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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Reserve for Unfunded Loan Commitments	$ 30,221	$ 29,221	$ 29,071	$ 27,571	$ 27,571	$ 29,571
Commitment to contribute capital	$ 107,400		$ 79,700

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- Definition

Commitment To Contribute Capital

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No definition available.

+ Details

Name:	banc_CommitmentToContributeCapital
Namespace Prefix:	banc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Reserve for Unfunded Loan Commitments

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No definition available.

+ Details

Name:	banc_ReserveforUnfundedLoanCommitments
Namespace Prefix:	banc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration