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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Credit Quality Indicators Additional Information (Details) | 9 Months Ended
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Sep. 30, 2018
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