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LOANS AND ALLOWANCE FOR LOAN LOSSES- Troubled Debt Restructuring (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
loan
Dec. 31, 2013
loan
TDR's Outstanding [Abstract]    
Recorded Investment $ 6,371us-gaap_FinancingReceivableModificationsRecordedInvestment $ 1,232us-gaap_FinancingReceivableModificationsRecordedInvestment
Number (in loans) 21us-gaap_FinancingReceivableModificationsNumberOfContracts2 9us-gaap_FinancingReceivableModificationsNumberOfContracts2
TDR's Modified [Abstract]    
TDRs Modified, Recorded Investment 5,223us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 845us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
TDRs modified (in loans) 10crfn_FinancingReceivableModificationsPostModificationRecordedInvestmentNumber 6crfn_FinancingReceivableModificationsPostModificationRecordedInvestmentNumber
TDR's Defaulted [Abstract]    
TDRs Defaulted, Recorded Investment 1,102us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 60us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
TDRs Defaulted (in loans) 5us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 2us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Commercial real estate    
TDR's Outstanding [Abstract]    
Recorded Investment 4,215us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember
815us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember
Number (in loans) 7us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember
2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember
TDR's Modified [Abstract]    
TDRs Modified, Recorded Investment 3,460us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember
534us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember
TDRs modified (in loans) 4crfn_FinancingReceivableModificationsPostModificationRecordedInvestmentNumber
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember
1crfn_FinancingReceivableModificationsPostModificationRecordedInvestmentNumber
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember
TDR's Defaulted [Abstract]    
TDRs Defaulted, Recorded Investment 890us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember
0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember
TDRs Defaulted (in loans) 3us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember
0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember
Commercial and industrial    
TDR's Outstanding [Abstract]    
Recorded Investment 172us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_CommercialAndIndustrialLoansMember
20us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_CommercialAndIndustrialLoansMember
Number (in loans) 4us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_CommercialAndIndustrialLoansMember
1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_CommercialAndIndustrialLoansMember
TDR's Modified [Abstract]    
TDRs Modified, Recorded Investment 105us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_CommercialAndIndustrialLoansMember
0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_CommercialAndIndustrialLoansMember
TDRs modified (in loans) 2crfn_FinancingReceivableModificationsPostModificationRecordedInvestmentNumber
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_CommercialAndIndustrialLoansMember
0crfn_FinancingReceivableModificationsPostModificationRecordedInvestmentNumber
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_CommercialAndIndustrialLoansMember
TDR's Defaulted [Abstract]    
TDRs Defaulted, Recorded Investment 212us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_CommercialAndIndustrialLoansMember
 
TDRs Defaulted (in loans) 2us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_CommercialAndIndustrialLoansMember
 
Commercial construction    
TDR's Outstanding [Abstract]    
Recorded Investment 131us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_ConstructionAndDevelopmentMember
161us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_ConstructionAndDevelopmentMember
Number (in loans) 2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_ConstructionAndDevelopmentMember
1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_ConstructionAndDevelopmentMember
TDR's Modified [Abstract]    
TDRs Modified, Recorded Investment 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_ConstructionAndDevelopmentMember
161us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_ConstructionAndDevelopmentMember
TDRs modified (in loans) 0crfn_FinancingReceivableModificationsPostModificationRecordedInvestmentNumber
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_ConstructionAndDevelopmentMember
1crfn_FinancingReceivableModificationsPostModificationRecordedInvestmentNumber
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_ConstructionAndDevelopmentMember
TDR's Defaulted [Abstract]    
TDRs Defaulted, Recorded Investment 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_ConstructionAndDevelopmentMember
0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_ConstructionAndDevelopmentMember
TDRs Defaulted (in loans) 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_ConstructionAndDevelopmentMember
0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= crfn_ConstructionAndDevelopmentMember
Residential real estate    
TDR's Outstanding [Abstract]    
Recorded Investment 1,770us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialRealEstateMember
133us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialRealEstateMember
Number (in loans) 6us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialRealEstateMember
2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialRealEstateMember
TDR's Modified [Abstract]    
TDRs Modified, Recorded Investment 1,658us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialRealEstateMember
47us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialRealEstateMember
TDRs modified (in loans) 4crfn_FinancingReceivableModificationsPostModificationRecordedInvestmentNumber
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialRealEstateMember
1crfn_FinancingReceivableModificationsPostModificationRecordedInvestmentNumber
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialRealEstateMember
TDR's Defaulted [Abstract]    
TDRs Defaulted, Recorded Investment 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialRealEstateMember
47us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialRealEstateMember
TDRs Defaulted (in loans) 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialRealEstateMember
1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialRealEstateMember
Home equity    
TDR's Outstanding [Abstract]    
Recorded Investment 83us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_HomeEquityMember
90us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_HomeEquityMember
Number (in loans) 2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_HomeEquityMember
2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_HomeEquityMember
TDR's Modified [Abstract]    
TDRs Modified, Recorded Investment 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_HomeEquityMember
90us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_HomeEquityMember
TDRs modified (in loans) 0crfn_FinancingReceivableModificationsPostModificationRecordedInvestmentNumber
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_HomeEquityMember
2crfn_FinancingReceivableModificationsPostModificationRecordedInvestmentNumber
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_HomeEquityMember
TDR's Defaulted [Abstract]    
TDRs Defaulted, Recorded Investment 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_HomeEquityMember
0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_HomeEquityMember
TDRs Defaulted (in loans) 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_HomeEquityMember
0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_HomeEquityMember
Consumer    
TDR's Outstanding [Abstract]    
Recorded Investment 0us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerLoanMember
13us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerLoanMember
Number (in loans) 0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerLoanMember
1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerLoanMember
TDR's Modified [Abstract]    
TDRs Modified, Recorded Investment 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerLoanMember
13us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerLoanMember
TDRs modified (in loans) 0crfn_FinancingReceivableModificationsPostModificationRecordedInvestmentNumber
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerLoanMember
1crfn_FinancingReceivableModificationsPostModificationRecordedInvestmentNumber
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerLoanMember
TDR's Defaulted [Abstract]    
TDRs Defaulted, Recorded Investment $ 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerLoanMember
$ 13us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerLoanMember
TDRs Defaulted (in loans) 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerLoanMember
1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerLoanMember