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Commitments and Contingencies - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($)
Other Commitments [Line Items] |
Loss contingency accrual | $ 1.5
Minimum |
Other Commitments [Line Items] |
Remaining term of conditional commitment | 1 month
Maximum |
Other Commitments [Line Items] |
Remaining term of conditional commitment | 5 years

X
- Definition Represents the remaining term of conditional commitment. + References No definition available. + Details
Name: | hwbk_RemainingTermOfConditionalCommitment
Namespace Prefix: | hwbk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
Name: | us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |