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Related Party Transactions (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Related Party Transaction [Line Items]      
Advisory fee - related party $ 2,853,896us-gaap_SponsorFees $ 2,629,815us-gaap_SponsorFees $ 877,825us-gaap_SponsorFees
GMFS, LLC [Member]      
Related Party Transaction [Line Items]      
Related party revenue 1,200us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= zfc_GmfsLlcMember
   
Related party receivables 1,200us-gaap_DueFromRelatedParties
/ dei_LegalEntityAxis
= zfc_GmfsLlcMember
   
ZAIS REIT Management, LLC [Member] | Advisory Fee [Member]      
Related Party Transaction [Line Items]      
Advisory fee, rate 1.50%zfc_RelatedPartyTransactionAdvisoryFeeRate
/ us-gaap_RelatedPartyTransactionAxis
= zfc_AdvisoryFeeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedLiabilityCompanyMember
   
Advisory fee - related party 2,900,000us-gaap_SponsorFees
/ us-gaap_RelatedPartyTransactionAxis
= zfc_AdvisoryFeeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedLiabilityCompanyMember
2,600,000us-gaap_SponsorFees
/ us-gaap_RelatedPartyTransactionAxis
= zfc_AdvisoryFeeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedLiabilityCompanyMember
900,000us-gaap_SponsorFees
/ us-gaap_RelatedPartyTransactionAxis
= zfc_AdvisoryFeeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedLiabilityCompanyMember
Advisory fees due to related party 700,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionAxis
= zfc_AdvisoryFeeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedLiabilityCompanyMember
   
ZAIS REIT Management, LLC [Member] | Loan Sourcing Fee [Member]      
Related Party Transaction [Line Items]      
Advisory fee, rate 0.50%zfc_RelatedPartyTransactionAdvisoryFeeRate
/ us-gaap_RelatedPartyTransactionAxis
= zfc_LoanSourcingFeeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedLiabilityCompanyMember
   
Advisory fee - related party $ 3,835us-gaap_SponsorFees
/ us-gaap_RelatedPartyTransactionAxis
= zfc_LoanSourcingFeeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedLiabilityCompanyMember