Organization and Investment Objective Narrative (Details)	Mar. 31, 2018
Parent [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Ownership Percentage	99.30%

[Line Items] for Organization, Consolidation and Presentation of Financial Statements [Table]

No definition available.

Name:	efc_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems
Namespace Prefix:	efc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration