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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
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Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract] |  |
Outstanding Balance | $ 295,180 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance | $ 302,762 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance
Carrying Amount | 241,798 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet | 246,897 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
Commercial and industrial |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract] |  |
Outstanding Balance | 1,700 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_CommercialandIndustrialReceivableMember | 1,767 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_CommercialandIndustrialReceivableMember
Carrying Amount | 1,079 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_CommercialandIndustrialReceivableMember | 1,134 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_CommercialandIndustrialReceivableMember
Commercial real estate |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract] |  |
Outstanding Balance | 12,052 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateOtherReceivableMember | 13,708 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateOtherReceivableMember
Carrying Amount | 10,432 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateOtherReceivableMember | 11,527 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateOtherReceivableMember
SBA |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract] |  |
Outstanding Balance | 4,175 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_CommercialSmallBusinessAdministrationReceivableMember | 4,220 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_CommercialSmallBusinessAdministrationReceivableMember
Carrying Amount | 3,136 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_CommercialSmallBusinessAdministrationReceivableMember | 3,157 us-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 | 277,253 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember | 283,067 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember
Carrying Amount | $ 227,151 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_ConsumerSingleFamilyResidentialMortgageReceivableMember | $ 231,079 us-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 + Details
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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 + Details
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