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SERVICING RIGHTS - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Transfers and Servicing [Abstract]
Income earned on mortgage servicing rights	$ (442,000)us-gaap_ServicingFeesNet	$ 1,253,000us-gaap_ServicingFeesNet
Unpaid principal balance	2,120,000,000us-gaap_DerecognizedAssetsSecuritizedOrAssetbackedFinancingArrangementAssetsAndAnyOtherFinancialAssetsManagedTogetherPrincipalAmountOutstanding		1,920,000,000us-gaap_DerecognizedAssetsSecuritizedOrAssetbackedFinancingArrangementAssetsAndAnyOtherFinancialAssetsManagedTogetherPrincipalAmountOutstanding
Escrow balances	8,100,000banc_ContinuingInvolvementwithDerecognizedTransferredFinancialAssetsRecordedEscrowBalance		8,300,000banc_ContinuingInvolvementwithDerecognizedTransferredFinancialAssetsRecordedEscrowBalance
Discount rate	7.25%banc_ServicingAssetatAmortizedCostDiscountRate
Prepayment speed	7.25%banc_ServicingAssetatAmortizedCostPrepaymentSpeedCalculationPercentage
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Servicing rights held for sale, carried at fair value	0banc_ServicingAssetHeldForSale		5,947,000banc_ServicingAssetHeldForSale
Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Servicing rights held for sale, carried at fair value	$ 0banc_ServicingAssetHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember		$ 5,900,000banc_ServicingAssetHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember

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- Definition

Continuing Involvement with Derecognized Transferred Financial Assets, Recorded Escrow Balance

+ References

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- Definition

Servicing Asset at Amortized Cost, Discount Rate

+ References

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- Definition

Servicing Asset at Amortized Cost, Prepayment Speed Calculation, Percentage

+ References

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- Definition

Servicing Asset, Held-For-Sale

+ References

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- Definition

Amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that have been derecognized. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107314-111719

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- Definition

Amount of revenue from servicing real estate mortgages, credit cards, and other financial assets held by others. Includes premiums received in lieu of regular servicing fees.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 13

-Article 9



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.13 (d))

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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