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Federal funds purchased and securities sold under agreements to repurchase - Secured and Unsecured (Details) - Federal funds purchased $ in Millions | Dec. 31, 2019 USD ($)
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Federal funds purchased and securities sold under agreements to repurchase |
Maximum borrowing capacity of federal funds on unsecured basis | $ 50.0
Maximum borrowing capacity of federal funds on secured basis | $ 16.0

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- Definition Represents the maximum borrowing capacity on a secured basis under agreements with unaffiliated banks. + 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 Represents the maximum borrowing capacity on an unsecured basis under agreements with unaffiliated banks. + 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 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_ShortTermDebtLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ShortTermDebtTypeAxis=us-gaap_FederalFundsPurchasedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |