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Revenue From Contracts With Customers - Contract Balances (Details) - USD ($) $ in Thousands	6 Months Ended	9 Months Ended
	Jun. 30, 2025	Sep. 30, 2025
Statement of Financial Position [Abstract]
Receivables, which are included in "Other assets"	$ 1,679	$ 1,649
Contract liabilities, which are included in "Accrued interest payable and other liabilities"	$ 348	$ 296

X

- Definition

Contract With Customer, Liabilities Reclassified to Other Assets

+ References

No definition available.

+ Details

Name:	banc_ContractWithCustomerLiabilitiesReclassifiedtoOtherAssets
Namespace Prefix:	banc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract With Customer, Receivable Reclassified to Other Assets

+ References

No definition available.

+ Details

Name:	banc_ContractWithCustomerReceivableReclassifiedtoOtherAssets
Namespace Prefix:	banc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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