Schedule IV (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	8.58%	8.50%
Deferred interest rate	3.53%	3.91%
Prior Liens	$ 0
Face Amount of Mortgages (in thousands)	268,222,000
Carrying Amount of Mortgages (in thousands)	196,420,000
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Gross	206,270,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	(1,755,000)	$ (1,194,000)
Loans and Leases Receivable, Allowance	$ (8,095,000)	$ (9,067,000)
Periodic Payment Terms One
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	850.00%
Deferred interest rate	300.00%
Periodic Payment Terms Two
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	800.00%
Deferred interest rate	500.00%
Periodic Payment Terms Three
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	850.00%
Deferred interest rate	550.00%
Periodic Payment Terms Four
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	850.00%
Deferred interest rate	350.00%
Periodic Payment Terms Five
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	850.00%
Deferred interest rate	400.00%
Periodic Payment Terms Six
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	850.00%
Deferred interest rate	450.00%
Newbergh [Member] | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	8.50%
Deferred interest rate	5.50%
Newbergh Capital [Member] | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	8.50%
Deferred interest rate	5.50%
V And Three [Member] | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	8.50%
Deferred interest rate	5.00%
V And Three Capital [Member] | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	8.50%
Deferred interest rate	5.00%
Cameron Park [Member] | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	8.50%
Deferred interest rate	3.00%
Cameron Park Capital [Member] | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	8.50%
Deferred interest rate	3.00%
The Anson [Member] | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	8.50%
Deferred interest rate	4.50%
The Anson Capital [Member] | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	8.50%
Deferred interest rate	4.50%
Berryessa [Member] | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	11.50%
Current interest rate	8.50%
Deferred interest rate	3.00%
Prior Liens	$ 0
Face Amount of Mortgages (in thousands)	137,616,000
Carrying Amount of Mortgages (in thousands)	136,061,000
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	$ 0
Southpoint [Member] | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	8.50%
Deferred interest rate	4.00%
Southpoint Capital [Member] | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	8.50%
Deferred interest rate	4.00%
Prior Liens	$ 0
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	$ 0
Vintage Destin [Member] | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	8.50%
Deferred interest rate	4.00%
Prior Liens	$ 0
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	$ 0
Hidden River II [Member] | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	8.50%
Deferred interest rate	3.50%
Prior Liens	$ 0
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	$ 0
Hidden River II Capital [Member] | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	8.50%
Deferred interest rate	3.50%
Prior Liens	$ 0
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	$ 0
Vintage Horizon West [Member] | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	14.00%
Current interest rate	8.50%
Deferred interest rate	5.50%
Face Amount of Mortgages (in thousands)	$ 10,900,000
Carrying Amount of Mortgages (in thousands)	$ 9,828,000
Kennesaw Crossing [Member] | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	8.50%
Deferred interest rate	5.50%
Carrying Amount of Mortgages (in thousands)	$ (8,095,000)
Vintage Jones Franklin [Member] | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	14.00%
Current interest rate	8.50%
Deferred interest rate	5.50%
Prior Liens	$ 0
Face Amount of Mortgages (in thousands)	10,000,000
Carrying Amount of Mortgages (in thousands)	8,989,000
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	$ 0
Solis Cumming Town Center [Member] | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	14.00%
Current interest rate	8.50%
Deferred interest rate	5.50%
Prior Liens	$ 0
Face Amount of Mortgages (in thousands)	20,681,000
Carrying Amount of Mortgages (in thousands)	18,153,000
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	$ 0
Solis Chestnut Farm [Member] | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	8.50%
Deferred interest rate	5.50%
8 West [Member] | Office Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Current interest rate	8.50%
Deferred interest rate	5.00%
One Nexton | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	11.00%
Face Amount of Mortgages (in thousands)	$ 6,265,000
Carrying Amount of Mortgages (in thousands)	$ 6,265,000
hudson metro west | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	13.00%
Face Amount of Mortgages (in thousands)	$ 16,791,000
Carrying Amount of Mortgages (in thousands)	$ 13,873,000
oxford club drive | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	13.00%
Face Amount of Mortgages (in thousands)	$ 23,150,000
Carrying Amount of Mortgages (in thousands)	$ 5,551,000
menlo II | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	12.00%
Face Amount of Mortgages (in thousands)	$ 16,610,000
Carrying Amount of Mortgages (in thousands)	$ 4,500,000
beaver ruin | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	13.00%
Face Amount of Mortgages (in thousands)	$ 9,133,000
Carrying Amount of Mortgages (in thousands)	$ 0
populus at pooler | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	12.75%
Face Amount of Mortgages (in thousands)	$ 15,907,000
Carrying Amount of Mortgages (in thousands)	$ 2,104,000
populus at pooler capital | Apartment Building [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	12.75%
Face Amount of Mortgages (in thousands)	$ 1,169,000
Carrying Amount of Mortgages (in thousands)	$ 946,000