Transactions with Related Parties - Summary of Transactions Between Borrowers of Partnership's MRBs and Affiliates (Details) - General Partner [Member] - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Non-partnership property administrative fee received	[1]	$ 9,000	$ 17,000	$ 27,000	$ 60,000
Investment/mortgage fees received	[2]		1,189,000	$ 822,000	2,787,000
Mortgage Revenue Bonds [Member]
Redemption administrative fee	[3]		$ 114,000		$ 114,000

[1] AFCA 2 received administrative fees directly from the owners of certain properties financed by certain MRBs held by the Partnership.  These administrative fees equal 0.45% per annum of the outstanding principal balance of the MRBs. These amounts represent administrative fees received by AFCA 2 during the periods specified.

[2] AFCA 2 received placement fees in connection with the acquisition of certain MRBs and investments in unconsolidated entities.

[3] AFCA 2 received a one-time administrative fee related to early redemption of the Lake Forest MRB from the property in September 2018.