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RELATED-PARTY TRANSACTIONS - Transactions Involving Jeffrey T. Seabold (Details) (USD $)
0 Months Ended 12 Months Ended 0 Months Ended
May 13, 2013
Dec. 27, 2012
Dec. 31, 2013
Oct. 31, 2013
Managing Director and Chief Lending Officer | Management and Services Agreement        
Related Party Transaction [Line Items]        
Monthly compensation for services   $ 100,000banc_RelatedPartyTransactionProfessionalServicesMonthlyPayments
/ us-gaap_RelatedPartyTransactionAxis
= banc_ManagementAndServicesAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_ManagingDirectorandChiefLendingOfficerMember
   
Employment agreement, term 3 years      
Expenses from transactions with related parties     439,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= banc_ManagementAndServicesAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_ManagingDirectorandChiefLendingOfficerMember
 
Business acquisition, purchase price 10,000,000banc_RelatedPartyTransactionEmploymentAgreementPurchasePriceCallOption
/ us-gaap_RelatedPartyTransactionAxis
= banc_ManagementAndServicesAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_ManagingDirectorandChiefLendingOfficerMember
     
CS Financial        
Related Party Transaction [Line Items]        
Shares paid as merger consideration       173,791us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= banc_CSFinancialMember
Par value of stocks issued       $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_BusinessAcquisitionAxis
= banc_CSFinancialMember
Cash paid for acquisition       1,500,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= banc_CSFinancialMember
Earn-out liabilities       $ 3,200,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= banc_CSFinancialMember
CS Financial | Managing Director and Chief Lending Officer        
Related Party Transaction [Line Items]        
Shares paid as merger consideration       103,663us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= banc_CSFinancialMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_ManagingDirectorandChiefLendingOfficerMember
CS Financial | Brother of President and Chief Executive Officer        
Related Party Transaction [Line Items]        
Shares paid as merger consideration       16,140us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= banc_CSFinancialMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_BrotherofPresidentandChiefExecutiveOfficerMember
CS Financial | Sister-in-Law of President and Chief Executive Officer        
Related Party Transaction [Line Items]        
Shares paid as merger consideration       16,140us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= banc_CSFinancialMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_SisterinLawofPresidentandChiefExecutiveOfficerMember
Number of shares transferred from one related party to another related party       103,663banc_RelatedPartyTransactionBusinessAcquisitionEquityInterestIssuedorIssuableNumberofSharesTransferred
/ us-gaap_BusinessAcquisitionAxis
= banc_CSFinancialMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_SisterinLawofPresidentandChiefExecutiveOfficerMember
CS Financial | Father of President and Chief Executive Officer        
Related Party Transaction [Line Items]        
Shares paid as merger consideration       3,228us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= banc_CSFinancialMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_FatherofPresidentandChiefExecutiveOfficerMember
CS Financial | Certain Employees of Acquired Entity        
Related Party Transaction [Line Items]        
Shares paid as merger consideration       34,620us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= banc_CSFinancialMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_CertainEmployeesofAcquiredEntityMember
Performance Shares        
Related Party Transaction [Line Items]        
Number of shares       92,781banc_BusinessCombinationContingentConsiderationLiabilityNumberofShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Performance Shares | CS Financial | Managing Director and Chief Lending Officer        
Related Party Transaction [Line Items]        
Shares paid as merger consideration       28,545us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_BusinessAcquisitionAxis
= banc_CSFinancialMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_ManagingDirectorandChiefLendingOfficerMember
Performance Shares | CS Financial | Brother of President and Chief Executive Officer        
Related Party Transaction [Line Items]        
Shares paid as merger consideration       1,082us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_BusinessAcquisitionAxis
= banc_CSFinancialMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_BrotherofPresidentandChiefExecutiveOfficerMember
Performance Shares | CS Financial | Sister-in-Law of President and Chief Executive Officer        
Related Party Transaction [Line Items]        
Shares paid as merger consideration       1,082us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_BusinessAcquisitionAxis
= banc_CSFinancialMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_SisterinLawofPresidentandChiefExecutiveOfficerMember
Performance Shares | CS Financial | Father of President and Chief Executive Officer        
Related Party Transaction [Line Items]        
Shares paid as merger consideration       216us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_BusinessAcquisitionAxis
= banc_CSFinancialMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_FatherofPresidentandChiefExecutiveOfficerMember