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Other Assets (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Other Assets [Abstract] |  |
Unamortized portion of investments in affordable housing limited partnerships | $ 37.5 | $ 37.5

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- Definition Investments in low income housing tax credit entities. + References No definition available. + Details
Name: | hwc_InvestmentsInLowIncomeHousingTaxCreditEntities
Namespace Prefix: | hwc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_OtherAssetsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration