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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Nature of Operations (Detail)	12 Months Ended
	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

X

- Definition

Number of offices included in Nature of Operations disclosure.

+ References

No definition available.

+ Details

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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

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration