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Counterparty Risk (Cash and Cash Equivalents) (Details)
Mar. 31, 2015
Dec. 31, 2014
BlackRock Liquidity Temp Fund [Member]    
Concentration Risk [Line Items]    
Concentration risk percentage, cash and cash equivalents 32.00%efc_Concentrationriskpercentagecashandcashequivalents
/ us-gaap_CounterpartyNameAxis
= efc_BlackRockLiquidityTempFundMember		 88.00%efc_Concentrationriskpercentagecashandcashequivalents
/ us-gaap_CounterpartyNameAxis
= efc_BlackRockLiquidityTempFundMember
Bank of New York Mellon Corporation [Member]    
Concentration Risk [Line Items]    
Concentration risk percentage, cash and cash equivalents 67.00%efc_Concentrationriskpercentagecashandcashequivalents
/ us-gaap_CounterpartyNameAxis
= efc_BankofNewYorkMellonCorporationMember		 11.00%efc_Concentrationriskpercentagecashandcashequivalents
/ us-gaap_CounterpartyNameAxis
= efc_BankofNewYorkMellonCorporationMember
US Bank [Member]    
Concentration Risk [Line Items]    
Concentration risk percentage, cash and cash equivalents 1.00%efc_Concentrationriskpercentagecashandcashequivalents
/ us-gaap_CounterpartyNameAxis
= efc_USBankMember		 1.00%efc_Concentrationriskpercentagecashandcashequivalents
/ us-gaap_CounterpartyNameAxis
= efc_USBankMember