Employee Benefits - Actuarial Weighted Average Assumptions Used in Determining Benefit Obligation (Details)		Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Discount rate		4.31%	3.75%
Rate of compensation increase	[1]	0.00%	0.00%

[1] Rate of compensation increase is not applicable for 2018 and 2017 due to the amendment to freeze benefit accruals under the qualified and nonqualified defined benefit pension plans effective March 31, 2016