Investments - Schedule of Amortized Cost and Fair Value of Fixed maturity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Marketable Securities [Line Items]
Amortized Cost	$ 1,593,861	$ 1,364,228
Gross Unrealized Gains	6,759	15,097
Gross Unrealized Losses	(15,403)	(8,319)
Fair Value	1,585,217	1,371,006
U.S. government and government agency
Marketable Securities [Line Items]
Amortized Cost	48,799	80,184
Gross Unrealized Gains	29	184
Gross Unrealized Losses	(205)	0
Fair Value	48,623	80,368
State and municipal
Marketable Securities [Line Items]
Amortized Cost	172,772	131,607
Gross Unrealized Gains	1,236	713
Gross Unrealized Losses	(3,355)	(3,042)
Fair Value	170,653	129,278
Commercial mortgage-backed securities
Marketable Securities [Line Items]
Amortized Cost	172,792	170,496
Gross Unrealized Gains	631	1,688
Gross Unrealized Losses	(1,944)	(862)
Fair Value	171,479	171,322
Residential mortgage-backed securities
Marketable Securities [Line Items]
Amortized Cost	332,121	317,905
Gross Unrealized Gains	2,126	4,071
Gross Unrealized Losses	(4,777)	(3,415)
Fair Value	329,470	318,561
Asset-backed securities
Marketable Securities [Line Items]
Amortized Cost	214,652	168,363
Gross Unrealized Gains	288	931
Gross Unrealized Losses	(1,346)	(290)
Fair Value	213,594	169,004
Corporate
Marketable Securities [Line Items]
Amortized Cost	652,725	495,673
Gross Unrealized Gains	2,449	7,510
Gross Unrealized Losses	(3,776)	(710)
Fair Value	$ 651,398	$ 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/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
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-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

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