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Time Deposits (Narrative) (Details) $ in Billions	Dec. 31, 2019 USD ($)
Banking And Thrift [Abstract]
Certificates of deposits more than or equal to $250,000	$ 1.4

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- Definition

Time deposits250000 more or equal to.

+ References

No definition available.

+ Details

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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_BankingAndThriftAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration