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OFF-BALANCE SHEET COMMITMENTS - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Other Commitments [Line Items]
Commitments to make loans period, maximum	30 days
Commitments to sell loans under residential mortgage division	$ 612.1us-gaap_LoansAndLeasesReceivableCommitmentsToPurchaseOrSell
Jumbo mortgage loan commitments
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division	8.9us-gaap_LoansAndLeasesReceivableCommitmentsToPurchaseOrSell / us-gaap_FinancialInstrumentAxis = banc_JumboMortgageLoanSaleCommitmentsMember
TBAs commitments
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division	572.0us-gaap_LoansAndLeasesReceivableCommitmentsToPurchaseOrSell / us-gaap_FinancialInstrumentAxis = banc_ToBeAnnouncedCommitmentsMember
Best efforts commitments
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division	31.3us-gaap_LoansAndLeasesReceivableCommitmentsToPurchaseOrSell / us-gaap_FinancialInstrumentAxis = banc_BestEffortsCommitmentsMember
Other Commitments
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division	0us-gaap_LoansAndLeasesReceivableCommitmentsToPurchaseOrSell / us-gaap_FinancialInstrumentAxis = banc_OtherCommitmentsMember
Interest rate lock commitments
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division	$ 439.9us-gaap_LoansAndLeasesReceivableCommitmentsToPurchaseOrSell / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember

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

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- Details

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- Details

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X

- Details

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- Details

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