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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Loans and Leases by Class Modified as Troubled Debt Restructurings (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 Loan	Mar. 31, 2014 Loan
Troubled Debt Restructurings [Line Items]
Number of Loans	2us-gaap_FinancingReceivableModificationsNumberOfContracts2	0us-gaap_FinancingReceivableModificationsNumberOfContracts2
Pre- Modification Outstanding Recorded Investment	$ 1,430us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2	$ 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Post-Modification Outstanding Recorded Investment	1,430us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Single family residential mortgage
Troubled Debt Restructurings [Line Items]
Number of Loans	2us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember	0us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember
Pre- Modification Outstanding Recorded Investment	1,430us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember	0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember
Post-Modification Outstanding Recorded Investment	$ 1,430us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember	$ 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

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- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

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- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

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