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Postretirement Benefit Plans - Weighted-Average Asset Allocation By Investment Category (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021	Nov. 30, 2021	Dec. 31, 2020
Riverview Defined Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value	$ 6,720,000	$ 8,984,000	$ 8,894,000
Percentage of Total Assets	100.00%	100.00%
Riverview Defined Benefit Plan | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value	$ 69,000	$ 133,000
Percentage of Total Assets	1.00%	1.50%
Riverview Defined Benefit Plan | Mutual fund - equity
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value	$ 2,411,000	$ 3,310,000
Percentage of Total Assets	35.90%	36.80%
Riverview Defined Benefit Plan | Common / collective trusts equity
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value	$ 334,000	$ 386,000
Percentage of Total Assets	5.00%	4.30%
Riverview Defined Benefit Plan | Mutual fund / EFTs - fixed income
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value	$ 3,906,000	$ 5,155,000
Percentage of Total Assets	58.10%	57.40%
Scottdale Defined Benefit Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value	$ 4,722,000	$ 5,302,000		$ 4,939,000
Percentage of Total Assets	100.00%	100.00%
Scottdale Defined Benefit Pension Plan | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value	$ 108,000	$ 670,000
Percentage of Total Assets	2.30%	12.60%
Scottdale Defined Benefit Pension Plan | Corporate debt securities
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value	$ 1,841,000	$ 1,411,000
Percentage of Total Assets	39.00%	26.60%
Scottdale Defined Benefit Pension Plan | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value	$ 2,773,000	$ 3,221,000
Percentage of Total Assets	58.70%	60.80%

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ 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 (d)(iv)(01)
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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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-Publisher FASB
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