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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
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Mar. 31, 2015 Loan | Mar. 31, 2014 Loan
Troubled Debt Restructurings [Line Items] |  |
Number of Loans | 2 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2
Pre- Modification Outstanding Recorded Investment | $ 1,430 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 | $ 0 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Post-Modification Outstanding Recorded Investment | 1,430 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 | 0 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Single family residential mortgage |  |
Troubled Debt Restructurings [Line Items] |  |
Number of Loans | 2 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember
Pre- Modification Outstanding Recorded Investment | 1,430 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember | 0 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember
Post-Modification Outstanding Recorded Investment | $ 1,430 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember | $ 0 us-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 + Details
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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 + Details
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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 + Details
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