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RELATED-PARTY TRANSACTIONS - Transaction with TWC Shared Opportunity Fund V, L.P., a Greater than 5 percent Shareholder (Details) (Tcw Shared Opportunity Fund)	0 Months Ended	1 Months Ended	0 Months Ended
	Nov. 01, 2010	Nov. 30, 2010	Mar. 16, 2015	Jan. 20, 2015	Jan. 05, 2015	Jun. 03, 2013	Dec. 10, 2014	Mar. 31, 2015	May 29, 2013
Related Party Transaction [Line Items]
Warrant exercisable period	5 years	5 years
Warrants issued	240,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights	240,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Conversion ratio							1banc_ConversionofStockConversionRatio
Voting Common Stock
Related Party Transaction [Line Items]
Maximum ownership percentage by noncontrolling owners to not be considered a bank holding company		4.99%banc_NoncontrollingInterestMaximumOwnershipPercentagebyNoncontrollingOwnersToNotBeConsideredaBankholdingCompany / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_Greaterthan5ShareholderTCWShareholderMember / us-gaap_StatementClassOfStockAxis = banc_VotingCommonStockMember
Maximum ownership percentage									9.99%banc_NoncontrollingInterestMaximumOwnershipPercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_Greaterthan5ShareholderTCWShareholderMember / us-gaap_StatementClassOfStockAxis = banc_VotingCommonStockMember
Shares exchanged			934banc_StockIssuedDuringPeriodSharesExchanged / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_Greaterthan5ShareholderTCWShareholderMember / us-gaap_StatementClassOfStockAxis = banc_VotingCommonStockMember	86,620banc_StockIssuedDuringPeriodSharesExchanged / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_Greaterthan5ShareholderTCWShareholderMember / us-gaap_StatementClassOfStockAxis = banc_VotingCommonStockMember	522,564banc_StockIssuedDuringPeriodSharesExchanged / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_Greaterthan5ShareholderTCWShareholderMember / us-gaap_StatementClassOfStockAxis = banc_VotingCommonStockMember	550,000banc_StockIssuedDuringPeriodSharesExchanged / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_Greaterthan5ShareholderTCWShareholderMember / us-gaap_StatementClassOfStockAxis = banc_VotingCommonStockMember
Stock outstanding								1,688,580us-gaap_CommonStockOtherSharesOutstanding / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_Greaterthan5ShareholderTCWShareholderMember / us-gaap_StatementClassOfStockAxis = banc_VotingCommonStockMember
Nonvoting Common Stock
Related Party Transaction [Line Items]
Warrants issued								240,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_Greaterthan5ShareholderTCWShareholderMember / us-gaap_StatementClassOfStockAxis = us-gaap_NonvotingCommonStockMember
Stock outstanding								0us-gaap_CommonStockOtherSharesOutstanding / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_Greaterthan5ShareholderTCWShareholderMember / us-gaap_StatementClassOfStockAxis = us-gaap_NonvotingCommonStockMember

X

- Definition

Class of Warrant or Right, Exercisable Period

+ References

No definition available.

+ Details

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- Definition

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+ References

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- Definition

Noncontrolling Interest, Maximum Ownership Percentage

+ References

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- Definition

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+ References

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- Definition

Stock Issued During Period, Shares, Exchanged

+ References

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- 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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- Definition

Total number of shares of other common stock instruments held by shareholders, such as exchangeable shares. May be all or portion of the number of common shares authorized.

+ References

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