v3.19.1

Counterparty Risk (% of Total Receivable for Securities Sold) (Details)	Dec. 31, 2018
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

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: