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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 | $ 1,600 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = banc_SecuritiesPurchaseAgreementEquitySupportPaymentMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_GreaterThan5ShareholderOaktreeMember |  |  |
Common Stock |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Issuance of stock shares |  | 5,150,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Common Stock | Greater Than 5% Shareholder, Oaktree |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Common stock, shares outstanding |  |  | 3,288,947 us-gaap_CommonStockSharesOutstanding / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_GreaterThan5ShareholderOaktreeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
Issuance of stock shares | 3,288,947 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_GreaterThan5ShareholderOaktreeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Price per share issuable | $ 9.78 banc_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 |  |  | $ 984 us-gaap_RevenueFromRelatedParties / dei_LegalEntityAxis = banc_ThePalisadesGroupLlcMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_GreaterThan5ShareholderOaktreeMember | $ 5,300 us-gaap_RevenueFromRelatedParties / dei_LegalEntityAxis = banc_ThePalisadesGroupLlcMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_GreaterThan5ShareholderOaktreeMember

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