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Employee Benefit Plans - Weighed Average Assumptions Used (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Discount Rates |  |  |
Expected long-term return on plan assets | 6.50% | 6.75% | 7.00%
DB Pension Plan |  |  |
Discount Rates |  |  |
Benefit Cost for Plan Year | 2.24% | 3.04% | 4.08%
Benefit Obligation at End of Plan Year | 2.63% | 2.24% | 3.04%
Life and Healthcare Plan |  |  |
Discount Rates |  |  |
Benefit Cost for Plan Year | 2.33% | 3.10% | 4.13%
Benefit Obligation at End of Plan Year | 2.69% | 2.33% | 3.10%
Rate of compensation increase |  |  |
Benefit Cost for Plan Year | 4.00% | 4.00% | 4.00%
Benefit Obligation at End of Plan Year | 4.00% | 4.00% | 4.00%
SERP Plan |  |  |
Discount Rates |  |  |
Benefit Cost for Plan Year | 2.37% | 3.14% | 4.16%
Benefit Obligation at End of Plan Year | 2.71% | 2.37% | 3.14%
Rate of compensation increase |  |  |
Benefit Cost for Plan Year | 5.00% | 5.00% | 5.00%
Benefit Obligation at End of Plan Year | 5.00% | 5.00% | 5.00%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920 + Details
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