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Commitments and Contingencies - Years In Which Commitments are Expected to be Paid (Details) $ in Thousands	Sep. 30, 2025 USD ($)
Other Commitments [Line Items]
Commitments to contribute capital to small business investment companies and CRA-related loan pools	$ 107,365
2025
Other Commitments [Line Items]
Commitments to contribute capital to small business investment companies and CRA-related loan pools	53,683
2026
Other Commitments [Line Items]
Commitments to contribute capital to small business investment companies and CRA-related loan pools	$ 53,682

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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

X

- 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: