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RELATED-PARTY TRANSACTIONS - Transactions Involving Steven A. Sugarman (Details) (USD $)
1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Nov. 30, 2013
Dec. 31, 2013
Jun. 27, 2014
Jul. 01, 2013
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Nov. 24, 2014
Feb. 14, 2012
COR Securities Holding, Inc. (CORSHI) | Rent Payments Reimbursement                      
Related Party Transaction [Line Items]                      
Expenses from transactions with related parties $ 12,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= banc_RentPaymentsReimbursementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_AffiliatedEntitywithCommonChiefExecutiveOfficerMember
$ 6,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= banc_RentPaymentsReimbursementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_AffiliatedEntitywithCommonChiefExecutiveOfficerMember
$ 11,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= banc_RentPaymentsReimbursementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_AffiliatedEntitywithCommonChiefExecutiveOfficerMember
$ 40,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= banc_RentPaymentsReimbursementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_AffiliatedEntitywithCommonChiefExecutiveOfficerMember
             
COR Securities Holding, Inc. (CORSHI) | Security Deposit                      
Related Party Transaction [Line Items]                      
Expenses from transactions with related parties       34,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= banc_SecurityDepositMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_AffiliatedEntitywithCommonChiefExecutiveOfficerMember
             
COR Securities Holding, Inc. (CORSHI) | Intercompany Transaction                      
Related Party Transaction [Line Items]                      
Expenses from transactions with related parties         34,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= banc_IntercompanyTransactionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_AffiliatedEntitywithCommonChiefExecutiveOfficerMember
           
COR Securities Holding, Inc. (CORSHI) | Leasing Costs Payments                      
Related Party Transaction [Line Items]                      
Expenses from transactions with related parties         58,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= banc_LeasingCostsPaymentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_AffiliatedEntitywithCommonChiefExecutiveOfficerMember
           
Immediate Family Member of Chief Executive Officer, Brother | Consulting Agreement | Subsidiaries                      
Related Party Transaction [Line Items]                      
Expenses from transactions with related parties             30,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RelatedPartyTransactionAxis
= banc_ConsultingAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_ImmediateFamilyMemberofChiefExecutiveOfficerBrotherMember
1,200,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RelatedPartyTransactionAxis
= banc_ConsultingAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_ImmediateFamilyMemberofChiefExecutiveOfficerBrotherMember
121,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RelatedPartyTransactionAxis
= banc_ConsultingAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_ImmediateFamilyMemberofChiefExecutiveOfficerBrotherMember
   
Consulting agreement term           5 years          
Consulting agreement payment           600,000banc_RelatedPartyTransactionMinimumAggregatePayment
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RelatedPartyTransactionAxis
= banc_ConsultingAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_ImmediateFamilyMemberofChiefExecutiveOfficerBrotherMember
         
Consulting agreement minimum payment           30,000banc_RelatedPartyTransactionMinimumQuarterlyPayments
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RelatedPartyTransactionAxis
= banc_ConsultingAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_ImmediateFamilyMemberofChiefExecutiveOfficerBrotherMember
         
Prior notice period           30 days          
Limited Liability Company                      
Related Party Transaction [Line Items]                      
Common stock, shares outstanding                     700,538us-gaap_CommonStockSharesOutstanding
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedLiabilityCompanyMember
Percentage of total shares outstanding                     2.00%banc_CommonStockPercentageofTotalSharesOutstanding
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedLiabilityCompanyMember
Percent ownership in limited partnership                   9.90%banc_RelatedPartyTransactionPercentOwnershipinLimitedPartnership
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedLiabilityCompanyMember
 
Minimum | Limited Liability Company                      
Related Party Transaction [Line Items]                      
Expected investment in limited partnership                   5,000,000banc_RelatedPartyTransactionExpectedInvestmentinLimitedPartnership
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedLiabilityCompanyMember
 
Maximum | Limited Liability Company                      
Related Party Transaction [Line Items]                      
Expected investment in limited partnership                   7,500,000.0banc_RelatedPartyTransactionExpectedInvestmentinLimitedPartnership
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedLiabilityCompanyMember