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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality Indicators Additional Information (Details)	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Loans delinquent	60 days

X

- Definition

Number of days delinquent at which a loan or lease is individually analyzed.

+ References

No definition available.

+ Details

Name:	banc_FinancingReceivableDaysDelinquentClassifiedAsCreditRisk
Namespace Prefix:	banc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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