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LOANS AND ALLOWANCE FOR LOAN LOSSES- Purchased Credit-Impaired Loans (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Jul. 04, 2014
Apr. 01, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Fair value of PCI loans at acquisition $ 228,956us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet $ 203,179us-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
 
East Carolina Bancorp, Inc        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Contractually required payments       61,801us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_BusinessAcquisitionAxis
= crfn_EastCarolinaBancorpMember
Nonaccretable difference       (11,433)us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference
/ us-gaap_BusinessAcquisitionAxis
= crfn_EastCarolinaBancorpMember
Cash flows expected to be collected at acquisition       50,368us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= crfn_EastCarolinaBancorpMember
Accretable yield       (4,242)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= crfn_EastCarolinaBancorpMember
Fair value of PCI loans at acquisition       $ 46,126us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_BusinessAcquisitionAxis
= crfn_EastCarolinaBancorpMember