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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Reserve for unfunded lending commitments	$ 29,907	$ 3,974

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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