XML 20 R70.htm IDEA: XBRL DOCUMENT v2.4.1.9
Mortgage Loans Held for Investment, at Fair Value (Schedule of Fair Value, Principal Balance and Weighted Average Coupon and Yield) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Distressed and Re-performing Loans [Member]    
Mortgage Loans on Real Estate [Line Items]    
Unpaid Principal Balance $ 464,110,063us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember		 $ 398,828,497us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
Premium (Discount) (78,883,211)zfc_ServicingAssetUnamortizedPremiumDiscount
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember		 (74,179,437)zfc_ServicingAssetUnamortizedPremiumDiscount
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
Amortized Cost 385,226,852us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember		 324,649,060us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
Gross Unrealized    
Gains 37,140,755zfc_ServicingAssetGrossUnrealizedGains
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember		 [1] 13,386,924zfc_ServicingAssetGrossUnrealizedGains
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember		 [2]
Losses (7,194,445)zfc_ServicingAssetGrossUnrealizedLosses
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember		 [1] (6,250,442)zfc_ServicingAssetGrossUnrealizedLosses
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember		 [2]
Fair Value 415,173,162us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember		 331,785,542us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
Weighted Average Coupon 4.26%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember		 4.24%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
Weighted Average Yield 7.20%zfc_InvestmentOwnedWeightedAverageYield
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember		 [3] 6.91%zfc_InvestmentOwnedWeightedAverageYield
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember		 [3]
Distressed and Re-performing Loans [Member] | Fixed [Member]    
Mortgage Loans on Real Estate [Line Items]    
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
Premium (Discount) (51,501,092)zfc_ServicingAssetUnamortizedPremiumDiscount
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember		 (43,530,581)zfc_ServicingAssetUnamortizedPremiumDiscount
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember
Amortized Cost 213,805,605us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember		 169,170,913us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember
Gross Unrealized    
Gains 26,732,362zfc_ServicingAssetGrossUnrealizedGains
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember		 [1] 7,842,598zfc_ServicingAssetGrossUnrealizedGains
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember		 [2]
Losses (1,383,524)zfc_ServicingAssetGrossUnrealizedLosses
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember		 [1] (3,558,171)zfc_ServicingAssetGrossUnrealizedLosses
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember		 [2]
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
Weighted Average Coupon 4.50%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember		 4.56%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember
Weighted Average Yield 7.28%zfc_InvestmentOwnedWeightedAverageYield
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember		 [3] 7.05%zfc_InvestmentOwnedWeightedAverageYield
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember		 [3]
Distressed and Re-performing Loans [Member] | ARM [Member]    
Mortgage Loans on Real Estate [Line Items]    
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
Premium (Discount) (21,343,046)zfc_ServicingAssetUnamortizedPremiumDiscount
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember		 (25,617,563)zfc_ServicingAssetUnamortizedPremiumDiscount
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember
Amortized Cost 141,515,155us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember		 144,560,903us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember
Gross Unrealized    
Gains 9,568,296zfc_ServicingAssetGrossUnrealizedGains
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember		 [1] 5,088,302zfc_ServicingAssetGrossUnrealizedGains
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember		 [2]
Losses (1,441,035)zfc_ServicingAssetGrossUnrealizedLosses
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember		 [1] (1,556,430)zfc_ServicingAssetGrossUnrealizedLosses
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember		 [2]
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
Weighted Average Coupon 3.59%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember		 3.76%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember
Weighted Average Yield 7.10%zfc_InvestmentOwnedWeightedAverageYield
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember		 [3] 6.67%zfc_InvestmentOwnedWeightedAverageYield
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember		 [3]
Distressed and Re-performing Loans [Member] | Performing Loans [Member]    
Mortgage Loans on Real Estate [Line Items]    
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
Premium (Discount) (72,844,138)zfc_ServicingAssetUnamortizedPremiumDiscount
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_PerformingFinancingReceivableMember		 (69,148,144)zfc_ServicingAssetUnamortizedPremiumDiscount
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_PerformingFinancingReceivableMember
Amortized Cost 355,320,760us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_PerformingFinancingReceivableMember		 313,731,816us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_PerformingFinancingReceivableMember
Gross Unrealized    
Gains 36,300,658zfc_ServicingAssetGrossUnrealizedGains
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_PerformingFinancingReceivableMember		 [1] 12,930,900zfc_ServicingAssetGrossUnrealizedGains
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_PerformingFinancingReceivableMember		 [2]
Losses (2,824,559)zfc_ServicingAssetGrossUnrealizedLosses
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_PerformingFinancingReceivableMember		 [1] (5,114,601)zfc_ServicingAssetGrossUnrealizedLosses
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_PerformingFinancingReceivableMember		 [2]
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
Weighted Average Coupon 4.15%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_PerformingFinancingReceivableMember		 4.20%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_PerformingFinancingReceivableMember
Weighted Average Yield 7.21%zfc_InvestmentOwnedWeightedAverageYield
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_PerformingFinancingReceivableMember		 [3] 6.88%zfc_InvestmentOwnedWeightedAverageYield
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_PerformingFinancingReceivableMember		 [3]
Distressed and Re-performing Loans [Member] | Nonperforming Loans [Member]    
Mortgage Loans on Real Estate [Line Items]    
Unpaid Principal Balance 35,945,165us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember		 [2] 15,948,537us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember		 [2]
Premium (Discount) (6,039,073)zfc_ServicingAssetUnamortizedPremiumDiscount
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember		 [2] (5,031,293)zfc_ServicingAssetUnamortizedPremiumDiscount
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember		 [2]
Amortized Cost 29,906,092us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember		 [2] 10,917,244us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember		 [2]
Gross Unrealized    
Gains 840,097zfc_ServicingAssetGrossUnrealizedGains
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember		 [1],[2] 456,024zfc_ServicingAssetGrossUnrealizedGains
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember		 [2],[4]
Losses (4,369,886)zfc_ServicingAssetGrossUnrealizedLosses
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember		 [1],[2] (1,135,841)zfc_ServicingAssetGrossUnrealizedLosses
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember		 [2],[4]
Fair Value 26,376,303us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember		 [2] 10,237,427us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember		 [4]
Weighted Average Coupon 5.48%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember		 [2] 5.06%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember		 [4]
Weighted Average Yield 7.13%zfc_InvestmentOwnedWeightedAverageYield
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember		 [2],[3] 8.03%zfc_InvestmentOwnedWeightedAverageYield
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_DistressedAndReperformingLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_NonperformingFinancingReceivableMember		 [3],[4]
Mortgage Loans [Member]    
Mortgage Loans on Real Estate [Line Items]    
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
Gross Unrealized    
Fair Value 415,959,838us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_MortgageReceivablesMember		 331,785,542us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_MortgageReceivablesMember
Newly Originated Mortgage Loans [Member]    
Mortgage Loans on Real Estate [Line Items]    
Unpaid Principal Balance 766,965us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_NewlyOriginatedMortgageLoansMember		  
Premium (Discount) 16,173zfc_ServicingAssetUnamortizedPremiumDiscount
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_NewlyOriginatedMortgageLoansMember		  
Amortized Cost 783,138us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_NewlyOriginatedMortgageLoansMember		  
Gross Unrealized    
Gains 3,538zfc_ServicingAssetGrossUnrealizedGains
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_NewlyOriginatedMortgageLoansMember		 [5]  
Losses    [5]  
Fair Value 786,676us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_NewlyOriginatedMortgageLoansMember		  
Weighted Average Coupon 4.38%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_NewlyOriginatedMortgageLoansMember		  
Weighted Average Yield 4.20%zfc_InvestmentOwnedWeightedAverageYield
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_NewlyOriginatedMortgageLoansMember		 [3]  
Newly Originated Mortgage Loans [Member] | Fixed [Member]    
Mortgage Loans on Real Estate [Line Items]    
Unpaid Principal Balance 766,965us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_NewlyOriginatedMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember		  
Premium (Discount) 16,173zfc_ServicingAssetUnamortizedPremiumDiscount
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_NewlyOriginatedMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember		  
Amortized Cost 783,138us-gaap_ServicingAssetAtAmortizedValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_NewlyOriginatedMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember		  
Gross Unrealized    
Gains 3,538zfc_ServicingAssetGrossUnrealizedGains
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_NewlyOriginatedMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember		 [5]  
Losses    [5]  
Fair Value $ 786,676us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_NewlyOriginatedMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember		  
Weighted Average Coupon 4.38%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_NewlyOriginatedMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember		  
Weighted Average Yield 4.20%zfc_InvestmentOwnedWeightedAverageYield
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= zfc_NewlyOriginatedMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember		 [3]  
[1] The Company has elected the fair value option pursuant to ASC 825 for these mortgage loans held for investment. The Company recorded a gain of $22.8 million for the year ended December 31, 2014 as change in unrealized gain or loss on mortgage loans held for investment in the consolidated statements of operations.
[2] 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.
[3] Unleveraged yield.
[4] Loans that are delinquent for 60 days or more are considered non-performing.
[5] The Company has elected the fair value option pursuant to ASC 825 for these mortgage loans held for investment. The Company recorded a gain of $3,538 as change in unrealized gain or loss on mortgage loans held for investment in the consolidated statements of operations.