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Other Noninterest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Other Expense Disclosure Nonoperating [Abstract] |  |
Advertising | $ 4,234 | $ 3,080
Corporate value and franchise taxes | 4,296 | 4,042
Printing and supplies | 1,108 | 1,169
Telecommunications and postage | 4,065 | 3,466
Travel expense | 1,111 | 1,098
Entertainment and contributions | 2,447 | 2,708
Tax credit investment amortization | 961 | 1,138
Other retirement expense | (6,122) | (4,105)
Other miscellaneous | 7,469 | 5,691
Total other noninterest expense | $ 19,569 | $ 18,287

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- Definition Ad valorem and franchise taxes. + References No definition available. + Details
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Balance Type: | debit
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- Definition Entertainment and contributions. + References No definition available. + Details
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Namespace Prefix: | hwc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Other Miscellaneous Noninterest Expense + References No definition available. + Details
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- Definition Other Retirement Expense + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Tax Credit Investment Amortization + References No definition available. + Details
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- Definition Travel Expense + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of expense incurred in the period for communication, which is the exchange of information by several methods. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.6) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
Name: | us-gaap_Communication
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- References No definition available. + Details
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- Definition Amount of noninterest expense classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 + Details
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- Definition Amount of expense associated with supplies that were used during the current accounting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 + Details
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