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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

X

- 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

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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

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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
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-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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Amount excluding accrued interest, 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/2009/role/commonPracticeRef
-Topic 326
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-Section 45
-Paragraph 1
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