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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 |
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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 | $ 12,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = banc_RentPaymentsReimbursementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_AffiliatedEntitywithCommonChiefExecutiveOfficerMember | $ 6,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = banc_RentPaymentsReimbursementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_AffiliatedEntitywithCommonChiefExecutiveOfficerMember | $ 11,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = banc_RentPaymentsReimbursementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_AffiliatedEntitywithCommonChiefExecutiveOfficerMember | $ 40,000 us-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 |  |  |  | 34,000 us-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 |  |  |  |  | 34,000 us-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 |  |  |  |  | 58,000 us-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 |  |  |  |  |  |  | 30,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_RelatedPartyTransactionAxis = banc_ConsultingAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_ImmediateFamilyMemberofChiefExecutiveOfficerBrotherMember | 1,200,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_RelatedPartyTransactionAxis = banc_ConsultingAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_ImmediateFamilyMemberofChiefExecutiveOfficerBrotherMember | 121,000 us-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 |  |  |  |  |  | 600,000 banc_RelatedPartyTransactionMinimumAggregatePayment / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_RelatedPartyTransactionAxis = banc_ConsultingAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_ImmediateFamilyMemberofChiefExecutiveOfficerBrotherMember |  |  |  |  |
Consulting agreement minimum payment |  |  |  |  |  | 30,000 banc_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 |  |  |  |  |  |  |  |  |  |  | 700,538 us-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 |  |  |  |  |  |  |  |  |  | 5,000,000 banc_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 |  |  |  |  |  |  |  |  |  | 7,500,000.0 banc_RelatedPartyTransactionExpectedInvestmentinLimitedPartnership / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_LimitedLiabilityCompanyMember |

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