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Investments, Securities with Continuous Unrealized Loss Position (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) Securities | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) Securities | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) Securities
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months | $ 21,441 |  | $ 21,441 |  | $ 11,647
12 months or longer | 1,923 |  | 1,923 |  | 0
Total | 23,364 |  | 23,364 |  | 11,647
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months | 357 |  | 357 |  | 94
12 months or longer | 141 |  | 141 |  | 0
Total | 498 |  | 498 |  | $ 94
Gross OTTI losses charged to realized gains | $ 0 | $ 0 | $ 0 | $ 0 |
Number of securities in unrealized loss position | Securities | 30 |  | 30 |  | 20
U.S. Treasury Securities and Obligations of U.S. Government Agencies and Authorities [Member] |  |  |  |  |
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months | $ 15,275 |  | $ 15,275 |  | $ 7,045
12 months or longer | 0 |  | 0 |  | 0
Total | 15,275 |  | 15,275 |  | 7,045
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months | 195 |  | 195 |  | 26
12 months or longer | 0 |  | 0 |  | 0
Total | 195 |  | 195 |  | 26
Corporate Securities [Member] |  |  |  |  |
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months | 6,166 |  | 6,166 |  | 4,602
12 months or longer | 1,923 |  | 1,923 |  | 0
Total | 8,089 |  | 8,089 |  | 4,602
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months | 162 |  | 162 |  | 68
12 months or longer | 141 |  | 141 |  | 0
Total | $ 303 |  | $ 303 |  | $ 68

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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=124269663&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=123581744&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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