Investments - Schedule of Details of Properties Acquired (Details) (Parenthetical) - Southeast Affordable Housing Portfolio	9 Months Ended
	Sep. 30, 2020
Orlando, FL [Member]
Real Estate Properties [Line Items]
Percentage of number of units acquired	25.00%
Jacksonville, FL [Member]
Real Estate Properties [Line Items]
Percentage of number of units acquired	24.00%
Newport News, VA [Member]
Real Estate Properties [Line Items]
Percentage of number of units acquired	11.00%
Tucson, AZ [Member]
Real Estate Properties [Line Items]
Percentage of number of units acquired	8.00%
Charlotte, NC [Member]
Real Estate Properties [Line Items]
Percentage of number of units acquired	7.00%
Raleigh, NC [Member]
Real Estate Properties [Line Items]
Percentage of number of units acquired	6.00%