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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
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Mar. 31, 2015 | May 21, 2014
Class of Stock [Line Items] |  |
Minimum settlement rate |  | 4.4456 banc_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchaseContractSettlementRateMinimumSettlementRate
Market value greater or equal to |  | $ 11.247 banc_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchaseContractMinimumSettlementRateMinimumMarketValuePerShare
Maximum settlement rate |  | 5.1124 banc_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchaseContractSettlementRateMaximumSettlementRate
Market value less than or equal to |  | $ 9.78 banc_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchaseContractMaximumSettlementRateMaximumMarketValuePerShare
Tangible equity units settled | 708,692 banc_PurchaseContractsConverted |
Issuance of shares of voting common stock | 3,150,561 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities |
Tangible equity units outstanding | 671,308 banc_PurchaseContractsOutstanding |
Junior Subordinated Debt | 7.50% Amortizing Note Due May 15, 2017 |  |
Class of Stock [Line Items] |  |
Tangible equity units issued during period, shares |  | 1,380,000 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
Proceeds from issuance of tangible equity units, net of issuance costs |  | $ 65.0 banc_ProceedsFromIssuanceOfTangibleEquityUnitsNetOfIssuanceCosts / 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
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 |  | 1.00 banc_TangibleEquityUnitsConvertiblePeriodicCashInstallmentsRate / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember
Installment payment due on August 15, 2014 per Amortizing Note |  | 0.933333 banc_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 |  | $ 50.00 banc_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 | 10.9 us-gaap_LongTermDebt / us-gaap_BalanceSheetLocationAxis = banc_NotesPayableMember / us-gaap_DebtInstrumentAxis = banc_SevenPointFivePercentAmortizingNoteDueMay152017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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