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Deposits (Narrative) (Details) $ in Millions	Dec. 31, 2020 USD ($)
Banking And Thrift Interest [Abstract]
Certificates of deposits more than or equal to $250,000	$ 725

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- Definition

Time deposits250000 more or equal to.

+ References

No definition available.

+ Details

Name:	hwc_TimeDeposits250000MoreOrEqualTo
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_BankingAndThriftInterestAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration