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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Pension Benefits        
Components of net periodic benefit cost        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 734 627 2,202 1,881
Expected return on plan assets (1,233) (1,412) (3,699) (4,236)
Amortization of net retirement plan actuarial loss 333 280 1,000 839
Amortization of net retirement plan prior service (credit) cost (3) (3) (8) (8)
Net periodic benefit (income) cost (169) (508) (505) (1,524)
Life and Health        
Components of net periodic benefit cost        
Service cost 40 53 120 159
Interest cost 72 68 217 203
Expected return on plan assets 0 0 0 0
Amortization of net retirement plan actuarial loss 0 16 0 47
Amortization of net retirement plan prior service (credit) cost (15) (15) (46) (47)
Net periodic benefit (income) cost 97 122 291 362
SERP Benefits        
Components of net periodic benefit cost        
Service cost 38 40 115 120
Interest cost 228 208 684 625
Expected return on plan assets 0 0 0 0
Amortization of net retirement plan actuarial loss 78 135 232 404
Amortization of net retirement plan prior service (credit) cost 22 22 65 65
Net periodic benefit (income) cost $ 366 $ 405 $ 1,096 $ 1,214