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Employee Benefit Plan - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Pension Benefits    
Components of net periodic benefit cost    
Service cost $ 0 $ 0
Interest cost 823 463
Expected return on plan assets (1,199) (1,468)
Amortization of net retirement plan actuarial loss 304 323
Amortization of net retirement plan prior service (credit) cost 0 0
Net periodic benefit (income) cost (72) (682)
Life and Health    
Components of net periodic benefit cost    
Service cost 15 44
Interest cost 89 52
Expected return on plan assets 0 0
Amortization of net retirement plan actuarial loss (7) 52
Amortization of net retirement plan prior service (credit) cost (15) (15)
Net periodic benefit (income) cost 82 133
SERP Benefits    
Components of net periodic benefit cost    
Service cost 14 52
Interest cost 299 201
Expected return on plan assets 0 0
Amortization of net retirement plan actuarial loss 0 240
Amortization of net retirement plan prior service (credit) cost 70 71
Net periodic benefit (income) cost $ 383 $ 564