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Summary of Significant Accounting Policies - Benefit Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of projected benefit obligations	$ 14,645	$ 12,675
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of projected benefit obligations	7,961	6,824
Postretirement Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of projected benefit obligations	3,997	3,573
SERP Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of projected benefit obligations	$ 2,687	$ 2,278

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ 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.

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