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Mortgage Loans Held for Investment, at Fair Value (Schedule of Acquisition of Mortgage Loans) (Details) (USD $)
 0 Months Ended 12 Months Ended
Mar. 27, 2014
Aug. 28, 2013
Jul. 25, 2013
May 30, 2013
May 31, 2013
Mar. 22, 2013
Dec. 31, 2014
Mortgage Loans on Real Estate [Line Items]              
Unpaid principal balance of loans acquired $ 100,400,000us-gaap_MortgageLoansOnRealEstateOtherAdditions $ 98,200,000us-gaap_MortgageLoansOnRealEstateOtherAdditions $ 162,400,000us-gaap_MortgageLoansOnRealEstateOtherAdditions    $ 134,500,000us-gaap_MortgageLoansOnRealEstateOtherAdditions $ 17,700,000us-gaap_MortgageLoansOnRealEstateOtherAdditions  
Utilization of facility       10,600,000us-gaap_ProceedsFromLinesOfCredit      
Newly Originated Mortgage Loans [Member]              
Mortgage Loans on Real Estate [Line Items]              
Unpaid principal balance of loans acquired             767,000us-gaap_MortgageLoansOnRealEstateOtherAdditions
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= zfc_NewlyOriginatedMortgageLoansMember
Loan Repurchase Facility [Member]              
Mortgage Loans on Real Estate [Line Items]              
Utilization of facility 60,600,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember		 54,800,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember		 98,700,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember		    [1] 78,500,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember		     
Loan Repurchase Facility [Member] | Newly Originated Mortgage Loans [Member]              
Mortgage Loans on Real Estate [Line Items]              
Utilization of facility             $ 690,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= zfc_NewlyOriginatedMortgageLoansMember
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
[1] On May 30, 2013, the Company entered into the Citi Loan Repurchase Facility and utilized $10.6 million of the Citi Loan Repurchase Facility to finance its then existing residential mortgage loan portfolio.