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Intangible Assets - Mortgage Servicing Rights (Details) - Mortgage servicing rights (MSRs) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Mortgage Servicing Rights |  |  |
Mortgage loans serviced for others | $ 292,700,000 | $ 271,400,000 | $ 279,900,000
Mortgage loan servicing fees reported as non-interest income | $ 854,000 | $ 778,000 | $ 821,000

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- Definition Represents the carrying amount of loans serviced for others by the reporting entity. + References No definition available. + Details
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Namespace Prefix: | hwbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of contractually specified servicing fee, late fee, and ancillary fee recognized as income for servicing asset and servicing liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122596-111746 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |