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Employee Benefit Plan - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Pension Benefits        
Components of net periodic benefit cost        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 545 723 1,185 1,468
Expected return on plan assets (1,352) (1,232) (2,708) (2,466)
Amortization of net retirement plan actuarial loss 355 330 705 667
Amortization of net retirement plan prior service (credit) cost (2) (3) (5) (5)
Net periodic benefit (income) cost (454) (182) (823) (336)
Life and Health        
Components of net periodic benefit cost        
Service cost 45 30 86 80
Interest cost 59 72 122 145
Expected return on plan assets 0 0 0 0
Amortization of net retirement plan actuarial loss 52 0 77 0
Amortization of net retirement plan prior service (credit) cost (15) (15) (30) (31)
Net periodic benefit (income) cost 141 87 255 194
SERP Benefits        
Components of net periodic benefit cost        
Service cost 61 39 107 77
Interest cost 217 228 457 456
Expected return on plan assets 0 0 0 0
Amortization of net retirement plan actuarial loss 175 70 400 154
Amortization of net retirement plan prior service (credit) cost 71 22 143 44
Net periodic benefit (income) cost $ 524 $ 359 $ 1,107 $ 731