Mortgage Revenue Bonds - Summary of Changes in Partnership's Allowance for Credit Losses (Details) - Mortgage Revenue Bonds [Member] - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Allowance for Credit Loss [Abstract]
Balance, beginning of period		$ 7,319,000	$ 1,358,000	$ 7,319,000	$ 0
Provision for credit loss		900,000	465,000	900,000	1,823,000
Balance, end of period	[1]	$ 8,219,000	$ 1,823,000	$ 8,219,000	$ 1,823,000

[1] The allowance for credit losses as of June 30, 2021 is related to the Provision Center 2014-1 MRB and the Live 929 Apartments MRB.