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Other Noninterest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Other Expense Disclosure Nonoperating [Abstract] |  |
Advertising | $ 3,080 | $ 2,526
Corporate value and franchise taxes | 4,042 | 3,440
Printing and supplies | 1,169 | 1,286
Telecommunications and postage | 3,466 | 3,850
Travel expense | 1,098 | 1,066
Entertainment and contributions | 2,708 | 2,518
Tax credit investment amortization | 1,138 | 874
Other retirement expense | (4,105) | (4,463)
Other miscellaneous | 5,691 | 5,684
Total other noninterest expense | $ 18,287 | $ 16,781

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- Definition Ad valorem and franchise taxes. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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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
Period Type: | duration

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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
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.6) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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Balance Type: | debit
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Amount of expense associated with supplies that were used during the current accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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