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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
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Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Reserve for unfunded lending commitments | $ 33,468 | $ 29,334 | $ 28,946 | $ 29,907

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- Definition Reserve for unfunded lending commitments. + References No definition available. + Details
Name: | hwc_ReserveForUnfundedLendingCommitments
Namespace Prefix: | hwc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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