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LOANS AND ALLOWANCE FOR LOAN LOSSES- Summary of Loans (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 2,899,037us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 1,393,321us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Less:    
Deferred loan fees (771)crfn_DeferredOriginationFee (488)crfn_DeferredOriginationFee
Allowance for loan losses (7,817)us-gaap_LoansAndLeasesReceivableAllowance (7,043)us-gaap_LoansAndLeasesReceivableAllowance
Net loans 2,890,449us-gaap_LoansAndLeasesReceivableNetReportedAmountCovered 1,385,790us-gaap_LoansAndLeasesReceivableNetReportedAmountCovered
Recorded investment of loans 828,365us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivablePledgedAsCollateral 424,414us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivablePledgedAsCollateral
Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 1,355,536us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CommercialRealEstateMember
670,293us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CommercialRealEstateMember
Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 468,848us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= crfn_CommercialAndIndustrialLoansMember
230,614us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= crfn_CommercialAndIndustrialLoansMember
Commercial Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 370,807us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConstructionLoansMember
175,794us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConstructionLoansMember
Residential real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 360,249us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ResidentialRealEstateMember
191,378us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ResidentialRealEstateMember
Construction and development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 30,061us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= crfn_ConsumerConstructionAndDevelopmentMember
22,520us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= crfn_ConsumerConstructionAndDevelopmentMember
Home equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 276,662us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_HomeEquityMember
94,390us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_HomeEquityMember
Other consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 36,874us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConsumerLoanMember
$ 8,332us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConsumerLoanMember