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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgages Portfolio (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended	0 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2015 Loan	Dec. 31, 2014 Loan	Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	3,933,715us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	3,949,122us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	$ 3,933,715us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	$ 3,949,122us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	$ 2,396,995us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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
Non-Traditional Mortgages (NTM)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count	402us-gaap_MortgageLoansOnRealEstateNumberOfLoans / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember	407us-gaap_MortgageLoansOnRealEstateNumberOfLoans / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember
Amount	353,825us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember	350,575us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember	353,825us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember	350,575us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember
Non-Traditional Mortgages (NTM) | Nontraditional Mortgage Loans 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_NontraditionalMortgageLoansPortfolioMember / us-gaap_ConcentrationRiskByTypeAxis = banc_LoanPortfolioConcentrationRiskMember / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember	100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = banc_NontraditionalMortgageLoansPortfolioMember / us-gaap_ConcentrationRiskByTypeAxis = banc_LoanPortfolioConcentrationRiskMember / 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
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	124,700us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember	128,200us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember	124,700us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember	128,200us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember
Non-Traditional Mortgages (NTM) | Interest Only Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	216,900us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember	209,300us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember	216,900us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember	209,300us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember
Non-Traditional Mortgages (NTM) | Negative amortization
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	12,200us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_ProductOrServiceAxis = banc_NegativeAmortizationLoansMember	13,100us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_ProductOrServiceAxis = banc_NegativeAmortizationLoansMember	12,200us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_ProductOrServiceAxis = banc_NegativeAmortizationLoansMember	13,100us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_ProductOrServiceAxis = banc_NegativeAmortizationLoansMember
Non-Traditional Mortgages (NTM) | First lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count	382us-gaap_MortgageLoansOnRealEstateNumberOfLoans / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember	387us-gaap_MortgageLoansOnRealEstateNumberOfLoans / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember
Amount	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	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) | First lien | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	98.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = banc_NontraditionalMortgageLoansPortfolioMember / us-gaap_ConcentrationRiskByTypeAxis = banc_LoanPortfolioConcentrationRiskMember / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember	98.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = banc_NontraditionalMortgageLoansPortfolioMember / us-gaap_ConcentrationRiskByTypeAxis = banc_LoanPortfolioConcentrationRiskMember / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember
Non-Traditional Mortgages (NTM) | First lien | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count	147us-gaap_MortgageLoansOnRealEstateNumberOfLoans / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember	148us-gaap_MortgageLoansOnRealEstateNumberOfLoans / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember	147us-gaap_MortgageLoansOnRealEstateNumberOfLoans / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember	148us-gaap_MortgageLoansOnRealEstateNumberOfLoans / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember
Amount	119,958us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember	123,177us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember	119,958us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember	123,177us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember
Non-Traditional Mortgages (NTM) | First lien | Green Loans | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	33.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = banc_NontraditionalMortgageLoansPortfolioMember / us-gaap_ConcentrationRiskByTypeAxis = banc_LoanPortfolioConcentrationRiskMember / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember	35.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = banc_NontraditionalMortgageLoansPortfolioMember / us-gaap_ConcentrationRiskByTypeAxis = banc_LoanPortfolioConcentrationRiskMember / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember
Non-Traditional Mortgages (NTM) | First lien | Interest Only Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count	204us-gaap_MortgageLoansOnRealEstateNumberOfLoans / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember	207us-gaap_MortgageLoansOnRealEstateNumberOfLoans / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember
Amount	216,765us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember	209,207us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember	216,765us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember	209,207us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember
Non-Traditional Mortgages (NTM) | First lien | Interest Only Loans | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	61.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = banc_NontraditionalMortgageLoansPortfolioMember / us-gaap_ConcentrationRiskByTypeAxis = banc_LoanPortfolioConcentrationRiskMember / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember	59.70%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = banc_NontraditionalMortgageLoansPortfolioMember / us-gaap_ConcentrationRiskByTypeAxis = banc_LoanPortfolioConcentrationRiskMember / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember
Non-Traditional Mortgages (NTM) | First lien | Negative amortization
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count	31us-gaap_MortgageLoansOnRealEstateNumberOfLoans / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_NegativeAmortizationLoansMember	32us-gaap_MortgageLoansOnRealEstateNumberOfLoans / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_NegativeAmortizationLoansMember
Amount	12,241us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_NegativeAmortizationLoansMember	13,099us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_NegativeAmortizationLoansMember	12,241us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_NegativeAmortizationLoansMember	13,099us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_NegativeAmortizationLoansMember
Non-Traditional Mortgages (NTM) | First lien | Negative amortization | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	3.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = banc_NontraditionalMortgageLoansPortfolioMember / us-gaap_ConcentrationRiskByTypeAxis = banc_LoanPortfolioConcentrationRiskMember / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_NegativeAmortizationLoansMember	3.70%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = banc_NontraditionalMortgageLoansPortfolioMember / us-gaap_ConcentrationRiskByTypeAxis = banc_LoanPortfolioConcentrationRiskMember / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_FirstMortgageMember / us-gaap_ProductOrServiceAxis = banc_NegativeAmortizationLoansMember
Non-Traditional Mortgages (NTM) | Second lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count	20us-gaap_MortgageLoansOnRealEstateNumberOfLoans / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember	20us-gaap_MortgageLoansOnRealEstateNumberOfLoans / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember
Amount	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	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) | Second lien | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	1.40%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = banc_NontraditionalMortgageLoansPortfolioMember / us-gaap_ConcentrationRiskByTypeAxis = banc_LoanPortfolioConcentrationRiskMember / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember	1.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = banc_NontraditionalMortgageLoansPortfolioMember / us-gaap_ConcentrationRiskByTypeAxis = banc_LoanPortfolioConcentrationRiskMember / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember
Non-Traditional Mortgages (NTM) | Second lien | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count	19us-gaap_MortgageLoansOnRealEstateNumberOfLoans / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember	19us-gaap_MortgageLoansOnRealEstateNumberOfLoans / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember
Amount	4,748us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember	4,979us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember	4,748us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember	4,979us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember
Non-Traditional Mortgages (NTM) | Second lien | Green Loans | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	1.30%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = banc_NontraditionalMortgageLoansPortfolioMember / us-gaap_ConcentrationRiskByTypeAxis = banc_LoanPortfolioConcentrationRiskMember / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember	1.40%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = banc_NontraditionalMortgageLoansPortfolioMember / us-gaap_ConcentrationRiskByTypeAxis = banc_LoanPortfolioConcentrationRiskMember / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember
Non-Traditional Mortgages (NTM) | Second lien | Interest Only Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count	1us-gaap_MortgageLoansOnRealEstateNumberOfLoans / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember	1us-gaap_MortgageLoansOnRealEstateNumberOfLoans / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember
Amount	113us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember	113us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember	$ 113us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember	$ 113us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember
Non-Traditional Mortgages (NTM) | Second lien | Interest Only Loans | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	0.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = banc_NontraditionalMortgageLoansPortfolioMember / us-gaap_ConcentrationRiskByTypeAxis = banc_LoanPortfolioConcentrationRiskMember / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember	0.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = banc_NontraditionalMortgageLoansPortfolioMember / us-gaap_ConcentrationRiskByTypeAxis = banc_LoanPortfolioConcentrationRiskMember / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = us-gaap_SecondMortgageMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

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- Definition

Indicates the number of mortgages under each classification.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-29.3)

-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule IV

-Article 5



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Paragraph 3

-Article 12

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