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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Contractual Amount of Financial Instruments with Off-Balance-Sheet Risk (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Commitments to extend credit
Other Commitments [Line Items]
Fixed Rate	$ 59,085	$ 40,312
Variable Rate	127,837	99,026
Unused lines of credit
Other Commitments [Line Items]
Fixed Rate	3,164	6,044
Variable Rate	579,175	508,295
Letters of credit
Other Commitments [Line Items]
Fixed Rate	760	2,611
Variable Rate	$ 14,213	$ 11,278

X

- Definition

Other Commitments, Off-Balance Sheet Risk, Fixed Rate Financial Instrument

+ References

No definition available.

+ Details

Name:	banc_OtherCommitmentsOffBalanceSheetRiskFixedRateFinancialInstrument
Namespace Prefix:	banc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Other Commitments, Off-Balance Sheet Risk, Variable Rate Financial Instrument

+ References

No definition available.

+ Details

Name:	banc_OtherCommitmentsOffBalanceSheetRiskVariableRateFinancialInstrument
Namespace Prefix:	banc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_UnusedLinesOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: