Fair Value Measurements - Schedule of Fair Value, Measure on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended
Jun. 30, 2026	Mar. 31, 2026	Jun. 30, 2025	Mar. 31, 2025
Fixed Maturity Securities, Available-For-Sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 159,450	$ 150,917	$ 83,457	$ 77,920
Total (losses) gains for the period recognized in net investment gains	(161)	(62)	(4,081)	(110)
Purchases	3,458	11,266	8,838	5,164
Sales/Disposals	(5,518)	(334)	(237)	(199)
Issuances			0	0
Settlements			0	0
Transfers into Level 3	643		6,143
Total unrealized gains (loss) for the period recognized in accumulated comprehensive income (loss)	(49)	(2,337)	747	682
Ending balance	157,823	159,450	94,867	83,457
Total gains (losses) for the period recognized in net investment gains (losses) attributable to the change in unrealized gains or losses relating to assets held as of period end			0	0
Mortgage Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	9,088	9,902	16,012	26,490
Total (losses) gains for the period recognized in net investment gains	130	(814)	330	(66)
Purchases	0	0	0	0
Sales/Disposals	0	0	0	0
Issuances			8	5
Settlements			(6,182)	(10,417)
Transfers into Level 3	0		0
Total unrealized gains (loss) for the period recognized in accumulated comprehensive income (loss)	0	0	0	0
Ending balance	$ 9,218	$ 9,088	10,168	16,012
Total gains (losses) for the period recognized in net investment gains (losses) attributable to the change in unrealized gains or losses relating to assets held as of period end			$ 92	$ (84)

Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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