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Employee Benefit Plans - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Pension Benefits        
Components of net periodic benefit cost        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 327 545 814 1,185
Expected return on plan assets (1,411) (1,352) (2,826) (2,708)
Amortization of net retirement plan actuarial loss 397 355 780 705
Amortization of net retirement plan prior service (credit) cost 0 (2) 0 (5)
Net periodic benefit (income) cost (687) (454) (1,232) (823)
Life and Health        
Components of net periodic benefit cost        
Service cost 42 45 93 86
Interest cost 36 59 90 122
Expected return on plan assets 0 0 0 0
Amortization of net retirement plan actuarial loss 82 52 156 77
Amortization of net retirement plan prior service (credit) cost (15) (15) (30) (30)
Net periodic benefit (income) cost 145 141 309 255
SERP Benefits        
Components of net periodic benefit cost        
Service cost 55 61 115 107
Interest cost 147 217 346 457
Expected return on plan assets 0 0 0 0
Amortization of net retirement plan actuarial loss 233 175 540 400
Amortization of net retirement plan prior service (credit) cost 70 71 141 143
Net periodic benefit (income) cost $ 505 $ 524 $ 1,142 $ 1,107