Loans and Allowance for Credit Losses (Troubled Debt Restructurings Modified by Portfolio Class) (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022 USD ($) Contract	Jun. 30, 2021 USD ($) Contract	Jun. 30, 2022 USD ($) Contract	Jun. 30, 2021 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts \| Contract	2	4	6	9
Pre-Modification Outstanding Recorded Investment	$ 41	$ 141	$ 224	$ 7,340
Post-Modification Outstanding Recorded Investment	$ 41	$ 164	$ 229	$ 7,363
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| Contract	1	1	3	2
Pre-Modification Outstanding Recorded Investment	$ 38	$ 109	$ 148	$ 319
Post-Modification Outstanding Recorded Investment	$ 38	$ 132	$ 153	$ 342
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| Contract	1	3	3	4
Pre-Modification Outstanding Recorded Investment	$ 3	$ 32	$ 76	$ 86
Post-Modification Outstanding Recorded Investment	$ 3	$ 32	$ 76	$ 86
Total Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| Contract				3
Pre-Modification Outstanding Recorded Investment				$ 6,935
Post-Modification Outstanding Recorded Investment				$ 6,935
Total Commercial And Industrial [Member] \| Commercial Non-Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| Contract				3
Pre-Modification Outstanding Recorded Investment				$ 6,935
Post-Modification Outstanding Recorded Investment				$ 6,935

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.

No definition available.

+ Details

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

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after troubled debt restructuring, of modified financing receivable.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_EquitySecuritiesByIndustryAxis=us-gaap_CommercialAndIndustrialSectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hwc_CommercialNonRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: