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STOCKHOLDERS' EQUITY - Common Stock (Details) (Common Stock, USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended
Nov. 07, 2014
May 21, 2014
Class of Stock [Line Items]    
Issuance of stock shares   5,150,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
Underwriters option period   30 days
Net proceeds from issuance of common stock $ 49.9us-gaap_ProceedsFromIssuanceOfCommonStock $ 50.4us-gaap_ProceedsFromIssuanceOfCommonStock
Over Allotment Option    
Class of Stock [Line Items]    
Issuance of stock shares   772,500us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_OverAllotmentOptionMember
Underwriters option period   30 days
Net proceeds from issuance of common stock   $ 7.6us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_OverAllotmentOptionMember
OCM BOCA Investor, LLC (Oaktree)    
Class of Stock [Line Items]    
Issuance of stock shares 3,288,947us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_CounterpartyNameAxis
= banc_OCMBOCAInvestorLLCOaktreeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Patriot Financial Partners, L.P.    
Class of Stock [Line Items]    
Issuance of stock shares 1,900,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_CounterpartyNameAxis
= banc_PatriotFinancialPartnersL.P.Member
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember