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Employee Benefit Plan - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Pension Benefits    
Components of net periodic benefit cost    
Service cost $ 0 $ 0
Interest cost 803 832
Expected return on plan assets (1,326) (1,232)
Amortization of net retirement plan actuarial loss 202 259
Amortization of net retirement plan prior service (credit) cost 0 0
Net periodic benefit (income) cost (321) (141)
Life and Health    
Components of net periodic benefit cost    
Service cost 5 7
Interest cost 85 90
Expected return on plan assets 0 0
Amortization of net retirement plan actuarial loss (31) (17)
Amortization of net retirement plan prior service (credit) cost (4) (11)
Net periodic benefit (income) cost 55 69
SERP Benefits    
Components of net periodic benefit cost    
Service cost 14 12
Interest cost 290 298
Expected return on plan assets 0 0
Amortization of net retirement plan actuarial loss 0 0
Amortization of net retirement plan prior service (credit) cost 53 56
Net periodic benefit (income) cost $ 357 $ 366