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Loan Repurchase Facilities (Narrative) (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
Dec. 31, 2013
Line of Credit Facility [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    
Amount outstanding             300,092,293us-gaap_LineOfCredit 236,058,976us-gaap_LineOfCredit
Loan Repurchase Facility [Member] | Citi [Member]                
Line of Credit Facility [Line Items]                
Term of facility             364 days  
Increase in borrowing capacity             75,000,000zfc_LineOfCreditFacilityIncreaseToMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LineOfCreditFacilityAxis
= zfc_CitibankNaMember
 
Maximum amount of facility       250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LineOfCreditFacilityAxis
= zfc_CitibankNaMember
    325,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LineOfCreditFacilityAxis
= zfc_CitibankNaMember
 
Amount outstanding             299,402,024us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LineOfCreditFacilityAxis
= zfc_CitibankNaMember
236,058,976us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LineOfCreditFacilityAxis
= zfc_CitibankNaMember
Loan Repurchase Facility [Member] | Credit Suisse [Member]                
Line of Credit Facility [Line Items]                
Term of facility             364 days  
Maximum amount of facility             100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LineOfCreditFacilityAxis
= zfc_CreditSuisseFirstBostonMortgageCapitalLlcMember
 
Amount outstanding             $ 690,269us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LineOfCreditFacilityAxis
= zfc_CreditSuisseFirstBostonMortgageCapitalLlcMember