XML 152 R142.htm IDEA: XBRL DOCUMENT v3.23.3

Subsequent Events - Summary of Initial Terms of TOB Trusts Financings (Details) - USD ($)	1 Months Ended
	Oct. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Subsequent Event [Line Items]
TOB Trust Financing		$ 1,081,409,507	$ 1,058,903,952
TOB Trust [Member]
Subsequent Event [Line Items]
TOB Trust Financing		$ 137,007,000		$ 67,092,000
Subsequent Event [Member] | TOB Trust [Member] | MRB [Member] | The Safford [Member]
Subsequent Event [Line Items]
TOB Trust Financing	$ 6,050,000
Stated Maturity	2026-10
Interest Rate Type	Variable
Tax-Exempt Interest on Senior Securities	Yes
Remarketing Senior Securities Rate	4.46%
Facility Fees	1.44%
Interest Rate	5.90%

X

- Definition

Debt financing liabilities net.

+ References

No definition available.

+ Details

Name:	ghi_DebtFinancingLiabilitiesNet
Namespace Prefix:	ghi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Debt financing tax-exempt Interest on Senior Securities.

+ References

No definition available.

+ Details

Name:	ghi_DebtFinancingTaxExemptInterestOnSeniorSecurities
Namespace Prefix:	ghi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Debt instrument maturity month and year.

+ References

No definition available.

+ Details

Name:	ghi_DebtInstrumentMaturityMonthAndYear
Namespace Prefix:	ghi_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Debt instrument percentage of facility fees.

+ References

No definition available.

+ Details

Name:	ghi_DebtInstrumentPercentageOfFacilityFees
Namespace Prefix:	ghi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Debt instrument remarketing senior securities rate.

+ References

No definition available.

+ Details

Name:	ghi_DebtInstrumentRemarketingSeniorSecuritiesRate
Namespace Prefix:	ghi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Description of reference rate used for variable rate of debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481674/830-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483399/855-10-50-2

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=ghi_TOBTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ghi_MortgageRevenueBondMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ghi_TheSaffordMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: