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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
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 $ 20,040,480banc_RelatedPartyTransactionSecuritiesPurchaseAgreementAggregatePurchasePrice
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_GreaterThan5ShareholderPatriotMember
     
Equity support payment 538,000banc_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 $ 100,000us-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   3,100,564us-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 1,076,000banc_RelatedPartyTransactionSecuritiesPurchaseAgreementCommonStockIssuable
/ us-gaap_RelatedPartyTransactionAxis
= banc_VotingCommonStockOptionOneMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_GreaterThan5ShareholderPatriotMember
/ us-gaap_StatementClassOfStockAxis
= banc_VotingCommonStockMember
     
Price per share issuable $ 9.78banc_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 824,000banc_RelatedPartyTransactionSecuritiesPurchaseAgreementCommonStockIssuable
/ us-gaap_RelatedPartyTransactionAxis
= banc_VotingCommonStockOptionTwoMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_GreaterThan5ShareholderPatriotMember
/ us-gaap_StatementClassOfStockAxis
= banc_VotingCommonStockMember
     
Price per share issuable $ 11.55banc_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     20banc_BusinessCombinationNumberofBranches
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
 
Banco Popular Branches | Greater Than 5% Shareholder, Patriot [Member]        
Related Party Transaction [Line Items]        
Number of branches       20banc_BusinessCombinationNumberofBranches
/ us-gaap_BusinessAcquisitionAxis
= banc_BancoPopularNorthAmericaMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= banc_GreaterThan5ShareholderPatriotMember