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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
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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 | $ 19,082 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember | $ 13,535 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember
Transfers out of Level 3 | 0 us-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 | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember
Included in earnings—fair value adjustment | (528)banc_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetFairValueAdjustmentIncludinginEarnings / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember | 315 banc_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetFairValueAdjustmentIncludinginEarnings / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember
Included in other comprehensive income | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember
Amortization of premium (discount) | 0 banc_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetAmortizationofPremiumDiscount / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember | 0 banc_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetAmortizationofPremiumDiscount / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember
Additions | 10,192 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember | 4,326 us-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 | $ 21,165 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ServicingContractsMember | $ 8,407 us-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) + References No definition available. + Details
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- Definition Fair Value Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Fair Value Adjustment Including in Earnings + References No definition available. + Details
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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales and Settlements + References No definition available. + Details
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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 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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