v3.8.0.1

Organization and Investment Objective Narrative (Details) | Sep. 30, 2017
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Parent [Member] |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |
Ownership Percentage | 99.40%

X
- Definition [Line Items] for Organization, Consolidation and Presentation of Financial Statements [Table] + References No definition available. + Details
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Namespace Prefix: | efc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage ownership of the Operating Partnership as a percentage of total shares and convertible units. + References No definition available. + Details
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Namespace Prefix: | efc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_ParentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |