Allowance for loan losses for off balance sheet financial instruments.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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- Definition

Original loan amount to the ESOP from the company to purchase common stock from the company.

+ References

No definition available.

+ Details

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

- Definition

Number of branches operating.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of issued shares purchased by plan.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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Period Type:	duration

- Definition

Percentage of losses absorb by federal deposit insurance corporation.

+ References

No definition available.

+ Details

Name:	hfwa_PercentageOfLossesAbsorbByFederalDepositInsuranceCorporation
Namespace Prefix:	hfwa_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage that FDIC receives from loss recoveries.

+ References

No definition available.

+ Details

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Namespace Prefix:	hfwa_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Loan term for ESOP loan

+ References

No definition available.

+ Details

Name:	hfwa_ReceivablesLoanTerm
Namespace Prefix:	hfwa_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Stock Option Awards Granted

+ References

No definition available.

+ Details

Name:	hfwa_StockOptionAwardsGranted
Namespace Prefix:	hfwa_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Article 9

+ Details

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

- Definition

Fair value as of the balance sheet date of interest rate derivative assets, net of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Reflects the carrying amount of loans and leases for which agreements to acquire or dispose exist.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 825

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6480020&loc=d3e61082-112788

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 825

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6480020&loc=d3e61044-112788

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

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

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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

- Definition

Yield on the receivable, on which interest has been imputed, as calculated from its issuance value or purchase price. The calculated effective interest rate considers factors such as the issued face value or price paid for the receivable, the time period between payments, and the time until maturity [full receipt] of the receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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- Details

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Balance Type:
Period Type:

- Details

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Description of Business, Basis of Presentation and Significant Accounting Policies and Recent Issued Accounting Policies (Details) (USD $)	0 Months Ended	12 Months Ended
	Jan. 31, 1998	Dec. 31, 2014 Segment	Dec. 31, 2013	Dec. 31, 2012	May 01, 2014	Jan. 31, 1998
Business Description and Basis of Presentation [Line Items]
Allowance for off-balance sheet financial instruments		$ 170,000	$ 110,000
Commitments to sell mortgage loans			0
Percentage of losses to be absorbed by the FDIC		80.00%
Percentage of loss recoveries received by FDIC		80.00%
Associated derivative		0	0
Bank owned life insurance		35,176,000us-gaap_BankOwnedLifeInsurance	2,193,000us-gaap_BankOwnedLifeInsurance		32,500,000us-gaap_BankOwnedLifeInsurance
Percentage of issued shares purchased by the Plan	2.00%
ESOP loan to fund the purchase of the Company's common stock	$ 1,300,000					$ 1,300,000
Receivables loan term				15 years
Receivable effective interest rate				8.50%
Stock option awards granted (in shares)		0hfwa_StockOptionAwardsGranted	0hfwa_StockOptionAwardsGranted	0hfwa_StockOptionAwardsGranted
Number of reportable segments		1us-gaap_NumberOfReportableSegments
Buildings and building improvements \| Minimum
Business Description and Basis of Presentation [Line Items]
Estimated useful lives		15 years
Buildings and building improvements \| Maximum
Business Description and Basis of Presentation [Line Items]
Estimated useful lives		39 years
Furniture, fixtures and equipment \| Minimum
Business Description and Basis of Presentation [Line Items]
Estimated useful lives		3 years
Furniture, fixtures and equipment \| Maximum
Business Description and Basis of Presentation [Line Items]
Estimated useful lives		7 years
Heritage Bank
Business Description and Basis of Presentation [Line Items]
Number of branches operating		66