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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

X

- 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

X

- 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

X

- 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

X

- Details

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