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Investments - Schedule of Amortized Cost and Fair Value of Fixed maturity Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Marketable Securities [Line Items] |  |
Amortized Cost | $ 892,953 | $ 569,013
Gross Unrealized Gains | 8,358 | 1,400
Gross Unrealized Losses | (10,059) | (15,789)
Fair Value | 891,252 | 554,624
U.S. government and government agency |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 309,181 | 252,294
Gross Unrealized Gains | 747 | 579
Gross Unrealized Losses | (54) | (332)
Fair Value | 309,874 | 252,541
State and municipal |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 68,779 | 55,984
Gross Unrealized Gains | 163 | 0
Gross Unrealized Losses | (3,566) | (5,264)
Fair Value | 65,376 | 50,720
Commercial mortgage-backed securities |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 61,453 | 26,573
Gross Unrealized Gains | 1,082 | 29
Gross Unrealized Losses | (680) | (1,166)
Fair Value | 61,855 | 25,436
Residential mortgage-backed securities |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 174,766 | 79,032
Gross Unrealized Gains | 3,473 | 680
Gross Unrealized Losses | (3,769) | (5,010)
Fair Value | 174,470 | 74,702
Asset-backed securities |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 82,743 | 42,964
Gross Unrealized Gains | 732 | 32
Gross Unrealized Losses | (475) | (963)
Fair Value | 83,000 | 42,033
Corporate |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 196,031 | 112,166
Gross Unrealized Gains | 2,161 | 80
Gross Unrealized Losses | (1,515) | (3,054)
Fair Value | $ 196,677 | $ 109,192

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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