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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Additional Information (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Loan
Mar. 31, 2014
Loan
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 3,933,715,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 2,396,995,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 3,949,122,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Number of Loans 2us-gaap_FinancingReceivableModificationsNumberOfContracts2 0us-gaap_FinancingReceivableModificationsNumberOfContracts2  
Loans delinquent 60 days    
Unpaid principal balances of PCI loans sold   27,700,000banc_CertainLoansAcquiredinTransferNotAccountedforasDebtSecuritiesUnpaidPrincipalBalanceSold  
Carrying value of loans sold   16,100,000banc_CertainLoansAcquiredinTransferNotAccountedforasDebtSecuritiesCarryingAmountSold  
Gain (loss) on PCI loans sold   2,300,000banc_CertainLoansAcquiredinTransferNotAccountedforasDebtSecuritiesGainLossonLoansSold  
Unfunded Loan Commitment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unfunded loan commitments 1,900,000us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_UnfundedLoanCommitmentMember
  1,900,000us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_UnfundedLoanCommitmentMember
Loan Portfolio Concentration Risk | Loan Portfolio      
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]      
Gross loans 353,825,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
  350,575,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
Increase (decrease) in loans receivable 3,300,000banc_LoansandLeasesReceivableGrossIncreaseDecreaseinPeriod
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
   
Increase (decrease) in loans receivable, percentage 0.90%banc_LoansandLeasesReceivableGrossPercentageIncreaseDecreaseinPeriod
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
   
Non-Traditional Mortgages (NTM) | Green Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 124,700,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
  128,200,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
Interest only notes balloon payment period 15 years    
Non-Traditional Mortgages (NTM) | Interest Only Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 216,900,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_ProductOrServiceAxis
= banc_InterestOnlyLoansMember
  209,300,000us-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]      
Gross loans 12,200,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_ProductOrServiceAxis
= banc_NegativeAmortizationLoansMember
  13,100,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_ProductOrServiceAxis
= banc_NegativeAmortizationLoansMember
Non-Traditional Mortgages (NTM) | Loan Portfolio Concentration Risk | Loan Portfolio      
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
Nonperforming Financing Receivable | Non-Traditional Mortgages (NTM) | Green Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 10,700,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancialInstrumentPerformanceStatusAxis
= banc_NonperformingFinancialInstrumentsMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
  12,500,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancialInstrumentPerformanceStatusAxis
= banc_NonperformingFinancialInstrumentsMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
Nonperforming Financing Receivable | Non-Traditional Mortgages (NTM) | Interest Only Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancialInstrumentPerformanceStatusAxis
= banc_NonperformingFinancialInstrumentsMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_ProductOrServiceAxis
= banc_InterestOnlyLoansMember
  2,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancialInstrumentPerformanceStatusAxis
= banc_NonperformingFinancialInstrumentsMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_ProductOrServiceAxis
= banc_InterestOnlyLoansMember
Nonperforming Financing Receivable | Non-Traditional Mortgages (NTM) | Negative amortization      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancialInstrumentPerformanceStatusAxis
= banc_NonperformingFinancialInstrumentsMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_ProductOrServiceAxis
= banc_NegativeAmortizationLoansMember
  0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancialInstrumentPerformanceStatusAxis
= banc_NonperformingFinancialInstrumentsMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_ProductOrServiceAxis
= banc_NegativeAmortizationLoansMember