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INCOME TAXES - Net Operating Losses (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards $ 102,866us-gaap_OperatingLossCarryforwards    
Operating loss carryforward, recognized built-in losses in excess of annual tax limitations 21,658crfn_OperatingLossCarryforwardRecognizedBuiltInLossesInExcessOfAnnualTaxLimitations    
Net operating loss carryforwards, subject to expiration 1,917crfn_OperatingLossCarryforwardsExpectedtoExpire    
Period of cumulative pre-tax income position 3 years    
Classified asset ratio to tier one capital plus allowance for loan losses (in percent) 22.00%crfn_ClassifiedAssetRatioToTierOneCapitalPlusAllowanceForLoanLosses 30.00%crfn_ClassifiedAssetRatioToTierOneCapitalPlusAllowanceForLoanLosses  
Change in deferred tax asset valuation allowance 4,797us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 460us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 1,869us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Valuation allowance (1,185)us-gaap_DeferredTaxAssetsValuationAllowance (5,130)us-gaap_DeferredTaxAssetsValuationAllowance  
Piedmont Community Bank Holdings Inc      
Operating Loss Carryforwards [Line Items]      
Change in deferred tax asset valuation allowance $ 4,706us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_BusinessAcquisitionAxis
= crfn_PiedmontCommunityBankHoldingsIncMember