<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.21.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>243</ContextCount>
  <ElementCount>340</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>109</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>12</UnitCount>
  <MyReports>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0001001 - Document - Cover Page</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/CoverPage</Role>
      <ShortName>Cover Page</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>1001002 - Statement - Unaudited Interim Condensed Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/UnauditedInterimCondensedConsolidatedBalanceSheets</Role>
      <ShortName>Unaudited Interim Condensed Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1002003 - Statement - Unaudited Interim Condensed Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/UnauditedInterimCondensedConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Unaudited Interim Condensed Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1003004 - Statement - Unaudited Interim Condensed Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/UnauditedInterimCondensedConsolidatedStatementsofOperations</Role>
      <ShortName>Unaudited Interim Condensed Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1004005 - Statement - Unaudited Interim Condensed Consolidated Statements of Shareholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/UnauditedInterimCondensedConsolidatedStatementsofShareholdersEquity</Role>
      <ShortName>Unaudited Interim Condensed Consolidated Statements of Shareholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>1005006 - Statement - Unaudited Interim Condensed Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/UnauditedInterimCondensedConsolidatedStatementsofCashFlows</Role>
      <ShortName>Unaudited Interim Condensed Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>2101101 - Disclosure - Basis of Presentation and General Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/BasisofPresentationandGeneralInformation</Role>
      <ShortName>Basis of Presentation and General Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>2105102 - Disclosure - Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/SignificantAccountingPolicies</Role>
      <ShortName>Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>2107103 - Disclosure - Transactions with Related Parties</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/TransactionswithRelatedParties</Role>
      <ShortName>Transactions with Related Parties</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>2112104 - Disclosure - Vessels, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/VesselsNet</Role>
      <ShortName>Vessels, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>2116105 - Disclosure - Advances for Vessels</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/AdvancesforVessels</Role>
      <ShortName>Advances for Vessels</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>2119106 - Disclosure - Assets Held for Sale</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/AssetsHeldforSale</Role>
      <ShortName>Assets Held for Sale</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>2121107 - Disclosure - Long Term Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/LongTermDebt</Role>
      <ShortName>Long Term Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>2126108 - Disclosure - Share Capital</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/ShareCapital</Role>
      <ShortName>Share Capital</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>2128109 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/CommitmentsandContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>2132110 - Disclosure - Revenues</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/Revenues</Role>
      <ShortName>Revenues</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>2136111 - Disclosure - Vessel Operating Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/VesselOperatingExpenses</Role>
      <ShortName>Vessel Operating Expenses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>2139112 - Disclosure - Fair Value of Financial Instruments and Derivatives Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/FairValueofFinancialInstrumentsandDerivativesInstruments</Role>
      <ShortName>Fair Value of Financial Instruments and Derivatives Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>2146113 - Disclosure - Dividends</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/Dividends</Role>
      <ShortName>Dividends</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>2148114 - Disclosure - (Loss)/Earnings Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/LossEarningsPerShare</Role>
      <ShortName>(Loss)/Earnings Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>2151115 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/SubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>2206201 - Disclosure - Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/SignificantAccountingPoliciesPolicies</Role>
      <ShortName>Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.safebulkers.com/role/SignificantAccountingPolicies</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>2302301 - Disclosure - Basis of Presentation and General Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/BasisofPresentationandGeneralInformationTables</Role>
      <ShortName>Basis of Presentation and General Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.safebulkers.com/role/BasisofPresentationandGeneralInformation</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>2308302 - Disclosure - Transactions with Related Parties (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/TransactionswithRelatedPartiesTables</Role>
      <ShortName>Transactions with Related Parties (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.safebulkers.com/role/TransactionswithRelatedParties</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>2313303 - Disclosure - Vessels, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/VesselsNetTables</Role>
      <ShortName>Vessels, Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.safebulkers.com/role/VesselsNet</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>2317304 - Disclosure - Advances for Vessels (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/AdvancesforVesselsTables</Role>
      <ShortName>Advances for Vessels (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.safebulkers.com/role/AdvancesforVessels</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>2322305 - Disclosure - Long Term Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/LongTermDebtTables</Role>
      <ShortName>Long Term Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.safebulkers.com/role/LongTermDebt</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>2329306 - Disclosure - Commitments and Contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/CommitmentsandContingenciesTables</Role>
      <ShortName>Commitments and Contingencies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.safebulkers.com/role/CommitmentsandContingencies</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>2333307 - Disclosure - Revenues (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/RevenuesTables</Role>
      <ShortName>Revenues (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.safebulkers.com/role/Revenues</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>2337308 - Disclosure - Vessel Operating Expenses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/VesselOperatingExpensesTables</Role>
      <ShortName>Vessel Operating Expenses (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.safebulkers.com/role/VesselOperatingExpenses</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>2340309 - Disclosure - Fair Value of Financial Instruments and Derivatives Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/FairValueofFinancialInstrumentsandDerivativesInstrumentsTables</Role>
      <ShortName>Fair Value of Financial Instruments and Derivatives Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.safebulkers.com/role/FairValueofFinancialInstrumentsandDerivativesInstruments</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>2349310 - Disclosure - (Loss)/Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/LossEarningsPerShareTables</Role>
      <ShortName>(Loss)/Earnings Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.safebulkers.com/role/LossEarningsPerShare</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>2403401 - Disclosure - Basis of Presentation and General Information - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/BasisofPresentationandGeneralInformationAdditionalInformationDetails</Role>
      <ShortName>Basis of Presentation and General Information - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>2404402 - Disclosure - Basis of Presentation and General Information - Schedule of Subsidiaries (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/BasisofPresentationandGeneralInformationScheduleofSubsidiariesDetails</Role>
      <ShortName>Basis of Presentation and General Information - Schedule of Subsidiaries (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>2409403 - Disclosure - Transactions with Related Parties - The Managers (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/TransactionswithRelatedPartiesTheManagersDetails</Role>
      <ShortName>Transactions with Related Parties - The Managers (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>2410404 - Disclosure - Transactions with Related Parties - Schedule of Fees Charged by Managers (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/TransactionswithRelatedPartiesScheduleofFeesChargedbyManagersDetails</Role>
      <ShortName>Transactions with Related Parties - Schedule of Fees Charged by Managers (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>2411405 - Disclosure - Transactions with Related Parties - Credit Facility (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/TransactionswithRelatedPartiesCreditFacilityDetails</Role>
      <ShortName>Transactions with Related Parties - Credit Facility (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>2414406 - Disclosure - Vessels, Net - Schedule of Vessels (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/VesselsNetScheduleofVesselsDetails</Role>
      <ShortName>Vessels, Net - Schedule of Vessels (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>2415407 - Disclosure - Vessels, Net - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/VesselsNetAdditionalInformationDetails</Role>
      <ShortName>Vessels, Net - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>2418408 - Disclosure - Advances for Vessels - Schedule of Advances for Vessel Acquisition and Vessels under Construction (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/AdvancesforVesselsScheduleofAdvancesforVesselAcquisitionandVesselsunderConstructionDetails</Role>
      <ShortName>Advances for Vessels - Schedule of Advances for Vessel Acquisition and Vessels under Construction (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>2420409 - Disclosure - Assets Held for Sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/AssetsHeldforSaleDetails</Role>
      <ShortName>Assets Held for Sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.safebulkers.com/role/AssetsHeldforSale</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>2423410 - Disclosure - Long Term Debt - Schedule of Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/LongTermDebtScheduleofDebtDetails</Role>
      <ShortName>Long Term Debt - Schedule of Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>2424411 - Disclosure - Long Term Debt - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/LongTermDebtAdditionalInformationDetails</Role>
      <ShortName>Long Term Debt - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>2425412 - Disclosure - Long Term Debt - Annual Principal Payments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/LongTermDebtAnnualPrincipalPaymentsDetails</Role>
      <ShortName>Long Term Debt - Annual Principal Payments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>2427413 - Disclosure - Share Capital (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/ShareCapitalDetails</Role>
      <ShortName>Share Capital (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.safebulkers.com/role/ShareCapital</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>2430414 - Disclosure - Commitments and Contingencies - Schedule of Capital Expenditure Commitments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/CommitmentsandContingenciesScheduleofCapitalExpenditureCommitmentsDetails</Role>
      <ShortName>Commitments and Contingencies - Schedule of Capital Expenditure Commitments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>2431415 - Disclosure - Commitments and Contingencies - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/CommitmentsandContingenciesAdditionalInformationDetails</Role>
      <ShortName>Commitments and Contingencies - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>2434416 - Disclosure - Revenues - Revenues (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/RevenuesRevenuesDetails</Role>
      <ShortName>Revenues - Revenues (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>2435417 - Disclosure - Revenues - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/RevenuesAdditionalInformationDetails</Role>
      <ShortName>Revenues - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>2438418 - Disclosure - Vessel Operating Expenses - Schedule of Operating Expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/VesselOperatingExpensesScheduleofOperatingExpensesDetails</Role>
      <ShortName>Vessel Operating Expenses - Schedule of Operating Expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>2441419 - Disclosure - Fair Value of Financial Instruments and Derivatives Instruments - Details of Interest Rate Swap Transactions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/FairValueofFinancialInstrumentsandDerivativesInstrumentsDetailsofInterestRateSwapTransactionsDetails</Role>
      <ShortName>Fair Value of Financial Instruments and Derivatives Instruments - Details of Interest Rate Swap Transactions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>2442420 - Disclosure - Fair Value of Financial Instruments and Derivatives Instruments - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/FairValueofFinancialInstrumentsandDerivativesInstrumentsAdditionalInformationDetails</Role>
      <ShortName>Fair Value of Financial Instruments and Derivatives Instruments - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>2443421 - Disclosure - Fair Value of Financial Instruments and Derivatives Instruments - Derivatives Not Designated as Hedging Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/FairValueofFinancialInstrumentsandDerivativesInstrumentsDerivativesNotDesignatedasHedgingInstrumentsDetails</Role>
      <ShortName>Fair Value of Financial Instruments and Derivatives Instruments - Derivatives Not Designated as Hedging Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>2444422 - Disclosure - Fair Value of Financial Instruments and Derivatives Instruments - Amount of Gain / (Loss) Recognized on Derivatives (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/FairValueofFinancialInstrumentsandDerivativesInstrumentsAmountofGainLossRecognizedonDerivativesDetails</Role>
      <ShortName>Fair Value of Financial Instruments and Derivatives Instruments - Amount of Gain / (Loss) Recognized on Derivatives (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>2445423 - Disclosure - Fair Value of Financial Instruments and Derivatives Instruments - Valuation of Company's Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/FairValueofFinancialInstrumentsandDerivativesInstrumentsValuationofCompanysFinancialInstrumentsDetails</Role>
      <ShortName>Fair Value of Financial Instruments and Derivatives Instruments - Valuation of Company's Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>2447424 - Disclosure - Dividends (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/DividendsDetails</Role>
      <ShortName>Dividends (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.safebulkers.com/role/Dividends</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>2450425 - Disclosure - (Loss)/Earnings Per Share - Schedule of Computation of (Loss)/Earnings Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/LossEarningsPerShareScheduleofComputationofLossEarningsPerShareDetails</Role>
      <ShortName>(Loss)/Earnings Per Share - Schedule of Computation of (Loss)/Earnings Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="sb-20210930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>2452426 - Disclosure - Subsequent Events (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.safebulkers.com/role/SubsequentEventsDetails</Role>
      <ShortName>Subsequent Events (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.safebulkers.com/role/SubsequentEvents</ParentRole>
      <Position>58</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="6-K" original="sb-20210930.htm">sb-20210930.htm</File>
    <File>sb-20210930.xsd</File>
    <File>sb-20210930_cal.xml</File>
    <File>sb-20210930_def.xml</File>
    <File>sb-20210930_lab.xml</File>
    <File>sb-20210930_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://fasb.org/srt/2021-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/us-gaap/2021-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2021</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
