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Employee Benefit Plans - Salary Continuation Plan (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Retirement Benefits [Abstract] |  |  |
Obligation, at the beginning of the year | $ 3,835 | $ 4,162 | $ 4,334
Benefits paid | (450) | (536) | (460)
Expenses incurred | 191 | 209 | 288
Obligation, at the end of the year | $ 3,576 | $ 3,835 | $ 4,162

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- Definition Salary Continuation Plan + References No definition available. + Details
Name: | hfwa_SalaryContinuationPlan
Namespace Prefix: | hfwa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Salary Continuation Plan Benefit Paid + References No definition available. + Details
Name: | hfwa_SalaryContinuationPlanBenefitPaid
Namespace Prefix: | hfwa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Salary Continuation Plan Expense + References No definition available. + Details
Name: | hfwa_SalaryContinuationPlanExpense
Namespace Prefix: | hfwa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration