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STOCK COMPENSATION PLANS - Summary of all Outstanding SARs (Detail) (USD $) | 3 Months Ended
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Mar. 31, 2015
Initial SAR | 8/21/2012 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares | 500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardDateAxis = banc_AwardDateAugust212012Member / us-gaap_AwardTypeAxis = banc_InitialStockAppreciationRightsMember
Base price per share | $ 12.12 us-gaap_SharePrice / us-gaap_AwardDateAxis = banc_AwardDateAugust212012Member / us-gaap_AwardTypeAxis = banc_InitialStockAppreciationRightsMember
Granted | $ 2.77 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardDateAxis = banc_AwardDateAugust212012Member / us-gaap_AwardTypeAxis = banc_InitialStockAppreciationRightsMember
Additional Stock Appreciation Rights I-V, VII | 6/21/2013 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares | 150,933 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardDateAxis = banc_AwardDateJune212013Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember
Base price per share | $ 13.06 us-gaap_SharePrice / us-gaap_AwardDateAxis = banc_AwardDateJune212013Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember
Granted | $ 2.38 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardDateAxis = banc_AwardDateJune212013Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember
Additional Stock Appreciation Rights I-V, VII | 7/1/2013 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares | 88,366 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardDateAxis = banc_AwardDateJuly12013Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember
Base price per share | $ 13.60 us-gaap_SharePrice / us-gaap_AwardDateAxis = banc_AwardDateJuly12013Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember
Granted | $ 2.17 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardDateAxis = banc_AwardDateJuly12013Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember
Additional Stock Appreciation Rights I-V, VII | 7/2/2013 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares | 15,275 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardDateAxis = banc_AwardDateJuly22013Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember
Base price per share | $ 13.55 us-gaap_SharePrice / us-gaap_AwardDateAxis = banc_AwardDateJuly22013Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember
Granted | $ 2.19 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardDateAxis = banc_AwardDateJuly22013Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember
Additional Stock Appreciation Rights I-V, VII | 12/10/2013 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares | 70,877 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardDateAxis = banc_AwardDateDecember102013Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember
Base price per share | $ 12.83 us-gaap_SharePrice / us-gaap_AwardDateAxis = banc_AwardDateDecember102013Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember
Granted | $ 2.47 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardDateAxis = banc_AwardDateDecember102013Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember
Additional Stock Appreciation Rights I-V, VII | 5/21/2014 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares | 252,023 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardDateAxis = banc_AwardDateMay212014Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember
Base price per share | $ 10.09 us-gaap_SharePrice / us-gaap_AwardDateAxis = banc_AwardDateMay212014Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember
Granted | $ 1.65 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardDateAxis = banc_AwardDateMay212014Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember
Additional Stock Appreciation Rights I-V, VII | 11/07/2014 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares | 216,334 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardDateAxis = banc_AwardDateNov72014Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember
Base price per share | $ 11.62 us-gaap_SharePrice / us-gaap_AwardDateAxis = banc_AwardDateNov72014Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember
Granted | $ 1.84 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardDateAxis = banc_AwardDateNov72014Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember
Additional SAR VI | 5/21/2014 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares | 280,110 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardDateAxis = banc_AwardDateMay212014Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightVIMember
Base price per share | $ 10.09 us-gaap_SharePrice / us-gaap_AwardDateAxis = banc_AwardDateMay212014Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightVIMember
Granted | $ 2.22 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardDateAxis = banc_AwardDateMay212014Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightVIMember

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of non-option equity instruments granted to participants. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
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