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Fair Value (Schedule of Quantitative Summary Pertaining to MSRs) (Details) (Residential Mortgage [Member], USD $)
 12 Months Ended
Dec. 31, 2014
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]  
Discount rate - Effect on fair value of adverse change of: 5% (percentage) 5.00%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInDiscountRatePercent
Discount rate - Effect on fair value of adverse change of: 5% $ (683,406)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInDiscountRate
Discount rate - Effect on fair value of adverse change of: 10% (1,366,812)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate
Discount rate - Effect on fair value of adverse change of: 20% (2,655,493)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate
Prepayment Speed - Effect on fair value of adverse change of: 5% (percentage) 5.00%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInPrepaymentSpeedPercent
Prepayment Speed - Effect on fair value of adverse change of: 5% (639,594)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInPrepaymentSpeed
Prepayment Speed - Effect on fair value of adverse change of: 10% (1,279,187)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
Prepayment Speed - Effect on fair value of adverse change of: 20% (2,468,154)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed
Per-loan annual cost of servicing - Effect on fair value of adverse change of: 5% (percentage) 5.00%us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInOtherAssumptionPercent
Per-loan annual cost of servicing - Effect on fair value of adverse change of: 5% 389,384us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInOtherAssumption
Per-loan annual cost of servicing - Effect on fair value of adverse change of: 10% (778,768)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInOtherAssumption
Per-loan annual cost of servicing - Effect on fair value of adverse change of: 20% (1,557,561)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInOtherAssumption
Minimum [Member]
  
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]  
Discount rate 9.00%us-gaap_AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Prepayment speed 7.60%us-gaap_AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 [1]
Per-loan annual cost of servicing 76zfc_FairValueInputsCostOfServicing
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Maximum [Member]
  
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]  
Discount rate 10.00%us-gaap_AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Prepayment speed 58.20%us-gaap_AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 [1]
Per-loan annual cost of servicing 533zfc_FairValueInputsCostOfServicing
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Weighted Average [Member]
  
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]  
Discount rate 9.40%us-gaap_AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesDiscountRate
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Prepayment speed 10.60%us-gaap_AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 [1]
Per-loan annual cost of servicing $ 91zfc_FairValueInputsCostOfServicing
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
[1] Prepayment speed is measured using CPR.