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Income Taxes Income Taxes (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Apr. 07, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses $ 100,981us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses   $ 45,840us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
Interest on nonaccrual loans 7,394pacw_Interestonnonaccrualloans   444pacw_Interestonnonaccrualloans
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation 4,585us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation   4,541us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Deferred Tax Assets, Property, Plant and Equipment 5,359us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment   3,643us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Deferred tax assets, unrealized losses on other real estate owned 7,353pacw_DeferredTaxAssetsUnrealizedLossesOnOtherRealEstateOwned   9,784pacw_DeferredTaxAssetsUnrealizedLossesOnOtherRealEstateOwned
Assets acquired in FDIC-assisted acquisition 10,217pacw_AssetsacquiredinFDICassistedacquisition   16,375pacw_AssetsacquiredinFDICassistedacquisition
Deferred Tax Assets, State Taxes 5,009us-gaap_DeferredTaxAssetsStateTaxes   2,368us-gaap_DeferredTaxAssetsStateTaxes
Deferred Tax Assets, Operating Loss Carryforwards 207,575us-gaap_DeferredTaxAssetsOperatingLossCarryforwards   197us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred Tax Assets, Capital Loss Carryforwards 57,494us-gaap_DeferredTaxAssetsCapitalLossCarryforwards   0us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities 36,115us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities   16,629us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Deferred Tax Assets, Other 6,254us-gaap_DeferredTaxAssetsOther   8,084us-gaap_DeferredTaxAssetsOther
Deferred Tax Assets, Equity Method Investments 8,666us-gaap_DeferredTaxAssetsEquityMethodInvestments   568us-gaap_DeferredTaxAssetsEquityMethodInvestments
Deferred Tax Assets, Goodwill and Intangible Assets 44,372us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets   6,595us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Deferred Tax Assets, Deferred Income 0us-gaap_DeferredTaxAssetsDeferredIncome   378us-gaap_DeferredTaxAssetsDeferredIncome
Tax Credit Carryforward, Deferred Tax Asset 32,183us-gaap_TaxCreditCarryforwardDeferredTaxAsset   0us-gaap_TaxCreditCarryforwardDeferredTaxAsset
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross 0us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross   2,424us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross
Deferred Tax Assets, Gross 533,557us-gaap_DeferredTaxAssetsGross   117,870us-gaap_DeferredTaxAssetsGross
Deferred Tax Assets, Valuation Allowance (130,282)us-gaap_DeferredTaxAssetsValuationAllowance (130,700)us-gaap_DeferredTaxAssetsValuationAllowance 0us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets, Net of Valuation Allowance 403,275us-gaap_DeferredTaxAssetsNet   117,870us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities, Goodwill and Intangible Assets 3,978us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets   6,022us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets
Deferred Tax Liabilities, Tax Deferred Income 17,594us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome   0us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome
Deferred Tax Liabilities, Other Comprehensive Income 17,926us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome   0us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome
Deferred Tax Liabilities, Regulatory Assets 2,820us-gaap_DeferredTaxLiabilitiesRegulatoryAssets   7,123us-gaap_DeferredTaxLiabilitiesRegulatoryAssets
Deferred Tax Liabilities, Subordinated Debt 40,369pacw_DeferredTaxLiabilitiesSubordinatedDebt   1,003pacw_DeferredTaxLiabilitiesSubordinatedDebt
Deferred Tax Liabilities, Leasing Arrangements 34,136us-gaap_DeferredTaxLiabilitiesLeasingArrangements   0us-gaap_DeferredTaxLiabilitiesLeasingArrangements
Unrealized income from FDIC-assisted acquisition 2,041pacw_UnrealizedincomefromFDICassistedacquisition   24,086pacw_UnrealizedincomefromFDICassistedacquisition
Deferred Tax Liabilities, Gross 118,864us-gaap_DeferredIncomeTaxLiabilities   38,234us-gaap_DeferredIncomeTaxLiabilities
Deferred Tax Assets, Net $ 284,411us-gaap_DeferredTaxAssetsLiabilitiesNet   $ 79,636us-gaap_DeferredTaxAssetsLiabilitiesNet