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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance for Loan and Lease Losses (Details) - SBA | 12 Months Ended
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Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items] |
Percentage of credit enhancement for loans up to $150,000 (percent) | 85.00%
Percentage of credit enhancement for loans greater than $150,000 (percent) | 75.00%

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- Definition Loans and Leases Receivable, Percentage of Credit Enhancement For Loans Up To $150,000 + References No definition available. + Details
Name: | banc_LoansandLeasesReceivablePercentageofCreditEnhancementForLoansUpTo150000
Namespace Prefix: | banc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Loans and Leases Receivable, Percentage of Credit Enhancement for Loans Greater than $150,000 + References No definition available. + Details
Name: | banc_LoansandLeasesReceivablePercentageofCreditEnhancementforLoansGreaterthan150000
Namespace Prefix: | banc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=banc_CommercialSmallBusinessAdministrationReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |