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STOCK COMPENSATION PLANS - Summary of all Outstanding SARs (Footnotes) (Detail) (Additional SAR VI) | 3 Months Ended
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Mar. 31, 2015
Additional SAR VI |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Additional SAR original shares of common stock a scheduled vesting | 300,219 banc_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsGross / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightVIMember
Additional SAR accelerated in vesting | 143,849 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightVIMember
TEU Additional SAR forfeited | 20,109 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightVIMember

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Gross + References No definition available. + Details
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Namespace Prefix: | banc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration