<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2023 Workiva-->
<!--r:2c0bce51-8ea1-42d7-beee-3f1ce491fc68,g:294f2ff8-3635-4935-9015-2483d96a7a05-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:pacw="http://www.pacwestbancorp.com/20230331" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2020-01-21" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.pacwestbancorp.com/20230331">
  <xs:import namespace="http://fasb.org/srt/2021-01-31" schemaLocation="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2021-01-31" schemaLocation="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd"/>
  <xs:import namespace="http://www.w3.org/1999/xlink" schemaLocation="http://www.xbrl.org/2003/xlink-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2020-01-21" schemaLocation="https://www.xbrl.org/dtr/type/2020-01-21/types.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2021q4" schemaLocation="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="pacw-20230331_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="pacw-20230331_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="pacw-20230331_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="pacw-20230331_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="CoverPage" roleURI="http://www.pacwestbancorp.com/role/CoverPage">
        <link:definition>0000001 - Document - Cover Page</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedBalanceSheets" roleURI="http://www.pacwestbancorp.com/role/CondensedConsolidatedBalanceSheets">
        <link:definition>0000002 - Statement - Condensed Consolidated Balance Sheets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedStatementsofEarnings" roleURI="http://www.pacwestbancorp.com/role/CondensedConsolidatedStatementsofEarnings">
        <link:definition>0000003 - Statement - Condensed Consolidated Statements of Earnings</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedStatementsofComprehensiveIncome" roleURI="http://www.pacwestbancorp.com/role/CondensedConsolidatedStatementsofComprehensiveIncome">
        <link:definition>0000004 - Statement - Condensed Consolidated Statements of Comprehensive Income</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedStatementsofChangesinStockholdersEquity" roleURI="http://www.pacwestbancorp.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity">
        <link:definition>0000005 - Statement - Condensed Consolidated Statements of Changes in Stockholders' Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedStatementsofCashFlows" roleURI="http://www.pacwestbancorp.com/role/CondensedConsolidatedStatementsofCashFlows">
        <link:definition>0000006 - Statement - Condensed Consolidated Statements of Cash Flows</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedBalanceSheetsParenthetical" roleURI="http://www.pacwestbancorp.com/role/CondensedConsolidatedBalanceSheetsParenthetical">
        <link:definition>0000007 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Organization" roleURI="http://www.pacwestbancorp.com/role/Organization">
        <link:definition>0000008 - Disclosure - Organization</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RestrictedCashBalances" roleURI="http://www.pacwestbancorp.com/role/RestrictedCashBalances">
        <link:definition>0000009 - Disclosure - Restricted Cash Balances</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentSecurities" roleURI="http://www.pacwestbancorp.com/role/InvestmentSecurities">
        <link:definition>0000010 - Disclosure - Investment Securities</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandLeases" roleURI="http://www.pacwestbancorp.com/role/LoansandLeases">
        <link:definition>0000011 - Disclosure - Loans and Leases</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ForeclosedAssets" roleURI="http://www.pacwestbancorp.com/role/ForeclosedAssets">
        <link:definition>0000012 - Disclosure - Foreclosed Assets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillandOtherIntangibleAssets" roleURI="http://www.pacwestbancorp.com/role/GoodwillandOtherIntangibleAssets">
        <link:definition>0000013 - Disclosure - Goodwill and Other Intangible Assets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherAssets" roleURI="http://www.pacwestbancorp.com/role/OtherAssets">
        <link:definition>0000014 - Disclosure - Other Assets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Leases" roleURI="http://www.pacwestbancorp.com/role/Leases">
        <link:definition>0000015 - Disclosure - Leases</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BorrowingsandSubordinatedDebentures" roleURI="http://www.pacwestbancorp.com/role/BorrowingsandSubordinatedDebentures">
        <link:definition>0000016 - Disclosure - Borrowings and Subordinated Debentures</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Derivatives" roleURI="http://www.pacwestbancorp.com/role/Derivatives">
        <link:definition>0000017 - Disclosure - Derivatives</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingencies" roleURI="http://www.pacwestbancorp.com/role/CommitmentsandContingencies">
        <link:definition>0000018 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueElection" roleURI="http://www.pacwestbancorp.com/role/FairValueElection">
        <link:definition>0000019 - Disclosure - Fair Value Election</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurements" roleURI="http://www.pacwestbancorp.com/role/FairValueMeasurements">
        <link:definition>0000020 - Disclosure - Fair Value Measurements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsLossPerShare" roleURI="http://www.pacwestbancorp.com/role/EarningsLossPerShare">
        <link:definition>0000021 - Disclosure - Earnings (Loss) Per Share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueFromContractsWithCustomers" roleURI="http://www.pacwestbancorp.com/role/RevenueFromContractsWithCustomers">
        <link:definition>0000022 - Disclosure - Revenue From Contracts With Customers</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquity" roleURI="http://www.pacwestbancorp.com/role/StockholdersEquity">
        <link:definition>0000023 - Disclosure - Stockholders' Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RecentlyIssuedAccountingStandards" roleURI="http://www.pacwestbancorp.com/role/RecentlyIssuedAccountingStandards">
        <link:definition>0000024 - Disclosure - Recently Issued Accounting Standards</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SubsequentEvents" roleURI="http://www.pacwestbancorp.com/role/SubsequentEvents">
        <link:definition>0000025 - Disclosure - Subsequent Events</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OrganizationOrganizationPolicies" roleURI="http://www.pacwestbancorp.com/role/OrganizationOrganizationPolicies">
        <link:definition>0000026 - Disclosure - Organization Organization (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasuresandDisclosuresPolicies" roleURI="http://www.pacwestbancorp.com/role/FairValueMeasuresandDisclosuresPolicies">
        <link:definition>0000027 - Disclosure - Fair Value Measures and Disclosures (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueDisclosuresPolicies" roleURI="http://www.pacwestbancorp.com/role/FairValueDisclosuresPolicies">
        <link:definition>0000028 - Disclosure - Fair Value Disclosures (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentSecuritiesTables" roleURI="http://www.pacwestbancorp.com/role/InvestmentSecuritiesTables">
        <link:definition>0000029 - Disclosure - Investment Securities (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandLeasesTables" roleURI="http://www.pacwestbancorp.com/role/LoansandLeasesTables">
        <link:definition>0000030 - Disclosure - Loans and Leases (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ForeclosedAssetsTables" roleURI="http://www.pacwestbancorp.com/role/ForeclosedAssetsTables">
        <link:definition>0000031 - Disclosure - Foreclosed Assets (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillandOtherIntangibleAssetsTables" roleURI="http://www.pacwestbancorp.com/role/GoodwillandOtherIntangibleAssetsTables">
        <link:definition>0000032 - Disclosure - Goodwill and Other Intangible Assets (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherAssetsTables" roleURI="http://www.pacwestbancorp.com/role/OtherAssetsTables">
        <link:definition>0000033 - Disclosure - Other Assets (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesTables" roleURI="http://www.pacwestbancorp.com/role/LeasesTables">
        <link:definition>0000034 - Disclosure - Leases (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BorrowingsandSubordinatedDebenturesTables" roleURI="http://www.pacwestbancorp.com/role/BorrowingsandSubordinatedDebenturesTables">
        <link:definition>0000035 - Disclosure - Borrowings and Subordinated Debentures (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DerivativesTables" roleURI="http://www.pacwestbancorp.com/role/DerivativesTables">
        <link:definition>0000036 - Disclosure - Derivatives (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingenciesTables" roleURI="http://www.pacwestbancorp.com/role/CommitmentsandContingenciesTables">
        <link:definition>0000037 - Disclosure - Commitments and Contingencies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueElectionTables" roleURI="http://www.pacwestbancorp.com/role/FairValueElectionTables">
        <link:definition>0000038 - Disclosure - Fair Value Election (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsTables" roleURI="http://www.pacwestbancorp.com/role/FairValueMeasurementsTables">
        <link:definition>0000039 - Disclosure - Fair Value Measurements (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsLossPerShareTables" roleURI="http://www.pacwestbancorp.com/role/EarningsLossPerShareTables">
        <link:definition>0000040 - Disclosure - Earnings (Loss) Per Share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueFromContractsWithCustomersTables" roleURI="http://www.pacwestbancorp.com/role/RevenueFromContractsWithCustomersTables">
        <link:definition>0000041 - Disclosure - Revenue From Contracts With Customers (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RecentlyIssuedAccountingStandardsTables" roleURI="http://www.pacwestbancorp.com/role/RecentlyIssuedAccountingStandardsTables">
        <link:definition>0000042 - Disclosure - Recently Issued Accounting Standards (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OrganizationNarrativeDetails" roleURI="http://www.pacwestbancorp.com/role/OrganizationNarrativeDetails">
        <link:definition>0000043 - Disclosure - Organization - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RestrictedCashBalancesNarrativeDetails" roleURI="http://www.pacwestbancorp.com/role/RestrictedCashBalancesNarrativeDetails">
        <link:definition>0000044 - Disclosure - Restricted Cash Balances - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentSecuritiesSecuritiesAvailableforSaleDetails" roleURI="http://www.pacwestbancorp.com/role/InvestmentSecuritiesSecuritiesAvailableforSaleDetails">
        <link:definition>0000045 - Disclosure - Investment Securities - Securities Available for Sale (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentSecuritiesRealizedGainsandLossesonSecuritiesAvailableforSaleDetails" roleURI="http://www.pacwestbancorp.com/role/InvestmentSecuritiesRealizedGainsandLossesonSecuritiesAvailableforSaleDetails">
        <link:definition>0000046 - Disclosure - Investment Securities - Realized Gains and Losses on Securities Available-for-Sale (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentSecuritiesUnrealizedLossesonSecuritiesAvailableforSaleDetails" roleURI="http://www.pacwestbancorp.com/role/InvestmentSecuritiesUnrealizedLossesonSecuritiesAvailableforSaleDetails">
        <link:definition>0000047 - Disclosure - Investment Securities - Unrealized Losses on Securities Available-for-Sale (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentSecuritiesContractualMaturitiesofSecuritiesAvailableforSaleDetails" roleURI="http://www.pacwestbancorp.com/role/InvestmentSecuritiesContractualMaturitiesofSecuritiesAvailableforSaleDetails">
        <link:definition>0000048 - Disclosure - Investment Securities - Contractual Maturities of Securities Available-for-Sale (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentSecuritiesSecuritiesHeldtoMaturityDetails" roleURI="http://www.pacwestbancorp.com/role/InvestmentSecuritiesSecuritiesHeldtoMaturityDetails">
        <link:definition>0000049 - Disclosure - Investment Securities - Securities Held-to-Maturity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentSecuritiesSecuritiesHeldtoMaturityAllowanceforCreditLossesDetails" roleURI="http://www.pacwestbancorp.com/role/InvestmentSecuritiesSecuritiesHeldtoMaturityAllowanceforCreditLossesDetails">
        <link:definition>0000050 - Disclosure - Investment Securities - Securities Held-to-Maturity Allowance for Credit Losses (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentSecuritiesSecuritiesHeldtoMaturityCreditQualityIndicatorsDetails" roleURI="http://www.pacwestbancorp.com/role/InvestmentSecuritiesSecuritiesHeldtoMaturityCreditQualityIndicatorsDetails">
        <link:definition>0000051 - Disclosure - Investment Securities - Securities Held-to-Maturity Credit Quality Indicators (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentSecuritiesSecuritiesHeldtoMaturityContractualMaturitiesDetails" roleURI="http://www.pacwestbancorp.com/role/InvestmentSecuritiesSecuritiesHeldtoMaturityContractualMaturitiesDetails">
        <link:definition>0000052 - Disclosure - Investment Securities - Securities Held-to-Maturity Contractual Maturities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentSecuritiesInterestIncomeonInvestmentSecuritiesDetails" roleURI="http://www.pacwestbancorp.com/role/InvestmentSecuritiesInterestIncomeonInvestmentSecuritiesDetails">
        <link:definition>0000053 - Disclosure - Investment Securities - Interest Income on Investment Securities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentSecuritiesNarrativeDetails" roleURI="http://www.pacwestbancorp.com/role/InvestmentSecuritiesNarrativeDetails">
        <link:definition>0000054 - Disclosure - Investment Securities - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandLeasesLoansandLeasesHeldforInvestmentDetails" roleURI="http://www.pacwestbancorp.com/role/LoansandLeasesLoansandLeasesHeldforInvestmentDetails">
        <link:definition>0000055 - Disclosure - Loans and Leases - Loans and Leases Held for Investment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandLeasesAgingAnalysisofLoansandLeasesHeldforInvestmentDetails" roleURI="http://www.pacwestbancorp.com/role/LoansandLeasesAgingAnalysisofLoansandLeasesHeldforInvestmentDetails">
        <link:definition>0000056 - Disclosure - Loans and Leases - Aging Analysis of Loans and Leases Held for Investment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandLeasesNonaccrualandPerformingLoansandLeasesHeldforInvestmentDetails" roleURI="http://www.pacwestbancorp.com/role/LoansandLeasesNonaccrualandPerformingLoansandLeasesHeldforInvestmentDetails">
        <link:definition>0000057 - Disclosure - Loans and Leases - Nonaccrual and Performing Loans and Leases Held for Investment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandLeasesCreditRiskRatingCategoriesforLoansandLeasesHeldforInvestmentDetails" roleURI="http://www.pacwestbancorp.com/role/LoansandLeasesCreditRiskRatingCategoriesforLoansandLeasesHeldforInvestmentDetails">
        <link:definition>0000058 - Disclosure - Loans and Leases - Credit Risk Rating Categories for Loans and Leases Held for Investment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandLeasesNonaccrualLoansandLeasesbyLoanPortfolioSegmentandClassDetails" roleURI="http://www.pacwestbancorp.com/role/LoansandLeasesNonaccrualLoansandLeasesbyLoanPortfolioSegmentandClassDetails">
        <link:definition>0000059 - Disclosure - Loans and Leases - Nonaccrual Loans and Leases by Loan Portfolio Segment and Class (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandLeasesLoansHeldforInvestmentbyLoanPortfolioSegmentDetails" roleURI="http://www.pacwestbancorp.com/role/LoansandLeasesLoansHeldforInvestmentbyLoanPortfolioSegmentDetails">
        <link:definition>0000060 - Disclosure - Loans and Leases - Loans Held for Investment by Loan Portfolio Segment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandLeasesLoanModificationorRefinancingDetails" roleURI="http://www.pacwestbancorp.com/role/LoansandLeasesLoanModificationorRefinancingDetails">
        <link:definition>0000061 - Disclosure - Loans and Leases - Loan Modification or Refinancing (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandLeasesPaymentStatusofLoanModificationsDetails" roleURI="http://www.pacwestbancorp.com/role/LoansandLeasesPaymentStatusofLoanModificationsDetails">
        <link:definition>0000062 - Disclosure - Loans and Leases - Payment Status of Loan Modifications (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandLeasesSubsequentlyDefaultedLoanModificationsDetails" roleURI="http://www.pacwestbancorp.com/role/LoansandLeasesSubsequentlyDefaultedLoanModificationsDetails">
        <link:definition>0000063 - Disclosure - Loans and Leases - Subsequently Defaulted Loan Modifications (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandLeasesTroubledDebtRestructuringsofLoansHeldforInvestmentbyLoanPortfolioSegmentDetails" roleURI="http://www.pacwestbancorp.com/role/LoansandLeasesTroubledDebtRestructuringsofLoansHeldforInvestmentbyLoanPortfolioSegmentDetails">
        <link:definition>0000064 - Disclosure - Loans and Leases - Troubled Debt Restructurings of Loans Held for Investment by Loan Portfolio Segment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandLeasesLeasesReceivableIncomeDetails" roleURI="http://www.pacwestbancorp.com/role/LoansandLeasesLeasesReceivableIncomeDetails">
        <link:definition>0000065 - Disclosure - Loans and Leases - Leases Receivable Income (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandLeasesComponentsofLeasesReceivableDetails" roleURI="http://www.pacwestbancorp.com/role/LoansandLeasesComponentsofLeasesReceivableDetails">
        <link:definition>0000066 - Disclosure - Loans and Leases - Components of Leases Receivable (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandLeasesMaturitiesofLeasesReceivableDetails" roleURI="http://www.pacwestbancorp.com/role/LoansandLeasesMaturitiesofLeasesReceivableDetails">
        <link:definition>0000067 - Disclosure - Loans and Leases - Maturities of Leases Receivable (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandLeasesMaturitiesofLeasesReceivableDetails_1" roleURI="http://www.pacwestbancorp.com/role/LoansandLeasesMaturitiesofLeasesReceivableDetails_1">
        <link:definition>0000067 - Disclosure - Loans and Leases - Maturities of Leases Receivable (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandLeasesAllowanceforLoanandLeaseLossesDetails" roleURI="http://www.pacwestbancorp.com/role/LoansandLeasesAllowanceforLoanandLeaseLossesDetails">
        <link:definition>0000068 - Disclosure - Loans and Leases - Allowance for Loan and Lease Losses (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandLeasesCollateralDependentLoansHeldforInvestmentDetails" roleURI="http://www.pacwestbancorp.com/role/LoansandLeasesCollateralDependentLoansHeldforInvestmentDetails">
        <link:definition>0000069 - Disclosure - Loans and Leases - Collateral Dependent Loans Held for Investment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandLeasesAllowanceforLoanandLeaseLossesandReserveforUnfundedLoanCommitmentsDetails" roleURI="http://www.pacwestbancorp.com/role/LoansandLeasesAllowanceforLoanandLeaseLossesandReserveforUnfundedLoanCommitmentsDetails">
        <link:definition>0000070 - Disclosure - Loans and Leases - Allowance for Loan and Lease Losses and Reserve for Unfunded Loan Commitments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandLeasesNarrativeDetails" roleURI="http://www.pacwestbancorp.com/role/LoansandLeasesNarrativeDetails">
        <link:definition>0000071 - Disclosure - Loans and Leases - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ForeclosedAssetsSummaryofForeclosedAssetsDetails" roleURI="http://www.pacwestbancorp.com/role/ForeclosedAssetsSummaryofForeclosedAssetsDetails">
        <link:definition>0000072 - Disclosure - Foreclosed Assets - Summary of Foreclosed Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ForeclosedAssetsChangesinForeclosedAssetsDetails" roleURI="http://www.pacwestbancorp.com/role/ForeclosedAssetsChangesinForeclosedAssetsDetails">
        <link:definition>0000073 - Disclosure - Foreclosed Assets - Changes in Foreclosed Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillandOtherIntangibleAssetsTextualDetails" roleURI="http://www.pacwestbancorp.com/role/GoodwillandOtherIntangibleAssetsTextualDetails">
        <link:definition>0000074 - Disclosure - Goodwill and Other Intangible Assets Textual (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillandOtherIntangibleAssetsGoodwillRollforwardDetails" roleURI="http://www.pacwestbancorp.com/role/GoodwillandOtherIntangibleAssetsGoodwillRollforwardDetails">
        <link:definition>0000075 - Disclosure - Goodwill and Other Intangible Assets Goodwill Rollforward (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillandOtherIntangibleAssetsRollforwardofCDIandCRIDetails" roleURI="http://www.pacwestbancorp.com/role/GoodwillandOtherIntangibleAssetsRollforwardofCDIandCRIDetails">
        <link:definition>0000076 - Disclosure - Goodwill and Other Intangible Assets - Rollforward of CDI and CRI (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillandOtherIntangibleAssetsDetails" roleURI="http://www.pacwestbancorp.com/role/GoodwillandOtherIntangibleAssetsDetails">
        <link:definition>0000077 - Disclosure - Goodwill and Other Intangible Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherAssetsDetails" roleURI="http://www.pacwestbancorp.com/role/OtherAssetsDetails">
        <link:definition>0000078 - Disclosure - Other Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesLeasesLeaseExpenseDetails" roleURI="http://www.pacwestbancorp.com/role/LeasesLeasesLeaseExpenseDetails">
        <link:definition>0000079 - Disclosure - Leases Leases - Lease Expense (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesSupplementalCashFlowInformationDetails" roleURI="http://www.pacwestbancorp.com/role/LeasesSupplementalCashFlowInformationDetails">
        <link:definition>0000080 - Disclosure - Leases - Supplemental Cash Flow Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesSupplementalBalanceSheetandOtherInformationDetails" roleURI="http://www.pacwestbancorp.com/role/LeasesSupplementalBalanceSheetandOtherInformationDetails">
        <link:definition>0000081 - Disclosure - Leases - Supplemental Balance Sheet and Other Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesMaturitiesofOperatingLeaseLiabilitiesDetails" roleURI="http://www.pacwestbancorp.com/role/LeasesMaturitiesofOperatingLeaseLiabilitiesDetails">
        <link:definition>0000082 - Disclosure - Leases - Maturities of Operating Lease Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesMaturitiesofOperatingLeaseLiabilitiesDetails_1" roleURI="http://www.pacwestbancorp.com/role/LeasesMaturitiesofOperatingLeaseLiabilitiesDetails_1">
        <link:definition>0000082 - Disclosure - Leases - Maturities of Operating Lease Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesLeasesScheduleofPaymentstobeReceivedonOperatingLeasesDetails" roleURI="http://www.pacwestbancorp.com/role/LeasesLeasesScheduleofPaymentstobeReceivedonOperatingLeasesDetails">
        <link:definition>0000083 - Disclosure - Leases Leases - Schedule of Payments to be Received on Operating Leases (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesNarrativeDetails" roleURI="http://www.pacwestbancorp.com/role/LeasesNarrativeDetails">
        <link:definition>0000084 - Disclosure - Leases - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BorrowingsandSubordinatedDebenturesSummaryofBorrowingsandDebenturesDetails" roleURI="http://www.pacwestbancorp.com/role/BorrowingsandSubordinatedDebenturesSummaryofBorrowingsandDebenturesDetails">
        <link:definition>0000085 - Disclosure - Borrowings and Subordinated Debentures - Summary of Borrowings and Debentures (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BorrowingsandSubordinatedDebenturesSubordinatedDebenturesDetails" roleURI="http://www.pacwestbancorp.com/role/BorrowingsandSubordinatedDebenturesSubordinatedDebenturesDetails">
        <link:definition>0000086 - Disclosure - Borrowings and Subordinated Debentures - Subordinated Debentures (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BorrowingsandSubordinatedDebenturesNarrativeDetails" roleURI="http://www.pacwestbancorp.com/role/BorrowingsandSubordinatedDebenturesNarrativeDetails">
        <link:definition>0000087 - Disclosure - Borrowings and Subordinated Debentures - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DerivativesDetails" roleURI="http://www.pacwestbancorp.com/role/DerivativesDetails">
        <link:definition>0000088 - Disclosure - Derivatives (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingenciesSummaryofCommitmentsDetails" roleURI="http://www.pacwestbancorp.com/role/CommitmentsandContingenciesSummaryofCommitmentsDetails">
        <link:definition>0000089 - Disclosure - Commitments and Contingencies - Summary of Commitments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingenciesYearsInWhichCommitmentsareExpectedtobePaidDetails" roleURI="http://www.pacwestbancorp.com/role/CommitmentsandContingenciesYearsInWhichCommitmentsareExpectedtobePaidDetails">
        <link:definition>0000090 - Disclosure - Commitments and Contingencies - Years In Which Commitments are Expected to be Paid (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingenciesNarrativeDetails" roleURI="http://www.pacwestbancorp.com/role/CommitmentsandContingenciesNarrativeDetails">
        <link:definition>0000091 - Disclosure - Commitments and Contingencies - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueElectionDetails" roleURI="http://www.pacwestbancorp.com/role/FairValueElectionDetails">
        <link:definition>0000092 - Disclosure - Fair Value Election (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueElectionCreditLinkNotesFairValueOptionDetails" roleURI="http://www.pacwestbancorp.com/role/FairValueElectionCreditLinkNotesFairValueOptionDetails">
        <link:definition>0000093 - Disclosure - Fair Value Election, Credit Link Notes Fair, Value Option (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueElectionCreditLinkFairValueDetails" roleURI="http://www.pacwestbancorp.com/role/FairValueElectionCreditLinkFairValueDetails">
        <link:definition>0000094 - Disclosure - Fair Value Election, Credit Link, Fair Value (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsNarrativeDetails" roleURI="http://www.pacwestbancorp.com/role/FairValueMeasurementsNarrativeDetails">
        <link:definition>0000095 - Disclosure - Fair Value Measurements - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsAssetsandLiabilitiesMeasuredandRecordedatFairValueonaRecurringBasisDetails" roleURI="http://www.pacwestbancorp.com/role/FairValueMeasurementsAssetsandLiabilitiesMeasuredandRecordedatFairValueonaRecurringBasisDetails">
        <link:definition>0000096 - Disclosure - Fair Value Measurements - Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsQuantitativeInputsandAssumptionsUsedforEquityWarrantsDetails" roleURI="http://www.pacwestbancorp.com/role/FairValueMeasurementsQuantitativeInputsandAssumptionsUsedforEquityWarrantsDetails">
        <link:definition>0000097 - Disclosure - Fair Value Measurements - Quantitative Inputs and Assumptions Used for Equity Warrants (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsActivityforLevel3AssetsMeasuredatFairValueonaRecurringBasisDetails" roleURI="http://www.pacwestbancorp.com/role/FairValueMeasurementsActivityforLevel3AssetsMeasuredatFairValueonaRecurringBasisDetails">
        <link:definition>0000098 - Disclosure - Fair Value Measurements - Activity for Level 3 Assets Measured at Fair Value on a Recurring Basis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsAssetsMeasuredatFairValueonaNonRecurringBasisDetails" roleURI="http://www.pacwestbancorp.com/role/FairValueMeasurementsAssetsMeasuredatFairValueonaNonRecurringBasisDetails">
        <link:definition>0000099 - Disclosure - Fair Value Measurements - Assets Measured at Fair Value on a Non-Recurring Basis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsLossesRecognizedonAssetsMeasuredonaNonrecurringBasisDetails" roleURI="http://www.pacwestbancorp.com/role/FairValueMeasurementsLossesRecognizedonAssetsMeasuredonaNonrecurringBasisDetails">
        <link:definition>0000100 - Disclosure - Fair Value Measurements - Losses Recognized on Assets Measured on a Nonrecurring Basis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsFairValueMeasurementsValuationMethodologyandUnobservableInputsforLevel3AssetsMeasuredatFairValueonaNonrecurringBasisDetails" roleURI="http://www.pacwestbancorp.com/role/FairValueMeasurementsFairValueMeasurementsValuationMethodologyandUnobservableInputsforLevel3AssetsMeasuredatFairValueonaNonrecurringBasisDetails">
        <link:definition>0000101 - Disclosure - Fair Value Measurements - Fair Value Measurements - Valuation Methodology and Unobservable Inputs for Level 3 Assets Measured at Fair Value on a Nonrecurring Basis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsCarryingAmountsandEstimatedFairValuesofCertainFinancialInstrumentsDetails" roleURI="http://www.pacwestbancorp.com/role/FairValueMeasurementsCarryingAmountsandEstimatedFairValuesofCertainFinancialInstrumentsDetails">
        <link:definition>0000102 - Disclosure - Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Certain Financial Instruments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsQuantitationsandAssumptionsforFairValueofAssetsServicedbyThirdPartyDetails" roleURI="http://www.pacwestbancorp.com/role/FairValueMeasurementsQuantitationsandAssumptionsforFairValueofAssetsServicedbyThirdPartyDetails">
        <link:definition>0000103 - Disclosure - Fair Value Measurements - Quantitations and Assumptions for Fair Value of Assets Serviced by Third Party (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsLossPerShareDetails" roleURI="http://www.pacwestbancorp.com/role/EarningsLossPerShareDetails">
        <link:definition>0000104 - Disclosure - Earnings (Loss) Per Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueFromContractsWithCustomersDisaggregationofRevenueDetails" roleURI="http://www.pacwestbancorp.com/role/RevenueFromContractsWithCustomersDisaggregationofRevenueDetails">
        <link:definition>0000105 - Disclosure - Revenue From Contracts With Customers - Disaggregation of Revenue (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueFromContractsWithCustomersDisaggregationofRevenueBasedonTimingofRevenueRecognitionDetails" roleURI="http://www.pacwestbancorp.com/role/RevenueFromContractsWithCustomersDisaggregationofRevenueBasedonTimingofRevenueRecognitionDetails">
        <link:definition>0000106 - Disclosure - Revenue From Contracts With Customers - Disaggregation of Revenue Based on Timing of Revenue Recognition (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueFromContractsWithCustomersContractBalancesDetails" roleURI="http://www.pacwestbancorp.com/role/RevenueFromContractsWithCustomersContractBalancesDetails">
        <link:definition>0000107 - Disclosure - Revenue From Contracts With Customers - Contract Balances (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueFromContractsWithCustomersNarrativeDetails" roleURI="http://www.pacwestbancorp.com/role/RevenueFromContractsWithCustomersNarrativeDetails">
        <link:definition>0000108 - Disclosure - Revenue From Contracts With Customers - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityNarrativeDetails" roleURI="http://www.pacwestbancorp.com/role/StockholdersEquityNarrativeDetails">
        <link:definition>0000109 - Disclosure - Stockholders' Equity - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SubsequentEventsDetails" roleURI="http://www.pacwestbancorp.com/role/SubsequentEventsDetails">
        <link:definition>0000110 - Disclosure - Subsequent Events (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="pacw_LoanReceivableTroubledDebtRestructuringAxis" abstract="true" name="LoanReceivableTroubledDebtRestructuringAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="pacw_LoanContractualInterestChangeFromToDomain" abstract="true" name="LoanContractualInterestChangeFromToDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_CommercialRealEstateConstructionLoanReceivableMember" abstract="true" name="CommercialRealEstateConstructionLoanReceivableMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_ServicingRights" abstract="false" name="ServicingRights" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_PacWest2017StockIncentivePlanMember" abstract="true" name="PacWest2017StockIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_CollateraldependentFinanceReceivable" abstract="false" name="CollateraldependentFinanceReceivable" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_ServiceChargesOnDepositAccountsMember" abstract="true" name="ServiceChargesOnDepositAccountsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_TermLoansByOriginationDateMember" abstract="true" name="TermLoansByOriginationDateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_FiniteLivedCoreDepositsCustomerRelationsNet" abstract="false" name="FiniteLivedCoreDepositsCustomerRelationsNet" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_SubordinatedDebtTrustVDueSeptember2033Member" abstract="true" name="SubordinatedDebtTrustVDueSeptember2033Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_SubordinatedDebentures" abstract="false" name="SubordinatedDebentures" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_LoanRestructuringAndRefinancingModificationsInterestRate" abstract="false" name="LoanRestructuringAndRefinancingModificationsInterestRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="pacw_DirectFinancingLeaseDeferredSellingProfitAndOther" abstract="false" name="DirectFinancingLeaseDeferredSellingProfitAndOther" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_LoanReceivableTroubledDebtRestructuringDomain" abstract="true" name="LoanReceivableTroubledDebtRestructuringDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_TrustPreferredSecuritiesTwoThousandSixSeriesFiveMember" abstract="true" name="TrustPreferredSecuritiesTwoThousandSixSeriesFiveMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_TimeBasedRestrictedStockAwardsMember" abstract="true" name="TimeBasedRestrictedStockAwardsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_CashCollateral" abstract="false" name="CashCollateral" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_TrustPreferredSecuritiesTwoThousandFiveSeriesTwoMember" abstract="true" name="TrustPreferredSecuritiesTwoThousandFiveSeriesTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_OriginationDate2021Member" abstract="true" name="OriginationDate2021Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_OriginationDate2019Member" abstract="true" name="OriginationDate2019Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_LoanReceivableRecordedInvestmentEqualtoGreaterthan90DaysPastDue" abstract="false" name="LoanReceivableRecordedInvestmentEqualtoGreaterthan90DaysPastDue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_LoanBalanceAmountTypeAxis" abstract="true" name="LoanBalanceAmountTypeAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="pacw_ContractWithCustomerLiabilitiesReclassifiedtoOtherAssets" abstract="false" name="ContractWithCustomerLiabilitiesReclassifiedtoOtherAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_MultiFamilyRealEstateLoansMember" abstract="true" name="MultiFamilyRealEstateLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_TrustPreferredSecuritiesTwoThousandSixSeriesThreeMember" abstract="true" name="TrustPreferredSecuritiesTwoThousandSixSeriesThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_CashandCashDueFromBanks" abstract="false" name="CashandCashDueFromBanks" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_LoanContractualInterestChangeFromToAxis" abstract="true" name="LoanContractualInterestChangeFromToAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="pacw_MoreThanTwelve12MonthsbutLessThanTwentyfour24MonthsMember" abstract="true" name="MoreThanTwelve12MonthsbutLessThanTwentyfour24MonthsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue" abstract="false" name="FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_FinanceReceivableLoanRestructuringAndRefinancingPaymentStatus" abstract="false" name="FinanceReceivableLoanRestructuringAndRefinancingPaymentStatus" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_Vestingperiodoftimebasedrestrictedstocklowerlimit" abstract="false" name="Vestingperiodoftimebasedrestrictedstocklowerlimit" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="pacw_FederalReserveBankAdvancesBranchofFederalReserveAxis" abstract="true" name="FederalReserveBankAdvancesBranchofFederalReserveAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="pacw_FairValueQuantitativeInputsAndAssumptionsForOutsideServicesTableTextBlock" abstract="false" name="FairValueQuantitativeInputsAndAssumptionsForOutsideServicesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pacw_HeldToMaturityInvestmentsClassifiedByContractualMaturityDateTableTextBlock" abstract="false" name="HeldToMaturityInvestmentsClassifiedByContractualMaturityDateTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pacw_PrivateLabelCollateralizedMortgageObligationsMember" abstract="true" name="PrivateLabelCollateralizedMortgageObligationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_FiniteLivedIntangibleAssetsFullyAmortizedPortion" abstract="false" name="FiniteLivedIntangibleAssetsFullyAmortizedPortion" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_NoninterestIncomeMember" abstract="true" name="NoninterestIncomeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_DividendsAndGainsLossesOnEquityInvestments" abstract="false" name="DividendsAndGainsLossesOnEquityInvestments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_FinanceReceivableAllowanceForLoanLossesTableTextBlock" abstract="false" name="FinanceReceivableAllowanceForLoanLossesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pacw_UnrealizedGainLossonDerivativesandForeignCurrenciesNet" abstract="false" name="UnrealizedGainLossonDerivativesandForeignCurrenciesNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_DerivateContractsDomain" abstract="true" name="DerivateContractsDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_A34PassMember" abstract="true" name="A34PassMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_TwoThousandSixTwoTermDebtSecuritizationMember" abstract="true" name="TwoThousandSixTwoTermDebtSecuritizationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_OtherrealestateandforeclosedassetsMember" abstract="true" name="OtherrealestateandforeclosedassetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_ReserveforUnfundedCommitmentsProvision" abstract="false" name="ReserveforUnfundedCommitmentsProvision" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_OtherRealEstateOwnedandForeclosedAssetsTableTextBlock" abstract="false" name="OtherRealEstateOwnedandForeclosedAssetsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pacw_AssetsAndLiabilitiesLesseeTableTextBlock" abstract="false" name="AssetsAndLiabilitiesLesseeTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pacw_LoanContractualInterestChangeToRateMember" abstract="true" name="LoanContractualInterestChangeToRateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_OtherBorrowingsFairValueDisclosure" abstract="false" name="OtherBorrowingsFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_LoanContractualRateReductionMember" abstract="true" name="LoanContractualRateReductionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_PerformanceSharesTwoMember" abstract="true" name="PerformanceSharesTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_FinanceReceivableLoanRestructuringAndRefinancingPercentOfAmortizedLoanPortfolioClass" abstract="false" name="FinanceReceivableLoanRestructuringAndRefinancingPercentOfAmortizedLoanPortfolioClass" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="pacw_DividendsAndGainsLossesOnEquityInvestmentsMember" abstract="true" name="DividendsAndGainsLossesOnEquityInvestmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_PacWest2017RevisedStockIncentivePlanMember" abstract="true" name="PacWest2017RevisedStockIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_FinancingReceivableAllowanceForReceivableChargeOffsAndRecoveriesTable" abstract="true" name="FinancingReceivableAllowanceForReceivableChargeOffsAndRecoveriesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="pacw_NonaccrualMember" abstract="true" name="NonaccrualMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_OriginationDate2017Member" abstract="true" name="OriginationDate2017Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_TransferstoAvailableForSale" abstract="false" name="TransferstoAvailableForSale" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_AvailableForSaleInvestmentSecuritiesSoldAtAmortizedCost" abstract="false" name="AvailableForSaleInvestmentSecuritiesSoldAtAmortizedCost" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_SubordinatedDebtTrustCIIIDueSeptember2035Member" abstract="true" name="SubordinatedDebtTrustCIIIDueSeptember2035Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis" abstract="true" name="CommercialCollateralizedFinancingReceivableLoanTypeAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="pacw_DerivateContractsAxis" abstract="true" name="DerivateContractsAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="pacw_RecentlyIssuedAccountingStandardsAbstract" abstract="true" name="RecentlyIssuedAccountingStandardsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pacw_NetLossesGainsOnNonrecurringAssetsTableTextBlock" abstract="false" name="NetLossesGainsOnNonrecurringAssetsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pacw_CombinationTermExtensionAndInterestRateReductionMember" abstract="true" name="CombinationTermExtensionAndInterestRateReductionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_PledgedCashforDerivativeContracts" abstract="false" name="PledgedCashforDerivativeContracts" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_GainOnSaleOfSecuritiesMember" abstract="true" name="GainOnSaleOfSecuritiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_NetIncreaseDecreaseInOperatingLeaseLeasedEquipmentToOthers" abstract="false" name="NetIncreaseDecreaseInOperatingLeaseLeasedEquipmentToOthers" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_AssetBasedMember" abstract="true" name="AssetBasedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_BankTermFundingProgramMember" abstract="true" name="BankTermFundingProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_InterestRateContractsMember" abstract="true" name="InterestRateContractsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_SubordinatedDebtTrustFCBIDueDecember2035Member" abstract="true" name="SubordinatedDebtTrustFCBIDueDecember2035Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_ProvisionTypeAxis" abstract="true" name="ProvisionTypeAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="pacw_LoanRestructuringAndRefinancingConcessionTypeAxis" abstract="true" name="LoanRestructuringAndRefinancingConcessionTypeAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="pacw_Vestingperiodoftimebasedrestrictedstockhigherlimit" abstract="false" name="Vestingperiodoftimebasedrestrictedstockhigherlimit" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="pacw_RealEstateConstructionLoanTypeDomain" abstract="true" name="RealEstateConstructionLoanTypeDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_IncreaseDecreaseInNoninterestBearingDomesticandForeignDeposits" abstract="false" name="IncreaseDecreaseInNoninterestBearingDomesticandForeignDeposits" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_CombinationTermExtensionAndPaymentDelayMember" abstract="true" name="CombinationTermExtensionAndPaymentDelayMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_NoDiscountsMember" abstract="true" name="NoDiscountsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_PerformanceSharesOneMember" abstract="true" name="PerformanceSharesOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_NetchangeinFLHBStock" abstract="false" name="NetchangeinFLHBStock" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance" abstract="false" name="FinanceReceivableLoanRestructuringAndRefinancingAmortizedBalance" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_NonaccrualLoansAndLeasesBenchmarkMember" abstract="true" name="NonaccrualLoansAndLeasesBenchmarkMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_Restrictedstocksurrendered" abstract="false" name="Restrictedstocksurrendered" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_OCIDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAOCIForAmortizationOfGainLossAfterTax1" abstract="false" name="OCIDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAOCIForAmortizationOfGainLossAfterTax1" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_A68ClassifiedMember" abstract="true" name="A68ClassifiedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_NonPurchasedCreditImpairedLoansAndLeasesMember" abstract="true" name="NonPurchasedCreditImpairedLoansAndLeasesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_ForeignExchangeContractsMember" abstract="true" name="ForeignExchangeContractsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_LowIncomeHousingTaxCreditLIHTC" abstract="false" name="LowIncomeHousingTaxCreditLIHTC" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_FairValueAssetsLevel3ToLevel2TransfersAmount" abstract="false" name="FairValueAssetsLevel3ToLevel2TransfersAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_A90OrMoreDaysPastDueMember" abstract="true" name="A90OrMoreDaysPastDueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_ReserveforUnfundedLoanCommitmentsChargeoffs" abstract="false" name="ReserveforUnfundedLoanCommitmentsChargeoffs" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_Level3CMORollForward" abstract="true" name="Level3CMORollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pacw_OtherMember" abstract="true" name="OtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_AssetsandLiabilitiesLessorTableTextBlock" abstract="false" name="AssetsandLiabilitiesLessorTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pacw_WarrantIncome" abstract="false" name="WarrantIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_InitialRateSpreadAxis" abstract="true" name="InitialRateSpreadAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="pacw_SubordinatedDebtTrustVIIDueApril2034Member" abstract="true" name="SubordinatedDebtTrustVIIDueApril2034Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_FairValueElectionPolicyTextBlock" abstract="false" name="FairValueElectionPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pacw_Interestandfeesreceivableincome" abstract="false" name="Interestandfeesreceivableincome" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_ReserveforUnfundedLoanCommitmentsNetChargeoffs" abstract="false" name="ReserveforUnfundedLoanCommitmentsNetChargeoffs" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_PaymentDelayMember" abstract="true" name="PaymentDelayMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_HighestRateOfSpreadMember" abstract="true" name="HighestRateOfSpreadMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_EquityWarrantsMeasurementInput" abstract="false" name="EquityWarrantsMeasurementInput" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:decimalItemType"/>
  <xs:element id="pacw_CollateraldependentFinanceReceivableTableTextBlock" abstract="false" name="CollateraldependentFinanceReceivableTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pacw_LoansAndLeasesReceivableNetOfDeferredIncomeNotPastDue" abstract="false" name="LoansAndLeasesReceivableNetOfDeferredIncomeNotPastDue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_RevenueFromContractsWithCustomersAbstract" abstract="true" name="RevenueFromContractsWithCustomersAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pacw_AmortizationOfUnrealizedNetLossOnSecuritiesTransferredFromAvailableForSaleToHeldToMaturityNetOfTax" abstract="false" name="AmortizationOfUnrealizedNetLossOnSecuritiesTransferredFromAvailableForSaleToHeldToMaturityNetOfTax" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_TotalNetGainLossFromNonrecurringAssets" abstract="false" name="TotalNetGainLossFromNonrecurringAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_OperatingLeaseAssetsAndLiabilitiesLesseeAbstract" abstract="true" name="OperatingLeaseAssetsAndLiabilitiesLesseeAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pacw_FinanceReceivableLoanModificationsPaymentStatusTableTextBlock" abstract="false" name="FinanceReceivableLoanModificationsPaymentStatusTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pacw_LessThanOneYearMember" abstract="true" name="LessThanOneYearMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_OtherForeclosedAssetsRollforwardTableTextBlock" abstract="false" name="OtherForeclosedAssetsRollforwardTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pacw_CashFlowLesseeAbstract" abstract="true" name="CashFlowLesseeAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pacw_RisksAndUncertaintiesMarketVolatilityTextBlock" abstract="false" name="RisksAndUncertaintiesMarketVolatilityTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pacw_BorrowingsCreditLinkNotes" abstract="false" name="BorrowingsCreditLinkNotes" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_TermLoanOriginationDateDomain" abstract="true" name="TermLoanOriginationDateDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_BusinessAssetsMember" abstract="true" name="BusinessAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_NetIncomeLossFromContinuingOperationAvailableToCommonStockholdersBasic" abstract="false" name="NetIncomeLossFromContinuingOperationAvailableToCommonStockholdersBasic" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_ProceedsFromSalesofLoansandLeases" abstract="false" name="ProceedsFromSalesofLoansandLeases" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_ClassifiedMember" abstract="true" name="ClassifiedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_FinancingReceivableAllowanceforCreditLossAdditionalInformationPortfolioCompositionAbstract" abstract="true" name="FinancingReceivableAllowanceforCreditLossAdditionalInformationPortfolioCompositionAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pacw_LowestRateOfSpreadAxis" abstract="true" name="LowestRateOfSpreadAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="pacw_OtherCommercialMember" abstract="true" name="OtherCommercialMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_RightOfUseAssetObtainedInExchangeForLeaseLiabilityAbstract" abstract="true" name="RightOfUseAssetObtainedInExchangeForLeaseLiabilityAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pacw_CommercialCollateralizedFinancingReceivableLoanTypeDomain" abstract="true" name="CommercialCollateralizedFinancingReceivableLoanTypeDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_DerivativesAbstract" abstract="true" name="DerivativesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pacw_ReserveforUnfundedLoanCommitmentsRecoveries" abstract="false" name="ReserveforUnfundedLoanCommitmentsRecoveries" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_RestrictedStockAmortization" abstract="false" name="RestrictedStockAmortization" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_ProvisionForLoanLeasesAndUnfundedLoanCommitments" abstract="false" name="ProvisionForLoanLeasesAndUnfundedLoanCommitments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_SecuritiesAvailableForSaleIncludingCoveredSecurities" abstract="false" name="SecuritiesAvailableForSaleIncludingCoveredSecurities" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_RealEstateConstructionMember" abstract="true" name="RealEstateConstructionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_FinanceReceivableAllowanceMember" abstract="true" name="FinanceReceivableAllowanceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_A5SpecialMentionMember" abstract="true" name="A5SpecialMentionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_CorporateDebtMeasurementInput" abstract="false" name="CorporateDebtMeasurementInput" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="pacw_ProvisionTypeDomain" abstract="true" name="ProvisionTypeDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_EquityWarrants" abstract="false" name="EquityWarrants" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_SubordinatedDebtTrustFCCIDueMarch2037Member" abstract="true" name="SubordinatedDebtTrustFCCIDueMarch2037Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_OtherDerivateAssetsMember" abstract="true" name="OtherDerivateAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_InitialRateSpreadDomain" abstract="true" name="InitialRateSpreadDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_OtherRealEstateOwnedNet" abstract="false" name="OtherRealEstateOwnedNet" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_OneToNineMonthsMember" abstract="true" name="OneToNineMonthsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_RevenueFromContractsWithCustomersTableTextBlock" abstract="false" name="RevenueFromContractsWithCustomersTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pacw_OtherResidentialRealEstateMember" abstract="true" name="OtherResidentialRealEstateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_A30To89DaysPastDueMember" abstract="true" name="A30To89DaysPastDueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_IncreaseDecreaseInInterestBearingDomesticAndForeignDeposits" abstract="false" name="IncreaseDecreaseInInterestBearingDomesticAndForeignDeposits" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_TwoThousandSixOneTermDebtSecuritizationMember" abstract="true" name="TwoThousandSixOneTermDebtSecuritizationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_RevenuePerformanceObligationSatisfiedAtPointInTime" abstract="false" name="RevenuePerformanceObligationSatisfiedAtPointInTime" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_EquityWarrantsMeasurementInputRemainingLife" abstract="false" name="EquityWarrantsMeasurementInputRemainingLife" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="pacw_SaleofForeclosedAssets" abstract="false" name="SaleofForeclosedAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_NoFinanceReceivableAllowanceMember" abstract="true" name="NoFinanceReceivableAllowanceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_EquipmentLeasedToOthersUnderOperatingLeases" abstract="false" name="EquipmentLeasedToOthersUnderOperatingLeases" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_RealEstateConstructionLoanTypeAxis" abstract="true" name="RealEstateConstructionLoanTypeAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="pacw_FairValueElectionAbstract" abstract="true" name="FairValueElectionAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pacw_HighestRateOfSpreadDomain" abstract="true" name="HighestRateOfSpreadDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_InterestMember" abstract="true" name="InterestMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_ProvisionforOtherRealEstateOwnedandForeclosedAssets" abstract="false" name="ProvisionforOtherRealEstateOwnedandForeclosedAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_DiscountedCashFlowMember" abstract="true" name="DiscountedCashFlowMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_DebtSecuritiesExercisesAndSettlements" abstract="false" name="DebtSecuritiesExercisesAndSettlements" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_GrossChargesByOriginationYear" abstract="false" name="GrossChargesByOriginationYear" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_StandardPoorsNoCreditRatingMember" abstract="true" name="StandardPoorsNoCreditRatingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_StockAndWarrantsPurchasedDuringPeriodValuePreferredStockAndWarrants" abstract="false" name="StockAndWarrantsPurchasedDuringPeriodValuePreferredStockAndWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_LowestRateOfSpreadMember" abstract="true" name="LowestRateOfSpreadMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_UnobservableInputsAxis" abstract="true" name="UnobservableInputsAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="pacw_ForeclosedRealEstateIncomeExpense" abstract="false" name="ForeclosedRealEstateIncomeExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_EuriborRateMember" abstract="true" name="EuriborRateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_SBICInvestments" abstract="false" name="SBICInvestments" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_ThirdPartyAppraisalsMember" abstract="true" name="ThirdPartyAppraisalsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_SubordinatedDebtTrustVIDueSeptember2033Member" abstract="true" name="SubordinatedDebtTrustVIDueSeptember2033Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_CommitmentToContributeCapitaltoCRARelatedPool" abstract="false" name="CommitmentToContributeCapitaltoCRARelatedPool" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_HighestRateOfSpreadAxis" abstract="true" name="HighestRateOfSpreadAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="pacw_SpreadTo10YearTreasuryMember" abstract="true" name="SpreadTo10YearTreasuryMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_TermExtensionAndInterestRateReductionMember" abstract="true" name="TermExtensionAndInterestRateReductionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_TrustPreferredSecuritiesTwoThousandSixSeriesFourMember" abstract="true" name="TrustPreferredSecuritiesTwoThousandSixSeriesFourMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_A12HighPassMember" abstract="true" name="A12HighPassMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_OtherRealEstateandForeclosedAssetsTableTextBlock" abstract="false" name="OtherRealEstateandForeclosedAssetsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pacw_OtherRealEstateOwnedNetCoveredandNonCoveredIncludingForeclosedAssetsAbstract" abstract="true" name="OtherRealEstateOwnedNetCoveredandNonCoveredIncludingForeclosedAssetsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pacw_FinancingReceivableRecordedInvestmentTotalPastDue" abstract="false" name="FinancingReceivableRecordedInvestmentTotalPastDue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_CommitmentToContributeCapital" abstract="false" name="CommitmentToContributeCapital" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_LoansandLeasesCommitmentsToExtendCredit" abstract="false" name="LoansandLeasesCommitmentsToExtendCredit" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_FinanceReceivablesLoanRestructuringRefinancingModificationsTableTextBlock" abstract="false" name="FinanceReceivablesLoanRestructuringRefinancingModificationsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pacw_FairValueOptionDisclosureCreditLinkNotesTableTextBlock" abstract="false" name="FairValueOptionDisclosureCreditLinkNotesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pacw_SubordinatedDebtTrustCIIDueSeptember2033Member" abstract="true" name="SubordinatedDebtTrustCIIDueSeptember2033Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_LoanBalanceAmountTypeDomain" abstract="true" name="LoanBalanceAmountTypeDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_StockAndWarrantsTransferredFromLevel2ToLevel1DuringThePeriod" abstract="false" name="StockAndWarrantsTransferredFromLevel2ToLevel1DuringThePeriod" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_ReserveAccountRequiredPercent" abstract="false" name="ReserveAccountRequiredPercent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="pacw_InitialRateSpreadMember" abstract="true" name="InitialRateSpreadMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_ReserveforUnfundedLoanCommitments" abstract="false" name="ReserveforUnfundedLoanCommitments" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_FinanceReceivableLoansByOriginationYearTableTextBlock" abstract="false" name="FinanceReceivableLoansByOriginationYearTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pacw_AggregateUnpaidPrincipalBalanceInExcessOfLessThanFairValue" abstract="false" name="AggregateUnpaidPrincipalBalanceInExcessOfLessThanFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_FinancingReceivableRecordedInvestmentNonaccrualStatusCurrent" abstract="false" name="FinancingReceivableRecordedInvestmentNonaccrualStatusCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_PriorMember" abstract="true" name="PriorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_GainOnSaleOfLoansMember" abstract="true" name="GainOnSaleOfLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_WarrantyIncomeMember" abstract="true" name="WarrantyIncomeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_OthersecuritiesMember" abstract="true" name="OthersecuritiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_FinanceReceivableLoanRestructuringAndRefinancingAmortizedCostsBalanceTableTextBlock" abstract="false" name="FinanceReceivableLoanRestructuringAndRefinancingAmortizedCostsBalanceTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pacw_CurrentMember" abstract="true" name="CurrentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_ResidentialRealEstateConstructionFinancingReceivableMember" abstract="true" name="ResidentialRealEstateConstructionFinancingReceivableMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_LoanRestructuringAndRefinancingConcessionTypeDomain" abstract="true" name="LoanRestructuringAndRefinancingConcessionTypeDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_TermExtensionAndPaymentDelayMember" abstract="true" name="TermExtensionAndPaymentDelayMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_SubordinatedNotesDueMay2031Member" abstract="true" name="SubordinatedNotesDueMay2031Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_FinancingReceivableAllowanceForCreditLossesNetChargeoffs" abstract="false" name="FinancingReceivableAllowanceForCreditLossesNetChargeoffs" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_TermLoanOriginationDateAxis" abstract="true" name="TermLoanOriginationDateAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="pacw_EquityInvestmentsWithoutReadilyDeterminableFairValue" abstract="false" name="EquityInvestmentsWithoutReadilyDeterminableFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_AvailableForSaleInvestmentsClassifiedByContractualMaturityDateTableTextBlock" abstract="false" name="AvailableForSaleInvestmentsClassifiedByContractualMaturityDateTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pacw_LoanExpense" abstract="false" name="LoanExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_CustomerRelatedExpense" abstract="false" name="CustomerRelatedExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_OriginationDate2018Member" abstract="true" name="OriginationDate2018Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_PreferredStockDepositoryShare" abstract="false" name="PreferredStockDepositoryShare" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_LandAndAcquisitionsAndDevelopmentLoans" abstract="false" name="LandAndAcquisitionsAndDevelopmentLoans" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_FairValueEquityTransfersToLevel1Amount" abstract="false" name="FairValueEquityTransfersToLevel1Amount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_FinanceReceivableInvestmentAndInterestIncomeNonaccrualTableTextBlock" abstract="false" name="FinanceReceivableInvestmentAndInterestIncomeNonaccrualTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pacw_ProceedsFromSubordinatedNotesOffering" abstract="false" name="ProceedsFromSubordinatedNotesOffering" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_ProceedsFromMaturitiesAndPaydownsOfSecuritiesHeldToMaturity" abstract="false" name="ProceedsFromMaturitiesAndPaydownsOfSecuritiesHeldToMaturity" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_VentureCapitalLoansMember" abstract="true" name="VentureCapitalLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_LoanContractualInterestChangeFromRateMember" abstract="true" name="LoanContractualInterestChangeFromRateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_ContractWithCustomerReceivableReclassifiedtoOtherAssets" abstract="false" name="ContractWithCustomerReceivableReclassifiedtoOtherAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_TrustPreferredSecuritiesTwoThousandSevenSeriesTwoMember" abstract="true" name="TrustPreferredSecuritiesTwoThousandSevenSeriesTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_OtherCommissionsAndFeesMember" abstract="true" name="OtherCommissionsAndFeesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_ProductandServicesTransferredOverTime" abstract="false" name="ProductandServicesTransferredOverTime" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_DiscountRatesMember" abstract="true" name="DiscountRatesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_SubordinatedDebenturesGross" abstract="false" name="SubordinatedDebenturesGross" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_FederalReserveBankAdvancesBranchofFederalReserveDomain" abstract="true" name="FederalReserveBankAdvancesBranchofFederalReserveDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_OriginationDate2020Member" abstract="true" name="OriginationDate2020Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_TenTo18MonthsMember" abstract="true" name="TenTo18MonthsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_PreferredStockOwnershipInterestPercentage" abstract="false" name="PreferredStockOwnershipInterestPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="pacw_FeesandCommissionsDepositorAccounts1" abstract="false" name="FeesandCommissionsDepositorAccounts1" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_AmericanFinancialExchangeMember" abstract="true" name="AmericanFinancialExchangeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_OCIDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAOCIForAmortizationOfGainLossBeforeTax1" abstract="false" name="OCIDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAOCIForAmortizationOfGainLossBeforeTax1" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_LeaseEquipmentDepreciation" abstract="false" name="LeaseEquipmentDepreciation" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_GovernmentagencyandgovernmentsponsoredenterprisecollateralizedmortgageobligationsMember" abstract="true" name="GovernmentagencyandgovernmentsponsoredenterprisecollateralizedmortgageobligationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_RevolvingConvertedToTermLoanMember" abstract="true" name="RevolvingConvertedToTermLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_NonPCIandPCILoansMember" abstract="true" name="NonPCIandPCILoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_LowestRateOfSpreadDomain" abstract="true" name="LowestRateOfSpreadDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_TrustPreferredSecuritiesTwoThousandFiveSeriesOneMember" abstract="true" name="TrustPreferredSecuritiesTwoThousandFiveSeriesOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_CreditLinkNotesMember" abstract="true" name="CreditLinkNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_UnobservableInputsDomain" abstract="true" name="UnobservableInputsDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_FeesandCommissionsOther1" abstract="false" name="FeesandCommissionsOther1" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_LeaseEquipmentIncomeMember" abstract="true" name="LeaseEquipmentIncomeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_EquityInvestmentsWithReadilyDeterminableFairValue" abstract="false" name="EquityInvestmentsWithReadilyDeterminableFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pacw_SBAassetbackedsecuritiesMember" abstract="true" name="SBAassetbackedsecuritiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pacw_ProvisionForLossesOnForeclosedAssets" abstract="false" name="ProvisionForLossesOnForeclosedAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
