Commitments and Contingencies - Summary of Partnership's Total and Remaining Commitments (Details)	6 Months Ended
	Jun. 30, 2022 USD ($)
Commitments And Other Guarantees [Line Items]
Total Initial Commitment	$ 537,644,843
Remaining Commitments as of June 30, 2022	286,148,503
Mortgage Revenue Bonds and Taxable Mortgage Revenue Bonds [Member]
Commitments And Other Guarantees [Line Items]
Total Initial Commitment	116,000,000
Remaining Commitments as of June 30, 2022	$ 90,900,000
Mortgage Revenue Bonds and Taxable Mortgage Revenue Bonds [Member] | Ocotillo Springs [Member] | Series A T Mortgage [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2020-07
Maturity Date	2023-08
Total Initial Commitment	$ 7,000,000
Remaining Commitments as of June 30, 2022	$ 2,300,000
Mortgage Revenue Bonds and Taxable Mortgage Revenue Bonds [Member] | Ocotillo Springs [Member] | Series A T Mortgage [Member] | LIBOR [Member]
Commitments And Other Guarantees [Line Items]
Interest Rate	3.55%
Mortgage Revenue Bonds and Taxable Mortgage Revenue Bonds [Member] | The Residency At Mayer [Member] | Series A [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2021-10
Maturity Date	2039-04
Total Initial Commitment	$ 29,500,000
Remaining Commitments as of June 30, 2022	$ 4,500,000
Mortgage Revenue Bonds and Taxable Mortgage Revenue Bonds [Member] | The Residency At Mayer [Member] | Series A [Member] | SOFR [Member]
Commitments And Other Guarantees [Line Items]
Interest Rate	3.60%
Mortgage Revenue Bonds and Taxable Mortgage Revenue Bonds [Member] | The Residency At Mayer [Member] | Series A T Mortgage [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2021-10
Maturity Date	2024-04
Total Initial Commitment	$ 12,500,000
Remaining Commitments as of June 30, 2022	$ 11,500,000
Mortgage Revenue Bonds and Taxable Mortgage Revenue Bonds [Member] | The Residency At Mayer [Member] | Series A T Mortgage [Member] | SOFR [Member]
Commitments And Other Guarantees [Line Items]
Interest Rate	3.70%
Mortgage Revenue Bonds and Taxable Mortgage Revenue Bonds [Member] | The Residency at the Entrepreneur [Member] | Series J-3 [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2022-04
Maturity Date	2040-03
Interest Rate	6.00%
Total Initial Commitment	$ 26,080,000
Remaining Commitments as of June 30, 2022	$ 26,080,000
Mortgage Revenue Bonds and Taxable Mortgage Revenue Bonds [Member] | The Residency at the Entrepreneur [Member] | Series J-4 [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2022-04
Maturity Date	2040-03
Total Initial Commitment	$ 16,420,000
Remaining Commitments as of June 30, 2022	$ 16,420,000
Mortgage Revenue Bonds and Taxable Mortgage Revenue Bonds [Member] | The Residency at the Entrepreneur [Member] | Series J-4 [Member] | SOFR [Member]
Commitments And Other Guarantees [Line Items]
Interest Rate	3.60%
Mortgage Revenue Bonds and Taxable Mortgage Revenue Bonds [Member] | The Residency at the Entrepreneur [Member] | Series J-T [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2022-04
Maturity Date	2025-04
Total Initial Commitment	$ 13,000,000
Remaining Commitments as of June 30, 2022	$ 12,000,000
Mortgage Revenue Bonds and Taxable Mortgage Revenue Bonds [Member] | The Residency at the Entrepreneur [Member] | Series J-T [Member] | SOFR [Member]
Commitments And Other Guarantees [Line Items]
Interest Rate	3.65%
Mortgage Revenue Bonds and Taxable Mortgage Revenue Bonds [Member] | Meadow Valley [Member] | Series A [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2021-12
Maturity Date	2029-12
Interest Rate	6.25%
Total Initial Commitment	$ 44,000,000
Remaining Commitments as of June 30, 2022	43,900,000
Taxable Mortgage Revenue Bonds [Member]
Commitments And Other Guarantees [Line Items]
Total Initial Commitment	32,500,000
Remaining Commitments as of June 30, 2022	25,800,000
Governmental Issuer Loans and Taxable Governmental Issuer Loans [Member]
Commitments And Other Guarantees [Line Items]
Total Initial Commitment	140,895,623
Remaining Commitments as of June 30, 2022	$ 65,590,274
Governmental Issuer Loans and Taxable Governmental Issuer Loans [Member] | Hope on Avalon (Taxable) [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2021-01
Maturity Date	2023-02
Total Initial Commitment	$ 10,573,000
Remaining Commitments as of June 30, 2022	$ 9,573,000
Governmental Issuer Loans and Taxable Governmental Issuer Loans [Member] | Hope on Avalon (Taxable) [Member] | SOFR [Member]
Commitments And Other Guarantees [Line Items]
Interest Rate	3.55%
Governmental Issuer Loans and Taxable Governmental Issuer Loans [Member] | Hope on Avalon [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2021-01
Maturity Date	2023-02
Total Initial Commitment	$ 23,390,000
Remaining Commitments as of June 30, 2022	$ 6,408,800
Governmental Issuer Loans and Taxable Governmental Issuer Loans [Member] | Hope on Avalon [Member] | SIFMA [Member]
Commitments And Other Guarantees [Line Items]
Interest Rate	3.75%
Governmental Issuer Loans and Taxable Governmental Issuer Loans [Member] | Hope on Broadway [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2021-01
Maturity Date	2023-02
Total Initial Commitment	$ 12,105,623
Remaining Commitments as of June 30, 2022	$ 1,414,378
Governmental Issuer Loans and Taxable Governmental Issuer Loans [Member] | Hope on Broadway [Member] | SIFMA [Member]
Commitments And Other Guarantees [Line Items]
Interest Rate	3.75%
Governmental Issuer Loans and Taxable Governmental Issuer Loans [Member] | Osprey Village [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2021-07
Maturity Date	2024-08
Total Initial Commitment	$ 60,000,000
Remaining Commitments as of June 30, 2022	$ 35,636,873
Governmental Issuer Loans and Taxable Governmental Issuer Loans [Member] | Osprey Village [Member] | SOFR [Member]
Commitments And Other Guarantees [Line Items]
Interest Rate	3.07%
Governmental Issuer Loans and Taxable Governmental Issuer Loans [Member] | Willow Place Apartments [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2021-09
Maturity Date	2024-10
Total Initial Commitment	$ 25,000,000
Remaining Commitments as of June 30, 2022	$ 16,531,137
Governmental Issuer Loans and Taxable Governmental Issuer Loans [Member] | Willow Place Apartments [Member] | SOFR [Member]
Commitments And Other Guarantees [Line Items]
Interest Rate	3.30%
Governmental Issuer Loans and Taxable Governmental Issuer Loans [Member] | Magnolia Heights [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2022-06
Maturity Date	2024-07
Total Initial Commitment	$ 20,400,000
Remaining Commitments as of June 30, 2022	$ 5,599,086
Governmental Issuer Loans and Taxable Governmental Issuer Loans [Member] | Magnolia Heights [Member] | SOFR [Member]
Commitments And Other Guarantees [Line Items]
Interest Rate	3.85%
Taxable Governmental Issuer Loans [Member]
Commitments And Other Guarantees [Line Items]
Total Initial Commitment	$ 10,573,000
Remaining Commitments as of June 30, 2022	$ 9,573,000
Property Loans [Member] | Hilltop at Signal Hills [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2021-01
Maturity Date	2023-08
Total Initial Commitment	$ 21,197,939
Remaining Commitments as of June 30, 2022	$ 5,838,631
Property Loans [Member] | Hilltop at Signal Hills [Member] | SOFR [Member]
Commitments And Other Guarantees [Line Items]
Interest Rate	3.07%
Property Loans [Member] | Legacy Commons at Signal Hills [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2021-01
Maturity Date	2024-02
Total Initial Commitment	$ 32,233,972
Remaining Commitments as of June 30, 2022	$ 8,884,337
Property Loans [Member] | Legacy Commons at Signal Hills [Member] | SOFR [Member]
Commitments And Other Guarantees [Line Items]
Interest Rate	3.07%
Property Loans [Member] | Osprey Village [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2021-07
Maturity Date	2024-08
Total Initial Commitment	$ 25,500,000
Remaining Commitments as of June 30, 2022	$ 24,500,000
Property Loans [Member] | Osprey Village [Member] | SOFR [Member]
Commitments And Other Guarantees [Line Items]
Interest Rate	3.07%
Property Loans [Member] | Willow Place Apartments [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2021-09
Maturity Date	2024-10
Total Initial Commitment	$ 21,351,328
Remaining Commitments as of June 30, 2022	$ 20,351,328
Property Loans [Member] | Willow Place Apartments [Member] | SOFR [Member]
Commitments And Other Guarantees [Line Items]
Interest Rate	3.30%
Property Loans [Member] | Magnolia Heights [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2022-06
Maturity Date	2024-07
Total Initial Commitment	$ 10,300,000
Remaining Commitments as of June 30, 2022	$ 9,300,000
Property Loans [Member] | Magnolia Heights [Member] | SOFR [Member]
Commitments And Other Guarantees [Line Items]
Interest Rate	3.85%
Property Loans [Member] | Scharbauer Flats Apartments [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2020-06
Maturity Date	2023-01
Total Initial Commitment	$ 24,160,000
Remaining Commitments as of June 30, 2022	$ 3,519,106
Property Loans [Member] | Scharbauer Flats Apartments [Member] | LIBOR [Member]
Commitments And Other Guarantees [Line Items]
Interest Rate	2.85%
Property Loans [Member] | Oasis at Twin Lakes [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2020-07
Maturity Date	2023-08
Total Initial Commitment	$ 27,704,180
Remaining Commitments as of June 30, 2022	$ 3,685,523
Property Loans [Member] | Oasis at Twin Lakes [Member] | LIBOR [Member]
Commitments And Other Guarantees [Line Items]
Interest Rate	2.50%
Property Loans [Member] | Centennial Crossings [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2020-08
Maturity Date	2023-09
Total Initial Commitment	$ 24,250,000
Remaining Commitments as of June 30, 2022	$ 2,230,428
Property Loans [Member] | Centennial Crossings [Member] | LIBOR [Member]
Commitments And Other Guarantees [Line Items]
Interest Rate	2.50%
Property Loans [Member] | Magnolia Crossing [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2021-12
Maturity Date	2022-12
Total Initial Commitment	$ 14,500,000
Remaining Commitments as of June 30, 2022	$ 608,262
Property Loans [Member] | Magnolia Crossing [Member] | SOFR [Member]
Commitments And Other Guarantees [Line Items]
Interest Rate	6.50%
Joint Venture Investments [Member]
Commitments And Other Guarantees [Line Items]
Total Initial Commitment	$ 32,578,801
Remaining Commitments as of June 30, 2022	$ 11,467,614
Joint Venture Investments [Member] | Vantage at Hutto [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2020-11
Total Initial Commitment	$ 11,233,000
Remaining Commitments as of June 30, 2022	$ 1,136,576
Joint Venture Investments [Member] | Vantage at San Marcos [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2020-11
Total Initial Commitment	$ 9,914,529
Remaining Commitments as of June 30, 2022	8,943,914
Joint Venture Investments [Member] | Vantage at Loveland [Member]
Commitments And Other Guarantees [Line Items]
Total Initial Commitment	201,197,419
Remaining Commitments as of June 30, 2022	$ 78,917,615
Joint Venture Investments [Member] | Vantage at McKinney Falls [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2021-12
Total Initial Commitment	$ 11,431,272
Remaining Commitments as of June 30, 2022	1,387,124
Bond Purchase Commitment [Member]
Commitments And Other Guarantees [Line Items]
Total Initial Commitment	3,900,000
Remaining Commitments as of June 30, 2022	$ 3,900,000
Bond Purchase Commitment [Member] | Anaheim & Walnut [Member]
Commitments And Other Guarantees [Line Items]
Commitment Date	2021-09
Maturity Date	Q3 2024
Interest Rate	4.85%
Total Initial Commitment	$ 3,900,000
Remaining Commitments as of June 30, 2022	$ 3,900,000