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FAIR VALUES OF FINANCIAL INSTRUMENTS - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Servicing rights held for sale, carried at fair value	$ 0banc_ServicingAssetHeldForSale		$ 5,947banc_ServicingAssetHeldForSale
Valuation allowance for other real estate owned	22us-gaap_RealEstateOwnedValuationAllowanceProvision1	0us-gaap_RealEstateOwnedValuationAllowanceProvision1
Alternative investments liquidation period	10 years
Affordable Housing Fund Investment
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Alternative investments unfunded investment commitments	487banc_AlternativeInvestmentsUnfundedInvestmentCommitments / invest_InvestmentAxis = banc_AffordableHousingFundInvestmentMember
Small Business Investment Companies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Alternative investments unfunded investment commitments	7,200banc_AlternativeInvestmentsUnfundedInvestmentCommitments / invest_InvestmentAxis = banc_SmallBusinessInvestmentCompaniesMember
Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Servicing rights held for sale, carried at fair value	$ 0banc_ServicingAssetHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember		$ 5,900banc_ServicingAssetHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember

X

- Definition

Alternative Investments, Liquidation Period

+ References

No definition available.

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- Definition

Alternative Investments, Unfunded Investment Commitments

+ References

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X

- Definition

Servicing Asset, Held-For-Sale

+ References

No definition available.

+ Details

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- Definition

Amount of expense recognized in the income statement for a decrease in valuation of real estate owned (REO).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10(4))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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