Investment Securities - Amortized Costs, Gains and Losses, Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Amortized cost, gross urealized gains and losses, and fair value of debt securities classified as available-for-sale
Total Amortized Cost	$ 289,977	$ 297,149
Gross unrealized gains	2	7
Gross unrealized losses	(56,463)	(46,409)
Available for sale debt securities fair value	233,516	250,747
U.S. Treasury
Amortized cost, gross urealized gains and losses, and fair value of debt securities classified as available-for-sale
Total Amortized Cost	4,908	2,198
Gross unrealized gains	0	0
Gross unrealized losses	(40)	(46)
Available for sale debt securities fair value	4,868	2,152
U.S. government and federal agency obligations
Amortized cost, gross urealized gains and losses, and fair value of debt securities classified as available-for-sale
Total Amortized Cost	446	591
Gross unrealized gains	0	0
Gross unrealized losses	(26)	(32)
Available for sale debt securities fair value	420	559
U.S. government-sponsored enterprises
Amortized cost, gross urealized gains and losses, and fair value of debt securities classified as available-for-sale
Total Amortized Cost	27,499	26,499
Gross unrealized gains	0	0
Gross unrealized losses	(2,637)	(2,722)
Available for sale debt securities fair value	24,862	23,777
Obligations of states and political subdivisions
Amortized cost, gross urealized gains and losses, and fair value of debt securities classified as available-for-sale
Total Amortized Cost	131,697	134,994
Gross unrealized gains	0	0
Gross unrealized losses	(32,762)	(25,554)
Available for sale debt securities fair value	98,935	109,440
Mortgage-backed securities
Amortized cost, gross urealized gains and losses, and fair value of debt securities classified as available-for-sale
Total Amortized Cost	112,116	119,556
Gross unrealized gains	2	7
Gross unrealized losses	(19,375)	(16,864)
Available for sale debt securities fair value	92,743	102,699
Other debt securities
Amortized cost, gross urealized gains and losses, and fair value of debt securities classified as available-for-sale
Total Amortized Cost	11,825	11,825
Gross unrealized gains	0	0
Gross unrealized losses	(1,291)	(882)
Available for sale debt securities fair value	10,534	10,943
Bank issued trust preferred securities
Amortized cost, gross urealized gains and losses, and fair value of debt securities classified as available-for-sale
Total Amortized Cost	1,486	1,486
Gross unrealized gains	0	0
Gross unrealized losses	(332)	(309)
Available for sale debt securities fair value	$ 1,154	$ 1,177

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

+ Details

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

- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on 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/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

+ Details

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

- References

No definition available.

+ Details

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

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, 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/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

+ Details

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

- 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
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest
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_USGovernmentAgenciesDebtSecuritiesMember
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: