XML 131 R123.htm IDEA: XBRL DOCUMENT
v3.25.1

Fair Value of Financial Instruments - Summary of Range of Effective Yields and Weighted Average Effective Yields of Partnership's Investments (Details) | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Mortgage Revenue Bonds [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Weighted Average Effective Yields | [1] | 5.50% | 5.50%
Mortgage Revenue Bonds [Member] | Effective rate - minimum [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Range of Effective Yields |  | 3.40% | 3.70%
Mortgage Revenue Bonds [Member] | Effective rate - maximum [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Range of Effective Yields |  | 8.40% | 8.40%
Taxable Mortgage Revenue Bonds [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Weighted Average Effective Yields | [1] | 8.30% | 8.70%
Taxable Mortgage Revenue Bonds [Member] | Effective rate - minimum [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Range of Effective Yields |  | 6.60% | 7.10%
Taxable Mortgage Revenue Bonds [Member] | Effective rate - maximum [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Range of Effective Yields |  | 11.50% | 11.90%
Bond Purchase Commitment [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Range of Effective Yields |  | 6.90% |
Weighted Average Effective Yields | [1] | 6.90% |
[1] | Weighted by the total principal outstanding of all the respective securities as of the reporting date

X
- Definition Effective rate - the effective rate for the available for sale securities held in the portfolio. + References No definition available. + Details
Name: | ghi_EffectiveRate
Namespace Prefix: | ghi_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average effective yield. + References No definition available. + Details
Name: | ghi_WeightedAverageEffectiveYield
Namespace Prefix: | ghi_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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
- Details
Name: | us-gaap_FinancialInstrumentAxis=ghi_MortgageRevenueBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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