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FAIR VALUE MEASUREMENTS (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Recurring measurements:    
Investment securities available for sale $ 658,323us-gaap_AvailableForSaleSecurities $ 672,421us-gaap_AvailableForSaleSecurities [1]
Nonrecurring measurements:    
Foreclosed assets 12,427us-gaap_ForeclosedAssets 12,891us-gaap_ForeclosedAssets [1]
Level 3    
Recurring measurements:    
Investment securities available for sale 11,380us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 11,290us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Level 3 | Recurring    
Recurring measurements:    
Derivative assets 636us-gaap_InterestRateDerivativeAssetsAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		  
Level 3 | Recurring | Pricing model | Available-for-sale Securities    
Valuation Technique Pricing model  
Unobservable Input Illiquidity or credit factor in discount rates  
Recurring measurements:    
Investment securities available for sale 11,380us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ValuationTechniqueAxis
= crfn_PricingModelMember		 11,290us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ValuationTechniqueAxis
= crfn_PricingModelMember
Level 3 | Recurring | Pricing model | Available-for-sale Securities | Minimum    
Nonrecurring measurements:    
Illiquidity of credit (as a percentage) 1.00%crfn_FairValueInputsIlliquidityinDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= crfn_PricingModelMember		  
Level 3 | Recurring | Pricing model | Available-for-sale Securities | Maximum    
Nonrecurring measurements:    
Illiquidity of credit (as a percentage) 2.00%crfn_FairValueInputsIlliquidityinDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= crfn_PricingModelMember		  
Level 3 | Recurring | Pricing model | Interest rate lock commitments    
Valuation Technique Pricing model  
Unobservable Input Pull through rates  
Recurring measurements:    
Derivative assets 636us-gaap_InterestRateDerivativeAssetsAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_ValuationTechniqueAxis
= crfn_PricingModelMember		 342us-gaap_InterestRateDerivativeAssetsAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_ValuationTechniqueAxis
= crfn_PricingModelMember
Level 3 | Recurring | Pricing model | Interest rate lock commitments | Minimum    
Nonrecurring measurements:    
Pull through rates (as a percentage) 80.00%crfn_PullThroughRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= crfn_PricingModelMember		  
Level 3 | Recurring | Pricing model | Interest rate lock commitments | Maximum    
Nonrecurring measurements:    
Pull through rates (as a percentage) 95.00%crfn_PullThroughRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= crfn_PricingModelMember		  
Level 3 | Nonrecurring | Impaired loans    
Nonrecurring measurements:    
Impaired loans 16,031crfn_ImpairedLoansAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= crfn_ImpairedLoansMember		 9,595crfn_ImpairedLoansAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= crfn_ImpairedLoansMember
Level 3 | Nonrecurring | Foreclosed assets    
Nonrecurring measurements:    
Foreclosed assets 12,427us-gaap_ForeclosedAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= crfn_ForeclosedAssetsMember		  
Level 3 | Nonrecurring | Discounted appraisals | Impaired loans    
Valuation Technique Discounted appraisals  
Unobservable Input Collateral discounts  
Level 3 | Nonrecurring | Discounted appraisals | Impaired loans | Minimum    
Nonrecurring measurements:    
Collateral discounts (as a percentage) 15.00%crfn_CollateralDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= crfn_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= crfn_DiscountedAppraisalsMember		  
Level 3 | Nonrecurring | Discounted appraisals | Impaired loans | Maximum    
Nonrecurring measurements:    
Collateral discounts (as a percentage) 50.00%crfn_CollateralDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= crfn_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= crfn_DiscountedAppraisalsMember		  
Level 3 | Nonrecurring | Discounted appraisals | Foreclosed assets    
Valuation Technique Discounted appraisals  
Unobservable Input Collateral discounts  
Nonrecurring measurements:    
Foreclosed assets $ 12,427us-gaap_ForeclosedAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= crfn_ForeclosedAssetsMember
/ us-gaap_ValuationTechniqueAxis
= crfn_DiscountedAppraisalsMember		 $ 12,891us-gaap_ForeclosedAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= crfn_ForeclosedAssetsMember
/ us-gaap_ValuationTechniqueAxis
= crfn_DiscountedAppraisalsMember
Level 3 | Nonrecurring | Discounted appraisals | Foreclosed assets | Minimum    
Nonrecurring measurements:    
Collateral discounts (as a percentage) 15.00%crfn_CollateralDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= crfn_ForeclosedAssetsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= crfn_DiscountedAppraisalsMember		  
Level 3 | Nonrecurring | Discounted appraisals | Foreclosed assets | Maximum    
Nonrecurring measurements:    
Collateral discounts (as a percentage) 50.00%crfn_CollateralDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= crfn_ForeclosedAssetsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= crfn_DiscountedAppraisalsMember		  
Level 3 | Nonrecurring | Discounted expected cash flows | Impaired loans    
Valuation Technique Discounted expected cash flows  
Unobservable Input Expected loss rates  
Level 3 | Nonrecurring | Discounted expected cash flows | Impaired loans | Minimum    
Nonrecurring measurements:    
Expected loss rates (as a percentage) 0.00%crfn_FairValueExpectedLossRates
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= crfn_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= crfn_DiscountedExpectedCashFlowsMember		  
Discount rates (as a percent) 2.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= crfn_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= crfn_DiscountedExpectedCashFlowsMember		  
Level 3 | Nonrecurring | Discounted expected cash flows | Impaired loans | Maximum    
Nonrecurring measurements:    
Expected loss rates (as a percentage) 75.00%crfn_FairValueExpectedLossRates
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= crfn_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= crfn_DiscountedExpectedCashFlowsMember		  
Discount rates (as a percent) 8.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= crfn_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= crfn_DiscountedExpectedCashFlowsMember		  
Level 3 | Nonrecurring | Discount rates | Impaired loans    
Unobservable Input Discount rates  
[1] Derived from the audited consolidated financial statements included in the Company's 2014 Annual Report on Form 10-K.