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Pension and Other Postretirement Benefits Plans - The Components of the Net Pension (Benefit) Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Directors' Plan [Member]      
Service cost $ 9 $ 8 $ 11
Interest cost 45 59 48
Amortization of unrecognized loss (154) (161) (29)
Net postretirement benefit expense (100) (94) 30
Current year actuarial loss (gain) (75) (285) (623)
Amortization of actuarial loss (154) (161) (29)
Total recognized in other comprehensive loss 79 (124) (594)
Total recognized in net postretirement expense and other comprehensive loss (21) (218) (564)
Retirement Plan [Member]      
Interest cost 774 812 553
Amortization of unrecognized loss     5
Expected return on plan assets (1,135) (1,109) (1,031)
Net postretirement benefit expense (361) (297) (473)
Current year actuarial loss (gain) 402 34 2,535
Amortization of actuarial loss     5
Total recognized in other comprehensive loss 402 34 2,530
Total recognized in net postretirement expense and other comprehensive loss 41 (263) 2,057
Other Post Retirement Benefit Plan Defined Benefit [Member]      
Service cost 164 158 269
Interest cost 385 381 277
Amortization of unrecognized loss (214) (238) 0
Amortization of past service credit     (27)
Net postretirement benefit expense 335 301 519
Current year actuarial loss (gain) (20) 6 (3,444)
Amortization of actuarial loss 214 238 0
Amortization of prior service credit     27
Total recognized in other comprehensive loss 194 244 (3,417)
Total recognized in net postretirement expense and other comprehensive loss $ 529 $ 545 $ (2,898)