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OFF-BALANCE SHEET COMMITMENTS - Contractual Amount of Financial Instruments with Off-Balance-Sheet Risk (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Commitments to extend credit
Other Commitments [Line Items]
Fixed Rate	$ 126,760banc_OtherCommitmentsOffBalanceSheetRiskFixedRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember	$ 87,517banc_OtherCommitmentsOffBalanceSheetRiskFixedRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember
Variable Rate	94,011banc_OtherCommitmentsOffBalanceSheetRiskVariableRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember	82,818banc_OtherCommitmentsOffBalanceSheetRiskVariableRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember
Unused lines of credit
Other Commitments [Line Items]
Fixed Rate	35,865banc_OtherCommitmentsOffBalanceSheetRiskFixedRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember	20,631banc_OtherCommitmentsOffBalanceSheetRiskFixedRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember
Variable Rate	310,839banc_OtherCommitmentsOffBalanceSheetRiskVariableRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember	295,626banc_OtherCommitmentsOffBalanceSheetRiskVariableRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember
Letters of credit
Other Commitments [Line Items]
Fixed Rate	810banc_OtherCommitmentsOffBalanceSheetRiskFixedRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember	825banc_OtherCommitmentsOffBalanceSheetRiskFixedRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember
Variable Rate	$ 11,140banc_OtherCommitmentsOffBalanceSheetRiskVariableRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember	$ 10,411banc_OtherCommitmentsOffBalanceSheetRiskVariableRateFinancialInstrument / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember

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- 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

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- 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

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- 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_StandbyLettersOfCreditMember
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: