| IRS990/AccountantCompileOrReviewInd | 0 | false |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 23020 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 44148 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 0 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | false |
| IRS990/ActivityOrMissionDesc | 0 | THE PERMANENT PROTECTION AND ENCOURAGEMENT OF AGRICULTURAL, HABITAT, OPEN SPACE LANDS, AND RECREATIONAL TRAILS IN THE TRI-VALLEY OF NORTHERN CALIFORNIA. |
| IRS990/AdvertisingGrp/FundraisingAmt | 0 | 5772 |
| IRS990/AdvertisingGrp/ProgramServicesAmt | 0 | 51948 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 57720 |
| IRS990/AllAffiliatesIncludedInd | 0 | false |
| IRS990/AllOtherContributionsAmt | 0 | 141298 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 895 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 1346 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 31120 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 33361 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | true |
| IRS990/AuditCommitteeInd | 0 | true |
| IRS990/BackupWthldComplianceInd | 0 | true |
| IRS990/BenefitsToMembersGrp/TotalAmt | 0 | 0 |
| IRS990/BooksInCareOfDetail/PersonNm | 0 | LAURA MERCIER |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 9254498706 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 1457 FIRST STREET |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | LIVERMORE |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | CA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 94550 |
| IRS990/BusinessRlnWithFamMemInd | 0 | false |
| IRS990/BusinessRlnWithOfficerEntInd | 0 | false |
| IRS990/BusinessRlnWithOrgMemInd | 0 | false |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 874379 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 1039131 |
| IRS990/ChangeToOrgDocumentsInd | 0 | false |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/CollectionsOfArtInd | 0 | false |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 2845 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 4743 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 87266 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 94854 |
| IRS990/CompDisqualPersonsGrp/TotalAmt | 0 | 0 |
| IRS990/CompensationFromOtherSrcsInd | 0 | false |
| IRS990/CompensationProcessCEOInd | 0 | true |
| IRS990/CompensationProcessOtherInd | 0 | true |
| IRS990/ConferencesMeetingsGrp/ManagementAndGeneralAmt | 0 | 1144 |
| IRS990/ConferencesMeetingsGrp/ProgramServicesAmt | 0 | 21742 |
| IRS990/ConferencesMeetingsGrp/TotalAmt | 0 | 22886 |
| IRS990/ConflictOfInterestPolicyInd | 0 | true |
| IRS990/ConservationEasementsInd | 0 | true |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | false |
| IRS990/CreditCounselingInd | 0 | false |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 141298 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 1632981 |
| IRS990/CYOtherExpensesAmt | 0 | 497752 |
| IRS990/CYOtherRevenueAmt | 0 | 59437 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 64276 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 1066383 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 333857 |
| IRS990/CYTotalExpensesAmt | 0 | 831609 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 39771 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 1897992 |
| IRS990/DAFExcessBusinessHoldingsInd | 0 | false |
| IRS990/DecisionsSubjectToApprovaInd | 0 | false |
| IRS990/DeductibleArtContributionInd | 0 | false |
| IRS990/DeductibleNonCashContriInd | 0 | false |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 5583 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | false |
| IRS990/DepreciationDepletionGrp/FundraisingAmt | 0 | 106 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 176 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 3252 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 3534 |
| IRS990/Desc | 0 | THE CONSERVANCY HAS INCURRED DIRECT EXPENSES FOR THE ANNUAL MONITORING OF 60 EASEMENTS (103 PROPERTIES)AND CONTINUING TO BUILD RELATIONSHIPS WITH OUR PARTNERS THE PROPERTY OWNERS OF THE LANDS COVERED BY CONSERVATION EASEMENTS HELD BY TVC. |
| IRS990/DescribedInSection501c3Ind | 0 | true |
| IRS990/DisregardedEntityInd | 0 | false |
| IRS990/DistributionToDonorInd | 0 | false |
| IRS990/DocumentRetentionPolicyInd | 0 | true |
| IRS990/DonorAdvisedFundInd | 0 | false |
| IRS990/ElectionOfBoardMembersInd | 0 | true |
| IRS990/EmployeeCnt | 0 | 6 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | true |
| IRS990/EngagedInExcessBenefitTransInd | 0 | false |
| IRS990/EscrowAccountInd | 0 | false |
| IRS990/ExpenseAmt | 0 | 754811 |
| IRS990/FamilyOrBusinessRlnInd | 0 | false |
| IRS990/FederalGrantAuditRequiredInd | 0 | false |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 1054 |
| IRS990/FeesForServicesAccountingGrp/ProgramServicesAmt | 0 | 20019 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 21073 |
| IRS990/FeesForServicesLegalGrp/ManagementAndGeneralAmt | 0 | 161 |
| IRS990/FeesForServicesLegalGrp/ProgramServicesAmt | 0 | 7870 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 8031 |
| IRS990/FeesForServicesLobbyingGrp/TotalAmt | 0 | 0 |
| IRS990/FeesForServicesManagementGrp/TotalAmt | 0 | 0 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 11985 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 113347 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 125332 |
| IRS990/FeesForServicesProfFundraising/TotalAmt | 0 | 0 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/ManagementAndGeneralAmt | 0 | 1120 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/ProgramServicesAmt | 0 | 21275 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/TotalAmt | 0 | 22395 |
| IRS990/ForeignActivitiesInd | 0 | false |
| IRS990/ForeignFinancialAccountInd | 0 | false |
| IRS990/ForeignGrantsGrp/TotalAmt | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | false |
| IRS990/Form1098CFiledInd | 0 | false |
| IRS990/Form8282FiledCnt | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | false |
| IRS990/Form8899Filedind | 0 | false |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 0 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 1 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 2 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 3 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 4 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 5 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 6 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 7 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 8 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 9 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 10 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 11 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 50.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 1.00 |
| 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/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 4 | 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 | 9500 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | ART JEANNET |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | CHRISTOPHER SCHLIES |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | MELODY O'SHEA |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | RYAN CALLAHAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | MATT FORD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | NORMAN PETERMEIER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | JEFF CRANOR |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | CLAY WIDMAYER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | MARY ROBERTS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | MICHAEL FREDRICH |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | LAURA MERCIER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | JEFF WILLIAMS |
| 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 | 85354 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 0 |
| 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/TitleTxt | 0 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | Secretary |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | Chairman |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | Treasurer |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | Executive Dir. |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | VICE CHAIR |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | true |
| IRS990/Form990TFiledInd | 0 | false |
| IRS990/FormationYr | 0 | 1994 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | false |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | true |
| IRS990/FundraisingActivitiesInd | 0 | true |
| IRS990/FundraisingDirectExpensesAmt | 0 | 63847 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 90092 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 1204879 |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 12 |
| IRS990/GrantsToDomesticIndividualsGrp/TotalAmt | 0 | 0 |
| IRS990/GrantsToDomesticOrgsGrp/TotalAmt | 0 | 0 |
| IRS990/GrantsToIndividualsInd | 0 | false |
| IRS990/GrantsToOrganizationsInd | 0 | false |
| IRS990/GrantToRelatedPersonInd | 0 | false |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 7845402 |
| IRS990/GrossReceiptsAmt | 0 | 8602362 |
| IRS990/GroupReturnForAffiliatesInd | 0 | false |
| IRS990/IncludeFIN48FootnoteInd | 0 | false |
| IRS990/IncmFromInvestBondProceedsGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/IndependentAuditFinclStmtInd | 0 | true |
| IRS990/IndependentVotingMemberCnt | 0 | 12 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartIXInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InformationTechnologyGrp/FundraisingAmt | 0 | 159 |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 159 |
| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 2865 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 3183 |
| IRS990/InsuranceGrp/FundraisingAmt | 0 | 341 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 341 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 16387 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 17069 |
| IRS990/IntangibleAssetsGrp/EOYAmt | 0 | 0 |
| IRS990/InterestGrp/TotalAmt | 0 | 0 |
| IRS990/InventoriesForSaleOrUseGrp/EOYAmt | 0 | 0 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 428102 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 428102 |
| IRS990/InvestmentInJointVentureInd | 0 | false |
| IRS990/InvestmentsOtherSecuritiesGrp/BOYAmt | 0 | 9265955 |
| IRS990/InvestmentsOtherSecuritiesGrp/EOYAmt | 0 | 9255554 |
| IRS990/InvestmentsProgramRelatedGrp/EOYAmt | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 6104345 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 6269380 |
| IRS990/InvestTaxExemptBondsInd | 0 | false |
| IRS990/IRPDocumentCnt | 0 | 11 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 34082 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 1509181 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 1507393 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 1541475 |
| IRS990/LegalDomicileStateCd | 0 | CA |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 6640523 |
| IRS990/LicensedMoreThanOneStateInd | 0 | false |
| IRS990/LoanOutstandingInd | 0 | false |
| IRS990/LobbyingActivitiesInd | 0 | true |
| IRS990/LocalChaptersInd | 0 | false |
| IRS990/MaterialDiversionOrMisuseInd | 0 | false |
| IRS990/MembersOrStockholdersInd | 0 | true |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | false |
| IRS990/MinutesOfGoverningBodyInd | 0 | true |
| IRS990/MissionDesc | 0 | THE PERMANENT PROTECTION AND ENCOURAGEMENT OF AGRICULTURAL, HABITAT, OPEN SPACE LANDS, AND RECREATIONAL TRAILS IN THE TRI-VALLEY OF NORTHERN CALIFORNIA. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |
| IRS990/MoreThan5000KToOrgInd | 0 | false |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 17815640 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 18101179 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 1204879 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 1204879 |
| IRS990/NetIncmFromFundraisingEvtGrp/ExclusionAmt | 0 | 26245 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | 26245 |
| IRS990/NetIncomeFromGamingGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetRentalIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | -780844 |
| IRS990/NondeductibleContributionsInd | 0 | false |
| IRS990/OccupancyGrp/FundraisingAmt | 0 | 1489 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 2482 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 45670 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 49641 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 219 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 366 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 6737 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 7322 |
| IRS990/OfficerMailingAddressInd | 0 | false |
| IRS990/OnBehalfOfIssuerInd | 0 | false |
| IRS990/OperateHospitalInd | 0 | false |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsSFAS117Ind | 0 | X |
| IRS990/OrgFiledInLieuOfForm1041Ind | 0 | false |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 84800 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 79452 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 372 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 620 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 11413 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 12405 |
| IRS990/OtherExpensesGrp/Desc | 0 | STEWARDSHIP EXPENSES |
| IRS990/OtherExpensesGrp/Desc | 1 | ACQUISITION EXPENSE |
| IRS990/OtherExpensesGrp/Desc | 2 | LEGISLATIVE SUPPORT |
| IRS990/OtherExpensesGrp/Desc | 3 | SPECIAL EVENTS |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 20774 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 44929 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 34395 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 26107 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 44929 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 34395 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 26107 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 20774 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | OTHER INCOME |
| IRS990/OtherRevenueMiscGrp/Desc | 1 | STEWARDSHIP INCOME |
| IRS990/OtherRevenueMiscGrp/RelatedOrExemptFuncIncomeAmt | 0 | 2040 |
| IRS990/OtherRevenueMiscGrp/RelatedOrExemptFuncIncomeAmt | 1 | 31152 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | 2040 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 1 | 31152 |
| IRS990/OtherRevenueTotalAmt | 0 | 33192 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 5959 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 9930 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 182714 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 198603 |
| IRS990/OthNotesLoansReceivableNetGrp/EOYAmt | 0 | 0 |
| IRS990/OwnWebsiteInd | 0 | X |
| IRS990/PartialLiquidationInd | 0 | false |
| IRS990/PaymentsToAffiliatesGrp/TotalAmt | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | false |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 840 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 1400 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 25755 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 27995 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 0 |
| IRS990/PledgesAndGrantsReceivableGrp/EOYAmt | 0 | 0 |
| IRS990/PoliticalCampaignActyInd | 0 | false |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 0 |
| IRS990/ProfessionalFundraisingInd | 0 | false |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | MITIGATION INCOME |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 64276 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 64276 |
| IRS990/ProgSrvcAccomActy2Grp/Desc | 0 | 2014 LIVERMORE VALLEY UNCORKED - 38 WINERIES ENTERED WITH 98 WINES. IN SUPPORT OF TVC'S MISSION TO SUPPORT VITICULTURE TO BE AN ECONOMICAL VIABLE CROP, TVC HOLDS THE COMPETITION AND PROMOTES THE WINNING WINES THROUGHOUT THE EAST BAY AND SAN FRANCISCO BAY AREA. |
| IRS990/ProgSrvcAccomActy3Grp/Desc | 0 | RESTORATION AND CLEAN UP:ADOPT A CREEK SPOT - TVC ADOPTED A STRETCH OF THE ARROYO MOCHO AT ROBERTSON PARK. TVC IS ASSUMING RESPONSIBILITY OF CLEANING AND MONITORING THE ARROYO YEAR ROUND FOR THE ENJOYMENT OF WILDLIFE, PARK VISITORS AND THE COMMUNITY. TVC WITH VOLUNTEERS GATHERED TO SUPPORT THE COASTAL CLEANUP DAY BY COLLECTING TRASH AND DEBRIS ALONG ARROYO MOCHO AND MAINTAINING THE OAK TREES NORTH OF THE ARROYO.HARVEST CLEAN UP - TVC ALONG WITH CE PROPERTY OWNERS, TVC VOLUNTEERS AND HELPS LIVERMORE VALLEY WINERIES TO PREPARE FOR THE ANNUAL HARVEST FESTIVAL. TRASH AND DEBRIS WERE COLLECTED ALONG GREENVILLE ROAD, TESLA ROAD, MINES ROAD, ARROYO ROAD, AND WETMORE. |
| IRS990/ProhibitedTaxShelterTransInd | 0 | false |
| IRS990/PYContributionsGrantsAmt | 0 | 85847 |
| IRS990/PYExcessBenefitTransInd | 0 | false |
| IRS990/PYInvestmentIncomeAmt | 0 | 1153267 |
| IRS990/PymtTravelEntrtnmntPubOfclGrp/TotalAmt | 0 | 0 |
| IRS990/PYOtherExpensesAmt | 0 | 354630 |
| IRS990/PYOtherRevenueAmt | 0 | 50247 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 36976 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 646871 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 324836 |
| IRS990/PYTotalExpensesAmt | 0 | 679466 |
| IRS990/PYTotalRevenueAmt | 0 | 1326337 |
| IRS990/QuidProQuoContributionsInd | 0 | true |
| IRS990/QuidProQuoContriDisclInd | 0 | true |
| IRS990/RcvblFromDisqualifiedPrsnGrp/EOYAmt | 0 | 0 |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | false |
| IRS990/ReceivablesFromOfficersEtcGrp/EOYAmt | 0 | 0 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 1066383 |
| IRS990/RegularMonitoringEnfrcInd | 0 | true |
| IRS990/RelatedEntityInd | 0 | false |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | false |
| IRS990/ReportInvestmentsOtherSecInd | 0 | true |
| IRS990/ReportLandBuildingEquipmentInd | 0 | true |
| IRS990/ReportOtherAssetsInd | 0 | false |
| IRS990/ReportOtherLiabilitiesInd | 0 | false |
| IRS990/ReportProgramRelatedInvstInd | 0 | false |
| IRS990/RoyaltiesGrp/TotalAmt | 0 | 0 |
| IRS990/RoyaltiesRevenueGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 0 |
| IRS990ScheduleA/FactsAndCircumstancesTestTxt | 0 | Current Year Facts and Circumstances: Tri-Valley Conservancy (TVC) is recognized as a Grantee in 60 Conservation Easements. TVC agreed, by accepting these grants, to honor the intentions of Grantor stated herein to promote, preserve and enhance the agricultural potential and Conservation Values of the Property for the benefit of the people of the City of Livermore or Pleasanton, the people of the County of Alameda, and the people of the State of California, and agrees to accept the terms and conditions of this grant. Three of our directors are appointed by two cities: Livermore and Pleasanton and Alameda County. It is the purpose of these Easements to preserve forever the Conservation Values of the Property and to prevent any use of the Property that will impair or interfere with the Conservation Values. In order for TVC to fulfill their responsibilities TVC created two investment funds Working Capital Fund and an Endowment Fund. These funds were put in place so that we can ensure TVC is invested for in perpetuity. At this time our contributions are dwarfed by our investment revenue. The majority of these funds came from mitigation requirements due to programs in place by Cities of Livermore and Pleasanton and Alameda County. We have a Fund Raising program and in the last five years we have increased individual donations and grants.Almost 50% of the properties directly support the public with trails and parkland. There is an eight mile public trail: horses, runners/walkers and bicycles run through 1,900 acres of the land that is under conservation easements held by TVC. In addition there is over 500 acres open to the public as parkland that host multiple local trails and two regional trails. The remaining other acres have habitat areas, local agriculture and open space. |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearAmt | 0 | 141298 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus1YearAmt | 0 | 85847 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 57773 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 92247 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 380409 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/TotalAmt | 0 | 757574 |
| IRS990ScheduleA/GovtFurnSrvcFcltsVl170Grp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearAmt | 0 | 428102 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus1YearAmt | 0 | 389266 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 469810 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 415546 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 405612 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/TotalAmt | 0 | 2108336 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearAmt | 0 | 1328163 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus1YearAmt | 0 | 851633 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 20206 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 484082 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 120617 |
| IRS990ScheduleA/OtherIncome170Grp/TotalAmt | 0 | 2804701 |
| IRS990ScheduleA/PublicOrganization170Ind | 0 | X |
| IRS990ScheduleA/PublicSupportCY170Pct | 0 | 0.13360 |
| IRS990ScheduleA/PublicSupportPY170Pct | 0 | 0.28380 |
| IRS990ScheduleA/PublicSupportTotal170Amt | 0 | 757574 |
| IRS990ScheduleA/SubstantialContributorsTotAmt | 0 | 0 |