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BUSINESS COMBINATIONS - Summary of Acquired Assets and Assumed Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
0 Months Ended
Nov. 08, 2014
Jan. 31, 2014
Mar. 31, 2015
Dec. 31, 2014
Assets acquired:        
Goodwill     $ 31,591us-gaap_Goodwill $ 31,591us-gaap_Goodwill
Banco Popular Branches        
Assets acquired:        
Cash and due from banks 5,532us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Loans and leases receivable 1,072,449banc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedLoansandLeasesReceivable
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Premises, equipment, and capital leases 9,002us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Goodwill 0us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Other intangible assets 15,777us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Other assets 2,301banc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Total assets acquired 1,105,061banc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Liabilities assumed:        
Deposits 1,076,614banc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDepositLiabilities
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Other liabilities 506banc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherLiabilities
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Total liabilities assumed 1,077,120us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Total consideration paid 27,941us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Summary of consideration        
Cash paid 27,941us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Common stock issued 0us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Earn-out liabilities 0us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
     
Renovation Ready        
Assets acquired:        
Cash and due from banks   0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= banc_RenovationReadyMember
   
Loans and leases receivable   0banc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedLoansandLeasesReceivable
/ us-gaap_BusinessAcquisitionAxis
= banc_RenovationReadyMember
   
Premises, equipment, and capital leases   0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= banc_RenovationReadyMember
   
Goodwill   2,239us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= banc_RenovationReadyMember
   
Other intangible assets   761us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= banc_RenovationReadyMember
   
Other assets   0banc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= banc_RenovationReadyMember
   
Total assets acquired   3,000banc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= banc_RenovationReadyMember
   
Liabilities assumed:        
Deposits   0banc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDepositLiabilities
/ us-gaap_BusinessAcquisitionAxis
= banc_RenovationReadyMember
   
Other liabilities   1,000banc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherLiabilities
/ us-gaap_BusinessAcquisitionAxis
= banc_RenovationReadyMember
   
Total liabilities assumed   1,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= banc_RenovationReadyMember
   
Total consideration paid   2,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= banc_RenovationReadyMember
   
Summary of consideration        
Cash paid   1,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= banc_RenovationReadyMember
   
Common stock issued   1,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= banc_RenovationReadyMember
   
Earn-out liabilities   $ 1,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= banc_RenovationReadyMember