Transactions with Related Parties - Summary of Transactions Between Borrowers of Partnership's MRBs and Affiliates (Details) - General Partner [Member] - USD ($)		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Non-partnership property administrative fee received	[1]	$ 36,000	$ 36,000
Investment/mortgage fees received	[2]	$ 2,277,000	$ 1,362,000

[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. The disclosed 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, GILs, property loans, and investments in unconsolidated entities.