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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2020 | Jan. 01, 2019 | Jan. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fixed earnings credit given to all new participants in pension and postretirement plans |  |  |  | 3.00% |  |
Minimum annual earnings credit per participant |  |  |  | $ 2,000 | $ 2,000 | $ 2,000
Percentage of bonds with highest yields excluded from calculation of yield curve for pension plan assumptions |  |  |  | 10.00% |  |
Percentage of bonds with lowest yields excluded from calculation of yield curve for pension plan assumptions |  |  |  | 40.00% |  |
Expected long-term return on plan assets | 5.50% | 5.75% | 6.00% |  |  |
Expected long-term return on plan assets in 2020 |  |  |  | 4.55% |  |
Defined Contribution Plan, eligible compensation for deferral in absence of election otherwise (percent) |  |  |  | 4.00% |  |
Defined Contribution Plan, employee benefit plan expense |  |  |  | $ 147,000 | $ 139,000 | $ 139,000
Pension Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Pension plan, decline in discount rate (percent) |  |  |  | 0.50% |  |

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- Definition Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets, Next Fiscal Year + References No definition available. + Details
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- Definition Defined Benefit Plan, Minimum Annual Earnings Credit Per Participant, Amount + References No definition available. + Details
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- Definition Defined Contribution Plan, Standard Enrollment Rate for Annual Contributions Per Employee, Percent + References No definition available. + Details
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- Definition Represents fixed earnings credit on pension plan received by employees who are new participants in the pension plan on or after 1/1/10. + References No definition available. + Details
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- Definition Represents the percentage of bonds with highest yields excluded from calculation of yield curve for pension plan assumptions. + References No definition available. + Details
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- Definition Represents percentage of bonds with lowest yields excluded from calculation of yield curve for pension plan assumptions + References No definition available. + 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=118255775&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=118255775&loc=d3e2919-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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