| IRS990/AccountantCompileOrReviewInd | 0 | 0 |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 89925 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 112744 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 274124 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 134675 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | SILVER LINING MENTORING'S MISSION IS TO EMPOWER YOUTH IMPACTED BY FOSTER CARE TO FLOURISH THROUGH COMMITTED MENTORING RELATIONSHIPS AND THE DEVELOPMENT OF ESSENTIAL LIFE SKILLS. SILVER LINING MENTORING (SLM) IS THE ONLY MENTORING ORGANIZATION IN MASSACHUSETTS THAT EXCLUSIVELY SERVES YOUTH IN FOSTER CARE. THE YOUNG PEOPLE SERVED BY SLM HAVE BEEN REMOVED FROM THEIR HOMES DUE TO ABUSE AND/OR NEGLECT AND FACE FREQUENT CHANGES IN RESIDENTIAL PROGRAMS, SCHOOLS, COMMUNITIES AND CAREGIVERS. SLM'S VOLUNTEER MENTORS ARE OFTEN THE ONLY ADULTS IN FOSTER YOUTH'S LIVES WHO ARE NOT PAID TO SPEND TIME WITH THEM.SILVER LINING MENTORING SERVES YOUTH AGES 7 AND OLDER THROUGH MENTORS, A COMMUNITY BASED ONE-TO-ONE MENTORING PROGRAM, AND THROUGH LEADERS, A LIFE-SKILLS PROGRAM FOR YOUNG PEOPLE AGES 14 AND OLDER WHO ARE PREPARING TO "AGE OUT" OF THE CHILD WELFARE SYSTEM. BOTH PROGRAMS ARE BACKED BY SILVER LINING'S TEAM OF CLINICALLY TRAINED, MASTERS LEVEL PROGRAM STAFF WHO HAVE POPULATION-SPECIFIC EXPERTI |
| IRS990/AllOtherContributionsAmt | 0 | 985395 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 1 |
| IRS990/BackupWthldComplianceInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/PersonNm | 0 | COLBY SWETTBERG |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 6172241300 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 727 ATLANTIC AVENUE 3RD FLOOR |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | BOSTON |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 02111 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOfficerEntInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 1331113 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 1482811 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 44411 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 103627 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 148038 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 0 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 0 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/ContriRptFundraisingEventAmt | 0 | 596873 |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 1708498 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 2060 |
| IRS990/CYOtherExpensesAmt | 0 | 334437 |
| IRS990/CYOtherRevenueAmt | 0 | -91898 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 2875 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | -7689 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 1294787 |
| IRS990/CYTotalExpensesAmt | 0 | 1629224 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 277190 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 1621535 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 0 |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 4631 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 2608 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/FundraisingAmt | 0 | 1567 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 522 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 8356 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 10445 |
| IRS990/Desc | 0 | SILVER LINING MENTORING IS PROUD TO REPORT ORGANIZATIONAL PROGRESS. IN 2018 SILVER LINING MENTORING SERVED 403 BOSTON AREA YOUTH AND YOUNG ADULTS THROUGH ONE-TO-ONE MENTORING RELATIONSHIPS, LIFE SKILLS LEARNING, COMMUNITY ACTIVITIES, AND SUPPORT FROM CLINICALLY-TRAINED SOCIAL WORKERS. THE COMMUNITY BASED MENTORING PROGRAM GREW BY 16%. THE LEARN & EARN PROGRAM CONTINUED WITH ITS COHORT-BASED MODEL, WITH 75% OF PARTICIPANTS CHOOSING TO TRANSITION INTO COMMUNITY BASED MENTORING AFTER GRADUATION. SILVER LINING MENTORING CONTINUES TO INVEST IN TRACKING PARTICIPANT OUTCOMES AND HAS DELIVERED IMPRESSIVE RESULTS. A SAMPLE OF DATA SHOWS THAT 76% OF YOUNG PEOPLE WE WORK WITH OVER AGE 18 ARE EMPLOYED, COMPARED TO 43% OF FOSTER CARE ALUMNI NATION-WIDE. IN ADDITION, 74% OF SILVER LINING MENTORING YOUTH HAVE GRADUATED FROM HIGH SCHOOL AND 23% HAVE ENROLLED IN COLLEGE, COMPARED TO 54% AND 3% RESPECTIVELY OF ALL YOUNG ADULTS WHO HAVE LEFT FOSTER CARE. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/ElectionOfBoardMembersInd | 0 | 0 |
| IRS990/EmployeeCnt | 0 | 19 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 1237981 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FederatedCampaignsAmt | 0 | 30680 |
| IRS990/FeesForServicesAccountingGrp/FundraisingAmt | 0 | 19780 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 1917 |
| IRS990/FeesForServicesAccountingGrp/ProgramServicesAmt | 0 | 70427 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 92124 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 1140 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 24471 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 25611 |
| IRS990/ForeignActivitiesInd | 0 | 0 |
| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 7 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 8 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 9 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 10 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 20288 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 12 | 9599 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | SCOTT KNOX |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | ALFONSO PERILLO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | ROY F BATES |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | ANNE BOWIE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | MAURICE G BRADSHAW |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | DANIELLE HALDERMAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | EDWARD HALE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | BRYAN NELSON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | JUSTIN PASQUARIELLO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | TOM SHIRK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | ANNA VOUROS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | COLBY SWETTBERG |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | JULIE ASHER |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 127750 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 101500 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | BOARD CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | VICE CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | CEO |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | DEPUTY DIRECTOR |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 2001 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 1 |
| IRS990/FundraisingAmt | 0 | 596873 |
| IRS990/FundraisingDirectExpensesAmt | 0 | 92664 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 0 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 11 |
| IRS990/GovernmentGrantsAmt | 0 | 95550 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossReceiptsAmt | 0 | 1714199 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 1 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 1 |
| IRS990/IndependentVotingMemberCnt | 0 | 11 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 2 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIIInd | 0 | X |
| IRS990/InformationTechnologyGrp/FundraisingAmt | 0 | 6705 |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 4318 |
| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 12428 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 23451 |
| IRS990/InsuranceGrp/FundraisingAmt | 0 | 1204 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 401 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 6419 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 8024 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 2060 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 2060 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/IRPDocumentCnt | 0 | 6 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 34008 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 12440 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 6330 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 40338 |
| IRS990/LegalDomicileStateCd | 0 | MA |
| IRS990/LoanOutstandingInd | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | 0 |
| IRS990/LocalChaptersInd | 0 | 0 |
| IRS990/MaterialDiversionOrMisuseInd | 0 | 0 |
| IRS990/MembersOrStockholdersInd | 0 | 0 |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | 1 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MissionDesc | 0 | SILVER LINING MENTORING'S MISSION IS TO EMPOWER YOUTH IMPACTED BY FOSTER CARE TO FLOURISH THROUGH COMMITTED MENTORING RELATIONSHIPS AND THE DEVELOPMENT OF ESSENTIAL LIFE SKILLS. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 1934254 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 1926565 |
| IRS990/NetIncmFromFundraisingEvtGrp/ExclusionAmt | 0 | -92664 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | -92664 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OccupancyGrp/FundraisingAmt | 0 | 13898 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 4633 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 74126 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 92657 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 2392 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 798 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 12756 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 15946 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsSFAS117Ind | 0 | X |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 12957 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 7808 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 65973 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 86738 |
| IRS990/OtherExpensesGrp/Desc | 0 | PROGRAM EXPENSES |
| IRS990/OtherExpensesGrp/Desc | 1 | PROFESSIONAL DEVELOPMEN |
| IRS990/OtherExpensesGrp/Desc | 2 | MENTOR RECRUITMENT |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 2224 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 3284 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 46373 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 10267 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 3044 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 46373 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 15775 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 3044 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 0 | 900099 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | MISCELLANEOUS |
| IRS990/OtherRevenueMiscGrp/RelatedOrExemptFuncIncomeAmt | 0 | 766 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | 766 |
| IRS990/OtherRevenueTotalAmt | 0 | 766 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 153045 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 83952 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 719179 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 956176 |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 16808 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 3391 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 71279 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 91478 |
| IRS990/PensionPlanContributionsGrp/FundraisingAmt | 0 | 2199 |
| IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt | 0 | 902 |
| IRS990/PensionPlanContributionsGrp/ProgramServicesAmt | 0 | 9256 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 12357 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 19168 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 24286 |
| IRS990/PrincipalOfficerNm | 0 | COLBY SWETTBERG |
| IRS990/ProfessionalFundraisingInd | 0 | 0 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 900099 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | PROGRAM INCOME |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 2875 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 2875 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 1547994 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/PYInvestmentIncomeAmt | 0 | 78 |
| IRS990/PYOtherExpensesAmt | 0 | 289170 |
| IRS990/PYOtherRevenueAmt | 0 | -79320 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 20050 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 74953 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 1124679 |
| IRS990/PYTotalExpensesAmt | 0 | 1413849 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/PYTotalRevenueAmt | 0 | 1488802 |
| IRS990/QuidProQuoContributionsInd | 0 | 1 |
| IRS990/QuidProQuoContriDisclInd | 0 | 1 |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | -7689 |
| IRS990/RegularMonitoringEnfrcInd | 0 | 1 |
| IRS990/RelatedEntityInd | 0 | 0 |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | 0 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | 0 |
| IRS990/ReportLandBuildingEquipmentInd | 0 | 1 |
| IRS990/ReportOtherAssetsInd | 0 | 0 |
| IRS990/ReportOtherLiabilitiesInd | 0 | 0 |
| IRS990/ReportProgramRelatedInvstInd | 0 | 0 |
| IRS990/RevenueAmt | 0 | 3641 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 391965 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 393815 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearAmt | 0 | 1708498 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus1YearAmt | 0 | 1547994 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 1834406 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 985846 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 1090015 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/TotalAmt | 0 | 7166759 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearAmt | 0 | 2060 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus1YearAmt | 0 | 78 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 72 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 77 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 131 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/TotalAmt | 0 | 2418 |
| IRS990ScheduleA/GrossReceiptsRltdActivitiesAmt | 0 | 22925 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearAmt | 0 | 766 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus1YearAmt | 0 | 839 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 445 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 475 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 161 |
| IRS990ScheduleA/OtherIncome170Grp/TotalAmt | 0 | 2686 |
| IRS990ScheduleA/PublicOrganization170Ind | 0 | X |
| IRS990ScheduleA/PublicSupportCY170Pct | 0 | 0.98240 |
| IRS990ScheduleA/PublicSupportPY170Pct | 0 | 0.97380 |
| IRS990ScheduleA/PublicSupportTotal170Amt | 0 | 7045757 |
| IRS990ScheduleA/SubstantialContributorsTotAmt | 0 | 121002 |
| IRS990ScheduleA/ThirtyThrPctSuprtTestsCY170Ind | 0 | X |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearAmt | 0 | 1708498 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus1YearAmt | 0 | 1547994 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 1834406 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 985846 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 1090015 |
| IRS990ScheduleA/TotalCalendarYear170Grp/TotalAmt | 0 | 7166759 |
| IRS990ScheduleA/TotalSupportAmt | 0 | 7171863 |
| IRS990/ScheduleBRequiredInd | 0 | 1 |
| IRS990ScheduleD/BoardDesignatedBalanceEOYPct | 0 | 1.00000 |
| IRS990ScheduleD/CYEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 480000 |
| IRS990ScheduleD/CYEndwmtFundGrp/EndYearBalanceAmt | 0 | 480000 |
| IRS990ScheduleD/CYMinus1YrEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 480000 |
| IRS990ScheduleD/CYMinus1YrEndwmtFundGrp/EndYearBalanceAmt | 0 | 480000 |
| IRS990ScheduleD/CYMinus2YrEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 390000 |
| IRS990ScheduleD/CYMinus2YrEndwmtFundGrp/ContributionsAmt | 0 | 90000 |
| IRS990ScheduleD/CYMinus2YrEndwmtFundGrp/EndYearBalanceAmt | 0 | 480000 |
| IRS990ScheduleD/CYMinus3YrEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 300000 |
| IRS990ScheduleD/CYMinus3YrEndwmtFundGrp/ContributionsAmt | 0 | 90000 |
| IRS990ScheduleD/CYMinus3YrEndwmtFundGrp/EndYearBalanceAmt | 0 | 390000 |
| IRS990ScheduleD/CYMinus4YrEndwmtFundGrp/ContributionsAmt | 0 | 300000 |
| IRS990ScheduleD/CYMinus4YrEndwmtFundGrp/EndYearBalanceAmt | 0 | 300000 |
| IRS990ScheduleD/DonatedServicesAndUseFcltsAmt | 0 | 3854 |
| IRS990ScheduleD/DonatedServicesUseFcltsAmt | 0 | 3854 |
| IRS990ScheduleD/EndowmentsHeldRelatedOrgInd | 0 | 0 |
| IRS990ScheduleD/EndowmentsHeldUnrelatedOrgInd | 0 | 0 |
| IRS990ScheduleD/EquipmentGrp/BookValueAmt | 0 | 6330 |
| IRS990ScheduleD/EquipmentGrp/DepreciationAmt | 0 | 34008 |
| IRS990ScheduleD/EquipmentGrp/OtherCostOrOtherBasisAmt | 0 | 40338 |
| IRS990ScheduleD/ExpensesNotReportedAmt | 0 | 3854 |
| IRS990ScheduleD/ExpensesNotRptFinclStmtAmt | 0 | 0 |
| IRS990ScheduleD/ExpensesSubtotalAmt | 0 | 1629224 |
| IRS990ScheduleD/FootnoteTextInd | 0 | X |
| IRS990ScheduleD/PrmnntEndowmentBalanceEOYPct | 0 | 0.00000 |
| IRS990ScheduleD/RevenueNotReportedAmt | 0 | 3854 |
| IRS990ScheduleD/RevenueNotReportedFinclStmtAmt | 0 | 0 |
| IRS990ScheduleD/RevenueSubtotalAmt | 0 | 1621535 |
| IRS990ScheduleD/SupplementalInformationDetail/ExplanationTxt | 0 | BOARD DESIGNATED NET ASSETS REPRESENTS FUNDS SET ASIDE BY THE BOARD OF DIRECTORS FOR FUTURE STRATEGIC GROWTH INITIATIVES. |
| IRS990ScheduleD/SupplementalInformationDetail/ExplanationTxt | 1 | SLM ACCOUNTS FOR UNCERTAINTY IN INCOME TAXES IN ACCORDANCE WITH ASC TOPIC, INCOME TAXES. THIS STANDARD CLARIFIES THE ACCOUNTING FOR UNCERTAINTY IN TAX POSITIONS AND PRESCRIBES A RECOGNITION THRESHOLD AND MEASUREMENT ATTRIBUTE FOR THE FINANCIAL STATEMENTS REGARDING A TAX POSITION TAKEN OR EXPECTED TO BE TAKEN IN A TAX RETURN. SLM HAS DETERMINED THAT THERE ARE NO UNCERTAIN TAX POSITIONS WHICH QUALIFY FOR EITHER RECOGNITION OR DISCLOSURE IN THE FINANCIAL STATEMENTS AS OF DECEMBER 31, 2018. SLM'S INFORMATION RETURNS ARE SUBJECT TO EXAMINATION BY FEDERAL AND STATE JURISDICTIONS. |
| IRS990ScheduleD/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | PART V, LINE 4: |
| IRS990ScheduleD/SupplementalInformationDetail/FormAndLineReferenceDesc | 1 | PART X, LINE 2: |
| IRS990ScheduleD/TermEndowmentBalanceEOYPct | 0 | 0.00000 |
| IRS990ScheduleD/TotalBookValueLandBuildingsAmt | 0 | 6330 |
| IRS990ScheduleD/TotalExpensesPerForm990Amt | 0 | 1629224 |
| IRS990ScheduleD/TotalRevenuePerForm990Amt | 0 | 1621535 |
| IRS990ScheduleD/TotalRevEtcAuditedFinclStmtAmt | 0 | 1625389 |
| IRS990ScheduleD/TotExpnsEtcAuditedFinclStmtAmt | 0 | 1633078 |
| IRS990ScheduleG/FundraisingEventInformationGrp/CharitableContributionsTotAmt | 0 | 596873 |
| IRS990ScheduleG/FundraisingEventInformationGrp/CharitableContriEvent1Amt | 0 | 524113 |
| IRS990ScheduleG/FundraisingEventInformationGrp/CharitableContriEvent2Amt | 0 | 50618 |
| IRS990ScheduleG/FundraisingEventInformationGrp/CharitableContriOtherEventsAmt | 0 | 22142 |
| IRS990ScheduleG/FundraisingEventInformationGrp/DirectExpenseSummaryEventsAmt | 0 | 92668 |
| IRS990ScheduleG/FundraisingEventInformationGrp/Event1Nm | 0 | MATCH EVENT |
| IRS990ScheduleG/FundraisingEventInformationGrp/Event2Nm | 0 | BOSTON MARATHON |