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SECURITIES AVAILABLE FOR SALE - Additional Information (Detail) (USD $)	Mar. 31, 2015 security	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, pledged	$ 32,200,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral	$ 27,100,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Securities available for sale portfolio	96banc_NumberOfAvailableForSaleSecuritiesInPortfolio
Securities in unrealized loss position	33us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
Amount of rated securities portfolio	393,586,000us-gaap_AvailableForSaleSecuritiesDebtSecurities	345,695,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
AAA, AA or A
Schedule of Available-for-sale Securities [Line Items]
Amount of rated securities portfolio	392,500,000us-gaap_AvailableForSaleSecuritiesDebtSecurities / invest_CreditRatingSourceAxis = banc_VariousCreditRatingOrganizationsRatingAorBetterMember
BBB
Schedule of Available-for-sale Securities [Line Items]
Amount of rated securities portfolio	$ 1,000,000us-gaap_AvailableForSaleSecuritiesDebtSecurities / invest_CreditRatingSourceAxis = banc_VariousCreditRatingOrganizationsRatingBBBMember

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- Definition

Number of available for sale securities in portfolio.

+ References

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Amount of debt securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

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Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

+ References

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-Topic 320

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- Definition

The fair value of available-for-sale securities that serve as collateral for borrowings.

+ References

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-Name Accounting Standards Codification

-Topic 310

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