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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Additional Information (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Affordable Housing Fund Investment
Other Commitments [Line Items]
Unfunded commitments	$ 18,300
Small Business Investment Companies
Other Commitments [Line Items]
Unfunded commitments	5,600
Other Alternative Investments
Other Commitments [Line Items]
Unfunded commitments	$ 2,500

X

- Definition

Alternative Investments, Unfunded Investment Commitments

+ References

No definition available.

+ Details

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Namespace Prefix:	banc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=banc_SmallBusinessInvestmentCompaniesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=banc_OtherAlternativeInvestmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: