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Employee Benefit Plan - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Pension Plan    
Components of net periodic benefit cost    
Service cost $ 0 $ 0
Interest cost 487 641
Expected return on plan assets (1,415) (1,355)
Amortization of net retirement plan actuarial loss 383 350
Amortization of net retirement plan prior service (credit) cost 0 (3)
Net periodic benefit (income) cost (545) (367)
Life and Health    
Components of net periodic benefit cost    
Service cost 52 41
Interest cost 54 64
Expected return on plan assets 0 0
Amortization of net retirement plan actuarial loss 74 26
Amortization of net retirement plan prior service (credit) cost (15) (15)
Net periodic benefit (income) cost 165 116
SERP Benefits    
Components of net periodic benefit cost    
Service cost 60 46
Interest cost 199 240
Expected return on plan assets 0 0
Amortization of net retirement plan actuarial loss 307 225
Amortization of net retirement plan prior service (credit) cost 71 71
Net periodic benefit (income) cost $ 637 $ 582