Investments in Real Estate Related Securities - Summary of Investments in Real Estate-Related Debt Securities (Parenthetical) (Details)	Sep. 30, 2020
CMBS
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Floating coupon rate	5.76%
Minimum [Member] | RMBS
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Floating coupon rate	0.00%
Maximum | RMBS
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Floating coupon rate	7.95%