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RELATED-PARTY TRANSACTIONS - Transaction Involving Halle Benett and Former Chairman Timothy R. Chrisman (Details) (USD $)	0 Months Ended
	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	$ 200,000us-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		5,150,000us-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		521,000us-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		481,000banc_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		5,150,000us-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		772,500us-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			592,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = banc_UnderwritingFeesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_DirectorMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember	263,000us-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			4,000,000banc_DepositorySharesIssued / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_SubsidiarySaleOfStockAxis = banc_UnderwrittenPublicOfferingMember
Price per share of depository shares (in usd per share)			25.00banc_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			600,000banc_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				175,000,000us-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			1,000us-gaap_PreferredStockLiquidationPreferenceValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_SubsidiarySaleOfStockAxis = banc_UnderwrittenPublicOfferingMember

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