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Retirement Plans - Schedule of Net Pension Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Components of net pension cost        
Service cost - benefits earned during the year $ 174 $ 236 $ 521 $ 710
Interest costs on projected benefit obligations 388 370 1,164 1,108
Expected return on plan assets (585) (590) (1,755) (1,769)
Expected administrative expenses 36 28 109 82
Amortization of unrecognized net gain (319) (173) (957) (518)
Net periodic pension income $ (306) $ (129) $ (919) $ (387)