XML 97 R90.htm IDEA: XBRL DOCUMENT
v3.25.2

Other Assets - Summary of Taxable MRBs and GILs Acquired (Details) | 6 Months Ended
--- | ---
Jun. 30, 2025 USD ($) Unit | Jun. 30, 2024 USD ($) Unit
Governmental Issuer Loans [Line Items] |  |  |
Principal Outstanding at Date of Redemption |  |  | $ 22,073,000
Mortgage Revenue Bonds [Member] | Gateway and Yarbrough Predevelopment Project [Member] |  |  |
Governmental Issuer Loans [Line Items] |  |  |
Month Acquired |  | 2025-06 |
Property Location |  | West Sacramento, CA |
Original Maturity Date |  | Jul. 01, 2026 |
Interest Rate |  | 9.00% |
Taxable MRB, Initial Principal Funding |  | $ 800,000 |
Taxable MRB, Total Commitment |  | 2,000,000 |
Mortgage Revenue Bonds [Member] | Woodington Gardens Apartments - Series A-2 [Member] |  |  |
Governmental Issuer Loans [Line Items] |  |  |
Month Acquired |  |  | 2024-04
Original Maturity Date |  |  | May 01, 2029
Taxable MRB, Initial Principal Funding |  |  | $ 2,577,000
Taxable MRB, Total Commitment |  |  | $ 2,577,000
Mortgage Revenue Bonds [Member] | Residency at the Mayer Series A-T [Member] |  |  |
Governmental Issuer Loans [Line Items] |  |  |
Month Acquired | [1] |  | 2024-03
Property Location | [1] |  | Hollywood, CA
Units | Unit | [1] |  | 79
Original Maturity Date | [1] |  | Oct. 01, 2024
Principal Outstanding at Date of Redemption | [1] |  | $ 11,500,000
Mortgage Revenue Bonds [Member] | Residency at the Mayer Series A-T [Member] | SOFR [Member] |  |  |
Governmental Issuer Loans [Line Items] |  |  |
Interest Rate | [1],[2] |  | 3.70%
Governmental Issuer Loans [Member] |  |  |
Governmental Issuer Loans [Line Items] |  |  |
Principal Outstanding at Date of Redemption |  | $ 12,700,000 |
Governmental Issuer Loans [Member] | Poppy Grove I [Member] |  |  |
Governmental Issuer Loans [Line Items] |  |  |
Month Acquired |  | 2025-02 |
Property Location |  | Elk Grove, CA |
Units | Unit |  | 147 |
Original Maturity Date |  | Apr. 01, 2025 |
Interest Rate |  | 6.78% |
Principal Outstanding at Date of Redemption |  | $ 5,200,000 |
Governmental Issuer Loans [Member] | Poppy Grove II [Member] |  |  |
Governmental Issuer Loans [Line Items] |  |  |
Month Acquired |  | 2025-02 |
Property Location |  | Elk Grove, CA |
Units | Unit |  | 82 |
Original Maturity Date |  | Apr. 01, 2025 |
Interest Rate |  | 6.78% |
Principal Outstanding at Date of Redemption |  | $ 1,800,000 |
Governmental Issuer Loans [Member] | Poppy Grove III [Member] |  |  |
Governmental Issuer Loans [Line Items] |  |  |
Month Acquired |  | 2025-02 |
Property Location |  | Elk Grove, CA |
Units | Unit |  | 158 |
Original Maturity Date |  | Apr. 01, 2025 |
Interest Rate |  | 6.78% |
Principal Outstanding at Date of Redemption |  | $ 5,700,000 |
Governmental Issuer Loans [Member] | Hope On Avalon [Member] |  |  |
Governmental Issuer Loans [Line Items] |  |  |
Month Acquired |  |  | 2024-01
Property Location |  |  | Los Angeles, CA
Units | Unit |  |  | 88
Original Maturity Date |  |  | Feb. 01, 2024
Principal Outstanding at Date of Redemption |  |  | $ 10,573,000
Governmental Issuer Loans [Member] | Hope On Avalon [Member] | SOFR [Member] |  |  |
Governmental Issuer Loans [Line Items] |  |  |
Interest Rate |  |  | 3.55%
[1] | The borrower re-allocated $11.5 million of previously provided funding from a taxable MRB to a new MRB during the acquisition and rehabilitation phase of the property.
[2] | The interest rate is subject to an all-in floor of 3.95%.

X
- Definition Governmental issuer loans. + References No definition available. + Details
Name: | ghi_GovernmentalIssuerLoansLineItems
Namespace Prefix: | ghi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Mortgage loan on real estate property location + References No definition available. + Details
Name: | ghi_MortgageLoanOnRealEstatePropertyLocation
Namespace Prefix: | ghi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Mortgage loans on real estate, redemption, face amount. + References No definition available. + Details
Name: | ghi_MortgageLoansOnRealEstateRedemptionFaceAmount
Namespace Prefix: | ghi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Taxable mortgage revenue bond - Initial principal acquired. + References No definition available. + Details
Name: | ghi_TaxableMortgageRevenueBondInitialPrincipalAcquired
Namespace Prefix: | ghi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Taxable mortgage revenue bonds and remaining funding commitment year and month. + References No definition available. + Details
Name: | ghi_TaxableMortgageRevenueBondsAndRemainingFundingCommitmentYearAndMonth
Namespace Prefix: | ghi_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Taxable mortgage revenue bonds commitment. + References No definition available. + Details
Name: | ghi_TaxableMortgageRevenueBondsCommitment
Namespace Prefix: | ghi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Maturity date of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, in YYYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 29 -Paragraph Column C -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section S50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478322/948-310-S50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column C)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479628/948-310-S99-1 + Details
Name: | srt_MortgageLoanOnRealEstateFinalMaturityDate
Namespace Prefix: | srt_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Interest rate of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 29 -Paragraph Column B -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section S50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478322/948-310-S50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column B)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479628/948-310-S99-1 + Details
Name: | srt_MortgageLoansOnRealEstateInterestRate
Namespace Prefix: | srt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 29 -Paragraph Column A -Footnote 3 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section S50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478322/948-310-S50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479628/948-310-S99-1 + Details
Name: | srt_MortgageLoansOnRealEstateNumberOfLoans
Namespace Prefix: | srt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ghi_MortgageRevenueBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ghi_GatewayAndYarbroughPredevelopmentProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ghi_WoodingtonGardensApartmentsSeriesA2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ghi_ResidencyAtTheMayerSeriesATMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ghi_GovernmentalIssuerLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ghi_PoppyGroveOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ghi_PoppyGroveIIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ghi_PoppyGroveIIIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ghi_HopeOnAvalonMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |