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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Pension Benefits        
Components of net periodic benefit cost        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 814 529 1,637 992
Expected return on plan assets (1,195) (1,474) (2,394) (2,942)
Amortization of net retirement plan actuarial loss 274 285 578 608
Amortization of net retirement plan prior service (credit) cost 0 0 0 0
Net periodic benefit (income) cost (107) (660) (179) (1,342)
Life and Health        
Components of net periodic benefit cost        
Service cost 1 43 16 87
Interest cost 88 59 177 111
Expected return on plan assets 0 0 0 0
Amortization of net retirement plan actuarial loss (13) 46 (20) 98
Amortization of net retirement plan prior service (credit) cost (15) (15) (30) (30)
Net periodic benefit (income) cost 61 133 143 266
SERP Benefits        
Components of net periodic benefit cost        
Service cost 7   21 39
Service cost   (13)    
Interest cost 275 206 574 407
Expected return on plan assets 0 0 0 0
Amortization of net retirement plan actuarial loss 0 183 0 423
Amortization of net retirement plan prior service (credit) cost 69 68 139 139
Net periodic benefit (income) cost $ 351 $ 444 $ 734 $ 1,008