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LONG TERM DEBT - Additional Information (Detail) (USD $)	3 Months Ended	0 Months Ended
	Mar. 31, 2015	Dec. 07, 2012	Apr. 23, 2012	May 21, 2014	Dec. 06, 2012
Senior Notes
Debt Instrument [Line Items]
Minimum redemption period notice required	30 days
Maximum redemption period notice required	60 days
Redemption price, percentage	100.00%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Senior Notes | 7.50% Senior Notes Due April 15, 2020
Debt Instrument [Line Items]
Aggregate principal amount issued			$ 33,000,000.0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = banc_SevenPointFiveZeroPercentSeniorNotesDueApril152020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember		$ 45,000,000.0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = banc_SevenPointFiveZeroPercentSeniorNotesDueApril152020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Stated interest rate	7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = banc_SevenPointFiveZeroPercentSeniorNotesDueApril152020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember		7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = banc_SevenPointFiveZeroPercentSeniorNotesDueApril152020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Sale price of notes to public			25.00banc_DebtInstrumentPricePerNote / us-gaap_DebtInstrumentAxis = banc_SevenPointFiveZeroPercentSeniorNotesDueApril152020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember		25.00banc_DebtInstrumentPricePerNote / us-gaap_DebtInstrumentAxis = banc_SevenPointFiveZeroPercentSeniorNotesDueApril152020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Net proceeds from issuance of debt after discounts		50,100,000us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_DebtInstrumentAxis = banc_SevenPointFiveZeroPercentSeniorNotesDueApril152020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember	31,700,000us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_DebtInstrumentAxis = banc_SevenPointFiveZeroPercentSeniorNotesDueApril152020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Exercise of underwriters' overallotment option		6,800,000banc_DebtInstrumentUnderwritersOverallotmentOptionExercised / us-gaap_DebtInstrumentAxis = banc_SevenPointFiveZeroPercentSeniorNotesDueApril152020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Junior Subordinated Debt | 7.50% Amortizing Note Due May 15, 2017
Debt Instrument [Line Items]
Stated interest rate				7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember
Gross proceeds from issuance of tangible equity units				69,000,000banc_TangibleEquityUnitsIssuedValue / 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 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
Tangible equity units, price per share				$ 50.00banc_TangibleEquityUnitsIssuedStatedAmountPerUnit / 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
Fair value of debt instrument				14,600,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember
Adjustments to additional paid in capital, issuance of tangible equity units				54,400,000banc_AdjustmentstoAdditionalPaidinCapitalTangibleEquityUnitsIssuedValue / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember
Tangible equity units issued, issuance costs				4,000,000banc_PaymentofTangibleUnitsIssuedIssuanceCosts / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember
Tangible equity units issued, issuance costs, underwriter discount				3,300,000banc_PaymentofTangibleUnitsIssuedIssuanceCostsUnderwriterDiscount / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember
Debt instrument, deferred finance cost				857,000banc_PaymentofTangibleUnitsIssuedIssuanceCostsAllocatedtoDebt / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember
Adjustments to additional paid in capital, tangible equity units issued, issuance costs				3,200,000banc_PaymentofTangibleUnitsIssuedIssuanceCostsAllocatedtoEquity / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember
Proceeds from issuance of tangible equity units, net of issuance costs				$ 65,000,000banc_ProceedsFromIssuanceOfTangibleEquityUnitsNetOfIssuanceCosts / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember

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-SubTopic 30

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