v3.20.4

Counterparty Risk (% of Total Collateral on Reverse Repurchase Agreements) (Details) | Dec. 31, 2018
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Royal Bank of Canada [Member] |
Concentration Risk [Line Items] |
Percentage of Total Collateral On Reverse Repurchase Agreements | 19.00%

X
- Definition Percentage of total collateral on reverse repurchase agreements held by a specific counterparty that is above a specified concentration risk threshold. + References No definition available. + Details
Name: | efc_PercentageofTotalCollateralOnReverseRepurchaseAgreements
Namespace Prefix: | efc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition 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. + References No definition available. + Details
Name: | us-gaap_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_CounterpartyNameAxis=efc_RoyalBankofCanadaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |