XML 79 R72.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Governmental Issuer Loans - Additional Information (Details) | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Feb. 29, 2024 USD ($) | Mar. 31, 2024 USD ($) Property Entities | Dec. 31, 2023 USD ($) Property | Jan. 01, 2023 USD ($)
Governmental Issuer Loans [Line Items] |  |  |  |
Number of Variable Interest Entities | Property |  | 30 | 33 |
Allowance for credit losses |  |  |  | $ 5,900,000
Governmental Issuer Loans [Member] |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |
Accrued interest receivable |  | $ 1,400,000 | $ 1,500,000 |
Number of Variable Interest Entities | Entities |  | 2 |  |
Outstanding principal |  | $ 133,200,000 |  |
Property Loans [Member] |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |
Outstanding principal |  | $ 4,700,000 |  |
Scharbauer Flats Apartments [Member] | Governmental Issuer Loans [Member] |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |
Partnership recognized loan fee | $ 87,000 |  |  |

X
- Definition Accrued interest receivable + References No definition available. + Details
Name: | ghi_AccruedInterestReceivable
Namespace Prefix: | ghi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition allowance for credit losses. + References No definition available. + Details
Name: | ghi_AllowanceForCreditLosses
Namespace Prefix: | ghi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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 The number of variable interest entities owned. + References No definition available. + Details
Name: | ghi_NumberOfVariableInterestEntities
Namespace Prefix: | ghi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Partnership recognized loan fee. + References No definition available. + Details
Name: | ghi_PartnershipRecognizedLoanFee
Namespace Prefix: | ghi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This is the principal amount outstanding for securitized loans only (across all types of loans). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Subparagraph (a) -Paragraph 4 -SubTopic 20 -Topic 860 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-4 + Details
Name: | us-gaap_PrincipalAmountOutstandingOnLoansSecuritized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

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