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v3.21.1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) | 3 Months Ended
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Mar. 31, 2021 d banking_office
Accounting Policies [Abstract] |
Number of banking offices | banking_office | 29
Exchange ratio | 0.50
Trading period used in the average price calculation | d | 20

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- Definition Merger Agreement, Exchange Ratio + References No definition available. + Details
Name: | banc_MergerAgreementExchangeRatio
Namespace Prefix: | banc_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition Merger Agreement, Trading Period + References No definition available. + Details
Name: | banc_MergerAgreementTradingPeriod
Namespace Prefix: | banc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of offices included in Nature of Operations disclosure. + References No definition available. + Details
Name: | banc_NumberOfBankingOffices
Namespace Prefix: | banc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration