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Fair Value of Financial Instruments - Summary of Range of Effective Yields and Weighted Average Effective Yields of Partnership's Investments (Details) | Sep. 30, 2023 | Dec. 31, 2022
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Taxable Mortgage Revenue Bonds [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Weighted Average Effective Yields | [1] | 9.40% | 7.60%
Taxable Mortgage Revenue Bonds [Member] | Effective rate - minimum [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Range of Effective Yields |  | 7.30% | 6.50%
Taxable Mortgage Revenue Bonds [Member] | Effective rate - maximum [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Range of Effective Yields |  | 12.70% | 11.40%
Bond Purchase Commitment [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Range of Effective Yields |  | 5.30% | 4.50%
Weighted Average Effective Yields | [1] | 5.30% | 4.50%
Mortgage Revenue Bonds [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Weighted Average Effective Yields | [1],[2] | 5.80% | 5.10%
Mortgage Revenue Bonds [Member] | Effective rate - minimum [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Range of Effective Yields | [2] | 3.40% | 2.60%
Mortgage Revenue Bonds [Member] | Effective rate - maximum [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Range of Effective Yields | [2] | 8.80% | 20.30%
[1] | Weighted by the total principal outstanding of all the respective securities as of the reporting date
[2] | Mortgage revenue bonds excludes the Provision Center 2014-1 MRB for figures as of September 30, 2023 as the proton therapy center securing the MRB was successfully sold out of bankruptcy in July 2022 and the Partnership received liquidation proceeds of $3.7 million in January 2023. The valuation as of September 30, 2023 is based on expected additional liquidation proceeds of approximately $928,000 at final liquidation.

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