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Employee Benefit Plan - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Pension Plan        
Components of net periodic benefit cost        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 627 625 1,881 1,875
Expected return on plan assets (1,412) (1,293) (4,236) (3,816)
Amortization of net retirement plan actuarial loss 280 269 839 806
Amortization of net retirement plan prior service (credit) cost (3) (3) (8) (8)
Net periodic benefit (income) cost (508) (402) (1,524) (1,143)
Life and Health        
Components of net periodic benefit cost        
Service cost 53 48 159 144
Interest cost 68 67 203 201
Expected return on plan assets 0 0 0 0
Amortization of net retirement plan actuarial loss 16 9 47 26
Amortization of net retirement plan prior service (credit) cost (15) (15) (47) (47)
Net periodic benefit (income) cost 122 109 362 324
SERP Benefits        
Components of net periodic benefit cost        
Service cost 40 42 120 125
Interest cost 208 213 625 639
Expected return on plan assets 0 0 0 0
Amortization of net retirement plan actuarial loss 135 100 404 299
Amortization of net retirement plan prior service (credit) cost 22 22 65 65
Net periodic benefit (income) cost $ 405 $ 377 $ 1,214 $ 1,128