Counterparty Risks (% Of Total Receivable For Securities Sold) (Details)	Jun. 30, 2012
CS First Boston [Member]
% of Total Receivable for Securities Sold	35.00%
Royal Bank Of Scotland [Member]
% of Total Receivable for Securities Sold	26.00%

Percentage of total receivables for securities sold due from a specific counterparty above a specified concentration risk threshold.

No definition available.

Name:	efc_PercentageOfTotalReceivableForSecuritiesSold
Namespace Prefix:	efc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant