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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Additional Information (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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Affordable Housing Fund Investment |
Other Commitments [Line Items] |
Unfunded commitments | $ 18,300
Small Business Investment Companies |
Other Commitments [Line Items] |
Unfunded commitments | 5,600
Other Alternative Investments |
Other Commitments [Line Items] |
Unfunded commitments | $ 2,500

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- Definition Alternative Investments, Unfunded Investment Commitments + References No definition available. + Details
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Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_InvestmentTypeAxis=banc_SmallBusinessInvestmentCompaniesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_InvestmentTypeAxis=banc_OtherAlternativeInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |