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Warehouse Lines of Credit (Schedule of Lines of Credit) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Short-term Debt [Line Items]    
Balance $ 300,092,293us-gaap_LineOfCredit $ 236,058,976us-gaap_LineOfCredit
Warehouse Agreement Borrowings [Member]    
Short-term Debt [Line Items]    
Balance 89,417,564us-gaap_LineOfCredit
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_WarehouseAgreementBorrowingsMember
 
Weighted Average Rate 2.52%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_WarehouseAgreementBorrowingsMember
 
Warehouse Agreement Borrowings [Member] | 30 Days or Less [Member]    
Short-term Debt [Line Items]    
Balance 21,210,431us-gaap_LineOfCredit
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityUpTo30DaysMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_WarehouseAgreementBorrowingsMember
 
Weighted Average Rate 2.47%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityUpTo30DaysMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_WarehouseAgreementBorrowingsMember
 
Warehouse Agreement Borrowings [Member] | Greater than 180 Days to 1 Year [Member]    
Short-term Debt [Line Items]    
Balance 57,118,533us-gaap_LineOfCredit
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= zfc_MaturityGreaterThanOneHundredEightyDaysToOneYearMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_WarehouseAgreementBorrowingsMember
 
Weighted Average Rate 2.46%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= zfc_MaturityGreaterThanOneHundredEightyDaysToOneYearMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_WarehouseAgreementBorrowingsMember
 
Warehouse Agreement Borrowings [Member] | Maturity Greater than 1 Year [Member]    
Short-term Debt [Line Items]    
Balance $ 11,088,600us-gaap_LineOfCredit
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= zfc_MaturityGreaterThan1YearMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_WarehouseAgreementBorrowingsMember
 
Weighted Average Rate 2.92%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= zfc_MaturityGreaterThan1YearMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_WarehouseAgreementBorrowingsMember