Schedule H, Line 4i – Schedule of Assets (Held At End of Year) (Details) - EBP 008	12 Months Ended
Dec. 31, 2025 USD ($)
EBP, Schedule of Asset Held for Investment [Line Items]
Entity tax identification number	93-0256722
Plan number	008
Total investments	$ 414,761,087
Notes receivable from participants	5,018,405
Asset held for investment	$ 419,779,492
Minimum
EBP, Schedule of Asset Held for Investment [Line Items]
Participant loan interest rate	4.25%
Maximum
EBP, Schedule of Asset Held for Investment [Line Items]
Participant loan interest rate	9.50%
Investment, Identifier [Axis]: American Century Small Cap Value Fund \| Mutual fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	$ 459,205
Investment, Identifier [Axis]: Artisan International Institutional Fund \| Collective trust
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	10,422,766
Investment, Identifier [Axis]: BlackRock Equity Index Fund M \| Collective trust
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	46,977,192
Investment, Identifier [Axis]: BlackRock Extended Market K \| Collective trust
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	9,901,582
Investment, Identifier [Axis]: BlackRock LifePath Index 2030 Fund \| Collective trust
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	36,321,589
Investment, Identifier [Axis]: BlackRock LifePath Index 2035 Fund \| Collective trust
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	48,520,561
Investment, Identifier [Axis]: BlackRock LifePath Index 2040 Fund \| Collective trust
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	33,313,581
Investment, Identifier [Axis]: BlackRock LifePath Index 2045 Fund \| Collective trust
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	37,106,003
Investment, Identifier [Axis]: BlackRock LifePath Index 2050 Fund \| Collective trust
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	30,271,813
Investment, Identifier [Axis]: BlackRock LifePath Index 2055 Fund \| Collective trust
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	19,359,878
Investment, Identifier [Axis]: BlackRock LifePath Index 2060 Fund \| Collective trust
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	7,503,274
Investment, Identifier [Axis]: BlackRock LifePath Index 2065 Fund \| Collective trust
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	1,955,977
Investment, Identifier [Axis]: BlackRock LifePath Index Retirement Fund \| Collective trust
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	39,181,151
Investment, Identifier [Axis]: BlackRock MSCI ACWI ex-U.S. Index Fund M \| Collective trust
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	9,940,728
Investment, Identifier [Axis]: BlackRock US Debt Index NL W \| Collective trust
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	9,830,424
Investment, Identifier [Axis]: BrokerageLink \| Self-directed brokerage accounts
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	10,630,109
Investment, Identifier [Axis]: Fidelity Blue Chip Growth K6 Fund \| Mutual fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	17,917,350
Investment, Identifier [Axis]: Fidelity Total Bond K6 Fund \| Mutual fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	3,184,294
Investment, Identifier [Axis]: JPMorgan Equity Income Fund \| Mutual fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	6,033,171
Investment, Identifier [Axis]: NW Natural Holding Company Unitized Stock \| Common stock
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	12,236,653
Investment, Identifier [Axis]: T. Rowe Price Small-Cap Stock Fund \| Mutual fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	12,852,452
Investment, Identifier [Axis]: T. Rowe Price US Treasury MM Trust B \| Collective trust
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	$ 10,841,334

The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2

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- Definition

Amount of total assets in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, current value of investment, participant loan, and plan interest in master trust.

+ References

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- Definition

Current value of investment, excluding plan interest in master trust, in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, derivative, investment measured at net asset value per share as practical expedient, and insurance contract.

+ References

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- Definition

Amount, after deemed distribution, of participant loan in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

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- Definition

Interest rate on participant loan in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

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- Definition

Plan number of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), in three-digit numeric format.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule I))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule II))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (1)
-Publisher DOL-EBSA

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule III))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (3)
-Publisher DOL-EBSA

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (4)
-Publisher DOL-EBSA

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 6
-Paragraph d
-Subparagraph (1)
-Publisher DOL-EBSA

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 6
-Paragraph d
-Subparagraph (2)
-Publisher DOL-EBSA

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (2)
-Publisher DOL-EBSA

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- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (1)(i)(D)
-Publisher DOL-EBSA

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule I))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (1)(i)(A)
-Publisher DOL-EBSA

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (1)(i)(C)
-Publisher DOL-EBSA

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (1)(i)(B)
-Publisher DOL-EBSA

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