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Postretirement Benefit Plans - Amounts Recognized in Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Defined Benefit Postretirement Health And Life Coverage |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net prior service cost, pretax | $ 0 | $ 10
Unrecognized actuarial gain (loss) | 38 | 18
Director's Retirement Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net prior service cost, pretax | 0 | 0
Unrecognized actuarial gain (loss) | (214) | (248)
Scottdale Defined Benefit Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Unrecognized actuarial gain (loss) | 581 | 1,030
Riverview Defined Benefit Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Unrecognized actuarial gain (loss) | $ 76 | $ (824)

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References 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://www.xbrl.org/2003/role/disclosureRef -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 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References 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://www.xbrl.org/2003/role/disclosureRef -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 + Details
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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 No definition available. + Details
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- Details
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