Mortgage Revenue Bonds - Schedule of MRBs Redeemed (Details)	3 Months Ended
	Mar. 31, 2026 USD ($) Unit	Mar. 31, 2025 USD ($) Unit
Windsor Shores Apartments [Member] \| Columbia, SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Units \| Unit	176
Redemption of Mortgage Revenue Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Principal Outstanding at Date of Redemption \| $	$ 117,130,000
Redemption of Mortgage Revenue Bonds [Member] \| The Park at Sondrio [Member] \| Greenville, SC [Member] \| Series 2022A [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed	January 2026
Units \| Unit	271
Original Maturity Date	Jan. 01, 2030
Interest Rate	6.50%
Principal Outstanding at Date of Redemption \| $	$ 38,100,000
Redemption of Mortgage Revenue Bonds [Member] \| The Park at Vietti [Member] \| Spartanburg, SC [Member] \| Series 2022A [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed	January 2026
Units \| Unit	204
Original Maturity Date	Jan. 01, 2030
Interest Rate	6.50%
Principal Outstanding at Date of Redemption \| $	$ 26,985,000
Redemption of Mortgage Revenue Bonds [Member] \| Windsor Shores Apartments [Member] \| Columbia, SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed	February 2026
Units \| Unit	176
Original Maturity Date	Feb. 01, 2030
Interest Rate	6.50%
Principal Outstanding at Date of Redemption \| $	$ 21,545,000
Redemption of Mortgage Revenue Bonds [Member] \| The Ivy Apartments (a/k/a Century Plaza Apartments) [Member] \| Greenville, SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed	February 2026
Units \| Unit	212
Original Maturity Date	Feb. 01, 2030
Interest Rate	6.50%
Principal Outstanding at Date of Redemption \| $	$ 30,500,000
Redemption of Mortgage Revenue Bonds [Member] \| Lutheran Gardens [Member] \| Compton, CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed		March 2025
Units \| Unit		76
Original Maturity Date		Feb. 01, 2025
Interest Rate		4.90%
Principal Outstanding at Date of Redemption \| $		$ 10,352,000