XML 133 R126.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Fair Value of Financial Instruments - Summary of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Total Assets at Fair Value, net | $ 962,899,939 | $ 956,882,340
Fair Value Inputs Level 2 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total Assets at Fair Value, net | 9,038,723 | 4,548,704
Fair Value, Inputs, Level 3 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total Assets at Fair Value, net | 953,861,216 | 952,333,636
Mortgage Revenue Bonds Held In Trust [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Assets at Fair Value | 922,468,164 | 883,030,786
Mortgage Revenue Bonds Held In Trust [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Assets at Fair Value | 922,468,164 | 883,030,786
Mortgage Revenue Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Assets at Fair Value | 20,277,433 | 47,644,509
Mortgage Revenue Bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Assets at Fair Value | 20,277,433 | 47,644,509
Bond Purchase Commitment [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Assets at Fair Value | 134,829 | 197,788
Bond Purchase Commitment [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Assets at Fair Value | 134,829 | 197,788
Taxable Mortgage Revenue Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Assets at Fair Value | 10,980,756 | 21,460,288
Taxable Mortgage Revenue Bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Assets at Fair Value | 10,980,756 | 21,460,288
Derivative Instruments (Reported within Other Assets) [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Assets at Fair Value | 9,263,602 | 5,254,663
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 | 9,263,568 | 5,254,398
Derivative Instruments (Reported within Other Assets) [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Assets at Fair Value | 34 | 265
Derivative Swap Liability (reported within other liabilities) |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Liabilities at Fair Value | (224,845) | (705,694)
Derivative Swap Liability (reported within other liabilities) | Fair Value Inputs Level 2 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Liabilities at Fair Value | $ (224,845) | $ (705,694)

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -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 No definition available. + 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 No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -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_MortgageRevenueBondsHeldInTrustMember
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: |