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Employee Benefit Plan - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Pension Benefits    
Components of net periodic benefit cost    
Service cost $ 0 $ 0
Interest cost 463 487
Expected return on plan assets (1,468) (1,415)
Amortization of net retirement plan actuarial loss 323 383
Amortization of net retirement plan prior service (credit) cost 0 0
Net periodic benefit (income) cost (682) (545)
Life and Health    
Components of net periodic benefit cost    
Service cost 44 52
Interest cost 52 54
Expected return on plan assets 0 0
Amortization of net retirement plan actuarial loss 52 74
Amortization of net retirement plan prior service (credit) cost (15) (15)
Net periodic benefit (income) cost 133 165
SERP Benefits    
Components of net periodic benefit cost    
Service cost 52 60
Interest cost 201 199
Expected return on plan assets 0 0
Amortization of net retirement plan actuarial loss 240 307
Amortization of net retirement plan prior service (credit) cost 71 71
Net periodic benefit (income) cost $ 564 $ 637