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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, 2020 USD ($)
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	$ 15.7

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- Definition

Represents the maximum borrowing capacity on a secured basis under agreements with unaffiliated banks.

+ References

No definition available.

+ Details

Name:	hwbk_FederalFundsMaximumBorrowingCapacitySecuredBasis
Namespace Prefix:	hwbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the maximum borrowing capacity on an unsecured basis under agreements with unaffiliated banks.

+ References

No definition available.

+ Details

Name:	hwbk_FederalFundsMaximumBorrowingCapacityUnsecuredBasis
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: