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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Schedule of Loans and Leases Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 3,933,715us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 3,949,122us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 2,396,995us-gaap_LoansAndLeasesReceivableGrossCarryingAmount  
Allowance for loan and lease losses (29,345)us-gaap_LoansAndLeasesReceivableAllowance (29,480)us-gaap_LoansAndLeasesReceivableAllowance (20,003)us-gaap_LoansAndLeasesReceivableAllowance (18,805)us-gaap_LoansAndLeasesReceivableAllowance
Loans and leases receivable, net 3,904,370us-gaap_LoansAndLeasesReceivableNetReportedAmount 3,919,642us-gaap_LoansAndLeasesReceivableNetReportedAmount    
Loan Portfolio | Loan Portfolio Concentration Risk        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Concentration risk percentage 100.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_LoanPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember		 100.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_LoanPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember		    
Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 489,229us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialandIndustrialReceivableMember		 490,900us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialandIndustrialReceivableMember		 299,184us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialandIndustrialReceivableMember		  
Allowance for loan and lease losses (6,484)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialandIndustrialReceivableMember		 (6,910)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialandIndustrialReceivableMember		 (2,367)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialandIndustrialReceivableMember		 (1,822)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialandIndustrialReceivableMember
Commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 975,734us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 999,857us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 560,581us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		  
Allowance for loan and lease losses (3,904)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 (3,840)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 (6,449)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 (5,484)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
Multi-family        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 940,053us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialMultiFamilyReceivableMember		 955,683us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialMultiFamilyReceivableMember		 155,382us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialMultiFamilyReceivableMember		  
Allowance for loan and lease losses (7,164)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialMultiFamilyReceivableMember		 (7,179)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialMultiFamilyReceivableMember		 (2,720)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialMultiFamilyReceivableMember		 (2,566)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialMultiFamilyReceivableMember
SBA        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 48,254us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialSmallBusinessAdministrationReceivableMember		 36,155us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialSmallBusinessAdministrationReceivableMember		 26,541us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialSmallBusinessAdministrationReceivableMember		  
Allowance for loan and lease losses (566)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialSmallBusinessAdministrationReceivableMember		 (335)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialSmallBusinessAdministrationReceivableMember		 (211)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialSmallBusinessAdministrationReceivableMember		 (235)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialSmallBusinessAdministrationReceivableMember
Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 38,081us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 42,198us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 25,144us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		  
Allowance for loan and lease losses (695)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 (846)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 (352)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 (244)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 102,012us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialLeaseFinancingReceivableMember		 85,749us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialLeaseFinancingReceivableMember		 48,537us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialLeaseFinancingReceivableMember		  
Allowance for loan and lease losses (1,195)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialLeaseFinancingReceivableMember		 (873)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialLeaseFinancingReceivableMember		 (622)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialLeaseFinancingReceivableMember		 (428)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialLeaseFinancingReceivableMember
Single family residential mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 1,049,176us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerSingleFamilyResidentialMortgageReceivableMember		 1,048,485us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerSingleFamilyResidentialMortgageReceivableMember		    
Consumer Home Equity Loan | Green Loans (HELOC) - first liens        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 119,958us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		 123,177us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		    
Consumer Home Equity Loan | Green Loans (HELOC) - second liens        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 4,748us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember		 4,979us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember		    
Other consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 166,470us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember		 161,939us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember		    
Purchased Credit Impaired        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 241,798us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		 246,897us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		    
Purchased Credit Impaired | Loan Portfolio | Loan Portfolio Concentration Risk        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Concentration risk percentage 6.10%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_LoanPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		 6.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_LoanPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		    
Purchased Credit Impaired | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 1,079us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialandIndustrialReceivableMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		 1,134us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialandIndustrialReceivableMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		    
Purchased Credit Impaired | Commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 10,432us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		 11,527us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		    
Purchased Credit Impaired | Multi-family        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialMultiFamilyReceivableMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialMultiFamilyReceivableMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		    
Purchased Credit Impaired | SBA        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 3,136us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialSmallBusinessAdministrationReceivableMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		 3,157us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialSmallBusinessAdministrationReceivableMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		    
Purchased Credit Impaired | Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		    
Purchased Credit Impaired | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialLeaseFinancingReceivableMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialLeaseFinancingReceivableMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		    
Purchased Credit Impaired | Single family residential mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 227,151us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerSingleFamilyResidentialMortgageReceivableMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		 231,079us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerSingleFamilyResidentialMortgageReceivableMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		    
Purchased Credit Impaired | Consumer Home Equity Loan | Green Loans (HELOC) - first liens        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		    
Purchased Credit Impaired | Consumer Home Equity Loan | Green Loans (HELOC) - second liens        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		    
Purchased Credit Impaired | Other consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
/ banc_ReceivablesAcquiredwithDeterioratedCreditQualityAxis
= banc_ReceivablesAcquiredwithDeterioratedCreditQualityMember		    
Non-Traditional Mortgages (NTM)        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 353,825us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember		 350,575us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember		    
Non-Traditional Mortgages (NTM) | Loan Portfolio | Loan Portfolio Concentration Risk        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Concentration risk percentage 9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_LoanPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember		 8.90%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_LoanPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember		    
Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 348,964us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		 345,483us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		    
Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - second liens        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 4,861us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember		 5,092us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember		    
Non-Traditional Mortgages (NTM) | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialandIndustrialReceivableMember		 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialandIndustrialReceivableMember		    
Non-Traditional Mortgages (NTM) | Commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		    
Non-Traditional Mortgages (NTM) | Multi-family        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialMultiFamilyReceivableMember		 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialMultiFamilyReceivableMember		    
Non-Traditional Mortgages (NTM) | SBA        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialSmallBusinessAdministrationReceivableMember		 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialSmallBusinessAdministrationReceivableMember		    
Non-Traditional Mortgages (NTM) | Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		    
Non-Traditional Mortgages (NTM) | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialLeaseFinancingReceivableMember		 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialLeaseFinancingReceivableMember		    
Non-Traditional Mortgages (NTM) | Single family residential mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 229,006us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerSingleFamilyResidentialMortgageReceivableMember		 222,306us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerSingleFamilyResidentialMortgageReceivableMember		    
Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - first liens        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 119,958us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		 123,177us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		    
Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - second liens        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 4,748us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember		 4,979us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember		    
Non-Traditional Mortgages (NTM) | Other consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 113us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember		 113us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember		    
Traditional Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 3,338,092us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember		 3,351,650us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember		    
Traditional Loans | Loan Portfolio | Loan Portfolio Concentration Risk        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Concentration risk percentage 84.90%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_LoanPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember		 84.80%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_LoanPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember		    
Traditional Loans | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 488,150us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialandIndustrialReceivableMember		 489,766us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialandIndustrialReceivableMember		    
Traditional Loans | Commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 965,302us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 988,330us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		    
Traditional Loans | Multi-family        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 940,053us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialMultiFamilyReceivableMember		 955,683us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialMultiFamilyReceivableMember		    
Traditional Loans | SBA        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 45,118us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialSmallBusinessAdministrationReceivableMember		 32,998us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialSmallBusinessAdministrationReceivableMember		    
Traditional Loans | Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 38,081us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 42,198us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		    
Traditional Loans | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 102,012us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialLeaseFinancingReceivableMember		 85,749us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialLeaseFinancingReceivableMember		    
Traditional Loans | Single family residential mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 593,019us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerSingleFamilyResidentialMortgageReceivableMember		 595,100us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerSingleFamilyResidentialMortgageReceivableMember		    
Traditional Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		    
Traditional Loans | Consumer Home Equity Loan | Green Loans (HELOC) - second liens        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember		 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember		    
Traditional Loans | Other consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 166,357us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember		 161,826us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember		    
Total NTM and Traditional Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 3,691,917us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember		 3,702,225us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember		    
Total NTM and Traditional Loans | Loan Portfolio | Loan Portfolio Concentration Risk        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Concentration risk percentage 93.90%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_LoanPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember		 93.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_LoanPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember		    
Total NTM and Traditional Loans | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 488,150us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialandIndustrialReceivableMember		 489,766us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialandIndustrialReceivableMember		    
Total NTM and Traditional Loans | Commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 965,302us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 988,330us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		    
Total NTM and Traditional Loans | Multi-family        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 940,053us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialMultiFamilyReceivableMember		 955,683us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialMultiFamilyReceivableMember		    
Total NTM and Traditional Loans | SBA        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 45,118us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialSmallBusinessAdministrationReceivableMember		 32,998us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialSmallBusinessAdministrationReceivableMember		    
Total NTM and Traditional Loans | Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 38,081us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 42,198us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		    
Total NTM and Traditional Loans | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 102,012us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialLeaseFinancingReceivableMember		 85,749us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialLeaseFinancingReceivableMember		    
Total NTM and Traditional Loans | Single family residential mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 822,025us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerSingleFamilyResidentialMortgageReceivableMember		 817,406us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerSingleFamilyResidentialMortgageReceivableMember		    
Total NTM and Traditional Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 119,958us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		 123,177us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		    
Total NTM and Traditional Loans | Consumer Home Equity Loan | Green Loans (HELOC) - second liens        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 4,748us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember		 4,979us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember		    
Total NTM and Traditional Loans | Other consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 166,470us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesAndTraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember		 161,939us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
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