v3.20.4

Counterparty Risk (% of Total Receivable for Securities Sold) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Concentration Risk [Line Items] |  |
Concentration risk threshold | 15.00% | 15.00%
J.P. Morgan Securities LLC [Member] |  |
Concentration Risk [Line Items] |  |
% of Total Receivable for Securities Sold |  | 25.00%
Bank of America Securities [Member] |  |
Concentration Risk [Line Items] |  |
% of Total Receivable for Securities Sold |  | 26.00%
CS First Boston Limited [Member] |  |
Concentration Risk [Line Items] |  |
% of Total Receivable for Securities Sold |  | 34.00%

X
- Definition Threshold used by the Company to determine disclosure of counterparty concentration risk. + References No definition available. + Details
Name: | efc_ConcentrationRiskTreshold
Namespace Prefix: | efc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of total receivables for securities sold due from a specific counterparty above a specified concentration risk threshold. + References No definition available. + Details
Name: | efc_PercentageOfTotalReceivableForSecuritiesSold
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_J.P.MorganSecuritiesLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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