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Employee Benefit Plan - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Pension Plan        
Components of net periodic benefit cost        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 663 643 1,254 1,250
Expected return on plan assets (1,406) (1,256) (2,824) (2,523)
Amortization of net retirement plan actuarial loss 292 286 559 537
Amortization of net retirement plan prior service (credit) cost (3) (3) (5) (5)
Net periodic benefit (income) cost (454) (330) (1,016) (741)
Life and Health        
Components of net periodic benefit cost        
Service cost 53 28 106 96
Interest cost 71 62 135 134
Expected return on plan assets 0 0 0 0
Amortization of net retirement plan actuarial loss 16 13 31 17
Amortization of net retirement plan prior service (credit) cost (15) (35) (31) (31)
Net periodic benefit (income) cost 125 68 241 216
SERP Benefits        
Components of net periodic benefit cost        
Service cost 35 29 80 83
Interest cost 211 217 417 426
Expected return on plan assets 0 0 0 0
Amortization of net retirement plan actuarial loss 135 98 270 199
Amortization of net retirement plan prior service (credit) cost 22 22 44 44
Net periodic benefit (income) cost $ 403 $ 366 $ 811 $ 752