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Employee Benefit Plan - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Pension Benefits    
Components of net periodic benefit cost    
Service cost $ 0 $ 0
Interest cost 832 823
Expected return on plan assets (1,232) (1,199)
Amortization of net retirement plan actuarial loss 259 304
Amortization of net retirement plan prior service (credit) cost 0 0
Net periodic benefit (income) cost (141) (72)
Life and Health    
Components of net periodic benefit cost    
Service cost 7 15
Interest cost 90 89
Expected return on plan assets 0 0
Amortization of net retirement plan actuarial loss (17) (7)
Amortization of net retirement plan prior service (credit) cost (11) (15)
Net periodic benefit (income) cost 69 82
SERP Benefits    
Components of net periodic benefit cost    
Service cost 12 14
Interest cost 298 299
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 56 70
Net periodic benefit (income) cost $ 366 $ 383