Noncovered Loans Receivable (TDR Loans, Recorded Investment and Allowance) (Details) (Noncovered Loans, USD $)	Dec. 31, 2014	Dec. 31, 2013
Noncovered Loans
Financing Receivable, Modifications [Line Items]
Performing TDRs, Noncovered TDRs	$ 18,764,000	$ 22,131,000
Nonaccrual TDRs, Noncovered TDRs	5,010,000	2,634,000
Performing TDRs, Allowance for loan losses on noncovered TDRs	1,908,000	2,957,000
Nonaccrual TDRs, Allowance for loan losses on noncovered TDRs	1,033,000	191,000
Unfunded commitments related to credits classified as noncovered TDRs	$ 1,800,000	$ 4,500,000

Allowance for Loan Losses on Financing Receivable Modifications Accruing Recorded Investment

No definition available.

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

- Definition

Allowance for Loan Losses on Financing Receivable Modifications Non Accruing Recorded Investment

+ References

No definition available.

+ Details

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

- Definition

Financing Receivable Modifications Accruing Recorded Investment

+ References

No definition available.

+ Details

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

- Definition

Financing Receivable Modifications Non Accruing Recorded Investment

+ References

No definition available.

+ Details

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

- Details

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

- Definition

Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554

+ Details

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Period Type:	instant