Other Assets - Summary of Taxable MRB Acquired (Parenthetical) (Details) - Taxable MRB [Member] - Ocotillo Springs [Member] - Series A-T [Member] - Brawley, CA [Member]	12 Months Ended
	Dec. 31, 2020 USD ($)
Mortgage Loans On Real Estate [Line Items]
Maximum funding commitment	$ 7,000,000.0
Funds advanced	$ 0
LIBOR [Member]
Mortgage Loans On Real Estate [Line Items]
Description of variable interest rate basis	1-month LIBOR
Variable interest rate basis spread	3.55%
Variable interest floor rate, percentage	4.91%