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Employee Benefit Plan - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Pension Benefits        
Components of net periodic benefit cost        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 593 734 1,778 2,202
Expected return on plan assets (1,354) (1,233) (4,062) (3,699)
Amortization of net retirement plan actuarial loss 353 333 1,058 1,000
Amortization of net retirement plan prior service (credit) cost (2) (3) (7) (8)
Net periodic benefit (income) cost (410) (169) (1,233) (505)
Life and Health        
Components of net periodic benefit cost        
Service cost 43 40 129 120
Interest cost 61 72 183 217
Expected return on plan assets 0 0 0 0
Amortization of net retirement plan actuarial loss 39 0 116 0
Amortization of net retirement plan prior service (credit) cost (15) (15) (45) (46)
Net periodic benefit (income) cost 128 97 383 291
SERP Benefits        
Components of net periodic benefit cost        
Service cost 54 38 161 115
Interest cost 228 228 685 684
Expected return on plan assets 0 0 0 0
Amortization of net retirement plan actuarial loss 200 78 600 232
Amortization of net retirement plan prior service (credit) cost 71 22 214 65
Net periodic benefit (income) cost $ 553 $ 366 $ 1,660 $ 1,096