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Employee Benefit Plans - FV of Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Employee Benefit Plans |  |  |
Fair Value | $ 30,084 | $ 25,689 | $ 19,672
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Employee Benefit Plans |  |  |
Fair Value | 29,773 | 25,082 |
Other Observable Inputs (Level 2) |  |  |
Employee Benefit Plans |  |  |
Fair Value | 311 | 607 |
Significant Unobservable Inputs (Level 3) |  |  |
Employee Benefit Plans |  |  |
Fair Value | 0 | 0 |
Cash equivalents |  |  |
Employee Benefit Plans |  |  |
Fair Value | 666 | 1,940 |
Cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Employee Benefit Plans |  |  |
Fair Value | 666 | 1,940 |
Cash equivalents | Other Observable Inputs (Level 2) |  |  |
Employee Benefit Plans |  |  |
Fair Value | 0 | 0 |
Cash equivalents | Significant Unobservable Inputs (Level 3) |  |  |
Employee Benefit Plans |  |  |
Fair Value | 0 | 0 |
U.S government agency obligations |  |  |
Employee Benefit Plans |  |  |
Fair Value | 311 | 300 |
U.S government agency obligations | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Employee Benefit Plans |  |  |
Fair Value | 0 | 0 |
U.S government agency obligations | Other Observable Inputs (Level 2) |  |  |
Employee Benefit Plans |  |  |
Fair Value | 311 | 300 |
U.S government agency obligations | Significant Unobservable Inputs (Level 3) |  |  |
Employee Benefit Plans |  |  |
Fair Value | 0 | 0 |
Corporate bonds |  |  |
Employee Benefit Plans |  |  |
Fair Value |  | 307 |
Corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Employee Benefit Plans |  |  |
Fair Value |  | 0 |
Corporate bonds | Other Observable Inputs (Level 2) |  |  |
Employee Benefit Plans |  |  |
Fair Value |  | 307 |
Corporate bonds | Significant Unobservable Inputs (Level 3) |  |  |
Employee Benefit Plans |  |  |
Fair Value |  | 0 |
Equity securities: |  |  |
Employee Benefit Plans |  |  |
Fair Value | 1,473 | 1,436 |
Equity securities: | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Employee Benefit Plans |  |  |
Fair Value | 1,473 | 1,436 |
Equity securities: | Other Observable Inputs (Level 2) |  |  |
Employee Benefit Plans |  |  |
Fair Value | 0 | 0 |
Equity securities: | Significant Unobservable Inputs (Level 3) |  |  |
Employee Benefit Plans |  |  |
Fair Value | 0 | 0 |
Mutual Fund |  |  |
Employee Benefit Plans |  |  |
Fair Value | 27,634 | 21,706 |
Mutual Fund | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Employee Benefit Plans |  |  |
Fair Value | 27,634 | 21,706 |
Mutual Fund | Other Observable Inputs (Level 2) |  |  |
Employee Benefit Plans |  |  |
Fair Value | 0 | 0 |
Mutual Fund | Significant Unobservable Inputs (Level 3) |  |  |
Employee Benefit Plans |  |  |
Fair Value | $ 0 | $ 0 |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + 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 (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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