Investments - Schedule of Amortized Cost and Fair Value of Fixed maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Marketable Securities [Line Items]
Amortized Cost	$ 1,524,297	$ 1,364,228
Gross Unrealized Gains	8,800	15,097
Gross Unrealized Losses	(12,747)	(8,319)
Fair Value	1,520,350	1,371,006
U.S. government and government agency
Marketable Securities [Line Items]
Amortized Cost	72,857	80,184
Gross Unrealized Gains	71	184
Gross Unrealized Losses	(116)	0
Fair Value	72,812	80,368
State and municipal
Marketable Securities [Line Items]
Amortized Cost	149,774	131,607
Gross Unrealized Gains	991	713
Gross Unrealized Losses	(3,334)	(3,042)
Fair Value	147,431	129,278
Commercial mortgage-backed securities
Marketable Securities [Line Items]
Amortized Cost	171,250	170,496
Gross Unrealized Gains	1,053	1,688
Gross Unrealized Losses	(1,494)	(862)
Fair Value	170,809	171,322
Residential mortgage-backed securities
Marketable Securities [Line Items]
Amortized Cost	350,505	317,905
Gross Unrealized Gains	2,605	4,071
Gross Unrealized Losses	(4,245)	(3,415)
Fair Value	348,865	318,561
Asset-backed securities
Marketable Securities [Line Items]
Amortized Cost	190,343	168,363
Gross Unrealized Gains	453	931
Gross Unrealized Losses	(663)	(290)
Fair Value	190,133	169,004
Corporate
Marketable Securities [Line Items]
Amortized Cost	589,568	495,673
Gross Unrealized Gains	3,627	7,510
Gross Unrealized Losses	(2,895)	(710)
Fair Value	$ 590,300	$ 502,473

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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