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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Nature of Operations (Detail) | 12 Months Ended
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Dec. 31, 2015 loan_production_office banking_office
Accounting Policies [Abstract] |
Number of banking offices | banking_office | 35
Number of loan production offices | loan_production_office | 68

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

X
- Definition Number of loan production offices included in Nature of Operations disclosure. + References No definition available. + Details
Name: | banc_NumberOfProductionOffices
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