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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Other Commitments [Line Items]
Unfunded commitments	$ 17,480	$ 10,264
LIHTCInvestments
Other Commitments [Line Items]
Unfunded commitments	17,500	10,300
Small Business Investment Companies
Other Commitments [Line Items]
Unfunded commitments	8,600	7,100
Other Alternative Investments
Other Commitments [Line Items]
Unfunded commitments	$ 5,800	$ 5,000

X

- Definition

Alternative Investments, Unfunded Investment Commitments

+ References

No definition available.

+ Details

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Balance Type:	credit
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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

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Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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

X

- Details

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Namespace Prefix:
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Period Type: