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Mortgage Loans Held for Investment, at Fair Value (Schedule of Mortgage Loans at Fair Value) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Mortgage Loans [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value $ 415,959,838us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_MortgageReceivablesMember		 $ 331,785,542us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_MortgageReceivablesMember
Unpaid Principal Balance 464,877,028us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_MortgageReceivablesMember		 398,828,497us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_MortgageReceivablesMember
Difference (48,917,190)us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_MortgageReceivablesMember		 (67,042,955)us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_MortgageReceivablesMember
Distressed and Re-performing Loans [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value 415,173,162us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember		 331,785,542us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
Unpaid Principal Balance 464,110,063us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember		 398,828,497us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
Difference (48,936,901)us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember		 (67,042,955)us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
Distressed and Re-performing Loans [Member] | Fixed [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value 239,154,443us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember		 173,455,340us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember
Unpaid Principal Balance 265,306,697us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember		 212,701,494us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember
Difference (26,152,254)us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember		 (39,246,154)us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember
Distressed and Re-performing Loans [Member] | ARM [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value 149,642,416us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember		 148,092,775us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember
Unpaid Principal Balance 162,858,201us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember		 170,178,466us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember
Difference (13,215,785)us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember		 (22,085,691)us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember
Distressed and Re-performing Loans [Member] | Performing Loans [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value 388,796,859us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_PerformingFinancingReceivableMember		 321,548,115us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_PerformingFinancingReceivableMember
Unpaid Principal Balance 428,164,898us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_PerformingFinancingReceivableMember		 382,879,960us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_PerformingFinancingReceivableMember
Difference (39,368,039)us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_PerformingFinancingReceivableMember		 (61,331,845)us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_PerformingFinancingReceivableMember
Distressed and Re-performing Loans [Member] | Nonperforming Loans [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value 26,376,303us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember		 [1] 10,237,427us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember		 [2]
Unpaid Principal Balance 35,945,165us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember		 [1] 15,948,537us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember		 [1]
Difference $ (9,568,862)us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember		 $ (5,711,110)us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember
[1] The Company has elected the fair value option pursuant to ASC 825 for its mortgage loans held for investment. The Company recorded a gain of $7.1 million for the year ended December 31, 2013, as change in unrealized gain or loss on mortgage loans in the consolidated statements of operations.
[2] Loans that are delinquent for 60 days or more are considered non-performing.