Loans Receivable - Nonaccrual Loans (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Nonaccrual Loans
Nonaccrual without ACL	$ 13,344,000		$ 13,344,000		$ 18,890,000
Nonaccrual with ACL	2,166,000		2,166,000		2,086,000
Total Nonaccrual	15,510,000		15,510,000		20,976,000
Interest Income Reversed	(118,000)	$ (176,000)	(172,000)	$ (204,000)
Interest Income Recognized	118,000	6,000	1,012,000	19,000
Mortgage Loans in Process of Foreclosure, Amount	0		0		1,200,000
Loans 90 days or more past due, still accruing interest	0		0		194,000
Nonaccrual
Nonaccrual Loans
Interest Income Recognized	0	0	0	0
Commercial Business
Nonaccrual Loans
Nonaccrual without ACL	5,271,000		5,271,000		4,800,000
Nonaccrual with ACL	2,166,000		2,166,000		2,086,000
Total Nonaccrual	7,437,000		7,437,000		6,886,000
Interest Income Reversed			(151,000)	(22,000)
Interest Income Recognized			592,000	19,000
Commercial Business \| Commercial and industrial
Nonaccrual Loans
Nonaccrual without ACL	2,959,000		2,959,000		853,000
Nonaccrual with ACL	2,166,000		2,166,000		2,086,000
Total Nonaccrual	5,125,000		5,125,000		2,939,000
Interest Income Reversed	(104,000)	(22,000)	(142,000)	(22,000)
Interest Income Recognized	110,000	6,000	111,000	19,000
Commercial Business \| Owner Occupied Commercial Real Estate [Member]
Nonaccrual Loans
Interest Income Reversed			(9,000)	0
Interest Income Recognized			10,000	0
Commercial Business \| Non-owner-occupied CRE
Nonaccrual Loans
Nonaccrual without ACL	2,312,000		2,312,000		3,947,000
Nonaccrual with ACL	0		0		0
Total Nonaccrual	2,312,000		2,312,000		3,947,000
Interest Income Reversed			0	0
Interest Income Recognized			471,000	0
Residential Portfolio Segment [Member]
Nonaccrual Loans
Nonaccrual without ACL	1,338,000		1,338,000		1,196,000
Nonaccrual with ACL	0		0		0
Total Nonaccrual	1,338,000		1,338,000		1,196,000
Interest Income Reversed	(11,000)	0	(16,000)	(28,000)
Interest Income Recognized	0	0	0	0
Real estate construction and land development:
Nonaccrual Loans
Nonaccrual without ACL	6,420,000		6,420,000		12,408,000
Nonaccrual with ACL	0		0		0
Total Nonaccrual	6,420,000		6,420,000		12,408,000
Interest Income Reversed			0	(154,000)
Interest Income Recognized			412,000	0
Real estate construction and land development: \| Commercial and multifamily
Nonaccrual Loans
Nonaccrual without ACL	5,471,000		5,471,000		5,695,000
Nonaccrual with ACL	0		0		0
Total Nonaccrual	5,471,000		5,471,000		5,695,000
Interest Income Reversed	0	(154,000)	0	(154,000)
Interest Income Recognized	0	0	0	0
Real estate construction and land development: \| Residential
Nonaccrual Loans
Nonaccrual without ACL	949,000		949,000		6,713,000
Nonaccrual with ACL	0		0		0
Total Nonaccrual	949,000		949,000		6,713,000
Interest Income Reversed			0	0
Interest Income Recognized			412,000	0
Loans 90 days or more past due, still accruing interest	0		0		194,000
Consumer
Nonaccrual Loans
Nonaccrual without ACL	315,000		315,000		486,000
Nonaccrual with ACL	0		0		0
Total Nonaccrual	315,000		315,000		$ 486,000
Interest Income Reversed	(3,000)	0	(5,000)	0
Interest Income Recognized	$ 8,000	$ 0	$ 8,000	$ 0

Financing Receivable, Excluding Accrued Interest, Nonaccrual, with Allowance

No definition available.

Name:	hfwa_FinancingReceivableExcludingAccruedInterestNonaccrualWithAllowance
Namespace Prefix:	hfwa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(c)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

+ Details

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

- Definition

Amount of writeoff of accrued interest on financing receivable recognized by reversing interest income.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3D
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3D

+ Details

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

- Definition

Amortized cost excluding accrued interest, of financing receivable 90 days or more past due and still accruing. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterest90DaysOrMorePastDueStillAccruing
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amortized cost excluding accrued interest, of financing receivable on nonaccrual status. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7)(e)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

+ Details

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

- Definition

Amortized cost excluding accrued interest, of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

+ Details

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

- Definition

Amount of interest income on financing receivable on nonaccrual status.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

+ Details

Name:	us-gaap_FinancingReceivableNonaccrualInterestIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 35
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-35

+ Details

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

- Details

Name:	us-gaap_FinancialInstrumentPerformanceStatusAxis=hfwa_NonaccrualMember
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=us-gaap_ResidentialPortfolioSegmentMember
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_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hfwa_OnetoFourFamilyRealEstateConstructionMember
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: