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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality Indicators Additional Information (Details) | 3 Months Ended
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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

X
- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration