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SHAREHOLDERS' EQUITY - Warrants (Details) (USD $)	0 Months Ended	1 Months Ended
	Nov. 01, 2010	Nov. 30, 2010	Nov. 01, 2010
Tcw Shared Opportunity Fund
Class of Stock [Line Items]
Warrants issued		240,000	240,000
Exercise price of warrants for non-voting common stock			$ 11.00
Warrant exercisable period	5 years	5 years
Cor Advisors Llc
Class of Stock [Line Items]
Warrants issued	1,395,000		1,395,000
Exercise price of warrants for non-voting common stock	$ 11.00		$ 11.00
Cor Advisors Llc | President And Chief Executive Officer
Class of Stock [Line Items]
Warrants issued	960,000		960,000
Cor Advisors Llc | Vice President and Chief Lending Officer
Class of Stock [Line Items]
Warrants issued	435,000		435,000

X

- Definition

Class of Warrant or Right, Exercisable Period

+ References

No definition available.

+ Details

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Namespace Prefix:	banc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i)(4))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i)(2))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Subparagraph 2

-Article 4

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant