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Investments - Schedule of Available-for-sale Securities in Continuous Unrealized Loss Position (Details) $ in Thousands | Mar. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than or equal to One Year, Fair value | $ 134,897 | $ 16,603
Less than or equal to One Year, Gross unrealized losses | $ (1,816) | $ (60)
Less than or Equal to One Year, Number of Securities | security | 418 | 49
More Than One Year, Fair value | $ 3,532 | $ 18,929
More than One Year, Gross unrealized loss | $ (1,897) | $ (2,099)
More than One Year, Number of securities | security | 6 | 11
U.S. Treasury securities and obligations of U.S. government authorities and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than or equal to One Year, Fair value | $ 74,713 | $ 15,323
Less than or equal to One Year, Gross unrealized losses | $ (1,054) | $ (58)
Less than or Equal to One Year, Number of Securities | security | 172 | 41
More Than One Year, Fair value | $ 1 | $ 2
More than One Year, Gross unrealized loss | $ 0 | $ 0
More than One Year, Number of securities | security | 2 | 2
Obligations of state and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than or equal to One Year, Fair value | $ 9,082 | $ 379
Less than or equal to One Year, Gross unrealized losses | $ (113) | $ (1)
Less than or Equal to One Year, Number of Securities | security | 42 | 5
More Than One Year, Fair value | $ 0 | $ 0
More than One Year, Gross unrealized loss | $ 0 | $ 0
More than One Year, Number of securities | security | 0 | 0
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than or equal to One Year, Fair value | $ 44,717 | $ 901
Less than or equal to One Year, Gross unrealized losses | $ (575) | $ (1)
Less than or Equal to One Year, Number of Securities | security | 178 | 3
More Than One Year, Fair value | $ 0 | $ 0
More than One Year, Gross unrealized loss | $ 0 | $ 0
More than One Year, Number of securities | security | 0 | 0
Asset backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than or equal to One Year, Fair value | $ 4,517 | $ 0
Less than or equal to One Year, Gross unrealized losses | $ (20) | $ 0
Less than or Equal to One Year, Number of Securities | security | 20 | 0
More Than One Year, Fair value | $ 3,531 | $ 18,927
More than One Year, Gross unrealized loss | $ (1,897) | $ (2,099)
More than One Year, Number of securities | security | 4 | 9
Obligations of foreign governments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than or equal to One Year, Fair value | $ 1,868 |
Less than or equal to One Year, Gross unrealized losses | $ (54) |
Less than or Equal to One Year, Number of Securities | security | 6 |
More Than One Year, Fair value | $ 0 |
More than One Year, Gross unrealized loss | $ 0 |
More than One Year, Number of securities | security | 0 |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 + Details
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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922888-210455 + Details
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