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Fair Value Measurements (Financial Assets Measured at Fair Value on Nonrecurring Basis) (Details) - Nonrecurring [Member] - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateral-dependent impaired loans | $ 163,781 | $ 170,918
Other real estate owned and foreclosed assets, net | 7,688 | 14,594
Total nonrecurring fair value measurements | 171,469 | 185,512
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateral-dependent impaired loans | 163,781 | 170,918
Total nonrecurring fair value measurements | 163,781 | 170,918
Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other real estate owned and foreclosed assets, net | 7,688 | 14,594
Total nonrecurring fair value measurements | $ 7,688 | $ 14,594

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- Definition Impaired Loans Fair Value Disclosure + References No definition available. + Details
Name: | hwc_ImpairedLoansFairValueDisclosure
Namespace Prefix: | hwc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Real Estate Acquired Through Foreclosure Fair Value Disclosure + References No definition available. + Details
Name: | hwc_RealEstateAcquiredThroughForeclosureFairValueDisclosure
Namespace Prefix: | hwc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
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- 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
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- Details
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- Details
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- Details
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