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LOANS AND ALLOWANCE FOR LOAN LOSSES - Accruing and Non-accrual Troubled Debt Restructurings (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
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Receivables [Abstract] |  |
Commitments to lend to clients with outstanding loans classified as TDRs | $ 135,000 | $ 0
Accruing TDRs | 6,600,000 | 5,700,000
Non-accrual TDRs | $ 15,200,000 | $ 2,300,000

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- Definition Financing Receivable, Modifications, Recorded Investment, Accrual Status + References No definition available. + Details
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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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- Definition Amount of unfunded portion of contractual agreement to lend funds to borrower for financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18794-111554 + Details
Name: | us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend
Namespace Prefix: | us-gaap_
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