XML 85 R74.htm IDEA: XBRL DOCUMENT
v3.21.2

Fair Value Measurements (Narrative) (Details) - Recurring [Member] | Sep. 30, 2021 shares
--- | ---
Visa Inc [Member] |
Fair Value of Financial Instruments, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Number of shares of Visa Class B common stock | 192,163
Investment Securities [Member] | Minimum [Member] |
Fair Value of Financial Instruments, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Targeted duration | 2 years
Investment Securities [Member] | Maximum [Member] |
Fair Value of Financial Instruments, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Targeted duration | 5 years 6 months

X
- Definition Number of Shares With Derivative Contract + References No definition available. + Details
Name: | hwc_NumberOfSharesWithDerivativeContract
Namespace Prefix: | hwc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period between issuance and maturity of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=hwc_VisaIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_SecuritiesAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |