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Employee Benefit Plans - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Pension Benefits        
Components of net periodic benefit cost        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 762 814 1,594 1,637
Expected return on plan assets (1,342) (1,195) (2,573) (2,394)
Amortization of net retirement plan actuarial loss 229 274 488 578
Amortization of net retirement plan prior service (credit) cost 0 0 0 0
Net periodic benefit (income) cost (351) (107) (491) (179)
Life and Health        
Components of net periodic benefit cost        
Service cost 6 1 13 16
Interest cost 81 88 171 177
Expected return on plan assets 0 0 0 0
Amortization of net retirement plan actuarial loss (14) (13) (31) (20)
Amortization of net retirement plan prior service (credit) cost (10) (15) (21) (30)
Net periodic benefit (income) cost 63 61 132 143
SERP Benefits        
Components of net periodic benefit cost        
Service cost 17 7 29 21
Interest cost 267 275 565 574
Expected return on plan assets 0 0 0 0
Amortization of net retirement plan actuarial loss 0 0 0 0
Amortization of net retirement plan prior service (credit) cost 57 69 113 139
Net periodic benefit (income) cost $ 341 $ 351 $ 707 $ 734