Mortgage Revenue Bonds - Summary of Changes in Partnership's Allowance for Credit Losses (Details) - Mortgage Revenue Bonds [Member] - USD ($)		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Allowance for Credit Loss [Abstract]
Balance, beginning of period		$ 7,319,000	$ 0
Provision for credit loss		0	1,358,000
Balance, end of period	[1]	$ 7,319,000	$ 1,358,000

[1] ^{The allowance for credit losses as of March 31, 2021 is related to the Provision Center 2014-1 MRB and the Live 929 Apartments MRB.}