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Subsequent Events (Details) (Warehouse Agreement Borrowings [Member], Warehouse Line of Credit Two [Member], USD $)
Dec. 31, 2014
Feb. 28, 2015
Subsequent Event [Line Items]    
Maximum amount of facility $ 35,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity  
Subsequent Event [Member]    
Subsequent Event [Line Items]    
Maximum amount of facility   $ 50,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= zfc_WarehouseLineOfCreditTwoMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_WarehouseAgreementBorrowingsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember