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Retirement Plans (Tables) | 6 Months Ended
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Jun. 30, 2018
Defined Benefit Plan [Abstract] |
Schedule of Defined Benefit Plans Disclosures | The following tables provide the components of net periodic benefit costs for the three and six-month periods ended June 30, 2018 and 2017.
|  |  |  | Select |  |
|  | Employees' |  | Executive |  | Postretirement
|  | Pension |  | Retirement |  | Benefit
|  | Plan |  | Plan |  | Plans
Net Periodic Benefit Cost |  |  |  |  |  |
For the Three Months Ended June 30, 2018: |  |  |  |  |  |
Service Cost 1 |  | $ | 431 |  |  | $ | 196 |  |  | $ | 35 |
Interest Cost 2 |  | 274 |  |  | 54 |  |  | 68 |
Expected Return on Plan Assets 2 |  | (896 | ) |  | — |  |  | — |
Amortization of Prior Service (Credit) Cost 2 |  | (13 | ) |  | 15 |  |  | 53 |
Amortization of Net Loss 2 |  | 64 |  |  | 33 |  |  | 6 |
Net Periodic (Benefit) Cost |  | $ | (140 | ) |  | $ | 298 |  |  | $ | 162 |
Plan Contributions During the Period |  | $ | — |  |  | $ | 117 |  |  | $ | 102 |
For the Three Months Ended June 30, 2017: |  |  |  |  |  |
Service Cost 1 |  | $ | 350 |  |  | $ | 10 |  |  | $ | 37 |
Interest Cost 2 |  | 373 |  |  | 59 |  |  | 63 |
Expected Return on Plan Assets 2 |  | (800 | ) |  | — |  |  | — |
Amortization of Prior Service (Credit) Cost 2 |  | (14 | ) |  | 14 |  |  | (3 | )
Amortization of Net Loss 2 |  | 148 |  |  | 33 |  |  | — |
Net Periodic (Benefit) Cost |  | $ | 57 |  |  | $ | 116 |  |  | $ | 97 |
Plan Contributions During the Period |  | $ | — |  |  | $ | 116 |  |  | $ | 177 |
Net Periodic Benefit Cost |  |  |  |  |  |
For the Six Months Ended June 30, 2018: |  |  |  |  |  |
Service Cost 1 |  | $ | 779 |  |  | $ | 207 |  |  | $ | 68 |
Interest Cost 2 |  | 799 |  |  | 104 |  |  | 167 |
Expected Return on Plan Assets 2 |  | (1,681 | ) |  | — |  |  | — |
Amortization of Prior Service (Credit) Cost 2 |  | (25 | ) |  | 29 |  |  | 50 |
Amortization of Net Loss 2 |  | 97 |  |  | 66 |  |  | — |
Net Periodic (Benefit) Cost |  | $ | (31 | ) |  | $ | 406 |  |  | $ | 285 |
Plan Contributions During the Period |  | $ | — |  |  | $ | 233 |  |  | $ | 119 |
Estimated Future Contributions in the Current Fiscal Year |  | $ | — |  |  | $ | — |  |  | $ | — |
For the Six Months Ended June 30, 2017: |  |  |  |  |  |
Service Cost 1 |  | $ | 700 |  |  | $ | 20 |  |  | $ | 74 |
Interest Cost 2 |  | 723 |  |  | 109 |  |  | 149 |
Expected Return on Plan Assets 2 |  | (1,600 | ) |  | — |  |  | — |
Amortization of Prior Service (Credit) Cost 2 |  | (28 | ) |  | 28 |  |  | (6 | )
Amortization of Net Loss 2 |  | 296 |  |  | 63 |  |  | — |
Net Periodic (Benefit) Cost |  | $ | 91 |  |  | $ | 220 |  |  | $ | 217 |
Plan Contributions During the Period |  | $ | — |  |  | $ | 229 |  |  | $ | 230 |
Footnotes: 1. Included in Salaries and Employee Benefits on the Consolidated Statements of Income 2. Included in Other Operating Expense on the Consolidated Statements of Income

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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