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Subsequent Event Subsequent Event	9 Months Ended
	Sep. 30, 2025
Subsequent Events [Abstract]
Subsequent Events	Proposed Merger On September 25, 2025, Heritage entered into a definitive agreement (the "Merger Agreement") with Olympic pursuant to which Olympic will be merged with and into Heritage (the "Olympic Merger"), and immediately thereafter Olympic's bank subsidiary, Kitsap Bank, will be merged with and into Heritage's bank subsidiary, Heritage Bank. Under the terms of the Merger Agreement, Olympic shareholders will receive 45.0 shares of Heritage common stock for each share of Olympic capital stock. Based on the closing price of Heritage common stock of $24.64 on September 24, 2025 the implied deal value was approximately $176.6 million. Because the exchange ratio of 45.0 shares of Heritage common stock for each share of Olympic capital stock is fixed, the value of the merger consideration will fluctuate until closing based on the value of Heritage's stock price. In the event the Merger Agreement is terminated under certain specified circumstances, each party could be required to pay the other party a termination fee of $7.0 million.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/855/tableOfContent

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483399/855-10-50-2

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