods) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsTables</ParentRole>
      <Position>81</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>100830 - Disclosure - Borrowings and Federal Home Loan Bank Advances (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureBorrowingsAndFederalHomeLoanBankAdvancesNarrativeDetails</Role>
      <ShortName>Borrowings and Federal Home Loan Bank Advances (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureBorrowingsAndFederalHomeLoanBankAdvances</ParentRole>
      <Position>82</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>100840 - Disclosure - Senior Notes (Summary of Senior Notes) (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureSeniorNotesSummaryOfSeniorNotesDetails</Role>
      <ShortName>Senior Notes (Summary of Senior Notes) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureSeniorNotesTables</ParentRole>
      <Position>83</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>100850 - Disclosure - Senior Notes (Summary of Senior Notes) (Parenthetical) (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureSeniorNotesSummaryOfSeniorNotesParentheticalDetails</Role>
      <ShortName>Senior Notes (Summary of Senior Notes) (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureSeniorNotesTables</ParentRole>
      <Position>84</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>100860 - Disclosure - Senior Notes (Schedule Of Corporate Debt Principal Maturities) (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureSeniorNotesScheduleOfCorporateDebtPrincipalMaturitiesDetails</Role>
      <ShortName>Senior Notes (Schedule Of Corporate Debt Principal Maturities) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureSeniorNotesTables</ParentRole>
      <Position>85</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>100870 - Disclosure - Bank Deposits (Schedule of Deposits) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureBankDepositsScheduleOfDepositsDetails</Role>
      <ShortName>Bank Deposits (Schedule of Deposits) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureBankDepositsTables</ParentRole>
      <Position>86</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>100880 - Disclosure - Bank Deposits (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureBankDepositsNarrativeDetails</Role>
      <ShortName>Bank Deposits (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureBankDepositsTables</ParentRole>
      <Position>87</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>100890 - Disclosure - Derivative Instruments and Hedging Activities (Schedule of Fair Values of Derivative Instruments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesScheduleOfFairValuesOfDerivativeInstrumentsDetails</Role>
      <ShortName>Derivative Instruments and Hedging Activities (Schedule of Fair Values of Derivative Instruments) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesTables</ParentRole>
      <Position>88</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>100900 - Disclosure - Derivative Instruments and Hedging Activities (Schedule of Maturiries of Derivative Instruments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesScheduleOfMatuririesOfDerivativeInstrumentsDetails</Role>
      <ShortName>Derivative Instruments and Hedging Activities (Schedule of Maturiries of Derivative Instruments) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesTables</ParentRole>
      <Position>89</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>100910 - Disclosure - Derivative Instruments and Hedging Activities (Schedule of Distribution of Customer Interest Rate Derivative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesScheduleOfDistributionOfCustomerInterestRateDerivativeDetails</Role>
      <ShortName>Derivative Instruments and Hedging Activities (Schedule of Distribution of Customer Interest Rate Derivative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesTables</ParentRole>
      <Position>90</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>100920 - Disclosure - Disclosures About Offsetting Assets and Liabilities - Financial Assets and Derivative Assets that are Subject to Offset (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureDisclosuresAboutOffsettingAssetsAndLiabilitiesFinancialAssetsAndDerivativeAssetsThatAreSubjectToOffsetDetails1</Role>
      <ShortName>Disclosures About Offsetting Assets and Liabilities - Financial Assets and Derivative Assets that are Subject to Offset (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>100930 - Disclosure - Disclosures About Offsetting Assets and Liabilities - Financial Assets and Derivative Assets that are Subject to Offset (Details) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureDisclosuresAboutOffsettingAssetsAndLiabilitiesFinancialAssetsAndDerivativeAssetsThatAreSubjectToOffsetDetailsParenthetical</Role>
      <ShortName>Disclosures About Offsetting Assets and Liabilities - Financial Assets and Derivative Assets that are Subject to Offset (Details) (Parenthetical)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>100940 - Disclosure - Disclosures About Offsetting Assets and Liabilities - Financial Liabilities and Derivative Liabilities that are Subject to Offset (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureDisclosuresAboutOffsettingAssetsAndLiabilitiesFinancialLiabilitiesAndDerivativeLiabilitiesThatAreSubjectToOffsetDetails1</Role>
      <ShortName>Disclosures About Offsetting Assets and Liabilities - Financial Liabilities and Derivative Liabilities that are Subject to Offset (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>100950 - Disclosure - Disclosures About Offsetting Assets and Liabilities - Financial Liabilities and Derivative Liabilities that are Subject to Offset (Details) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureDisclosuresAboutOffsettingAssetsAndLiabilitiesFinancialLiabilitiesAndDerivativeLiabilitiesThatAreSubjectToOffsetDetailsParenthetic</Role>
      <ShortName>Disclosures About Offsetting Assets and Liabilities - Financial Liabilities and Derivative Liabilities that are Subject to Offset (Details) (Parenthetical)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>100960 - Disclosure - Commitments, Guarantees, and Contingencies (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureCommitmentsGuaranteesAndContingenciesNarrativeDetails</Role>
      <ShortName>Commitments, Guarantees, and Contingencies (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureCommitmentsGuaranteesAndContingencies</ParentRole>
      <Position>95</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>100970 - Disclosure - Regulatory Capital Requirements (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureRegulatoryCapitalRequirementsNarrativeDetails</Role>
      <ShortName>Regulatory Capital Requirements (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureRegulatoryCapitalRequirementsTables</ParentRole>
      <Position>96</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>100980 - Disclosure - Regulatory Capital Requirements (Schedule Of Total Risk-Based, Tier 1 Risk-Based, And Tier 1 Leverage Ratios) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureRegulatoryCapitalRequirementsScheduleOfTotalRiskbasedTier1RiskbasedAndTier1LeverageRatiosDetails</Role>
      <ShortName>Regulatory Capital Requirements (Schedule Of Total Risk-Based, Tier 1 Risk-Based, And Tier 1 Leverage Ratios) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureRegulatoryCapitalRequirementsTables</ParentRole>
      <Position>97</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>101000 - Disclosure - Operating Leases (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureOperatingLeasesNarrativeDetails</Role>
      <ShortName>Operating Leases (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureOperatingLeasesTables</ParentRole>
      <Position>98</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>101010 - Disclosure - Operating Leases - (Schedule of Net Lease Cost) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureOperatingLeasesScheduleOfNetLeaseCostDetails</Role>
      <ShortName>Operating Leases - (Schedule of Net Lease Cost) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureOperatingLeasesTables</ParentRole>
      <Position>99</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>101020 - Disclosure - Operating Leases - (Schedule of Information About Operating Lease Liabilities) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureOperatingLeasesScheduleOfInformationAboutOperatingLeaseLiabilitiesDetails3</Role>
      <ShortName>Operating Leases - (Schedule of Information About Operating Lease Liabilities) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureOperatingLeasesTables</ParentRole>
      <Position>100</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>101030 - Disclosure - Operating Leases (Schedule of Future Minimum Future Payments Under Non - Cancelable Leases) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureOperatingLeasesScheduleOfFutureMinimumFuturePaymentsUnderNonCancelableLeasesDetails</Role>
      <ShortName>Operating Leases (Schedule of Future Minimum Future Payments Under Non - Cancelable Leases) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureOperatingLeasesTables</ParentRole>
      <Position>101</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>101040 - Disclosure - Revenues from Contracts with Customers (Schedule of Total Revenues Broken Out by Revenues from Contracts with Customers and Other Sources of Revenues) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureRevenuesFromContractsWithCustomersScheduleOfTotalRevenuesBrokenOutByRevenuesFromContractsWithCustomersAndOtherSourcesOfRevenuesDetails</Role>
      <ShortName>Revenues from Contracts with Customers (Schedule of Total Revenues Broken Out by Revenues from Contracts with Customers and Other Sources of Revenues) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureRevenuesFromContractsWithCustomersTables</ParentRole>
      <Position>102</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R103.htm</HtmlFileName>
      <LongName>101050 - Disclosure - Revenues from Contracts with Customers (Revenues from Contracts with Customers Disaggregated by Major Business Activity and Primary Geographic Regions) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureRevenuesFromContractsWithCustomersRevenuesFromContractsWithCustomersDisaggregatedByMajorBusinessActivityAndPrimaryGeographicRegionsDetails</Role>
      <ShortName>Revenues from Contracts with Customers (Revenues from Contracts with Customers Disaggregated by Major Business Activity and Primary Geographic Regions) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureRevenuesFromContractsWithCustomersTables</ParentRole>
      <Position>103</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R104.htm</HtmlFileName>
      <LongName>101060 - Disclosure - Revenues from Contracts with Customers (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureRevenuesFromContractsWithCustomersNarrativeDetails</Role>
      <ShortName>Revenues from Contracts with Customers (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureRevenuesFromContractsWithCustomersTables</ParentRole>
      <Position>104</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R105.htm</HtmlFileName>
      <LongName>101070 - Disclosure - Interest Income and Interest Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureInterestIncomeAndInterestExpenseDetails</Role>
      <ShortName>Interest Income and Interest Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureInterestIncomeAndInterestExpenseTables</ParentRole>
      <Position>105</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R106.htm</HtmlFileName>
      <LongName>101080 - Disclosure - Employee Incentive, Deferred Compensation, and Retirement Plans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureEmployeeIncentiveDeferredCompensationAndRetirementPlansDetails</Role>
      <ShortName>Employee Incentive, Deferred Compensation, and Retirement Plans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/DisclosureEmployeeIncentiveDeferredCompensationAndRetirementPlans1</ParentRole>
      <Position>106</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R107.htm</HtmlFileName>
      <LongName>101090 - Disclosure - Off-Balance Sheet Credit Risk (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureOffBalanceSheetCreditRiskDetails</Role>
      <ShortName>Off-Balance Sheet Credit Risk (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureOffBalanceSheetCreditRisk</ParentRole>
      <Position>107</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R108.htm</HtmlFileName>
      <LongName>101100 - Disclosure - Segment Reporting (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureSegmentReportingNarrativeDetails</Role>
      <ShortName>Segment Reporting (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureSegmentReportingTables</ParentRole>
      <Position>108</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R109.htm</HtmlFileName>
      <LongName>101110 - Disclosure - Segment Reporting (Schedule Of Operating Information, Segment) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureSegmentReportingScheduleOfOperatingInformationSegmentDetails</Role>
      <ShortName>Segment Reporting (Schedule Of Operating Information, Segment) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureSegmentReportingTables</ParentRole>
      <Position>109</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R110.htm</HtmlFileName>
      <LongName>101120 - Disclosure - Segment Reporting (Schedule Of Operating Information, Segment) (Parenthetical) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureSegmentReportingScheduleOfOperatingInformationSegmentParentheticalDetails</Role>
      <ShortName>Segment Reporting (Schedule Of Operating Information, Segment) (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureSegmentReportingTables</ParentRole>
      <Position>110</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R111.htm</HtmlFileName>
      <LongName>101130 - Disclosure - Segment Reporting (Schedule Of Information Of Total Assets On Segment Basis) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureSegmentReportingScheduleOfInformationOfTotalAssetsOnSegmentBasisDetails</Role>
      <ShortName>Segment Reporting (Schedule Of Information Of Total Assets On Segment Basis) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureSegmentReportingTables</ParentRole>
      <Position>111</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R112.htm</HtmlFileName>
      <LongName>101140 - Disclosure - Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureSegmentReportingScheduleOfNetRevenuesEarnedOnMajorGeographicalAreasDetails</Role>
      <ShortName>Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureSegmentReportingTables</ParentRole>
      <Position>112</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R113.htm</HtmlFileName>
      <LongName>101150 - Disclosure - Earnings Per Share ("EPS") (Computation Of Basic And Diluted Earnings Per Share) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureEarningsPerShareEpsComputationOfBasicAndDilutedEarningsPerShareDetails</Role>
      <ShortName>Earnings Per Share ("EPS") (Computation Of Basic And Diluted Earnings Per Share) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/DisclosureEarningsPerShareEpsTables</ParentRole>
      <Position>113</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R114.htm</HtmlFileName>
      <LongName>101160 - Disclosure - Earnings Per Share ("EPS") (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureEarningsPerShareEpsDetails</Role>
      <ShortName>Earnings Per Share ("EPS") (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/DisclosureEarningsPerShareEpsTables</ParentRole>
      <Position>114</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R115.htm</HtmlFileName>
      <LongName>101170 - Disclosure - Shareholders' Equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureShareholdersEquityDetails</Role>
      <ShortName>Shareholders' Equity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/DisclosureShareholdersEquityTables</ParentRole>
      <Position>115</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R116.htm</HtmlFileName>
      <LongName>101180 - Disclosure - Shareholders' Equity (Schedule of Company's Shares Repurchase Activity) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureShareholdersEquityScheduleOfCompanysSharesRepurchaseActivityDetails</Role>
      <ShortName>Shareholders' Equity (Schedule of Company's Shares Repurchase Activity) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/DisclosureShareholdersEquityTables</ParentRole>
      <Position>116</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R117.htm</HtmlFileName>
      <LongName>101190 - Disclosure - Variable Interest Entities (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureVariableInterestEntitiesNarrativeDetails</Role>
      <ShortName>Variable Interest Entities (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/DisclosureVariableInterestEntitiesTables</ParentRole>
      <Position>117</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R118.htm</HtmlFileName>
      <LongName>101200 - Disclosure - Variable Interest Entities - (Schedule of Aggregate Assets and Liabilities from VIEs) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureVariableInterestEntitiesScheduleOfAggregateAssetsAndLiabilitiesFromViesDetails</Role>
      <ShortName>Variable Interest Entities - (Schedule of Aggregate Assets and Liabilities from VIEs) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/DisclosureVariableInterestEntitiesTables</ParentRole>
      <Position>118</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R119.htm</HtmlFileName>
      <LongName>101210 - Disclosure - Variable Interest Entities (Schedule of Aggregate Assets, Liabilities, and Our Exposure to Loss from those VIEs) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/DisclosureVariableInterestEntitiesScheduleOfAggregateAssetsLiabilitiesAndOurExposureToLossFromThoseViesDetails</Role>
      <ShortName>Variable Interest Entities (Schedule of Aggregate Assets, Liabilities, and Our Exposure to Loss from those VIEs) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/DisclosureVariableInterestEntitiesTables</ParentRole>
      <Position>119</Position>
    </Report>
    <Report instance="sf-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R120.htm</HtmlFileName>
      <LongName>101220 - Disclosure - Subsequent Events (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureSubsequentEventsDetails</Role>
      <ShortName>Subsequent Events (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.stifel.com/20240630/taxonomy/role/Role_DisclosureSubsequentEvents</ParentRole>
      <Position>120</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="sf-20240630.htm">sf-20240630.htm</File>
    <File>sf-20240630.xsd</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="29">http://fasb.org/srt/2024</BaseTaxonomy>
    <BaseTaxonomy items="2140">http://fasb.org/us-gaap/2024</BaseTaxonomy>
    <BaseTaxonomy items="45">http://xbrl.sec.gov/dei/2024</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
