<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2022"
  xmlns:hwc="http://www.hancockwhitney.com/20230117"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:us-gaap="http://fasb.org/us-gaap/2022"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="hwc-20230117.xsd" xlink:type="simple"/>
    <context id="C_c1aa8b0b-a7ae-4be2-afd7-4e085f2ac94e">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000750577</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">us-gaap:CommonStockMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-17</startDate>
            <endDate>2023-01-17</endDate>
        </period>
    </context>
    <context id="C_232e1e80-811f-4359-9f17-e6e5804fd9b1">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000750577</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">hwc:SixPointTwoFivePercentageSubordinatedNotesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-17</startDate>
            <endDate>2023-01-17</endDate>
        </period>
    </context>
    <context id="C_4f91274b-4bc4-4cc9-9354-9af7db7ac350">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000750577</identifier>
        </entity>
        <period>
            <startDate>2023-01-17</startDate>
            <endDate>2023-01-17</endDate>
        </period>
    </context>
    <dei:AmendmentFlag
      contextRef="C_4f91274b-4bc4-4cc9-9354-9af7db7ac350"
      id="F_21dcb1ea-b90d-47c2-b83b-7334a31618ad">false</dei:AmendmentFlag>
    <dei:EntityCentralIndexKey
      contextRef="C_4f91274b-4bc4-4cc9-9354-9af7db7ac350"
      id="F_f92b9650-8689-454a-99f9-d8aa00c5c59a">0000750577</dei:EntityCentralIndexKey>
    <dei:DocumentType
      contextRef="C_4f91274b-4bc4-4cc9-9354-9af7db7ac350"
      id="F_e9cf8232-dc6f-4136-b6e1-1089a8efb5ab">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate
      contextRef="C_4f91274b-4bc4-4cc9-9354-9af7db7ac350"
      id="F_a89947e9-4e36-4e1a-9a7d-a94abb749633">2023-01-17</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName
      contextRef="C_4f91274b-4bc4-4cc9-9354-9af7db7ac350"
      id="F_348c1d44-9057-43cc-be31-53437c8b3d22">HANCOCK WHITNEY CORPORATION</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode
      contextRef="C_4f91274b-4bc4-4cc9-9354-9af7db7ac350"
      id="F_b223315e-14d0-40da-8a1c-ecb353d8fc52">MS</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber
      contextRef="C_4f91274b-4bc4-4cc9-9354-9af7db7ac350"
      id="F_628daa3a-7f34-4d7e-959d-1e8e742cf67d">001-36872</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber
      contextRef="C_4f91274b-4bc4-4cc9-9354-9af7db7ac350"
      id="F_6c19fca6-7dea-4d08-9cfc-a669040398c7">64-0693170</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1
      contextRef="C_4f91274b-4bc4-4cc9-9354-9af7db7ac350"
      id="F_67cdd757-998e-4125-80d3-68d4696c0560">Hancock Whitney Plaza</dei:EntityAddressAddressLine1>
    <dei:EntityAddressAddressLine2
      contextRef="C_4f91274b-4bc4-4cc9-9354-9af7db7ac350"
      id="F_1dfb4159-ca92-41dc-b0a3-f8b1137e1d0a">2510 14th Street</dei:EntityAddressAddressLine2>
    <dei:EntityAddressCityOrTown
      contextRef="C_4f91274b-4bc4-4cc9-9354-9af7db7ac350"
      id="F_5409c84a-c183-4bdc-b0e1-1ce066164690">Gulfport</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince
      contextRef="C_4f91274b-4bc4-4cc9-9354-9af7db7ac350"
      id="F_b1def90a-21af-4926-bca7-af2bd535e5e0">MS</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode
      contextRef="C_4f91274b-4bc4-4cc9-9354-9af7db7ac350"
      id="F_c6c944a6-875e-41f0-a697-37731090a44c">39501</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode
      contextRef="C_4f91274b-4bc4-4cc9-9354-9af7db7ac350"
      id="F_14764a2e-1e9b-4ef7-9886-8fd76fc2c590">228</dei:CityAreaCode>
    <dei:LocalPhoneNumber
      contextRef="C_4f91274b-4bc4-4cc9-9354-9af7db7ac350"
      id="F_2f1c3618-89aa-474b-b622-08cd91ff931f">868-4000</dei:LocalPhoneNumber>
    <dei:Security12bTitle
      contextRef="C_c1aa8b0b-a7ae-4be2-afd7-4e085f2ac94e"
      id="F_9378bcf4-6aa5-4fbf-940e-f354e7337216">COMMON STOCK, $3.33 PAR VALUE</dei:Security12bTitle>
    <dei:Security12bTitle
      contextRef="C_232e1e80-811f-4359-9f17-e6e5804fd9b1"
      id="F_9ffc6ff5-a82c-4888-8ec3-754c98f8201e">6.25% SUBORDINATED NOTES</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="C_c1aa8b0b-a7ae-4be2-afd7-4e085f2ac94e"
      id="F_b332013a-8842-4d75-adf9-7c8114371476">HWC</dei:TradingSymbol>
    <dei:TradingSymbol
      contextRef="C_232e1e80-811f-4359-9f17-e6e5804fd9b1"
      id="F_0d240298-e51e-4e5e-b2c7-84b52b647d67">HWCPZ</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="C_c1aa8b0b-a7ae-4be2-afd7-4e085f2ac94e"
      id="F_6ab6c49a-bb34-451c-8b26-964d84763dd0">NASDAQ</dei:SecurityExchangeName>
    <dei:SecurityExchangeName
      contextRef="C_232e1e80-811f-4359-9f17-e6e5804fd9b1"
      id="F_14b26e65-ba98-424c-9d33-449a564729fa">NASDAQ</dei:SecurityExchangeName>
    <dei:WrittenCommunications
      contextRef="C_4f91274b-4bc4-4cc9-9354-9af7db7ac350"
      id="F_3ded86f9-71da-48d4-bac6-6ff17c3f2436">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial
      contextRef="C_4f91274b-4bc4-4cc9-9354-9af7db7ac350"
      id="F_e29ea189-b608-4b5f-b556-439ef7ddbc43">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer
      contextRef="C_4f91274b-4bc4-4cc9-9354-9af7db7ac350"
      id="F_c568d57c-7179-4bdd-8367-dc781dc1fcbb">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer
      contextRef="C_4f91274b-4bc4-4cc9-9354-9af7db7ac350"
      id="F_8e696b62-943d-4c4d-84d7-a5176d785fbb">false</dei:PreCommencementIssuerTenderOffer>
    <dei:EntityEmergingGrowthCompany
      contextRef="C_4f91274b-4bc4-4cc9-9354-9af7db7ac350"
      id="F_64f18629-9ddf-4844-9072-dbd8aec75d61">false</dei:EntityEmergingGrowthCompany>
</xbrl>
