Real Estate Securities - Summary of Significant Valuation Assumptions for Available for Sale Securities (Details) - Subordinate Securities	12 Months Ended
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Default rate	0.50%
Loss severity	23.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration