Counterparty Risk (% Of Total Collateral On Reverse Repurchase Agreements) (Details) (Royal Bank of Canada [Member])	Sep. 30, 2014
Royal Bank of Canada [Member]
Concentration Risk [Line Items]
% of Total Collateral on Reverse Repurchase Agreements	19.00%

Percentage of total collateral on reverse repurchase agreements held by a specific counterparty above a specified concentration risk threshold.

No definition available.

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