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RELATED-PARTY TRANSACTIONS - Transaction Involving Halle Benett and Former Chairman Timothy R. Chrisman (Details) (USD $) | 0 Months Ended
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May 15, 2014 | May 21, 2014 | Apr. 08, 2015 | Apr. 06, 2015
Former Chairman | Former Management Member |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related parties | $ 200,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = banc_FormerManagementMemberMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_FormerChairmanMember |  |  |
Strategic advisor agreement period | 1 year |  |  |
Common Stock |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Issuance of stock shares |  | 5,150,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Underwriters option period |  | 30 days |  |
Common Stock | Director | Underwriting Fees |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related parties |  | 521,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = banc_UnderwritingFeesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_DirectorMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Expenses from transactions with related parties, net of related expenses |  | 481,000 banc_RelatedPartyTransactionExpensesfromTransactionswithRelatedPartyNet / us-gaap_RelatedPartyTransactionAxis = banc_UnderwritingFeesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_DirectorMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Common Stock | Underwritten Public Offering |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Issuance of stock shares |  | 5,150,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = banc_UnderwrittenPublicOfferingMember |  |
Common Stock | Over Allotment Option |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Issuance of stock shares |  | 772,500 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_OverAllotmentOptionMember |  |
Underwriters option period |  | 30 days |  |
Subsequent Event |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Underwriters option period |  |  | 30 days |
Subsequent Event | Director | Underwriting Fees |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related parties |  |  | 592,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = banc_UnderwritingFeesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_DirectorMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 263,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = banc_UnderwritingFeesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_DirectorMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent Event | Underwritten Public Offering |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Depository shares issued |  |  | 4,000,000 banc_DepositorySharesIssued / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_SubsidiarySaleOfStockAxis = banc_UnderwrittenPublicOfferingMember |
Price per share of depository shares (in usd per share) |  |  | 25.00 banc_DepositorySharesIssuedPricePerShare / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_SubsidiarySaleOfStockAxis = banc_UnderwrittenPublicOfferingMember |
Subsequent Event | Over Allotment Option |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Depository shares issued |  |  | 600,000 banc_DepositorySharesIssued / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_OverAllotmentOptionMember |
Subsequent Event | Five Point Two Five Percent Senior Notes Due April 15, 2025 | Senior Notes |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Aggregate principal amount issued |  |  |  | 175,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = banc_FivePointTwoFivePercentSeniorNotesDueApril152025Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Stated interest rate |  |  |  | 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = banc_FivePointTwoFivePercentSeniorNotesDueApril152025Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Series D Preferred Stock | Subsequent Event |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Depository shares to preferred stock ratio |  |  | 2.50%banc_DepositorySharesToPreferredStockRatio / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Series D Preferred Stock | Subsequent Event | Underwritten Public Offering |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Depository shares to preferred stock ratio |  |  | 2.50%banc_DepositorySharesToPreferredStockRatio / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_SubsidiarySaleOfStockAxis = banc_UnderwrittenPublicOfferingMember |
Non cumulative preferred stock, dividend rate |  |  | 7.375%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_SubsidiarySaleOfStockAxis = banc_UnderwrittenPublicOfferingMember |
Liquidation preference value |  |  | 1,000 us-gaap_PreferredStockLiquidationPreferenceValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_SubsidiarySaleOfStockAxis = banc_UnderwrittenPublicOfferingMember |

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