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Employee Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Schedule of Changes in Accumulated Postretirement Benefits Obligations
Changes in Accumulated Postretirement Benefit Obligations:
 
2018
 
2017
Obligation at the Beginning of Year
 
$
1,061

 
$
814

Unrecognized Loss (Gain)
 
74

 
226

 
 
 
 
 
Components of Net Periodic Postretirement Benefit Cost
 
 

 
 

Service Cost
 
69

 
50

Interest Cost
 
34

 
29

 
 
 
 
 
Net Expected Benefit Payments
 
(84
)
 
(58
)
Obligation at End of Year
 
$
1,154

 
$
1,061

Schedule of Components of Postretirement Benefit Expense
Components of Postretirement Benefit Expense:
 
2018
 
2017
 
2016
Service Cost
 
$
69

 
$
50

 
$
41

Interest Cost
 
34

 
29

 
29

Amortization of Unrecognized Net (Gain) Loss
 
32

 
8

 
6

Net Postretirement Benefit Expense
 
135

 
87

 
76

 
 
 
 
 
 
 
Net Gain (Loss) During Period Recognized in Other Comprehensive Income (Loss)
 
41

 
218

 
18

 
 
 
 
 
 
 
Total Recognized in Net Postretirement Benefit Expense and Other Comprehensive Income
 
$
176

 
$
305

 
$
94

Schedule of Assumptions Used to Determine Net Periodic Cost and Benefit Obligations
Assumptions Used to Determine Net Periodic Cost and Benefit Obligations:
 
2018
 
2017
 
2016
Discount Rate
 
3.91
%
 
3.35
%
 
3.72
%
Schedule of Assumption of Health Care Cost Trend Rates at Year-end
Assumed Health Care Cost Trend Rates at Year-end:
 
2018
 
2017
Health Care Cost Trend Rate Assumed for Next Year
 
8.00
%
 
8.00
%
Rate that the Cost Trend Rate Gradually Declines to
 
5.00
%
 
5.00
%
Year that the Rate Reaches the Rate it is Assumed to Remain at
 
2024

 
2023

Schedule of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates
A one-percentage-point change in assumed health care cost trend rates would have the following effects as of December 31, 2018:
 
 
One-Percentage-Point
Increase
 
One-Percentage-Point
Decrease
Effect on Total of Service and Interest Cost
 
$
10

 
$
(9
)
Effect on Postretirement Benefit Obligation
 
$
74

 
$
(66
)
Schedule of Estimated Future Benefits
The following postretirement benefit payments, which reflect expected future service, are expected to be paid:
2019
 
$
92

2020
 
90

2021
 
97

2022
 
91

2023
 
110

2024-2028
 
605