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STOCKHOLDERS' EQUITY - Tangible Equity Units (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	0 Months Ended
	Mar. 31, 2015	May 21, 2014
Class of Stock [Line Items]
Minimum settlement rate		4.4456banc_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchaseContractSettlementRateMinimumSettlementRate
Market value greater or equal to		$ 11.247banc_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchaseContractMinimumSettlementRateMinimumMarketValuePerShare
Maximum settlement rate		5.1124banc_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchaseContractSettlementRateMaximumSettlementRate
Market value less than or equal to		$ 9.78banc_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchaseContractMaximumSettlementRateMaximumMarketValuePerShare
Tangible equity units settled	708,692banc_PurchaseContractsConverted
Issuance of shares of voting common stock	3,150,561us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
Tangible equity units outstanding	671,308banc_PurchaseContractsOutstanding
Junior Subordinated Debt | 7.50% Amortizing Note Due May 15, 2017
Class of Stock [Line Items]
Tangible equity units issued during period, shares		1,380,000banc_TangibleEquityUnitsIssuedShares / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember
Tangible equity units issued to underwriter during period, shares		180,000banc_TangibleEquityUnitsIssuedUnderwriterOverallotmentOption / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember
Proceeds from issuance of tangible equity units, net of issuance costs		$ 65.0banc_ProceedsFromIssuanceOfTangibleEquityUnitsNetOfIssuanceCosts / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember
Tangible equity units, convertible, conversion ratio		10.604556banc_DebtInstrumentFaceAmountPerNote / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember
Stated interest rate		7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember
Equal quarterly cash installments per Amortizing Note		1.00banc_TangibleEquityUnitsConvertiblePeriodicCashInstallmentsRate / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember
Installment payment due on August 15, 2014 per Amortizing Note		0.933333banc_TangibleEquityUnitsConvertibleFirstPeriodicCashInstallmentsRate / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember
Tangible equity units dividend rate		8.00%banc_TangibleEquityUnitsRate / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember
Tangible equity units, price per share		$ 50.00banc_TangibleEquityUnitsIssuedStatedAmountPerUnit / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember
Junior Subordinated Debt | 7.50% Amortizing Note Due May 15, 2017 | Notes Payable
Class of Stock [Line Items]
Long-term debt	10.9us-gaap_LongTermDebt / us-gaap_BalanceSheetLocationAxis = banc_NotesPayableMember / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember

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Contractual interest rate for funds borrowed, under the debt agreement.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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