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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	Sep. 30, 2014	Dec. 31, 2013
Commitments to extend credit
Other Commitments [Line Items]
Fixed Rate	$ 59,892	$ 35,425
Variable Rate	46,534	61,613
Unused lines of credit
Other Commitments [Line Items]
Fixed Rate	18,633	3,403
Variable Rate	272,510	268,669
Letters of credit
Other Commitments [Line Items]
Fixed Rate	760	10
Variable Rate	$ 7,569	$ 6,289

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

- Details

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