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LOAN SERVICING (SBA Servicing Asset) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Servicing Assets at Fair Value [Line Items]      
Government-guaranteed lending $ 2,873,000crfn_GovernmentGuaranteedLendingNonInterestIncome $ 2,341,000crfn_GovernmentGuaranteedLendingNonInterestIncome  
Mortgage Loan Servicing      
Servicing Assets at Fair Value [Line Items]      
Unpaid principal balance 473,575,000crfn_ServicingAssetsUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= crfn_MortgageLoanServicingMember
  455,033,000crfn_ServicingAssetsUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= crfn_MortgageLoanServicingMember
Mortgage servicing fees 293,000us-gaap_FeesAndCommissionsMortgageBankingAndServicing
/ us-gaap_FinancialInstrumentAxis
= crfn_MortgageLoanServicingMember
   
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance 4,284,000us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FinancialInstrumentAxis
= crfn_MortgageLoanServicingMember
   
Additions 395,000us-gaap_ServicingAssetAtFairValueAdditions
/ us-gaap_FinancialInstrumentAxis
= crfn_MortgageLoanServicingMember
   
Repayments (129,000)crfn_ServicingAssetatFairValueRepayments
/ us-gaap_FinancialInstrumentAxis
= crfn_MortgageLoanServicingMember
   
Amortization (182,000)us-gaap_ServicingAssetAtFairValueOtherChangesThatAffectBalance
/ us-gaap_FinancialInstrumentAxis
= crfn_MortgageLoanServicingMember
   
Ending balance 4,368,000us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FinancialInstrumentAxis
= crfn_MortgageLoanServicingMember
   
Valuation allowance at end of period (255,000)us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance
/ us-gaap_FinancialInstrumentAxis
= crfn_MortgageLoanServicingMember
   
Balance at end of period after valuation allowance 4,113,000crfn_ServicingAssetsNetofValuationAllowance
/ us-gaap_FinancialInstrumentAxis
= crfn_MortgageLoanServicingMember
   
SBA Loans      
Servicing Assets at Fair Value [Line Items]      
Unpaid principal balance 156,277,000crfn_ServicingAssetsUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= crfn_SBALoansMember
  136,093,000crfn_ServicingAssetsUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= crfn_SBALoansMember
Government-guaranteed lending 371,000crfn_GovernmentGuaranteedLendingNonInterestIncome
/ us-gaap_FinancialInstrumentAxis
= crfn_SBALoansMember
192,000crfn_GovernmentGuaranteedLendingNonInterestIncome
/ us-gaap_FinancialInstrumentAxis
= crfn_SBALoansMember
 
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance 3,081,000us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FinancialInstrumentAxis
= crfn_SBALoansMember
1,759,000us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FinancialInstrumentAxis
= crfn_SBALoansMember
 
Additions 535,000us-gaap_ServicingAssetAtFairValueAdditions
/ us-gaap_FinancialInstrumentAxis
= crfn_SBALoansMember
419,000us-gaap_ServicingAssetAtFairValueAdditions
/ us-gaap_FinancialInstrumentAxis
= crfn_SBALoansMember
 
Amortization (96,000)us-gaap_ServicingAssetAtFairValueOtherChangesThatAffectBalance
/ us-gaap_FinancialInstrumentAxis
= crfn_SBALoansMember
(51,000)us-gaap_ServicingAssetAtFairValueOtherChangesThatAffectBalance
/ us-gaap_FinancialInstrumentAxis
= crfn_SBALoansMember
 
Ending balance 3,520,000us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FinancialInstrumentAxis
= crfn_SBALoansMember
2,127,000us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FinancialInstrumentAxis
= crfn_SBALoansMember
 
Valuation allowance at end of period $ 0us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance
/ us-gaap_FinancialInstrumentAxis
= crfn_SBALoansMember
  $ 0us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance
/ us-gaap_FinancialInstrumentAxis
= crfn_SBALoansMember