Loans Receivable - Loan Modifications (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
Percentage Modified in Period, to Total Loans Receivables	0.41%	0.07%
Loans Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 18,355	$ 3,060
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend	$ 1,500	$ 6,600
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted Average Term Increase from Modification	3 months 25 days	11 months 15 days
Loans Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 18,355	$ 3,035
Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted Average Interest Rate Decrease from Modification		1.00%
Term Extension & Int. Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans Receivable, Excluding Accrued Interest, Modified in Period, Amount		$ 25
Commercial Business
Financing Receivable, Troubled Debt Restructuring [Line Items]
Percentage Modified in Period, to Total Loans Receivables	0.42%	0.09%
Loans Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 14,187	$ 3,035
Commercial Business \| Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted Average Term Increase from Modification	3 months 29 days	11 months 12 days
Loans Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 14,187	$ 3,035
Commercial Business \| Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted Average Interest Rate Decrease from Modification		0.00%
Commercial Business \| Term Extension & Int. Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans Receivable, Excluding Accrued Interest, Modified in Period, Amount		$ 0
Commercial Business \| Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Percentage Modified in Period, to Total Loans Receivables	1.51%	0.04%
Loans Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 11,501	$ 286
Commercial Business \| Commercial and industrial \| Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted Average Term Increase from Modification	3 months 14 days	5 months 8 days
Loans Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 11,501	$ 286
Commercial Business \| Commercial and industrial \| Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted Average Interest Rate Decrease from Modification		0.00%
Commercial Business \| Commercial and industrial \| Term Extension & Int. Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans Receivable, Excluding Accrued Interest, Modified in Period, Amount		$ 0
Commercial Business \| Owner-occupied CRE
Financing Receivable, Troubled Debt Restructuring [Line Items]
Percentage Modified in Period, to Total Loans Receivables		0.00%
Loans Receivable, Excluding Accrued Interest, Modified in Period, Amount		$ 0
Commercial Business \| Owner-occupied CRE \| Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans Receivable, Excluding Accrued Interest, Modified in Period, Amount		0
Commercial Business \| Owner-occupied CRE \| Term Extension & Int. Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans Receivable, Excluding Accrued Interest, Modified in Period, Amount		$ 0
Commercial Business \| Non-owner-occupied CRE
Financing Receivable, Troubled Debt Restructuring [Line Items]
Percentage Modified in Period, to Total Loans Receivables	0.16%	0.17%
Loans Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 2,686	$ 2,749
Commercial Business \| Non-owner-occupied CRE \| Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted Average Term Increase from Modification	6 months	1 year
Loans Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 2,686	$ 2,749
Commercial Business \| Non-owner-occupied CRE \| Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted Average Interest Rate Decrease from Modification		0.00%
Commercial Business \| Non-owner-occupied CRE \| Term Extension & Int. Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans Receivable, Excluding Accrued Interest, Modified in Period, Amount		$ 0
Real estate construction and land development: \| Commercial and multifamily
Financing Receivable, Troubled Debt Restructuring [Line Items]
Percentage Modified in Period, to Total Loans Receivables	1.11%
Loans Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 4,148
Real estate construction and land development: \| Commercial and multifamily \| Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted Average Term Increase from Modification	3 months
Loans Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 4,148
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Percentage Modified in Period, to Total Loans Receivables	0.01%	0.01%
Loans Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 20	$ 25
Consumer \| Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted Average Term Increase from Modification	1 year 2 months 12 days	2 years 1 month 13 days
Loans Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 20	$ 0
Consumer \| Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted Average Interest Rate Decrease from Modification		1.00%
Consumer \| Term Extension & Int. Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans Receivable, Excluding Accrued Interest, Modified in Period, Amount		$ 25

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

+ Details

Name:	us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesPercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 34
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-34

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 33
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-33

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

+ Details

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

- Definition

Percentage of decrease in weighted average contractual interest rate of financing receivable modified for debtor experiencing financial difficulty.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModifiedWeightedAverageInterestRateDecreaseFromModification
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of increase in weighted average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of commitment to lend additional funds to debtor experiencing financial difficulty for which creditor has modified terms of financing receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481746/310-40-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 36
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-36

+ Details

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

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_ContractualInterestRateReductionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityAndInterestRateReductionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hfwa_CommercialAndIndustrialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hfwa_OwnerOccupiedCommercialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hfwa_NonOwnerOccupiedCommercialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=hfwa_RealEstateConstructionAndLandDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hfwa_FiveOrMoreFamilyResidentialAndCommercialPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: