Regulatory Capital Requirements - Schedule of Capital Ratios (Details)	Dec. 31, 2023	Dec. 31, 2022
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity Tier 1 capital ratio	0.129	0.128
Leverage ratio	0.100	0.097
Tier 1 capital ratio	0.133	0.132
Total capital ratio	0.141	0.140
Capital conservation buffer	0.061	0.060
Heritage Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity Tier 1 capital ratio	0.129	0.129
Leverage ratio	0.098	0.094
Tier 1 capital ratio	0.129	0.129
Total capital ratio	0.138	0.137
Capital conservation buffer	0.058	0.057

Capital conservation buffer percentage calculated as total risk-based capital ratio after deduction of minimum total risk-based capital ratio as defined by regulatory framework.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480696/942-505-50-1

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Ratio of total risk-based capital to risk-weighted assets as defined by regulatory framework.

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Ratio of Common Equity Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework.

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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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480696/942-505-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 505
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-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480696/942-505-50-1

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Ratio of Tier 1 capital to average assets as defined by regulatory framework.

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Ratio of Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework.

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