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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Contractual Amount of Financial Instruments with Off-Balance-Sheet Risk (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Commitments to extend credit |  |
Other Commitments [Line Items] |  |
Fixed Rate | $ 2,167 | $ 1,851
Variable Rate | 288,770 | 335,654
Unused lines of credit |  |
Other Commitments [Line Items] |  |
Fixed Rate | 1,514 | 19,085
Variable Rate | 1,119,158 | 1,309,170
Letters of credit |  |
Other Commitments [Line Items] |  |
Fixed Rate | 1,266 | 1,050
Variable Rate | $ 8,561 | $ 12,976

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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: |

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