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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023
Other Commitments [Line Items] |  |  |  |
Reserve for unfunded lending commitments | $ 27,874 | $ 24,053 | $ 25,493 | $ 28,894
Federal Deposit Insurance Corporation (FDIC) Special Assessment [Member] |  |  |  |
Other Commitments [Line Items] |  |  |  |
Special assessment expense | $ 29,400 |  |  |

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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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- Definition Special Assessment Expense + References No definition available. + Details
Name: | hwc_SpecialAssessmentExpense
Namespace Prefix: | hwc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_OtherCommitmentsAxis=hwc_FederalDepositInsuranceCorporationFdicSpecialAssessmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |