Fair Value Measurements - Mortgage Servicing Rights - Summary (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Assets:
Available for sale debt securities	$ 245,155	$ 310,870
Loans held for sale	913	2,249
Mortgage servicing rights	2,906	2,659
U.S. Treasury
Assets:
Available for sale debt securities	3,506	3,917
U.S. government-sponsored enterprises
Assets:
Available for sale debt securities	23,603	26,372
Obligations of states and political subdivisions
Assets:
Available for sale debt securities	102,156	129,224
Mortgage-backed securities
Assets:
Available for sale debt securities	102,946	136,466
Other debt securities
Assets:
Available for sale debt securities	11,179	12,284
Bank-issued trust preferred securities
Assets:
Available for sale debt securities	1,207	1,288
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Available for sale debt securities	3,506	3,917
Loans held for sale	0	0
Total	56,183	175,700
Liabilities:
Total	1,330,701	1,295,535
Other Observable Inputs (Level 2)
Assets:
Available for sale debt securities	241,649	306,953
Loans held for sale	913	2,249
Total	250,463	317,071
Liabilities:
Total	113,187	121,060
Significant Unobservable Inputs (Level 3)
Assets:
Available for sale debt securities	0	0
Loans held for sale	0	0
Total	1,424,485	1,308,851
Liabilities:
Total	264,548	246,051
Recurring
Assets:
Loans held for sale	913	2,249
Mortgage servicing rights	2,906	2,659
Total	249,067	316,162
Liabilities:
Total	76	26
Recurring \| U.S. Treasury
Assets:
Available for sale debt securities	3,506	3,917
Recurring \| U.S. government and federal agency obligations
Assets:
Available for sale debt securities	558	1,319
Recurring \| U.S. government-sponsored enterprises
Assets:
Available for sale debt securities	23,603	26,372
Recurring \| Obligations of states and political subdivisions
Assets:
Available for sale debt securities	102,156	129,224
Recurring \| Mortgage-backed securities
Assets:
Available for sale debt securities	102,946	136,466
Recurring \| Other debt securities
Assets:
Available for sale debt securities	11,179	12,284
Recurring \| Bank-issued trust preferred securities
Assets:
Available for sale debt securities	1,207	1,288
Recurring \| Equity securities
Assets:
Available for sale debt securities	48	60
Recurring \| Interest rate lock commitments
Assets:
Commitments	10	312
Liabilities:
Interest rate lock commitments	76	26
Recurring \| Forward sale commitments
Assets:
Commitments	35	12
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Loans held for sale	0	0
Mortgage servicing rights	0	0
Total	3,554	3,977
Liabilities:
Total	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. Treasury
Assets:
Available for sale debt securities	3,506	3,917
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. government and federal agency obligations
Assets:
Available for sale debt securities	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. government-sponsored enterprises
Assets:
Available for sale debt securities	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Obligations of states and political subdivisions
Assets:
Available for sale debt securities	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Mortgage-backed securities
Assets:
Available for sale debt securities	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Other debt securities
Assets:
Available for sale debt securities	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Bank-issued trust preferred securities
Assets:
Available for sale debt securities	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Equity securities
Assets:
Available for sale debt securities	48	60
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Interest rate lock commitments
Assets:
Commitments	0	0
Liabilities:
Interest rate lock commitments	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Forward sale commitments
Assets:
Commitments	0	0
Recurring \| Other Observable Inputs (Level 2)
Assets:
Loans held for sale	913	2,249
Mortgage servicing rights	0	0
Total	242,597	309,214
Liabilities:
Total	0	0
Recurring \| Other Observable Inputs (Level 2) \| U.S. Treasury
Assets:
Available for sale debt securities	0	0
Recurring \| Other Observable Inputs (Level 2) \| U.S. government and federal agency obligations
Assets:
Available for sale debt securities	558	1,319
Recurring \| Other Observable Inputs (Level 2) \| U.S. government-sponsored enterprises
Assets:
Available for sale debt securities	23,603	26,372
Recurring \| Other Observable Inputs (Level 2) \| Obligations of states and political subdivisions
Assets:
Available for sale debt securities	102,156	129,224
Recurring \| Other Observable Inputs (Level 2) \| Mortgage-backed securities
Assets:
Available for sale debt securities	102,946	136,466
Recurring \| Other Observable Inputs (Level 2) \| Other debt securities
Assets:
Available for sale debt securities	11,179	12,284
Recurring \| Other Observable Inputs (Level 2) \| Bank-issued trust preferred securities
Assets:
Available for sale debt securities	1,207	1,288
Recurring \| Other Observable Inputs (Level 2) \| Equity securities
Assets:
Available for sale debt securities	0	0
Recurring \| Other Observable Inputs (Level 2) \| Interest rate lock commitments
Assets:
Commitments	0	0
Liabilities:
Interest rate lock commitments	0	0
Recurring \| Other Observable Inputs (Level 2) \| Forward sale commitments
Assets:
Commitments	35	12
Recurring \| Significant Unobservable Inputs (Level 3)
Assets:
Loans held for sale	0	0
Mortgage servicing rights	2,906	2,659
Total	2,916	2,971
Liabilities:
Total	76	26
Recurring \| Significant Unobservable Inputs (Level 3) \| U.S. Treasury
Assets:
Available for sale debt securities	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| U.S. government and federal agency obligations
Assets:
Available for sale debt securities	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| U.S. government-sponsored enterprises
Assets:
Available for sale debt securities	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Obligations of states and political subdivisions
Assets:
Available for sale debt securities	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Mortgage-backed securities
Assets:
Available for sale debt securities	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Other debt securities
Assets:
Available for sale debt securities	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Bank-issued trust preferred securities
Assets:
Available for sale debt securities	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Equity securities
Assets:
Available for sale debt securities	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Interest rate lock commitments
Assets:
Commitments	10	312
Liabilities:
Interest rate lock commitments	76	26
Recurring \| Significant Unobservable Inputs (Level 3) \| Forward sale commitments
Assets:
Commitments	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

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

- Definition

Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 22
-URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

+ Details

Name:	us-gaap_DerivativeAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 22
-URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313

+ Details

Name:	us-gaap_DerivativeLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value of financial and nonfinancial obligations.

+ References

+ Details

Name:	us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

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

- Definition

Amount, before valuation allowance, of financing receivable classified as held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124265262&loc=d3e48678-111004

+ Details

Name:	us-gaap_LoansReceivableHeldForSaleAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=128311188&loc=d3e122625-111746

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

+ Details

Name:	us-gaap_ServicingAssetAtFairValueAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_OtherDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=hwbk_BankIssuedTrustPreferredSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=hwbk_USGovernmentAndFederalAgencyObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_InterestRateLockCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=hwbk_ForwardSaleCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: