| IRS990/AccountantCompileOrReviewInd | 0 | 0 |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 101970 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 97683 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 11991 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 21500 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | The mission of Midcoast Conservancy is to protect vital lands and waters on a scale that matters and to inspire wonder and action on behalf of all species and the Earth. We envision a world where our lands and waters are healthy and protected and where nature occupies a place of central importance in every person's life. |
| IRS990/AdvertisingGrp/FundraisingAmt | 0 | 1753 |
| IRS990/AdvertisingGrp/ManagementAndGeneralAmt | 0 | 335 |
| IRS990/AdvertisingGrp/ProgramServicesAmt | 0 | 9487 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 11575 |
| IRS990/AllOtherContributionsAmt | 0 | 1941431 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 5251 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 5887 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 45093 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 56231 |
| IRS990/AmendedReturnInd | 0 | X |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | Kristin Pennock |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 2073895150 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | PO Box 439 |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | Edgecomb |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | ME |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 04556 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | 0 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 228784 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 31762 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 6764 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 3632 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 53408 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 63804 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 1 |
| IRS990/ConferencesMeetingsGrp/ProgramServicesAmt | 0 | 1142 |
| IRS990/ConferencesMeetingsGrp/TotalAmt | 0 | 1142 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 1 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 2048831 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 104988 |
| IRS990/CYOtherExpensesAmt | 0 | 922235 |
| IRS990/CYOtherRevenueAmt | 0 | 3471 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 122946 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 492795 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 865206 |
| IRS990/CYTotalExpensesAmt | 0 | 1787441 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 142676 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 2280236 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 1 |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 34223 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 18430 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/FundraisingAmt | 0 | 1737 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 10464 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 24638 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 36839 |
| IRS990/Desc | 0 | - Permanently protected 981 acres in Lincoln, Waldo, and Knox counties, Maine, with public access. - Assured 7,932 acres of preserves with public access and 6,518 acres of other conserved land met highest standards for conserved property. - Conducted trail maintenance on our 95 miles of trails. - Began new strategic initiative to conserve 30,000 acres by 2030. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
| IRS990/DonatedServicesAndUseFcltsAmt | 0 | 5500 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/DonorRestrictionNetAssetsGrp/BOYAmt | 0 | 6950698 |
| IRS990/DonorRestrictionNetAssetsGrp/EOYAmt | 0 | 2343532 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | 1 |
| IRS990/ElectionOfBoardMembersInd | 0 | 1 |
| IRS990/EmployeeCnt | 0 | 18 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 450827 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 25401 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 25401 |
| IRS990/FeesForServicesLegalGrp/ManagementAndGeneralAmt | 0 | 185 |
| IRS990/FeesForServicesLegalGrp/ProgramServicesAmt | 0 | 4972 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 5157 |
| IRS990/FeesForServicesOtherGrp/FundraisingAmt | 0 | 8323 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 4400 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 89372 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 102095 |
| IRS990/ForeignActivitiesInd | 0 | 0 |
| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 8.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 3.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 10.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 10.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 3.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 7.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 8.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 14 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 15 | 40.00 |
| 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/IndividualTrusteeOrDirectorInd | 7 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 8 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 9 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 10 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 11 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 12 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 13 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 14 | 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 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 15 | 3382 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | Sally Butler |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | Carole Cifrino |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | Chuck Dinsmore |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | Carolyn Gabbe |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | Laurie Howarth |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | Tracy Moskovitz |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | Buck O'Herin |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | Liz Petruska |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | Mary Kate Reny |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | Hugh Riddleberger |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | Glenn Ritch |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | Joanne Steneck |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | Martin Welt |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | Ashley Baldwin |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | Tony Marple |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | Pete Nichols |
| 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 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 15 | 68803 |
| 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/ReportableCompFromRltdOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 15 | 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 | Secretary |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | President |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | Treasurer |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | Vice President |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | Treasurer |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | Executive Director |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1970 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 0 |
| IRS990/FundraisingDirectExpensesAmt | 0 | 26152 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 13220 |
| IRS990/GainOrLossGrp/OtherAmt | 0 | -1068 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 46923 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 15 |
| IRS990/GovernmentGrantsAmt | 0 | 107400 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 46923 |
| IRS990/GrossReceiptsAmt | 0 | 2336159 |
| IRS990/GrossRentsGrp/RealAmt | 0 | 40847 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 1 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 0 |
| IRS990/IndependentVotingMemberCnt | 0 | 15 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIIInd | 0 | X |
| IRS990/InformationTechnologyGrp/FundraisingAmt | 0 | 2172 |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 6075 |
| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 13381 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 21628 |
| IRS990/InsuranceGrp/FundraisingAmt | 0 | 2010 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 10644 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 44500 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 57154 |
| IRS990/InterestGrp/FundraisingAmt | 0 | 1827 |
| IRS990/InterestGrp/ManagementAndGeneralAmt | 0 | 1020 |
| IRS990/InterestGrp/ProgramServicesAmt | 0 | 15044 |
| IRS990/InterestGrp/TotalAmt | 0 | 17891 |
| IRS990/InventoriesForSaleOrUseGrp/BOYAmt | 0 | 3631 |
| IRS990/InventoriesForSaleOrUseGrp/EOYAmt | 0 | 0 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 59133 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 59133 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 2769627 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 2453116 |
| IRS990/IRPDocumentCnt | 0 | 30 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 316481 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 841504 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 998366 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 1314847 |
| IRS990/LegalDomicileStateCd | 0 | ME |
| IRS990/LessCostOthBasisSalesExpnssGrp/OtherAmt | 0 | 1068 |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 0 |
| IRS990/LessRentalExpensesGrp/RealAmt | 0 | 28703 |
| IRS990/LoanOutstandingInd | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | 0 |
| IRS990/LocalChaptersInd | 0 | 0 |
| IRS990/MaterialDiversionOrMisuseInd | 0 | 0 |
| IRS990/MembersOrStockholdersInd | 0 | 1 |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | 1 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MissionDesc | 0 | The mission of Midcoast Conservancy is to protect vital lands and waters on a scale that matters and to inspire wonder and action on behalf of all species and the Earth. We envision a world where our lands and waters are healthy and protected and where nature occupies a place of central importance in every person's life. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/MortgNotesPyblScrdInvstPropGrp/BOYAmt | 0 | 484425 |
| IRS990/MortgNotesPyblScrdInvstPropGrp/EOYAmt | 0 | 447932 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 14267436 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 10822643 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 45855 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 45855 |
| IRS990/NetIncmFromFundraisingEvtGrp/ExclusionAmt | 0 | -12932 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | -12932 |
| IRS990/NetRentalIncomeOrLossGrp/ExclusionAmt | 0 | 12144 |
| IRS990/NetRentalIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 12144 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | -390583 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 7316738 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 8479111 |
| IRS990/NoncashContributionsAmt | 0 | 434700 |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OccupancyGrp/FundraisingAmt | 0 | 1359 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 11565 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 12129 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 25053 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 7272 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 609 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 21458 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 29339 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 10832669 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 7770399 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 8068 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 4332 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 63709 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 76109 |
| IRS990/OtherExpensesGrp/Desc | 0 | Impairment Expense |
| IRS990/OtherExpensesGrp/Desc | 1 | Supplies |
| IRS990/OtherExpensesGrp/Desc | 2 | AmeriCorps Expense |
| IRS990/OtherExpensesGrp/Desc | 3 | Equipment Repairs & Ren |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 9708 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 1 | 0 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 2 | 8895 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 593 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 0 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 2 | 127 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 324206 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 94758 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 57937 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 3 | 22253 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 324206 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 105059 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 57937 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 31275 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 0 | 453000 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | Other Income |
| IRS990/OtherRevenueMiscGrp/ExclusionAmt | 0 | 4259 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | 4259 |
| IRS990/OtherRevenueTotalAmt | 0 | 4259 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 69690 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 37420 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 550308 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 657418 |
| IRS990/OtherWebsiteInd | 0 | X |
| IRS990/OthNotesLoansReceivableNetGrp/BOYAmt | 0 | 11589 |
| IRS990/OthNotesLoansReceivableNetGrp/EOYAmt | 0 | 2359 |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 6210 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 2946 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 47664 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 56820 |
| IRS990/PensionPlanContributionsGrp/FundraisingAmt | 0 | 1172 |
| IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt | 0 | 629 |
| IRS990/PensionPlanContributionsGrp/ProgramServicesAmt | 0 | 9254 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 11055 |
| IRS990/PledgesAndGrantsReceivableGrp/BOYAmt | 0 | 3300 |
| IRS990/PledgesAndGrantsReceivableGrp/EOYAmt | 0 | 63946 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 28182 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 38462 |
| IRS990/PrincipalOfficerNm | 0 | Buck O'Herin |
| IRS990/PriorPeriodAdjustmentsAmt | 0 | -3552505 |
| IRS990/ProfessionalFundraisingInd | 0 | 0 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 611600 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | Program Service Fees |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 122946 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 122946 |
| IRS990/ProgSrvcAccomActy2Grp/Desc | 0 | - Continued water quality monitoring in Sheepscot River and Damariscotta Lake watersheds. Partnered with Bigelow to monitor and test levels of cyanobacteria in Damariscotta Lake. Deployed temp loggers into the Sheepscot River to collect continuous temperature data. - Started water quality work in the Medomak River watershed, including bacteria monitoring of Broad Cove Clam Flats. - Continued to work with partners on project to ultimately remove the barrier to fish passage at Branch Mills Pond on the Sheepscot River. Began planning fish passage project at Ben Brook in Alna. - Continued oyster project in Sheepscot River to test for growth potential and water filtration. |
| IRS990/ProgSrvcAccomActy2Grp/ExpenseAmt | 0 | 847820 |
| IRS990/ProgSrvcAccomActy2Grp/RevenueAmt | 0 | 1500 |
| IRS990/ProgSrvcAccomActy3Grp/Desc | 0 | Community - Engaged with community programs on our preserves and at Hidden Valley Nature Center including educational and outdoor recreational programs for the public. - Served 3 local schools for outdoor lessons in environmental education at Hidden Valley Nature Center. - Began construction on new welcome center building. Healthy Organization - Reviewed & revised all organizational policies as part of 5-year land trust alliance re-accreditation. - Launched refreshed version of organizational website. |
| IRS990/ProgSrvcAccomActy3Grp/ExpenseAmt | 0 | 219854 |
| IRS990/ProgSrvcAccomActy3Grp/RevenueAmt | 0 | 84797 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 475 |
| IRS990/PYContributionsGrantsAmt | 0 | 1138072 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/PYInvestmentIncomeAmt | 0 | 50543 |
| IRS990/PYOtherExpensesAmt | 0 | 534166 |
| IRS990/PYOtherRevenueAmt | 0 | 107394 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 100949 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 235857 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 626460 |
| IRS990/PYTotalExpensesAmt | 0 | 1161101 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/PYTotalRevenueAmt | 0 | 1396958 |
| IRS990/QuidProQuoContributionsInd | 0 | 0 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 492795 |
| IRS990/RegularMonitoringEnfrcInd | 0 | 1 |
| IRS990/RelatedEntityInd | 0 | 0 |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | 0 |
| IRS990/RentalIncomeOrLossGrp/RealAmt | 0 | 12144 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | 0 |
| IRS990/ReportLandBuildingEquipmentInd | 0 | 1 |
| IRS990/ReportOtherAssetsInd | 0 | 1 |
| IRS990/ReportOtherLiabilitiesInd | 0 | 0 |
| IRS990/ReportProgramRelatedInvstInd | 0 | 0 |
| IRS990/RevenueAmt | 0 | 36649 |