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LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 7) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average Balance $ 13,096us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment $ 8,611us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Interest Income 39us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod 6us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average Balance 8,072us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialRealEstateMember
4,341us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialRealEstateMember
Interest Income 16us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialRealEstateMember
6us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialRealEstateMember
Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average Balance 2,613us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= crfn_CommercialAndIndustrialLoansMember
352us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= crfn_CommercialAndIndustrialLoansMember
Interest Income 1us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= crfn_CommercialAndIndustrialLoansMember
0us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= crfn_CommercialAndIndustrialLoansMember
Construction and development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average Balance 889us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= crfn_ConstructionAndDevelopmentMember
2,445us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= crfn_ConstructionAndDevelopmentMember
Interest Income 0us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= crfn_ConstructionAndDevelopmentMember
0us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= crfn_ConstructionAndDevelopmentMember
Residential real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average Balance 1,132us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialRealEstateMember
923us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialRealEstateMember
Interest Income 22us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialRealEstateMember
0us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialRealEstateMember
Construction and development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average Balance 0us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= crfn_ConsumerConstructionAndDevelopmentMember
121us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= crfn_ConsumerConstructionAndDevelopmentMember
Interest Income 0us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= crfn_ConsumerConstructionAndDevelopmentMember
0us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= crfn_ConsumerConstructionAndDevelopmentMember
Home equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average Balance 390us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_HomeEquityMember
422us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_HomeEquityMember
Interest Income 0us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_HomeEquityMember
0us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_HomeEquityMember
Other consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average Balance 0us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ConsumerLoanMember
7us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ConsumerLoanMember
Interest Income $ 0us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ConsumerLoanMember
$ 0us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ConsumerLoanMember