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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Carrying Amount of Purchased Credit Impaired Loans and Leases (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]
Outstanding Balance	$ 295,180us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance	$ 302,762us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance
Carrying Amount	241,798us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet	246,897us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
Commercial and industrial
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]
Outstanding Balance	1,700us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_CommercialandIndustrialReceivableMember	1,767us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_CommercialandIndustrialReceivableMember
Carrying Amount	1,079us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_CommercialandIndustrialReceivableMember	1,134us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_CommercialandIndustrialReceivableMember
Commercial real estate
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]
Outstanding Balance	12,052us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateOtherReceivableMember	13,708us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateOtherReceivableMember
Carrying Amount	10,432us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateOtherReceivableMember	11,527us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateOtherReceivableMember
SBA
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]
Outstanding Balance	4,175us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_CommercialSmallBusinessAdministrationReceivableMember	4,220us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_CommercialSmallBusinessAdministrationReceivableMember
Carrying Amount	3,136us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_CommercialSmallBusinessAdministrationReceivableMember	3,157us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_CommercialSmallBusinessAdministrationReceivableMember
Single family residential mortgage
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]
Outstanding Balance	277,253us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember	283,067us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember
Carrying Amount	$ 227,151us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember	$ 231,079us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember

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- Definition

The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 15

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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- Definition

The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 15

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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