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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Net Actuarial loss (gain) | $ 398 | $ 1,906 | $ 2,834
Prior Service cost (credit) |  | (27) | (112)
Total | 398 | 1,879 | 2,722
Retirement Plan [Member] |  |  |
Net Actuarial loss (gain) | 3,944 | 1,414 | 1,775
Prior Service cost (credit) | 0 | 0 | 0
Total | 3,944 | 1,414 | 1,775
Other Postretirement Benefits Plan [Member] |  |  |
Net Actuarial loss (gain) | (2,512) | 932 | 1,333
Prior Service cost (credit) | 0 | (27) | (112)
Total | (2,512) | 905 | 1,221
Directors' Plan [Member] |  |  |
Net Actuarial loss (gain) | (1,034) | (440) | (274)
Prior Service cost (credit) | 0 | 0 | 0
Total | $ (1,034) | $ (440) | $ (274)

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