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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Accruing and Non-accrual Troubled Debt Restructurings (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Receivables [Abstract] |  |
Accruing TDRs | $ 5.7 | $ 5.6
Non-accrual TDRs | $ 2.3 | $ 2.7

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- Definition Financing Receivable, Modifications, Recorded Investment, Accrual Status + References No definition available. + Details
Name: | banc_FinancingReceivableModificationsRecordedInvestmentAccrualStatus
Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financing Receivable, Modifications, Recorded Investment, Nonaccrual Status + References No definition available. + Details
Name: | banc_FinancingReceivableModificationsRecordedInvestmentNonaccrualStatus
Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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