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Summary of Significant Accounting Policies - Benefit Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Fair value of projected benefit obligations	$ 3,943	$ 3,758
Postretirement medical benefits plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of projected benefit obligations	1,653	1,869
Supplemental executive retirement plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of projected benefit obligations	$ 2,290	$ 1,889

X

- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

+ Details

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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

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- Details

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