Mortgage Revenue Bonds - Schedule of MRBs Acquisitions (Parenthetical) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Jackson Manor Apartments [Member] | Jackson, MS [Member]
Schedule Of Available For Sale Securities [Line Items]
Commitment to provide maximum funding of MRB	$ 6,900,000
Maximum balance of the MRB after stabilization	4,800,000
Residency at the Mayer [Member] | Hollywood, CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Commitment to provide maximum funding of MRB	29,500,000
Maximum balance of the MRB after stabilization	18,100,000
Meadow Valley [Member] | Garfield Charter Township, MI [Member]
Schedule Of Available For Sale Securities [Line Items]
Commitment to provide maximum funding of MRB	44,000,000.0
Live929 Apartments [Member] | Baltimore, MD [Member]
Schedule Of Available For Sale Securities [Line Items]
Discount on purchase of outstanding principal Mrb	4,300,000
Purchase price of bond	$ 17,300,000
Loan financing variable interest rate	69.50%
Variable Interest Rate	1.80%
SOFR [Member] | Residency at the Mayer [Member] | Hollywood, CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Floor rate	0.25%
Mortgage Revenue Bonds [Member] | Ocotillo Springs [Member] | Brawley, CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Maximum amount committed to fund		$ 15,000,000.0
Maximum balance of mortgage revenue bonds after stabilization		$ 3,500,000
Mortgage Revenue Bonds [Member] | LIBOR [Member] | Ocotillo Springs [Member] | Brawley, CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Variable Interest Rate		3.25%
Floor rate		4.55%
Fixed interest rate		4.35%