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Governmental Issuer Loans - Summary of Partnership's GIL Investments (Details) | 12 Months Ended
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Dec. 31, 2023 USD ($) Unit | Dec. 31, 2022 USD ($) Unit
Governmental Issuer Loans [Line Items] |  |  |  |  |
Amortized Cost |  | $ 221,653,300 |  | $ 300,230,435 |
Poppy Grove I I [Member] | TOB Trust [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Maturity Date | [1] |  |  | Apr. 01, 2025 |
Poppy Grove I I I [Member] | TOB Trust [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Maturity Date | [1] |  |  | Apr. 01, 2025 |
Governmental Issuer Loans [Member] | TOB Trust [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Units | Unit |  | 1,627 |  | 2,419 |
Amortized Cost |  | $ 222,947,300 |  | $ 300,230,435 |
Governmental Issuer Loans [Member] | Scharbauer Flats Apartments [Member] | TOB Trust [Member] | Midland, TX [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Month Acquired | [2] |  |  | June 2020 |
Units | Unit | [2] |  |  | 300 |
Maturity Date | [2],[3] |  |  | Jul. 01, 2023 |
Current Interest Rate | [2] |  |  | 6.76% |
Amortized Cost | [2] |  |  | $ 40,000,000 |
Governmental Issuer Loans [Member] | Scharbauer Flats Apartments [Member] | TOB Trust [Member] | SIFMA [Member] | Midland, TX [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Variable Interest Rate | [2],[4] |  |  | 3.10% |
Governmental Issuer Loans [Member] | Oasis at Twin Lakes [Member] | TOB Trust [Member] | Roseville, MN [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Month Acquired | [2] |  |  | July 2020 |
Units | Unit | [2] |  |  | 228 |
Maturity Date | [2],[3] |  |  | Aug. 01, 2023 |
Current Interest Rate | [2] |  |  | 5.91% |
Amortized Cost | [2] |  |  | $ 34,000,000 |
Governmental Issuer Loans [Member] | Oasis at Twin Lakes [Member] | TOB Trust [Member] | SIFMA [Member] | Roseville, MN [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Variable Interest Rate | [2],[4] |  |  | 2.25% |
Governmental Issuer Loans [Member] | Centennial Crossings [Member] | TOB Trust [Member] | Centennial, CO [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Month Acquired | [2] |  |  | August 2020 |
Units | Unit | [2] |  |  | 209 |
Maturity Date | [2],[3] |  |  | Sep. 01, 2023 |
Current Interest Rate | [2] |  |  | 6.41% |
Amortized Cost | [2] |  |  | $ 33,080,000 |
Governmental Issuer Loans [Member] | Centennial Crossings [Member] | TOB Trust [Member] | SIFMA [Member] | Centennial, CO [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Variable Interest Rate | [2],[4] |  |  | 2.75% |
Governmental Issuer Loans [Member] | Legacy Commons at Signal Hills [Member] | TOB Trust [Member] | St Paul, MN [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Month Acquired |  | January 2021 | [5] | January 2021 | [2]
Units | Unit |  | 247 | [5] | 247 | [2]
Maturity Date |  | Feb. 01, 2024 | [5],[6] | Feb. 01, 2024 | [2],[3]
Current Interest Rate |  | 8.46% | [5] | 7.37% | [2]
Amortized Cost |  | $ 34,620,000 | [5] | $ 34,620,000 | [2]
Governmental Issuer Loans [Member] | Legacy Commons at Signal Hills [Member] | TOB Trust [Member] | SOFR [Member] | St Paul, MN [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Variable Interest Rate |  | 3.07% | [5],[7] | 3.07% | [2],[4]
Governmental Issuer Loans [Member] | Hilltop at Signal Hills [Member] | TOB Trust [Member] | St Paul, MN [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Month Acquired | [2] |  |  | January 2021 |
Units | Unit | [2] |  |  | 146 |
Maturity Date | [2],[3] |  |  | Aug. 01, 2023 |
Current Interest Rate | [2] |  |  | 7.37% |
Amortized Cost | [2] |  |  | $ 24,450,000 |
Governmental Issuer Loans [Member] | Hilltop at Signal Hills [Member] | TOB Trust [Member] | SOFR [Member] | St Paul, MN [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Variable Interest Rate | [2],[4] |  |  | 3.07% |
Governmental Issuer Loans [Member] | Hope on Avalon [Member] | TOB Trust [Member] | Los Angeles, CA [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Month Acquired |  | January 2021 |  | January 2021 |
Units | Unit |  | 88 |  | 88 |
Maturity Date |  | Feb. 01, 2024 | [6] | Aug. 01, 2023 | [3]
Current Interest Rate |  | 7.62% |  | 7.41% |
Amortized Cost |  | $ 23,390,000 |  | $ 23,390,000 |
Governmental Issuer Loans [Member] | Hope on Avalon [Member] | TOB Trust [Member] | SIFMA [Member] | Los Angeles, CA [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Variable Interest Rate |  | 3.75% | [7] | 3.75% | [4]
Governmental Issuer Loans [Member] | Hope on Broadway [Member] | TOB Trust [Member] | Los Angeles, CA [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Month Acquired |  |  |  | January 2021 |
Units | Unit |  |  |  | 49 |
Maturity Date | [3] |  |  | Aug. 01, 2023 |
Current Interest Rate |  |  |  | 7.41% |
Amortized Cost |  |  |  | $ 12,105,623 |
Governmental Issuer Loans [Member] | Hope on Broadway [Member] | TOB Trust [Member] | SIFMA [Member] | Los Angeles, CA [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Variable Interest Rate | [4] |  |  | 3.75% |
Governmental Issuer Loans [Member] | Osprey Village [Member] | TOB Trust [Member] | Kissimmee, FL [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Month Acquired |  | July 2021 | [5] | July 2021 | [2]
Units | Unit |  | 383 | [5] | 383 | [2]
Maturity Date |  | Aug. 01, 2024 | [5],[6] | Aug. 01, 2024 | [2],[3]
Current Interest Rate |  | 8.38% | [5] | 6.88% | [2]
Amortized Cost |  | $ 60,000,000 | [5] | $ 39,893,040 | [2]
Governmental Issuer Loans [Member] | Osprey Village [Member] | TOB Trust [Member] | SOFR [Member] | Kissimmee, FL [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Variable Interest Rate |  | 3.07% | [5],[7] | 3.07% | [2],[4]
Governmental Issuer Loans [Member] | Willow Place Apartments [Member] | TOB Trust [Member] | McDonough, GA [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Month Acquired |  | September 2021 | [5] | September 2021 | [2]
Units | Unit |  | 182 | [5] | 182 | [2]
Maturity Date |  | Oct. 01, 2024 | [5],[6] | Oct. 01, 2024 | [2],[3]
Current Interest Rate |  | 8.61% | [5] | 7.11% | [2]
Amortized Cost |  | $ 25,000,000 | [5] | $ 17,354,472 | [2]
Governmental Issuer Loans [Member] | Willow Place Apartments [Member] | TOB Trust [Member] | SOFR [Member] | McDonough, GA [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Variable Interest Rate |  | 3.30% | [5],[7] | 3.30% | [2],[4]
Governmental Issuer Loans [Member] | Willow Place Apartments Supplemental [Member] | TOB Trust [Member] | McDonough, GA [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Month Acquired |  | November 2023 |  |  |
Maturity Date | [6] | Oct. 01, 2024 |  |  |
Current Interest Rate |  | 8.76% |  |  |
Amortized Cost |  | $ 1,500,000 |  |  |
Governmental Issuer Loans [Member] | Willow Place Apartments Supplemental [Member] | TOB Trust [Member] | SOFR [Member] | McDonough, GA [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Variable Interest Rate | [7] | 3.45% |  |  |
Governmental Issuer Loans [Member] | Magnolia Heights [Member] | TOB Trust [Member] | Covington Georgia [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Month Acquired |  | June 2022 | [5] | June 2022 | [2]
Units | Unit |  | 200 | [5] | 200 | [2]
Maturity Date |  | Jul. 01, 2024 | [5],[6] | Jul. 01, 2024 | [2],[3]
Current Interest Rate |  | 9.16% | [5] | 7.66% | [2]
Amortized Cost |  | $ 20,400,000 | [5] | $ 20,400,000 | [2]
Governmental Issuer Loans [Member] | Magnolia Heights [Member] | TOB Trust [Member] | SOFR [Member] | Covington Georgia [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Variable Interest Rate |  | 3.85% | [5],[7] | 3.85% | [2],[4]
Governmental Issuer Loans [Member] | Poppy Grove I [Member] | TOB Trust [Member] | Elk Grove, CA [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Month Acquired | [8] | September 2022 | [5] | September 2022 | [2]
Units | Unit | [8] | 147 | [5] | 147 | [2]
Maturity Date | [8] | Apr. 01, 2025 | [5],[6] | Apr. 01, 2025 | [2],[3]
Variable Interest Rate | [8] | 6.78% | [5],[7] | 6.78% | [2],[4]
Current Interest Rate | [8] | 6.78% | [5] | 6.78% | [2]
Amortized Cost | [8] | $ 19,846,000 | [5] | $ 7,846,000 | [2]
Governmental Issuer Loans [Member] | Poppy Grove I I [Member] | TOB Trust [Member] | Elk Grove, CA [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Month Acquired | [8] | September 2022 | [5] | September 2022 | [2]
Units | Unit | [8] | 82 | [5] | 82 | [2]
Maturity Date | [8] | Apr. 01, 2025 | [5],[6] | Apr. 01, 2025 | [2],[3]
Variable Interest Rate | [8] | 6.78% | [5],[7] | 6.78% | [2],[4]
Current Interest Rate | [8] | 6.78% | [5] | 6.78% | [2]
Amortized Cost | [8] | $ 9,541,300 | [5] | $ 4,541,300 | [2]
Governmental Issuer Loans [Member] | Poppy Grove I I I [Member] | TOB Trust [Member] | Elk Grove, CA [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Month Acquired | [8] | September 2022 | [5] | September 2022 | [2]
Units | Unit | [8] | 158 | [5] | 158 | [2]
Maturity Date | [8] | Apr. 01, 2025 | [5],[6] | Apr. 01, 2025 | [2],[3]
Variable Interest Rate | [8] | 6.78% | [5],[7] | 6.78% | [2],[4]
Current Interest Rate | [8] | 6.78% | [5] | 6.78% | [2]
Amortized Cost | [8] | $ 16,550,000 | [5] | $ 8,550,000 | [2]
Governmental Issuer Loans [Member] | Sandy Creek Apartments [Member] | TOB Trust [Member] | Bryan, Texas [Member] |  |  |  |  |
Governmental Issuer Loans [Line Items] |  |  |  |  |
Month Acquired | [5] | August 2023 |  |  |
Units | Unit | [5] | 140 |  |  |
Maturity Date | [5],[6] | Sep. 01, 2026 |  |  |
Variable Interest Rate | [5],[7],[9] | 7.83% |  |  |
Current Interest Rate | [5] | 7.83% |  |  |
Amortized Cost | [5] | $ 12,100,000 |  |  |
[1] | The borrower has the option to extend the maturity up to six months upon payment of a non-refundable extension fee.
[2] | The Freddie Mac servicer that has forward committed to purchase the GIL at maturity is an affiliate of the Partnership (Note 23).
[3] | The borrowers may elect to extend the maturity dates by six months upon meeting certain conditions, which may include payment of a non-refundable extension fee
[4] | The variable index interest rate components are typically subject to floors that range from 0% to 0.85%.
[5] | The Freddie Mac servicer that has forward committed to purchase the GIL at maturity is an affiliate of the Partnership (Note 23).
[6] | The borrowers may elect to extend the maturity dates by six months upon meeting certain conditions, which may include payment of a non-refundable extension fee.
[7] | The variable index interest rate components are typically subject to floors that range from 0% to 0.85%.
[8] | The Partnership has agreed to provide a subordinate GIL after the execution of Freddie Mac’s forward purchase commitment if needed by the property. The potential subordinate GIL amounts are up to $3.8 million, $2.2 million, and $4.2 million for Poppy Grove I, Poppy Grove II, and Poppy Grove III, respectively.
[9] | The interest rate will convert to a variable rate of Term SOFR + 2.80% on February 1, 2025.

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