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LOANS AND ALLOWANCE FOR LOAN LOSSES (PCI Loans) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Jul. 04, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Fair value of PCI loans at acquisition $ 211,382us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet $ 228,956us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet  
Yadkin Financial Corporation      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Contractually required payments     110,365us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_BusinessAcquisitionAxis
= crfn_YadkinFinancialCorporationMember
Nonaccretable difference     (21,102)us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference
/ us-gaap_BusinessAcquisitionAxis
= crfn_YadkinFinancialCorporationMember
Cash flows expected to be collected at acquisition     89,263us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= crfn_YadkinFinancialCorporationMember
Accretable yield     (8,604)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= crfn_YadkinFinancialCorporationMember
Fair value of PCI loans at acquisition     $ 80,659us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_BusinessAcquisitionAxis
= crfn_YadkinFinancialCorporationMember