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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Contractual Amount of Financial Instruments with Off-Balance-Sheet Risk (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Commitments to extend credit |  |
Other Commitments [Line Items] |  |
Fixed Rate | $ 79,781 | $ 74,777
Variable Rate | 234,675 | 201,321
Unused lines of credit |  |
Other Commitments [Line Items] |  |
Fixed Rate | 27,071 | 27,151
Variable Rate | 925,872 | 888,236
Letters of credit |  |
Other Commitments [Line Items] |  |
Fixed Rate | 2,056 | 1,784
Variable Rate | 9,360 | 8,655
Banc Home Loan | Commitments to extend credit | Discontinued Operations |  |
Other Commitments [Line Items] |  |
Commitments to extend credit | $ 77,700 | $ 65,100

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- Definition Disposal Group, Including Discontinued Operations, Other Commitments, Off-Balance Sheet Risk + References No definition available. + Details
Name: | banc_DisposalGroupIncludingDiscontinuedOperationsOtherCommitmentsOffBalanceSheetRisk
Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Other Commitments, Off-Balance Sheet Risk, Fixed Rate Financial Instrument + References No definition available. + Details
Name: | banc_OtherCommitmentsOffBalanceSheetRiskFixedRateFinancialInstrument
Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Other Commitments, Off-Balance Sheet Risk, Variable Rate Financial Instrument + References No definition available. + Details
Name: | banc_OtherCommitmentsOffBalanceSheetRiskVariableRateFinancialInstrument
Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_UnusedLinesOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=banc_BancHomeLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_SegmentDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |