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Employee Benefit Plan - Components of Net Periodic Benefit (Income) Cost (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Pension Benefits    
Components of net periodic benefit cost    
Service cost $ 0 $ 0
Interest cost 591 607
Expected return on plan assets (1,417) (1,267)
Amortization of net retirement plan actuarial loss 267 252
Amortization of net retirement plan prior service (credit) cost (3) (3)
Net periodic benefit (income) cost (562) (411)
Life and Health    
Components of net periodic benefit cost    
Service cost 53 68
Interest cost 65 71
Expected return on plan assets 0 0
Amortization of net retirement plan actuarial loss 15 4
Amortization of net retirement plan prior service (credit) cost (15) 4
Net periodic benefit (income) cost 118 147
SERP Benefits    
Components of net periodic benefit cost    
Service cost 45 54
Interest cost 206 209
Expected return on plan assets 0 0
Amortization of net retirement plan actuarial loss 135 101
Amortization of net retirement plan prior service (credit) cost 22 22
Net periodic benefit (income) cost $ 408 $ 386