XML 138 R123.htm IDEA: XBRL DOCUMENT
v3.20.4

Stockholders' Equity - Issuance of Common Stock (Details) - USD ($) | Jul. 02, 2018 | Jan. 16, 2018 | Dec. 31, 2018 | Jun. 29, 2018 | Jan. 12, 2018
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Share price (in usd per share) |  |  | $ 31.80 |  |
Premier Merger |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of shares issued | 2,848,579 |  |  |  |
Share price (in usd per share) | $ 34.85 |  |  | $ 34.85 |
Fair value of shares issued | $ 99,300,000 |  |  |  |
Puget Sound Merger |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of shares issued |  | 4,112,258 |  |  |
Share price (in usd per share) |  | $ 31.80 |  |  | $ 31.80
Fair value of shares issued |  | $ 130,800,000 |  |  |

X
- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 + Details
Name: | us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 + Details
Name: | us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionSharePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=hfwa_PremierCommercialBancorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=hfwa_PugetSoundBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |