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RELATED-PARTY TRANSACTIONS - Agreement with Oaktree Capital Management (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended		3 Months Ended	12 Months Ended
	Nov. 07, 2014	May 21, 2014	Mar. 31, 2015	Dec. 31, 2014
Greater Than 5% Shareholder, Oaktree
Related Party Transaction [Line Items]
Company ownership percentage	9.90%banc_RelatedPartyTransactionCompanyOwnershipPercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_GreaterThan5ShareholderOaktreeMember
Greater Than 5% Shareholder, Oaktree | Securities Purchase Agreement, Equity Support Payment
Related Party Transaction [Line Items]
Expenses from transactions with related parties	$ 1,600us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = banc_SecuritiesPurchaseAgreementEquitySupportPaymentMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_GreaterThan5ShareholderOaktreeMember
Common Stock
Related Party Transaction [Line Items]
Issuance of stock shares		5,150,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Common Stock | Greater Than 5% Shareholder, Oaktree
Related Party Transaction [Line Items]
Common stock, shares outstanding			3,288,947us-gaap_CommonStockSharesOutstanding / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_GreaterThan5ShareholderOaktreeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Issuance of stock shares	3,288,947us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_GreaterThan5ShareholderOaktreeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Price per share issuable	$ 9.78banc_RelatedPartyTransactionSecuritiesPurchaseAgreementPricePerShareIssuable / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_GreaterThan5ShareholderOaktreeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
The Palisades Group Llc | Greater Than 5% Shareholder, Oaktree
Related Party Transaction [Line Items]
Revenue from related parties			$ 984us-gaap_RevenueFromRelatedParties / dei_LegalEntityAxis = banc_ThePalisadesGroupLlcMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_GreaterThan5ShareholderOaktreeMember	$ 5,300us-gaap_RevenueFromRelatedParties / dei_LegalEntityAxis = banc_ThePalisadesGroupLlcMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_GreaterThan5ShareholderOaktreeMember

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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