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v3.19.3.a.u2

Time Deposits (Narrative) (Details) $ in Billions | Dec. 31, 2019 USD ($)
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration