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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Change in Accounting Principle - Consolidated Statements of Financial Condition (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Assets [Abstract]        
Cash and cash equivalents $ 265,402us-gaap_CashAndCashEquivalentsAtCarryingValue $ 231,199us-gaap_CashAndCashEquivalentsAtCarryingValue $ 333,639us-gaap_CashAndCashEquivalentsAtCarryingValue $ 110,118us-gaap_CashAndCashEquivalentsAtCarryingValue
Time deposits in financial institutions 1,900us-gaap_TimeDepositsAtCarryingValue 1,900us-gaap_TimeDepositsAtCarryingValue    
Securities available for sale 393,586us-gaap_AvailableForSaleSecuritiesDebtSecurities 345,695us-gaap_AvailableForSaleSecuritiesDebtSecurities    
Loans held for sale   1,187,090banc_DisposalGroupIncludingDiscontinuedOperationLoansReceivableCarriedatLowerorCostorFairValue    
Loans and leases receivable 3,904,370us-gaap_LoansAndLeasesReceivableNetReportedAmount 3,919,642us-gaap_LoansAndLeasesReceivableNetReportedAmount    
Deferred income tax 14,157us-gaap_DeferredTaxAssetsLiabilitiesNet 16,373us-gaap_DeferredTaxAssetsLiabilitiesNet    
Other assets   269,398us-gaap_OtherAssetsMiscellaneous    
Total Assets 6,097,355us-gaap_Assets 5,971,297us-gaap_Assets 4,030,465us-gaap_Assets  
Liabilities and Equity [Abstract]        
Liabilities 5,583,195us-gaap_Liabilities 5,467,982us-gaap_Liabilities    
Total stockholders’ equity 514,160us-gaap_StockholdersEquity 503,315us-gaap_StockholdersEquity 325,157us-gaap_StockholdersEquity 324,708us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity 6,097,355us-gaap_LiabilitiesAndStockholdersEquity 5,971,297us-gaap_LiabilitiesAndStockholdersEquity    
As Previously Reported        
Assets [Abstract]        
Cash and cash equivalents   231,199us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
333,639us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
110,118us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Time deposits in financial institutions   1,900us-gaap_TimeDepositsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
   
Securities available for sale   345,695us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
   
Loans held for sale   1,187,090banc_DisposalGroupIncludingDiscontinuedOperationLoansReceivableCarriedatLowerorCostorFairValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
   
Loans and leases receivable   3,919,642us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
   
Deferred income tax   16,445us-gaap_DeferredTaxAssetsLiabilitiesNet
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
   
Other assets   269,600us-gaap_OtherAssetsMiscellaneous
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
   
Total Assets   5,971,571us-gaap_Assets
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
   
Liabilities and Equity [Abstract]        
Liabilities   5,467,982us-gaap_Liabilities
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
   
Total stockholders’ equity   503,589us-gaap_StockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
   
Total liabilities and stockholders’ equity   5,971,571us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
   
Effect of Change in Accounting Principle        
Assets [Abstract]        
Cash and cash equivalents   0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
 
Time deposits in financial institutions   0us-gaap_TimeDepositsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
   
Securities available for sale   0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
   
Loans held for sale   0banc_DisposalGroupIncludingDiscontinuedOperationLoansReceivableCarriedatLowerorCostorFairValue
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
   
Loans and leases receivable   0us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
   
Deferred income tax   (72)us-gaap_DeferredTaxAssetsLiabilitiesNet
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
   
Other assets   (202)us-gaap_OtherAssetsMiscellaneous
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
   
Total Assets   (274)us-gaap_Assets
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
   
Liabilities and Equity [Abstract]        
Liabilities   0us-gaap_Liabilities
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
   
Total stockholders’ equity   (274)us-gaap_StockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
   
Total liabilities and stockholders’ equity   $ (274)us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember