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STOCK COMPENSATION PLANS - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Aug. 21, 2012	Jul. 16, 2013	May 21, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 1,700us-gaap_AllocatedShareBasedCompensationExpense	$ 923us-gaap_AllocatedShareBasedCompensationExpense
Total income tax benefit/ (expense)	$ 694us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	$ 0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Minimum settlement rate					4.4456banc_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchaseContractSettlementRateMinimumSettlementRate
Market value greater or equal to					$ 11.247banc_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchaseContractMinimumSettlementRateMinimumMarketValuePerShare
Maximum settlement rate					5.1124banc_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchaseContractSettlementRateMaximumSettlementRate
Market value less than or equal to					$ 9.78banc_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchaseContractMaximumSettlementRateMaximumMarketValuePerShare
Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period of vested portion of all SARs following the cessation of service	90 days
5/21/2014 | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum settlement rate					4.4456banc_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchaseContractSettlementRateMinimumSettlementRate / us-gaap_AwardDateAxis = banc_AwardDateMay212014Member / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember
Market value greater or equal to					$ 11.247banc_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchaseContractMinimumSettlementRateMinimumMarketValuePerShare / us-gaap_AwardDateAxis = banc_AwardDateMay212014Member / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember
Maximum settlement rate					5.1124banc_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchaseContractSettlementRateMaximumSettlementRate / us-gaap_AwardDateAxis = banc_AwardDateMay212014Member / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember
Market value less than or equal to					$ 9.78banc_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchaseContractMaximumSettlementRateMaximumMarketValuePerShare / us-gaap_AwardDateAxis = banc_AwardDateMay212014Member / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember
Stock option awards | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Award expiration period	7 years
Stock option awards | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Award expiration period	10 years
Restricted stock awards and restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	80,670us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = banc_RestrictedStockAndRestrictedStockUnitsMember
Restricted stock awards and restricted stock units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Restricted stock awards and restricted stock units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Initial SAR | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period			10 years
SARs granted			500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardTypeAxis = banc_InitialStockAppreciationRightsMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember
Base price per share			$ 12.12us-gaap_SharePrice / us-gaap_AwardTypeAxis = banc_InitialStockAppreciationRightsMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember
Expiration period of vested portion of all SARs following the cessation of service			90 days
Initial SAR | 8/21/2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SARs granted	500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardDateAxis = banc_AwardDateAugust212012Member / us-gaap_AwardTypeAxis = banc_InitialStockAppreciationRightsMember
Base price per share	$ 12.12us-gaap_SharePrice / us-gaap_AwardDateAxis = banc_AwardDateAugust212012Member / us-gaap_AwardTypeAxis = banc_InitialStockAppreciationRightsMember
Initial SAR | Tranche One | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting award rights			33.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = banc_InitialStockAppreciationRightsMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheOneMember
Initial SAR | Tranche Two | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting award rights			33.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = banc_InitialStockAppreciationRightsMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheTwoMember
Initial SAR | Tranche Three | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting award rights			33.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = banc_InitialStockAppreciationRightsMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheThreeMember
Additional Stock Appreciation Rights I-V, VII | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period	10 years
Additional Stock Appreciation Rights I-V, VII | 5/21/2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SARs granted	252,023us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardDateAxis = banc_AwardDateMay212014Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember
Base price per share	$ 10.09us-gaap_SharePrice / us-gaap_AwardDateAxis = banc_AwardDateMay212014Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember
Additional Stock Appreciation Rights I-V, VII | Tranche One | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting award rights	33.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheOneMember
Additional Stock Appreciation Rights I-V, VII | Tranche Two | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting award rights	33.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheTwoMember
Additional Stock Appreciation Rights I-V, VII | Tranche Three | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting award rights	33.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightsIVVIIMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheThreeMember
Additional SAR VI | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage vested on settlement date	100.00%banc_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchaseContractAwardVestingRightsPercentageonSettlementDate / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightVIMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember
Additional SAR VI | 5/21/2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SARs granted	280,110us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardDateAxis = banc_AwardDateMay212014Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightVIMember
Base price per share	$ 10.09us-gaap_SharePrice / us-gaap_AwardDateAxis = banc_AwardDateMay212014Member / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightVIMember
Additional SAR VI | Tranche One | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting award rights	66.67%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightVIMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheOneMember
Additional SAR VI | Tranche Two | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting award rights	33.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = banc_AdditionalStockAppreciationRightVIMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheTwoMember
2013 Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares authorized percentage under the plan				20.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum / us-gaap_PlanNameAxis = banc_OmnibusStockIncentivePlanTwentyThirteenMember
Minimum requirement of number of shares authorized				2,384,711banc_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofSharesAuthorizedMinimumRequirement / us-gaap_PlanNameAxis = banc_OmnibusStockIncentivePlanTwentyThirteenMember
Common stock available under new plan	2,988,604us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = banc_OmnibusStockIncentivePlanTwentyThirteenMember

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Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Following Cessation of Service

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The number of grants made 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).

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Net number of non-option equity instruments granted to participants.

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