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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 |  |  |
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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 | 240,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights | 240,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  |  | 1 banc_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 |  |  | 934 banc_StockIssuedDuringPeriodSharesExchanged / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_Greaterthan5ShareholderTCWShareholderMember / us-gaap_StatementClassOfStockAxis = banc_VotingCommonStockMember | 86,620 banc_StockIssuedDuringPeriodSharesExchanged / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_Greaterthan5ShareholderTCWShareholderMember / us-gaap_StatementClassOfStockAxis = banc_VotingCommonStockMember | 522,564 banc_StockIssuedDuringPeriodSharesExchanged / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_Greaterthan5ShareholderTCWShareholderMember / us-gaap_StatementClassOfStockAxis = banc_VotingCommonStockMember | 550,000 banc_StockIssuedDuringPeriodSharesExchanged / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_Greaterthan5ShareholderTCWShareholderMember / us-gaap_StatementClassOfStockAxis = banc_VotingCommonStockMember |  |  |
Stock outstanding |  |  |  |  |  |  |  | 1,688,580 us-gaap_CommonStockOtherSharesOutstanding / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_Greaterthan5ShareholderTCWShareholderMember / us-gaap_StatementClassOfStockAxis = banc_VotingCommonStockMember |
Nonvoting Common Stock |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Warrants issued |  |  |  |  |  |  |  | 240,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_Greaterthan5ShareholderTCWShareholderMember / us-gaap_StatementClassOfStockAxis = us-gaap_NonvotingCommonStockMember |
Stock outstanding |  |  |  |  |  |  |  | 0 us-gaap_CommonStockOtherSharesOutstanding / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_Greaterthan5ShareholderTCWShareholderMember / us-gaap_StatementClassOfStockAxis = us-gaap_NonvotingCommonStockMember |

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- Definition Conversion of Stock, Conversion Ratio + References No definition available. + Details
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- Definition Noncontrolling Interest, Maximum Ownership Percentage + References No definition available. + Details
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- Definition Noncontrolling Interest, Maximum Ownership Percentage by Noncontrolling Owners To Not Be Considered a Bank holding Company + References No definition available. + Details
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- Definition Stock Issued During Period, Shares, Exchanged + References No definition available. + Details
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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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- Details
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