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Mortgage Loans Held for Sale (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items]    
Unpaid Principal Balance $ 92,917,659us-gaap_PrincipalAmountOutstandingOnLoansHeldForSaleOrSecuritization  
Fair Value 97,690,960us-gaap_MortgagesHeldForSaleFairValueDisclosure   
Conventional [Member]    
Mortgage Loans on Real Estate [Line Items]    
Unpaid Principal Balance 55,073,645us-gaap_PrincipalAmountOutstandingOnLoansHeldForSaleOrSecuritization
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember		  
Fair Value 57,058,195us-gaap_MortgagesHeldForSaleFairValueDisclosure
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember		  
Governmental [Member]    
Mortgage Loans on Real Estate [Line Items]    
Unpaid Principal Balance 13,407,781us-gaap_PrincipalAmountOutstandingOnLoansHeldForSaleOrSecuritization
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= zfc_GovernmentalMortgagesMember		  
Fair Value 14,601,797us-gaap_MortgagesHeldForSaleFairValueDisclosure
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= zfc_GovernmentalMortgagesMember		  
Reverse Mortgage [Member]    
Mortgage Loans on Real Estate [Line Items]    
Unpaid Principal Balance 1,600,449us-gaap_PrincipalAmountOutstandingOnLoansHeldForSaleOrSecuritization
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= zfc_ReverseMortgagesMember		  
Fair Value 1,765,552us-gaap_MortgagesHeldForSaleFairValueDisclosure
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= zfc_ReverseMortgagesMember		  
United States Department of Agriculture Loans [Member]    
Mortgage Loans on Real Estate [Line Items]    
Unpaid Principal Balance 16,105,088us-gaap_PrincipalAmountOutstandingOnLoansHeldForSaleOrSecuritization
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= zfc_UnitedStatesDepartmentOfAgricultureLoansMember		  
Fair Value 17,069,138us-gaap_MortgagesHeldForSaleFairValueDisclosure
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= zfc_UnitedStatesDepartmentOfAgricultureLoansMember		  
United States Department of Veteran Affairs Loan [Member]    
Mortgage Loans on Real Estate [Line Items]    
Unpaid Principal Balance 6,730,696us-gaap_PrincipalAmountOutstandingOnLoansHeldForSaleOrSecuritization
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_VeteransAdministrationLoanMember		  
Fair Value $ 7,196,278us-gaap_MortgagesHeldForSaleFairValueDisclosure
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_VeteransAdministrationLoanMember