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MORTGAGE BANKING ACTIVITIES - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Originations of loans held for sale from mortgage banking	$ 1,007,720,000us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale	$ 511,451,000us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale
Proceeds from sale of mortgage loans held-for-sale	927,700,000us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale	531,800,000us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale
Net gain on sale of mortgage loans held for sale	34,400,000us-gaap_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale	15,200,000us-gaap_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale
Margin on sale of mortgage loans held for sale	3.41%banc_SecuritizationorAssetbackedFinancingArrangementFinancialAssetforwhichTransferisAccountedasSaleMargin	2.96%banc_SecuritizationorAssetbackedFinancingArrangementFinancialAssetforwhichTransferisAccountedasSaleMargin
Loan origination fees	3,500,000banc_SecuritizationorAssetbackedFinancingArrangementFinancialAssetforwhichTransferisAccountedasSaleOriginationFee	2,200,000banc_SecuritizationorAssetbackedFinancingArrangementFinancialAssetforwhichTransferisAccountedasSaleOriginationFee
Loans sold	9,800,000banc_TransfersOfFinancialAssetsAccountedForAsSaleInitialFairValueOfAssetsObtainedAsProceedsSold	4,800,000banc_TransfersOfFinancialAssetsAccountedForAsSaleInitialFairValueOfAssetsObtainedAsProceedsSold
Provision for loss reimbursement on sold loans	845,000banc_ProvisionforLoanRepurchasesInitialEstimateofLoss	571,000banc_ProvisionforLoanRepurchasesInitialEstimateofLoss
Representations and Warranties Obligations and Corporate Guarantees
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Provision for loss reimbursement on sold loans	1,300,000banc_ProvisionforLoanRepurchasesInitialEstimateofLoss / us-gaap_LossContingenciesByNatureOfContingencyAxis = banc_RepresentationsandWarrantiesObligationsandCorporateGuaranteesMember	571,000banc_ProvisionforLoanRepurchasesInitialEstimateofLoss / us-gaap_LossContingenciesByNatureOfContingencyAxis = banc_RepresentationsandWarrantiesObligationsandCorporateGuaranteesMember
Initial provision for loan repurchases	$ 483,000banc_LossContingencyAccrualProvisionInitialLoanRepurchases / us-gaap_LossContingenciesByNatureOfContingencyAxis = banc_RepresentationsandWarrantiesObligationsandCorporateGuaranteesMember

X

- Definition

Loss Contingency, Accrual, Provision, Initial Loan Repurchases

+ References

No definition available.

+ Details

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Namespace Prefix:	banc_
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Balance Type:	debit
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X

- Definition

Provision charged for the period based on estimated losses for sold loans that may have to be subsequently repurchased and amounts that may have to be paid to reimburse certain investor losses due to defects that occurred in the origination of the loans.

+ References

No definition available.

+ Details

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X

- Definition

Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale, Margin

+ References

No definition available.

+ Details

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Namespace Prefix:	banc_
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Balance Type:	na
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X

- Definition

Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale, Origination Fee

+ References

No definition available.

+ Details

Name:	banc_SecuritizationorAssetbackedFinancingArrangementFinancialAssetforwhichTransferisAccountedasSaleOriginationFee
Namespace Prefix:	banc_
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X

- Definition

Transfers Of Financial Assets Accounted For As Sale, Initial Fair Value Of Assets Obtained As Proceeds, Sold

+ References

No definition available.

+ Details

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Namespace Prefix:	banc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of cash paid for the origination of mortgages that are held for sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

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X

- Definition

The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 21

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3461-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Reflects, by transferred financial asset type, the amount of sales proceeds in excess of or deficient from the sum of the carrying amounts of transferred financial assets plus transaction costs, including those transactions in which the seller/transferor has continuing involvement with the financial assets that have been transferred.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107207-111719



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 10

-Section 40

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=45353237&loc=d3e96813-111708

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