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Pension and Other Postretirement Benefit Plans - Amounts Recognized In AOCI on a Pre-tax Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Net Actuarial loss (gain) | $ 552 | $ 398 | $ 1,906
Prior Service cost (credit) |  |  | (27)
Total | 552 | 398 | 1,879
Retirement Plan [Member] |  |  |
Net Actuarial loss (gain) | 3,978 | 3,944 | 1,414
Prior Service cost (credit) | 0 | 0 | 0
Total | 3,978 | 3,944 | 1,414
Other Postretirement Benefits Plan [Member] |  |  |
Net Actuarial loss (gain) | (2,268) | (2,512) | 932
Prior Service cost (credit) | 0 | 0 | (27)
Total | (2,268) | (2,512) | 905
Directors' Plan [Member] |  |  |
Net Actuarial loss (gain) | (1,158) | (1,034) | (440)
Prior Service cost (credit) | 0 | 0 | 0
Total | $ (1,158) | $ (1,034) | $ (440)

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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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