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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Credit Quality Indicators and PCI Loans Additional Information (Details) - bulk_loan_acquisition | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Receivables [Abstract] |  |
Loans delinquent | 60 days |
Number of bulk acquisitions | 0 | 0

X
- Definition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Number of Bulk Loan Acquisitions + References No definition available. + Details
Name: | banc_CertainLoansAcquiredinTransferNotAccountedforasDebtSecuritiesAcquiredDuringPeriodNumberofBulkLoanAcquisitions
Namespace Prefix: | banc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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