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STOCKHOLDERS' EQUITY - Perpetual Preferred Stock (Details) (Subsequent Event, Series D Preferred Stock)	0 Months Ended
	Apr. 08, 2015
Subsequent Event | Series D Preferred Stock
Class of Stock [Line Items]
Depository shares to preferred stock ratio	2.50%banc_DepositorySharesToPreferredStockRatio / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition

Depository Shares to Preferred Stock Ratio

+ References

No definition available.

+ Details

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Namespace Prefix:	banc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Details

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