<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2023"
  xmlns:hwc="http://www.hancockwhitney.com/20231211"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:us-gaap="http://fasb.org/us-gaap/2023"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="hwc-20231211.xsd" xlink:type="simple"/>
    <context id="C_151ee42d-6f91-4bf5-ab11-1651fa08f54f">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000750577</identifier>
        </entity>
        <period>
            <startDate>2023-12-11</startDate>
            <endDate>2023-12-11</endDate>
        </period>
    </context>
    <context id="C_44933a55-6046-4df8-9d22-eff8f07c06e9">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000750577</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">us-gaap:SeniorSubordinatedNotesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-11</startDate>
            <endDate>2023-12-11</endDate>
        </period>
    </context>
    <context id="C_f763ddda-aba8-43c2-baf9-95054d4c2f10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000750577</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">hwc:CommonStockParValueDollarThreePointThreeThreePerShareMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-11</startDate>
            <endDate>2023-12-11</endDate>
        </period>
    </context>
    <dei:EntityCentralIndexKey
      contextRef="C_151ee42d-6f91-4bf5-ab11-1651fa08f54f"
      id="F_6709f06e-ca10-4525-982a-cbeaa8c97aee">0000750577</dei:EntityCentralIndexKey>
    <dei:AmendmentFlag
      contextRef="C_151ee42d-6f91-4bf5-ab11-1651fa08f54f"
      id="F_0a7c1938-4280-42b9-98fd-94e242752436">false</dei:AmendmentFlag>
    <dei:DocumentType
      contextRef="C_151ee42d-6f91-4bf5-ab11-1651fa08f54f"
      id="F_b41fd820-f2f0-4a12-8917-47e463172de4">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate
      contextRef="C_151ee42d-6f91-4bf5-ab11-1651fa08f54f"
      id="F_26cc0089-a8dd-4036-874d-0222d4c2128b">2023-12-11</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName
      contextRef="C_151ee42d-6f91-4bf5-ab11-1651fa08f54f"
      id="F_221c2eba-ac4a-4c31-862c-58d4b60f0829">Hancock Whitney Corporation</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode
      contextRef="C_151ee42d-6f91-4bf5-ab11-1651fa08f54f"
      id="F_be252d61-27f5-4ca1-aacb-f17ef68eb729">MS</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber
      contextRef="C_151ee42d-6f91-4bf5-ab11-1651fa08f54f"
      id="F_81a796ba-73e3-4ae4-9af0-14eb5e807515">001-36872</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber
      contextRef="C_151ee42d-6f91-4bf5-ab11-1651fa08f54f"
      id="F_c86f4420-e648-4b3d-bab0-4ede4ccfb4ce">64-0693170</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1
      contextRef="C_151ee42d-6f91-4bf5-ab11-1651fa08f54f"
      id="F_550133c9-00cf-4765-a6ab-0a21533f055a">Hancock Whitney Plaza</dei:EntityAddressAddressLine1>
    <dei:EntityAddressAddressLine2
      contextRef="C_151ee42d-6f91-4bf5-ab11-1651fa08f54f"
      id="F_6102c950-120c-4d7e-b673-a7867a1d4563">2510 14th Street</dei:EntityAddressAddressLine2>
    <dei:EntityAddressCityOrTown
      contextRef="C_151ee42d-6f91-4bf5-ab11-1651fa08f54f"
      id="F_b60a48be-2fee-466f-acca-e1fc6a4cf7cb">Gulfport</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince
      contextRef="C_151ee42d-6f91-4bf5-ab11-1651fa08f54f"
      id="F_68321af7-3330-42d4-8cea-93aa9c8be4cd">MS</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode
      contextRef="C_151ee42d-6f91-4bf5-ab11-1651fa08f54f"
      id="F_fea21cc3-78c3-4125-b994-93ed0ef83ab1">39501</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode
      contextRef="C_151ee42d-6f91-4bf5-ab11-1651fa08f54f"
      id="F_a8dae8a1-a112-4893-823b-4cd0a1bea052">(228)</dei:CityAreaCode>
    <dei:LocalPhoneNumber
      contextRef="C_151ee42d-6f91-4bf5-ab11-1651fa08f54f"
      id="F_bd097aa9-8634-46da-a55d-e59276e4bc7d">868-4727</dei:LocalPhoneNumber>
    <dei:WrittenCommunications
      contextRef="C_151ee42d-6f91-4bf5-ab11-1651fa08f54f"
      id="F_24c4e4cf-41b1-4b4f-9e5a-63ee4007d061">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial
      contextRef="C_151ee42d-6f91-4bf5-ab11-1651fa08f54f"
      id="F_f02a5602-57c1-4d7e-a89e-244ec3e6d345">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer
      contextRef="C_151ee42d-6f91-4bf5-ab11-1651fa08f54f"
      id="F_af1997e8-d105-4f29-b98a-04b25c633c5b">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer
      contextRef="C_151ee42d-6f91-4bf5-ab11-1651fa08f54f"
      id="F_a2cd94e1-6673-41bd-9011-c4ca6f6cd292">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12bTitle
      contextRef="C_f763ddda-aba8-43c2-baf9-95054d4c2f10"
      id="F_6a7fbde0-d939-4fef-b6ab-69bafeb875c7">COMMON STOCK, $3.33 PAR VALUE</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="C_f763ddda-aba8-43c2-baf9-95054d4c2f10"
      id="F_01bee14a-0151-4494-86ab-09291d9e9201">HWC</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="C_f763ddda-aba8-43c2-baf9-95054d4c2f10"
      id="F_b41057cf-87e4-4c66-a2b6-52129ae82e3b">NASDAQ</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="C_44933a55-6046-4df8-9d22-eff8f07c06e9"
      id="F_9e362858-09dd-416a-aa78-54d7dd8e367c">6.25% SUBORDINATED NOTES</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="C_44933a55-6046-4df8-9d22-eff8f07c06e9"
      id="F_bdb6ca6e-7909-4636-bb22-6d43308b5b35">HWCPZ</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="C_44933a55-6046-4df8-9d22-eff8f07c06e9"
      id="F_80263c9b-a971-4434-b737-11981e3ba6ad">NASDAQ</dei:SecurityExchangeName>
    <dei:EntityEmergingGrowthCompany
      contextRef="C_151ee42d-6f91-4bf5-ab11-1651fa08f54f"
      id="F_a6a4bc36-95d6-4cfb-947a-8e096ce45ba5">false</dei:EntityEmergingGrowthCompany>
</xbrl>
