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Commitments and Contingencies Commitments and Contingencies (Details 1) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Other Commitments [Line Items] |  |
Commitment To Contribute Capital to CRA Related Pool | $ 79,686 | $ 94,500
Less Than One Year |  |
Other Commitments [Line Items] |  |
Commitment To Contribute Capital to CRA Related Pool | 39,843 |
More Than Twelve (12) Months but Less Than Twenty-four (24) Months |  |
Other Commitments [Line Items] |  |
Commitment To Contribute Capital to CRA Related Pool | $ 39,843 |

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- Definition Commitment To Contribute Capital to CRA Related Pool + References No definition available. + Details
Name: | banc_CommitmentToContributeCapitaltoCRARelatedPool
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_OtherCommitmentsAxis=banc_LessThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=banc_MoreThanTwelve12MonthsbutLessThanTwentyfour24MonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |