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BUSINESS COMBINATIONS - Banco Popular's California Branch Network Acquisition (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended
Nov. 08, 2014
Mar. 31, 2015
Dec. 31, 2014
Nov. 07, 2014
Fair value adjustments        
Goodwill   $ 31,591us-gaap_Goodwill $ 31,591us-gaap_Goodwill  
Banco Popular Branches        
Business Acquisition [Line Items]        
Total Consideration 27,941us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Fair value adjustments        
Loans receivable (12,165)banc_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLoansReceivable
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Core deposit intangibles 15,777us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Certificates of deposit purchase premium (916)banc_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCertificateofDepositsPurchasePremium
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Premises and equipment 1,218us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Total fair value adjustments 3,914us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Fair value of net assets acquired 27,941us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Goodwill 0us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Banco Popular Branches        
Business Acquisition [Line Items]        
Net assets pre-acquisition       $ 24,027us-gaap_AssetsNet
/ dei_LegalEntityAxis
= banc_BancoPopularNorthAmericaMember