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FAIR VALUE MEASUREMENTS (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Investment securities available for sale $ 658,323us-gaap_AvailableForSaleSecurities $ 672,421us-gaap_AvailableForSaleSecurities [1]
Foreclosed assets 12,427us-gaap_ForeclosedAssets 12,891us-gaap_ForeclosedAssets [1]
Level 1    
Investment securities available for sale 63,967us-gaap_AvailableForSaleSecurities
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SBA loans held for investment 0us-gaap_HeldToMaturitySecuritiesFairValue
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Level 2    
Investment securities available for sale 582,976us-gaap_AvailableForSaleSecurities
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SBA loans held for investment 40,607us-gaap_HeldToMaturitySecuritiesFairValue
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Level 3    
Investment securities available for sale 11,380us-gaap_AvailableForSaleSecurities
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SBA loans held for investment 0us-gaap_HeldToMaturitySecuritiesFairValue
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Estimate of Fair Value Measurement    
Investment securities available for sale 658,323us-gaap_AvailableForSaleSecurities
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SBA loans held for investment 40,607us-gaap_HeldToMaturitySecuritiesFairValue
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Recurring | Level 1    
Derivative assets 0us-gaap_InterestRateDerivativeAssetsAtFairValue
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Derivative liabilities 0us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
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Recurring | Level 1 | GSE obligations    
Investment securities available for sale 0us-gaap_AvailableForSaleSecurities
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Recurring | Level 1 | SBA-guaranteed securities    
Investment securities available for sale 58,345us-gaap_AvailableForSaleSecurities
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Recurring | Level 1 | Mortgage-backed securities issued by GSE    
Investment securities available for sale 0us-gaap_AvailableForSaleSecurities
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Recurring | Level 1 | Corporate bonds    
Investment securities available for sale 2,524us-gaap_AvailableForSaleSecurities
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Recurring | Level 1 | Non-agency RMBS    
Investment securities available for sale 0us-gaap_AvailableForSaleSecurities
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Recurring | Level 1 | Non-agency CMBS    
Investment securities available for sale 0us-gaap_AvailableForSaleSecurities
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Recurring | Level 1 | Municipal bonds    
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Recurring | Level 1 | Other debt securities    
Investment securities available for sale 245us-gaap_AvailableForSaleSecurities
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Recurring | Level 1 | Equity securities    
Investment securities available for sale 2,811us-gaap_AvailableForSaleSecurities
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Recurring | Level 2    
Derivative assets 834us-gaap_InterestRateDerivativeAssetsAtFairValue
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Derivative liabilities 4,251us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
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Recurring | Level 2 | GSE obligations    
Investment securities available for sale 15,035us-gaap_AvailableForSaleSecurities
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Recurring | Level 2 | SBA-guaranteed securities    
Investment securities available for sale 0us-gaap_AvailableForSaleSecurities
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SBA-guaranteed loans held for sale 7,735us-gaap_LoansHeldForSaleFairValueDisclosure
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Recurring | Level 2 | Mortgage-backed securities issued by GSE    
Investment securities available for sale 414,436us-gaap_AvailableForSaleSecurities
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Recurring | Level 2 | Corporate bonds    
Investment securities available for sale 106,351us-gaap_AvailableForSaleSecurities
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Recurring | Level 2 | Non-agency RMBS    
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Recurring | Level 3    
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Recurring | Level 3 | Corporate bonds    
Investment securities available for sale 11,380us-gaap_AvailableForSaleSecurities
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Recurring | Level 3 | Non-agency RMBS    
Investment securities available for sale 0us-gaap_AvailableForSaleSecurities
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Recurring | Level 3 | Non-agency CMBS    
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Recurring | Level 3 | Municipal bonds    
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Investment securities available for sale 0us-gaap_AvailableForSaleSecurities
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Recurring | Estimate of Fair Value Measurement    
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Recurring | Estimate of Fair Value Measurement | GSE obligations    
Investment securities available for sale 15,035us-gaap_AvailableForSaleSecurities
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Recurring | Estimate of Fair Value Measurement | SBA-guaranteed securities    
Investment securities available for sale 58,345us-gaap_AvailableForSaleSecurities
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Recurring | Estimate of Fair Value Measurement | Mortgage-backed securities issued by GSE    
Investment securities available for sale 414,436us-gaap_AvailableForSaleSecurities
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Recurring | Estimate of Fair Value Measurement | Corporate bonds    
Investment securities available for sale 120,255us-gaap_AvailableForSaleSecurities
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Recurring | Estimate of Fair Value Measurement | Non-agency RMBS    
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Recurring | Estimate of Fair Value Measurement | Non-agency CMBS    
Investment securities available for sale 3,548us-gaap_AvailableForSaleSecurities
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Recurring | Estimate of Fair Value Measurement | Municipal bonds    
Investment securities available for sale 39,131us-gaap_AvailableForSaleSecurities
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Recurring | Estimate of Fair Value Measurement | Other debt securities    
Investment securities available for sale 245us-gaap_AvailableForSaleSecurities
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Recurring | Estimate of Fair Value Measurement | Equity securities    
Investment securities available for sale 2,811us-gaap_AvailableForSaleSecurities
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Nonrecurring | Level 1 | Impaired loans    
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Nonrecurring | Level 1 | Foreclosed assets    
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Nonrecurring | Level 2 | Impaired loans    
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Nonrecurring | Level 2 | Foreclosed assets    
Foreclosed assets 0us-gaap_ForeclosedAssets
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Nonrecurring | Level 3 | Impaired loans    
Impaired loans 16,031crfn_ImpairedLoansAtFairValue
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Nonrecurring | Level 3 | Foreclosed assets    
Foreclosed assets 12,427us-gaap_ForeclosedAssets
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Nonrecurring | Estimate of Fair Value Measurement | Impaired loans    
Impaired loans 16,031crfn_ImpairedLoansAtFairValue
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Nonrecurring | Estimate of Fair Value Measurement | Foreclosed assets    
Foreclosed assets $ 12,427us-gaap_ForeclosedAssets
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[1] Derived from the audited consolidated financial statements included in the Company's 2014 Annual Report on Form 10-K.