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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Components of Troubled Debt Restructured Loans and Leases (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2013
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Commercial real estate |  |
Troubled Debt Restructurings [Line Items] |  |
Troubled debt restructured loans and leases | $ 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateOtherReceivableMember | $ 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateOtherReceivableMember
SBA |  |
Troubled Debt Restructurings [Line Items] |  |
Troubled debt restructured loans and leases | 9 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_CommercialSmallBusinessAdministrationReceivableMember | 6 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_CommercialSmallBusinessAdministrationReceivableMember
Single family residential mortgage |  |
Troubled Debt Restructurings [Line Items] |  |
Troubled debt restructured loans and leases | 4,543 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember | 4,269 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember
Consumer Home Equity Loan | Green Loans (HELOC) - first liens |  |
Troubled Debt Restructurings [Line Items] |  |
Troubled debt restructured loans and leases | 4,549 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerHomeEquityLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember | 3,442 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerHomeEquityLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember
Consumer Home Equity Loan | Second lien |  |
Troubled Debt Restructurings [Line Items] |  |
Troubled debt restructured loans and leases | 294 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerHomeEquityLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember | 294 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerHomeEquityLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember
Other consumer |  |
Troubled Debt Restructurings [Line Items] |  |
Troubled debt restructured loans and leases | 9,395 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember | 8,011 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember
Non-Traditional Mortgages (NTM) | Commercial real estate |  |
Troubled Debt Restructurings [Line Items] |  |
Troubled debt restructured loans and leases | 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateOtherReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_NonTraditionalMortgagesLoanMember | 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateOtherReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_NonTraditionalMortgagesLoanMember
Non-Traditional Mortgages (NTM) | SBA |  |
Troubled Debt Restructurings [Line Items] |  |
Troubled debt restructured loans and leases | 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_CommercialSmallBusinessAdministrationReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_NonTraditionalMortgagesLoanMember | 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_CommercialSmallBusinessAdministrationReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_NonTraditionalMortgagesLoanMember
Non-Traditional Mortgages (NTM) | Single family residential mortgage |  |
Troubled Debt Restructurings [Line Items] |  |
Troubled debt restructured loans and leases | 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_NonTraditionalMortgagesLoanMember | 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_NonTraditionalMortgagesLoanMember
Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - first liens |  |
Troubled Debt Restructurings [Line Items] |  |
Troubled debt restructured loans and leases | 4,549 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerHomeEquityLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember | 3,442 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerHomeEquityLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember
Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Second lien |  |
Troubled Debt Restructurings [Line Items] |  |
Troubled debt restructured loans and leases | 294 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerHomeEquityLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember | 294 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerHomeEquityLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember
Non-Traditional Mortgages (NTM) | Other consumer |  |
Troubled Debt Restructurings [Line Items] |  |
Troubled debt restructured loans and leases | 4,843 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_NonTraditionalMortgagesLoanMember | 3,736 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_NonTraditionalMortgagesLoanMember
Traditional Loans | Commercial real estate |  |
Troubled Debt Restructurings [Line Items] |  |
Troubled debt restructured loans and leases | 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateOtherReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_TraditionalLoansMember | 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateOtherReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_TraditionalLoansMember
Traditional Loans | SBA |  |
Troubled Debt Restructurings [Line Items] |  |
Troubled debt restructured loans and leases | 9 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_CommercialSmallBusinessAdministrationReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_TraditionalLoansMember | 6 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_CommercialSmallBusinessAdministrationReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_TraditionalLoansMember
Traditional Loans | Single family residential mortgage |  |
Troubled Debt Restructurings [Line Items] |  |
Troubled debt restructured loans and leases | 4,543 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_TraditionalLoansMember | 4,269 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_TraditionalLoansMember
Traditional Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens |  |
Troubled Debt Restructurings [Line Items] |  |
Troubled debt restructured loans and leases | 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerHomeEquityLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_TraditionalLoansMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember | 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerHomeEquityLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_TraditionalLoansMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember
Traditional Loans | Consumer Home Equity Loan | Second lien |  |
Troubled Debt Restructurings [Line Items] |  |
Troubled debt restructured loans and leases | 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerHomeEquityLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_TraditionalLoansMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember | 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerHomeEquityLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_TraditionalLoansMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember
Traditional Loans | Other consumer |  |
Troubled Debt Restructurings [Line Items] |  |
Troubled debt restructured loans and leases | $ 4,552 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_TraditionalLoansMember | $ 4,275 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerOtherFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = banc_TraditionalLoansMember

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- Definition The amount of the outstanding recorded investment related to 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 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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