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OFF-BALANCE SHEET COMMITMENTS - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014
Other Commitments [Line Items]
Commitments to make loans period, maximum	30 days
Commitments to sell loans under residential mortgage division	$ 461,200,000
Jumbo mortgage loan commitments
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division	112,700,000
TBAs commitments
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division	307,000,000
Best efforts commitments
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division	41,500,000
Other Commitments
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division	0
Interest rate lock commitments
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division	$ 200,400,000

X

- Definition

Other Commitments, Origination of Loans, Period

+ References

No definition available.

+ Details

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

X

- Definition

Reflects the carrying amount of loans and leases for which agreements to acquire or dispose exist.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 825

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6480020&loc=d3e61082-112788



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 825

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6480020&loc=d3e61044-112788

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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