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FAIR VALUES OF FINANCIAL INSTRUMENTS - Reconciliation of Assets Measured at Fair Value on Recurring Basis (Detail) (Mortgage servicing rights, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 19,082us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember	$ 13,535us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember
Transfers out of Level 3	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3 / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember	(9,185)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3 / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember
Total gains or losses (realized/unrealized):
Included in earnings—realized	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember
Included in earnings—fair value adjustment	(528)banc_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetFairValueAdjustmentIncludinginEarnings / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember	315banc_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetFairValueAdjustmentIncludinginEarnings / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember
Included in other comprehensive income	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember
Amortization of premium (discount)	0banc_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetAmortizationofPremiumDiscount / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember	0banc_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetAmortizationofPremiumDiscount / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember
Additions	10,192us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember	4,326us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember
Sales and settlements	(7,581)banc_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetSalesandSettlements / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember	(584)banc_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetSalesandSettlements / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember
Balance at end of period	$ 21,165us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember	$ 8,407us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember

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- Definition

Fair Value Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Amortization of Premium (Discount)

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- Definition

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- Definition

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- Definition

Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

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Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Publisher FASB

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- Definition

Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Publisher FASB

-Name Accounting Standards Codification

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