Loans Modified as Troubled Debt Restructurings [Abstract]

No definition available.

Name:	hfwa_LoansModifiedasTroubledDebtRestructuringsAbstract
Namespace Prefix:	hfwa_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after troubled debt restructuring, of modified financing receivable.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

+ Details

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

- Definition

Amount of unfunded portion of contractual agreement to lend funds to borrower for financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18794-111554

+ Details

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

- 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_OnetoFourFamilyRealEstateConstructionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_FinancialInstrumentPerformanceStatusAxis=hfwa_TroubledDebtRestructuredLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=hfwa_ModifiedduringthequarterMember
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:

Loans Receivable - Modified TDRs (Details) $ in Thousands	3 Months Ended		6 Months Ended
Loans Receivable - Modified TDRs (Details) $ in Thousands	Jun. 30, 2021 USD ($) contract	Jun. 30, 2020 USD ($) contract	Jun. 30, 2021 USD ($) contract	Jun. 30, 2020 USD ($) contract	Dec. 31, 2020 USD ($)
Loans Modified as Troubled Debt Restructurings [Abstract]
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend	$ 4,900		$ 4,900		$ 2,600
Commercial Portfolio Segment [Member]
Loans Modified as Troubled Debt Restructurings [Abstract]
Number of Contracts \| contract	20	37	35	44
Outstanding Principal Balance	$ 8,124	$ 13,904	$ 16,792	$ 17,862
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Loans Modified as Troubled Debt Restructurings [Abstract]
Number of Contracts \| contract	18	31	31	35
Outstanding Principal Balance	$ 5,673	$ 11,849	$ 8,713	$ 12,652
Commercial Portfolio Segment [Member] \| Owner Occupied Commercial Real Estate [Member]
Loans Modified as Troubled Debt Restructurings [Abstract]
Number of Contracts \| contract	1	4	2	6
Outstanding Principal Balance	$ 2,200	$ 1,657	$ 5,857	$ 3,067
Commercial Portfolio Segment [Member] \| Non Owner Occupied Commercial Real Estate [Member]
Loans Modified as Troubled Debt Restructurings [Abstract]
Number of Contracts \| contract	1	2	2	3
Outstanding Principal Balance	$ 251	$ 398	$ 2,222	$ 2,143
Real Estate Construction and Land Development \| One-to-four Family Real Estate Construction
Loans Modified as Troubled Debt Restructurings [Abstract]
Number of Contracts \| contract	0	4	0	4
Outstanding Principal Balance	$ 0	$ 1,751	$ 0	$ 1,751
One-to-four Family Real Estate Construction
Loans Modified as Troubled Debt Restructurings [Abstract]
Number of Contracts \| contract			1	0
Outstanding Principal Balance			$ 181	$ 0
Troubled Debt Restructured Loans
Loans Modified as Troubled Debt Restructurings [Abstract]
Number of Contracts \| contract	27	50	58	62
Outstanding Principal Balance	$ 8,713	$ 15,737	$ 17,927	$ 19,786
Troubled Debt Restructured Loans \| Modified during the quarter [Member]
Loans Modified as Troubled Debt Restructurings [Abstract]
Related Specific Valuation Allowance	$ 1,700	$ 1,500	$ 1,700	$ 1,500
Troubled Debt Restructured Loans \| Real Estate Construction and Land Development
Loans Modified as Troubled Debt Restructurings [Abstract]
Number of Contracts \| contract	1	4	1	4
Outstanding Principal Balance	$ 443	$ 1,751	$ 443	$ 1,751
Troubled Debt Restructured Loans \| Real Estate Construction and Land Development \| Five or More Family Residential and Commercial Properties [Member]
Loans Modified as Troubled Debt Restructurings [Abstract]
Number of Contracts \| contract	1	0	1	0
Outstanding Principal Balance	$ 443	$ 0	$ 443	$ 0
Troubled Debt Restructured Loans \| Consumer Portfolio Segment [Member]
Loans Modified as Troubled Debt Restructurings [Abstract]
Number of Contracts \| contract	6	9	21	14
Outstanding Principal Balance	$ 146	$ 82	$ 511	$ 173