Mortgage Revenue Bonds - Schedule of MRBs Acquisitions (Parenthetical) (Details) - USD ($)	Sep. 30, 2022	Sep. 30, 2021
Schedule Of Available For Sale Securities [Line Items]
Committed to funding amount	$ 554,917,871
Jackson MS [Member]
Schedule Of Available For Sale Securities [Line Items]
Commitment to provide maximum funding of taxable MRB		$ 6,900,000
Maximum balance of the MRB after stabilization		$ 4,800,000
Mortgage Revenue Bonds [Member] | Residency at the Entrepreneur [Member] | CA
Schedule Of Available For Sale Securities [Line Items]
Floor rate	3.87%
Mortgage Revenue Bonds [Member] | Series J-3 [Member] | Residency at the Entrepreneur [Member] | CA
Schedule Of Available For Sale Securities [Line Items]
Commitment to provide maximum funding of taxable MRB	$ 26,100,000
Mortgage Revenue Bonds [Member] | Series J-4 [Member] | Residency at the Entrepreneur [Member] | CA
Schedule Of Available For Sale Securities [Line Items]
Commitment to provide maximum funding of taxable MRB	16,400,000
Maximum balance of the MRB after stabilization	$ 1,500,000
Fixed interest rate	8.00%