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Counterparty Risk (% Of Total Receivable For Securities Sold) (Details)
Mar. 31, 2015
CS First Boston [Member]  
Concentration Risk [Line Items]  
% of Total Receivable for Securities Sold 35.00%efc_PercentageOfTotalReceivableForSecuritiesSold
/ efc_CounterpartyReceivableForSecuritiesSoldConcentrationAxis
= efc_CsFirstBostonMember
Citigroup [Member]  
Concentration Risk [Line Items]  
% of Total Receivable for Securities Sold 20.00%efc_PercentageOfTotalReceivableForSecuritiesSold
/ efc_CounterpartyReceivableForSecuritiesSoldConcentrationAxis
= efc_CitigroupMember