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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality Indicators Additional Information (Details)	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Delinquency period (over)	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

X

- References

No definition available.

+ Details

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