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Benefit Plans - Defined Benefit Plans - Weighted-average Assumptions Used to Determine Net Periodic Cost (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Supplemental Retirement Plan |  |
Weighted-average Assumption Used to Determine Net Periodic Benefit Cost: |  |
Discount rate | 3.01% | 4.03%
Split-Dollar Life Insurance Benefit Plan |  |
Weighted-average Assumption Used to Determine Net Periodic Benefit Cost: |  |
Discount rate | 3.01% | 4.03%

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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=118255775&loc=d3e1928-114920 + Details
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- References No definition available. + Details
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- Details
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