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LOAN SERVICING (The characteristics and sensitivity of the fair value of MSRs to changes in key assumptions) (Details) (Mortgage Loan Servicing, USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Servicing Liabilities at Fair Value [Line Items]    
Composition of mortgage loans serviced for others: (as a percent) 100.00%crfn_ServicingAssetsandServicingLiabilitiesPercentageofTotal 100.00%crfn_ServicingAssetsandServicingLiabilitiesPercentageofTotal
Weighted average life (years) 5 years 6 months 15 days 5 years 9 months 7 days
Prepayment speed (as a percent) 13.37%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed 12.62%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed
Discount rate (as a percent) 9.50%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate 9.60%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate
0.25% $ 633crfn_SensitivityAnalysisofFairValueTransferorsInterestsinTransferredFinancialAssetsImpactof0.25PercentPositiveChangeinDiscountRate $ 566crfn_SensitivityAnalysisofFairValueTransferorsInterestsinTransferredFinancialAssetsImpactof0.25PercentPositiveChangeinDiscountRate
0.50% 944crfn_SensitivityAnalysisofFairValueTransferorsInterestsinTransferredFinancialAssetsImpactof0.50PercentPositiveChangeinDiscountRate 801crfn_SensitivityAnalysisofFairValueTransferorsInterestsinTransferredFinancialAssetsImpactof0.50PercentPositiveChangeinDiscountRate
- 0.25% (651)crfn_SensitivityAnalysisofFairValueTransferorsInterestsinTransferredFinancialAssetsImpactof0.25PercentAdverseChangeinDiscountRate (668)crfn_SensitivityAnalysisofFairValueTransferorsInterestsinTransferredFinancialAssetsImpactof0.25PercentAdverseChangeinDiscountRate
- 0.50% $ (822)crfn_SensitivityAnalysisofFairValueTransferorsInterestsinTransferredFinancialAssetsImpactof0.50PercentAdverseChangeinDiscountRate $ (844)crfn_SensitivityAnalysisofFairValueTransferorsInterestsinTransferredFinancialAssetsImpactof0.50PercentAdverseChangeinDiscountRate
Fixed Rate Residential Mortgage
   
Servicing Liabilities at Fair Value [Line Items]    
Composition of mortgage loans serviced for others: (as a percent) 99.88%crfn_ServicingAssetsandServicingLiabilitiesPercentageofTotal
/ us-gaap_FinancialInstrumentAxis
= crfn_MortgageLoanServicingMember
/ us-gaap_ParticipatingMortgageLoansAxis
= us-gaap_FixedRateResidentialMortgageMember
99.86%crfn_ServicingAssetsandServicingLiabilitiesPercentageofTotal
/ us-gaap_FinancialInstrumentAxis
= crfn_MortgageLoanServicingMember
/ us-gaap_ParticipatingMortgageLoansAxis
= us-gaap_FixedRateResidentialMortgageMember
Adjustable Rate Loans
   
Servicing Liabilities at Fair Value [Line Items]    
Composition of mortgage loans serviced for others: (as a percent) 0.12%crfn_ServicingAssetsandServicingLiabilitiesPercentageofTotal
/ us-gaap_FinancialInstrumentAxis
= crfn_MortgageLoanServicingMember
/ us-gaap_ParticipatingMortgageLoansAxis
= us-gaap_AdjustableRateLoansMember
0.14%crfn_ServicingAssetsandServicingLiabilitiesPercentageofTotal
/ us-gaap_FinancialInstrumentAxis
= crfn_MortgageLoanServicingMember
/ us-gaap_ParticipatingMortgageLoansAxis
= us-gaap_AdjustableRateLoansMember