Retirement Plans, Amounts Recognized in Accumulated Other Comprehensive Income Table (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
RAP
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	$ (884)	$ (1,064)
Net actuarial loss (gain)	27,089	44,919
Amount not yet recognized in net periodic benefit cost, but recognized in accumulated other comprehensive (income) loss	26,204	43,855
Postretirement Plan
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	(308)	(362)
Net actuarial loss (gain)	(301)	(316)
Amount not yet recognized in net periodic benefit cost, but recognized in accumulated other comprehensive (income) loss	$ (609)	$ (678)

Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 10A
-Subparagraph (i-k)
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (j)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant