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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 |  |  | $ 33,000,000.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = banc_SevenPointFiveZeroPercentSeniorNotesDueApril152020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | $ 45,000,000.0 us-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 |  |  | 25.00 banc_DebtInstrumentPricePerNote / us-gaap_DebtInstrumentAxis = banc_SevenPointFiveZeroPercentSeniorNotesDueApril152020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 25.00 banc_DebtInstrumentPricePerNote / us-gaap_DebtInstrumentAxis = banc_SevenPointFiveZeroPercentSeniorNotesDueApril152020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Net proceeds from issuance of debt after discounts |  | 50,100,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_DebtInstrumentAxis = banc_SevenPointFiveZeroPercentSeniorNotesDueApril152020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 31,700,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_DebtInstrumentAxis = banc_SevenPointFiveZeroPercentSeniorNotesDueApril152020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |
Exercise of underwriters' overallotment option |  | 6,800,000 banc_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 |  |  |  | 69,000,000 banc_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 |  |  |  | 1,380,000 banc_TangibleEquityUnitsIssuedShares / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |
Tangible equity units issued to underwriter during period, shares |  |  |  | 180,000 banc_TangibleEquityUnitsIssuedUnderwriterOverallotmentOption / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |
Tangible equity units, price per share |  |  |  | $ 50.00 banc_TangibleEquityUnitsIssuedStatedAmountPerUnit / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |
Tangible equity units, convertible, conversion ratio |  |  |  | 10.604556 banc_DebtInstrumentFaceAmountPerNote / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |
Fair value of debt instrument |  |  |  | 14,600,000 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |
Adjustments to additional paid in capital, issuance of tangible equity units |  |  |  | 54,400,000 banc_AdjustmentstoAdditionalPaidinCapitalTangibleEquityUnitsIssuedValue / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |
Tangible equity units issued, issuance costs |  |  |  | 4,000,000 banc_PaymentofTangibleUnitsIssuedIssuanceCosts / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |
Tangible equity units issued, issuance costs, underwriter discount |  |  |  | 3,300,000 banc_PaymentofTangibleUnitsIssuedIssuanceCostsUnderwriterDiscount / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |
Debt instrument, deferred finance cost |  |  |  | 857,000 banc_PaymentofTangibleUnitsIssuedIssuanceCostsAllocatedtoDebt / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |
Adjustments to additional paid in capital, tangible equity units issued, issuance costs |  |  |  | 3,200,000 banc_PaymentofTangibleUnitsIssuedIssuanceCostsAllocatedtoEquity / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |
Proceeds from issuance of tangible equity units, net of issuance costs |  |  |  | $ 65,000,000 banc_ProceedsFromIssuanceOfTangibleEquityUnitsNetOfIssuanceCosts / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |

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