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Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Commitments and Contingencies Disclosure [Abstract] |  |  |
Commitment To Contribute Capital to CRA Related Pool | $ 79,686 | $ 94,500 |
Reserve for Unfunded Loan Commitments | $ 29,071 | $ 29,571 | $ 91,071

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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

X
- Definition Reserve for Unfunded Loan Commitments + References No definition available. + Details
Name: | banc_ReserveforUnfundedLoanCommitments
Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration