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RELATED-PARTY TRANSACTIONS - Securities Purchase Agreement with Patriot Financial Partners, L.P. and Patriot Financial Partners Parallel, L.P. (Details) (USD $) | 0 Months Ended |  |  |
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Oct. 30, 2014 | Nov. 10, 2014 | Nov. 08, 2014 Branch | Apr. 22, 2014 Branch
Greater Than 5% Shareholder, Patriot [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Aggregate purchase price | $ 20,040,480 banc_RelatedPartyTransactionSecuritiesPurchaseAgreementAggregatePurchasePrice / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_GreaterThan5ShareholderPatriotMember |  |  |
Equity support payment | 538,000 banc_RelatedPartyTransactionSecuritiesPurchaseAgreementEquitySupportPayment / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_GreaterThan5ShareholderPatriotMember |  |  |
Greater Than 5% Shareholder, Patriot [Member] | Securities Purchase Agreement, Reimbursement of Out-of-Pocket Expenses |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related parties | $ 100,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = banc_SecuritiesPurchaseAgreementReimbursementofOutofPocketExpensesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_GreaterThan5ShareholderPatriotMember |  |  |
Voting Common Stock | Greater Than 5% Shareholder, Patriot [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Common stock, shares outstanding |  | 3,100,564 us-gaap_CommonStockSharesOutstanding / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_GreaterThan5ShareholderPatriotMember / us-gaap_StatementClassOfStockAxis = banc_VotingCommonStockMember |  |
Voting Common Stock | Greater Than 5% Shareholder, Patriot [Member] | Voting Common Stock Option One |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Common stock issuable | 1,076,000 banc_RelatedPartyTransactionSecuritiesPurchaseAgreementCommonStockIssuable / us-gaap_RelatedPartyTransactionAxis = banc_VotingCommonStockOptionOneMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_GreaterThan5ShareholderPatriotMember / us-gaap_StatementClassOfStockAxis = banc_VotingCommonStockMember |  |  |
Price per share issuable | $ 9.78 banc_RelatedPartyTransactionSecuritiesPurchaseAgreementPricePerShareIssuable / us-gaap_RelatedPartyTransactionAxis = banc_VotingCommonStockOptionOneMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_GreaterThan5ShareholderPatriotMember / us-gaap_StatementClassOfStockAxis = banc_VotingCommonStockMember |  |  |
Voting Common Stock | Greater Than 5% Shareholder, Patriot [Member] | Voting Common Stock Option Two |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Common stock issuable | 824,000 banc_RelatedPartyTransactionSecuritiesPurchaseAgreementCommonStockIssuable / us-gaap_RelatedPartyTransactionAxis = banc_VotingCommonStockOptionTwoMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_GreaterThan5ShareholderPatriotMember / us-gaap_StatementClassOfStockAxis = banc_VotingCommonStockMember |  |  |
Price per share issuable | $ 11.55 banc_RelatedPartyTransactionSecuritiesPurchaseAgreementPricePerShareIssuable / us-gaap_RelatedPartyTransactionAxis = banc_VotingCommonStockOptionTwoMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_GreaterThan5ShareholderPatriotMember / us-gaap_StatementClassOfStockAxis = banc_VotingCommonStockMember |  |  |
Banco Popular Branches |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Number of branches |  |  | 20 banc_BusinessCombinationNumberofBranches / us-gaap_BusinessAcquisitionAxis = banc_BancoPopularNorthAmericaMember |
Banco Popular Branches | Greater Than 5% Shareholder, Patriot [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Number of branches |  |  |  | 20 banc_BusinessCombinationNumberofBranches / us-gaap_BusinessAcquisitionAxis = banc_BancoPopularNorthAmericaMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banc_GreaterThan5ShareholderPatriotMember

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