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LOANS AND ALLOWANCE FOR LOAN LOSSES - Troubled Debt Restructurings Additional Information (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 USD ($) loan | Jun. 30, 2018 loan | Dec. 31, 2018 USD ($)
Receivables [Abstract] |  |  |
Accruing TDRs | $ 20.2 |  | $ 5.7
Nonaccruing TDRs | $ 2.4 |  | $ 2.3
Number of loans modified that had payments default during the period | loan | 0 | 0 |

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- Definition Financing Receivable, Modifications, Recorded Investment, Accrual Status + References No definition available. + Details
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Namespace Prefix: | banc_
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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 Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration