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GOODWILL AND OTHER INTANGIBLE ASSETS - Carrying Amounts of Intangible Assets (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Goodwill [Line Items]        
Goodwill $ 151,083,000us-gaap_GoodwillGross $ 26,254,000us-gaap_GoodwillGross $ 26,254,000us-gaap_GoodwillGross $ 26,254,000us-gaap_GoodwillGross
Finite-lived Intangible Assets [Roll Forward]        
Core Deposit Intangible, Amortization expense (2,157,000)us-gaap_AmortizationOfIntangibleAssets (800,000)us-gaap_AmortizationOfIntangibleAssets (448,000)us-gaap_AmortizationOfIntangibleAssets  
Tax basis in goodwill from mergers and acquisitions 0crfn_TaxBasisinGoodwillfromMergersandAcquisitions      
Tax deductible goodwill from acquisitions 0us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount      
VantageSouth Bancshares, Inc. and Piedmont Community Bank Holdings, Inc.        
Goodwill [Line Items]        
Goodwill 124,829,000us-gaap_GoodwillGross
/ us-gaap_BusinessAcquisitionAxis
= crfn_VantageSouthBancsharesInc.andPiedmontCommunityBankHoldingsInc.Member
     
Core Deposits        
Finite-lived Intangible Assets [Roll Forward]        
Core Deposit Intangible, Gross 7,435,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
3,128,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
3,128,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
 
Core Deposit Intangible, Gross 20,386,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
7,435,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
3,128,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
 
Core Deposit Intangible, Accumulated Amortization (1,552,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
(752,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
(304,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
 
Core Deposit Intangible, Amortization expense (2,157,000)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
(800,000)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
(448,000)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
 
Core Deposit Intangible, Accumulated Amortization (3,709,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
(1,552,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
(752,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
 
Core Deposit Intangible, Net 16,677,000us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
5,883,000us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
2,376,000us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
2,824,000us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
Core Deposits | East Carolina Bancorp, Inc        
Finite-lived Intangible Assets [Roll Forward]        
Core Deposit Intangible Balance from Merger   4,307,000us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_BusinessAcquisitionAxis
= crfn_EastCarolinaBancorpMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
   
Core deposit intangible from the ECB merger, weighted average useful life (in years) 10 years      
Core Deposits | VantageSouth Bancshares, Inc. and Piedmont Community Bank Holdings, Inc.        
Finite-lived Intangible Assets [Roll Forward]        
Core Deposit Intangible Balance from Merger $ 12,951,000us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_BusinessAcquisitionAxis
= crfn_VantageSouthBancsharesInc.andPiedmontCommunityBankHoldingsInc.Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember