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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 | $ 3,933,715,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | $ 2,396,995,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | 3,949,122,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Number of Loans | 2 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 |
Loans delinquent | 60 days |  |
Unpaid principal balances of PCI loans sold |  | 27,700,000 banc_CertainLoansAcquiredinTransferNotAccountedforasDebtSecuritiesUnpaidPrincipalBalanceSold |
Carrying value of loans sold |  | 16,100,000 banc_CertainLoansAcquiredinTransferNotAccountedforasDebtSecuritiesCarryingAmountSold |
Gain (loss) on PCI loans sold |  | 2,300,000 banc_CertainLoansAcquiredinTransferNotAccountedforasDebtSecuritiesGainLossonLoansSold |
Unfunded Loan Commitment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unfunded loan commitments | 1,900,000 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banc_UnfundedLoanCommitmentMember |  | 1,900,000 us-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 | 353,825,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember |  | 350,575,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember
Increase (decrease) in loans receivable | 3,300,000 banc_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 | 124,700,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember |  | 128,200,000 us-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 | 216,900,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember |  | 209,300,000 us-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 | 12,200,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_ProductOrServiceAxis = banc_NegativeAmortizationLoansMember |  | 13,100,000 us-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 | 10,700,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancialInstrumentPerformanceStatusAxis = banc_NonperformingFinancialInstrumentsMember / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_ProductOrServiceAxis = banc_GreenLoansMember |  | 12,500,000 us-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 | 3,000,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancialInstrumentPerformanceStatusAxis = banc_NonperformingFinancialInstrumentsMember / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_ProductOrServiceAxis = banc_InterestOnlyLoansMember |  | 2,000,000 us-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 | $ 0 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancialInstrumentPerformanceStatusAxis = banc_NonperformingFinancialInstrumentsMember / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_ProductOrServiceAxis = banc_NegativeAmortizationLoansMember |  | 0 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / banc_FinancialInstrumentPerformanceStatusAxis = banc_NonperformingFinancialInstrumentsMember / banc_FinancingReceivablePortfolioSegmentAxis = banc_NonTraditionalMortgagesLoanMember / us-gaap_ProductOrServiceAxis = banc_NegativeAmortizationLoansMember

X
- Definition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Sold + References No definition available. + Details
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- Definition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Gain (Loss) on Loans Sold + References No definition available. + Details
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- Definition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Unpaid Principal Balance, Sold + References No definition available. + Details
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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 -SubTopic 10 -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 + Details
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