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BORROWINGS Short-Term and Long-Term Borrowings (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Aug. 31, 2013
Jul. 02, 2014
Short-term borrowings:        
FHLB advances maturing within one year 250,500,000us-gaap_FederalHomeLoanBankAdvancesCurrent $ 126,500,000us-gaap_FederalHomeLoanBankAdvancesCurrent    
Long-term debt:        
FHLB advances maturing beyond one year 104,651,000us-gaap_LongtermFederalHomeLoanBankAdvancesNoncurrent 19,299,000us-gaap_LongtermFederalHomeLoanBankAdvancesNoncurrent    
Subordinated term loan due 2018 7,060,000us-gaap_JuniorSubordinatedNotes 6,961,000us-gaap_JuniorSubordinatedNotes    
Subordinated notes due 2023 38,050,000us-gaap_SubordinatedDebt 38,050,000us-gaap_SubordinatedDebt 38,050,000us-gaap_SubordinatedDebt  
Capital lease obligations and other debt 5,972,000us-gaap_CapitalLeaseObligationsNoncurrent 3,051,000us-gaap_CapitalLeaseObligationsNoncurrent    
Long-term debt 180,164,000us-gaap_LongTermDebt 72,921,000us-gaap_LongTermDebt    
Short-term borrowings 250,500,000us-gaap_ShortTermBorrowings 126,500,000us-gaap_ShortTermBorrowings    
Line of credit facility, fair value of amount outstanding 0us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding 0us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding    
Revolving Credit Facility        
Long-term debt:        
Line of credit facility, fair value of amount outstanding 0us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
     
Line of Credit Facility, Current Borrowing Capacity       10,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Revolving Credit Facility | London Interbank Offered Rate (LIBOR)        
Long-term debt:        
Debt instrument, basis spread on variable rate 4.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
     
Minimum        
Long-term debt:        
Percentage of collateral that may be borrowed (as a percent) 60.00%crfn_PercentageOfCollateralThatMayBeBorrowed
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Maximum        
Long-term debt:        
Percentage of collateral that may be borrowed (as a percent) 65.00%crfn_PercentageOfCollateralThatMayBeBorrowed
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Line of Credit        
Long-term debt:        
Loans pledged as collateral 364,874,000us-gaap_LoansPledgedAsCollateral
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Federal Reserve Bank Advances        
Long-term debt:        
Long-term debt 0us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalReserveBankAdvancesMember
0us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalReserveBankAdvancesMember
   
Federal Funds Purchased | Line of Credit        
Long-term debt:        
Short-term borrowings 172,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_FederalFundsPurchasedMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Maturing October 7, 2033        
Long-term debt:        
Subordinated term loan 5,629,000us-gaap_SubordinatedLongTermDebt
/ us-gaap_DebtInstrumentAxis
= crfn_MaturingOctober72033Member
5,560,000us-gaap_SubordinatedLongTermDebt
/ us-gaap_DebtInstrumentAxis
= crfn_MaturingOctober72033Member
   
Maturing December 15, 2033        
Long-term debt:        
Subordinated term loan 6,687,000us-gaap_SubordinatedLongTermDebt
/ us-gaap_DebtInstrumentAxis
= crfn_MaturityDecember152033Member
0us-gaap_SubordinatedLongTermDebt
/ us-gaap_DebtInstrumentAxis
= crfn_MaturityDecember152033Member
   
Maturing December 15, 2037        
Long-term debt:        
Subordinated term loan 12,115,000us-gaap_SubordinatedLongTermDebt
/ us-gaap_DebtInstrumentAxis
= crfn_MaturityDecember152037Member
0us-gaap_SubordinatedLongTermDebt
/ us-gaap_DebtInstrumentAxis
= crfn_MaturityDecember152037Member
   
Federal Reserve Bank Advances | Line of Credit        
Long-term debt:        
Loans pledged as collateral 4,877,000us-gaap_LoansPledgedAsCollateral
/ us-gaap_DebtInstrumentAxis
= us-gaap_FederalReserveBankAdvancesMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LineOfCreditMember