Investments - Schedule of Amortized Cost and Fair Value of Fixed maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Marketable Securities [Line Items]
Amortized Cost	$ 1,143,594	$ 894,145
Gross Unrealized Gains	14,690	1,810
Gross Unrealized Losses	(8,686)	(15,966)
Fair Value	1,149,598	879,989
U.S. government and government agency
Marketable Securities [Line Items]
Amortized Cost	91,085	204,205
Gross Unrealized Gains	219	315
Gross Unrealized Losses	(2)	(108)
Fair Value	91,302	204,412
State and municipal
Marketable Securities [Line Items]
Amortized Cost	111,716	73,289
Gross Unrealized Gains	1,090	0
Gross Unrealized Losses	(3,354)	(5,505)
Fair Value	109,452	67,784
Commercial mortgage-backed securities
Marketable Securities [Line Items]
Amortized Cost	126,550	83,029
Gross Unrealized Gains	1,742	349
Gross Unrealized Losses	(697)	(940)
Fair Value	127,595	82,438
Residential mortgage-backed securities
Marketable Securities [Line Items]
Amortized Cost	281,444	197,589
Gross Unrealized Gains	3,489	649
Gross Unrealized Losses	(3,658)	(6,135)
Fair Value	281,275	192,103
Asset-backed securities
Marketable Securities [Line Items]
Amortized Cost	119,317	121,155
Gross Unrealized Gains	916	259
Gross Unrealized Losses	(220)	(837)
Fair Value	120,013	120,577
Corporate
Marketable Securities [Line Items]
Amortized Cost	413,482	214,878
Gross Unrealized Gains	7,234	238
Gross Unrealized Losses	(755)	(2,441)
Fair Value	$ 419,961	$ 212,675

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).

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
-Publisher FASB
-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
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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