XML 133 R126.htm IDEA: XBRL DOCUMENT
v3.25.2

Fair Value of Financial Instruments - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Total Assets at Fair Value, net | $ 1,041,236,108 | $ 1,059,525,935
Fair Value, Inputs, Level 2 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total Assets at Fair Value, net | 197,113 | 6,371,054
Fair Value, Inputs, Level 3 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total Assets at Fair Value, net | 1,041,038,995 | 1,053,154,881
Mortgage Revenue Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Assets at Fair Value | 1,004,463,460 | 1,026,483,796
Mortgage Revenue Bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Assets at Fair Value | 1,004,463,460 | 1,026,483,796
Bond Purchase Commitment [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Assets at Fair Value | 1,833,078 |
Bond Purchase Commitment [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Assets at Fair Value | 1,833,078 |
Taxable Mortgage Revenue Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Assets at Fair Value | 34,742,457 | 26,671,085
Taxable Mortgage Revenue Bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Assets at Fair Value | 34,742,457 | 26,671,085
Derivative Instruments (Reported within Other Assets) [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Assets at Fair Value | 2,103,718 | 6,980,820
Derivative Instruments (Reported within Other Assets) [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Assets at Fair Value | 2,103,718 | 6,980,820
Derivative Swap Liability (Reported within Other Liabilities) [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Liabilities at Fair Value | (1,906,605) | (609,766)
Derivative Swap Liability (Reported within Other Liabilities) [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Liabilities at Fair Value | $ (1,906,605) | $ (609,766)

X
- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-13 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-12 + Details
Name: | us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of asset after deduction of liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueNetAssetLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=ghi_BondPurchaseCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=ghi_TaxableBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_DerivativeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_SwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |