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SUBSEQUENT EVENTS (Details)	Jul. 25, 2019 USD ($)
Series D and Series E Preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Aggregate purchase price of tender offer	$ 75,000,000

X

- Definition

Sale of Stock, Aggregate Purchase Price

+ References

No definition available.

+ Details

Name:	banc_SaleofStockAggregatePurchasePrice
Namespace Prefix:	banc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=banc_SeriesDandSeriesEPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: