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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Net Actuarial loss (gain) $ 1,227 $ 552 $ 398
Total 1,227 552 398
Retirement Plan [Member]      
Net Actuarial loss (gain) 4,380 3,978 3,944
Total 4,380 3,978 3,944
Other Postretirement Benefits Plan [Member]      
Net Actuarial loss (gain) (2,074) (2,268) (2,512)
Total (2,074) (2,268) (2,512)
Directors' Plan [Member]      
Net Actuarial loss (gain) (1,079) (1,158) (1,034)
Total $ (1,079) $ (1,158) $ (1,034)