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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) (USD $)	3 Months Ended
	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	38banc_NumberOfBankingOffices
Number of loan production offices	61banc_NumberOfProductionOffices
Net deferred tax asset	$ 14,157,000us-gaap_DeferredTaxAssetsLiabilitiesNet		$ 16,373,000us-gaap_DeferredTaxAssetsLiabilitiesNet
Valuation allowance	0us-gaap_DeferredTaxAssetsValuationAllowance		0us-gaap_DeferredTaxAssetsValuationAllowance
Look-back period	28banc_AllowanceforLoanandLeaseLossesComparativeAnalysisLookbackPeriod
Number of industry groups	3banc_AllowanceforLoanandLeaseLossesNumberofIndustryGroups
Accounting Standards Update 2014-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
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Effect of change on net income		$ (8,000)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = banc_AccountingStandardsUpdate201401Member

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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.

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