Real Estate Securities - Summary of Significant Valuation Assumptions for Available for Sale Securities (Details) - Prime	9 Months Ended
Sep. 30, 2019
Minimum
Debt Securities, Available-for-sale [Line Items]
Prepayment rates	15.00%
Projected losses	1.00%
Maximum
Debt Securities, Available-for-sale [Line Items]
Prepayment rates	15.00%
Projected losses	1.00%

This item represents the default rate of the underlying assets in the security that were considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563

Name:	us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureOtherDefaultRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration