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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) (USD $) | 3 Months Ended |
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Mar. 31, 2015 industry_group rolling_quarter banking_office loan_production_office | Mar. 31, 2014 | Dec. 31, 2014
Accounting Policies [Abstract] |  |  |
Number of banking offices | 38 banc_NumberOfBankingOffices |  |
Number of loan production offices | 61 banc_NumberOfProductionOffices |  |
Net deferred tax asset | $ 14,157,000 us-gaap_DeferredTaxAssetsLiabilitiesNet |  | $ 16,373,000 us-gaap_DeferredTaxAssetsLiabilitiesNet
Valuation allowance | 0 us-gaap_DeferredTaxAssetsValuationAllowance |  | 0 us-gaap_DeferredTaxAssetsValuationAllowance
Look-back period | 28 banc_AllowanceforLoanandLeaseLossesComparativeAnalysisLookbackPeriod |  |
Number of industry groups | 3 banc_AllowanceforLoanandLeaseLossesNumberofIndustryGroups |  |
Accounting Standards Update 2014-01 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect of change on equity or net assets |  |  | (274,000)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1 / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = banc_AccountingStandardsUpdate201401Member
Effect of change on net income |  | $ (8,000)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = banc_AccountingStandardsUpdate201401Member |

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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