Fair Value - Level 3 Assets (Details) - Level 3 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance	$ 37,331	$ 24,368
Included in earnings	(449)	(983)
Included in other comprehensive income (loss)	394	766
Purchases	14,992	12,553
Sales	(6,204)	(3,516)
Transfers into Level 3	34,240	39,272
Transfers out of Level 3	(40,485)	(35,129)
Ending balance	39,819	37,331
Available-for-sale securities
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance	30,357	17,034
Included in earnings	(1,130)	(1,653)
Included in other comprehensive income (loss)	394	766
Purchases	10,242	10,534
Sales	(6,204)	(3,432)
Transfers into Level 3	34,082	38,719
Transfers out of Level 3	(39,987)	(31,611)
Ending balance	$ 27,754	$ 30,357
Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income	Net realized and unrealized investment gains (losses), Net investment income	Net realized and unrealized investment gains (losses), Net investment income
Fair value, asset, recurring basis, unobservable input reconciliation, asset, gain (loss), statement of other comprehensive income or comprehensive income	Change in unrealized holding gains on available-for-sale securities	Change in unrealized holding gains on available-for-sale securities
Available-for-sale securities | Corporate debt securities
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance	$ 6,268	$ 4,506
Included in earnings	(37)	(129)
Included in other comprehensive income (loss)	(48)	126
Purchases	4,773	6,708
Sales	(2,324)	(1,821)
Transfers into Level 3	5,399	8,379
Transfers out of Level 3	(10,092)	(11,501)
Ending balance	3,939	6,268
Available-for-sale securities | Collateralized debt obligations
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance	0
Included in earnings	(4)
Included in other comprehensive income (loss)	0
Purchases	700
Sales	(696)
Transfers into Level 3	0
Transfers out of Level 3	0
Ending balance	0	0
Available-for-sale securities | Commercial mortgage-backed securities
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance	24,089	10,994
Included in earnings	(1,089)	(1,519)
Included in other comprehensive income (loss)	429	664
Purchases	4,769	3,826
Sales	(3,142)	(1,571)
Transfers into Level 3	26,476	30,340
Transfers out of Level 3	(28,511)	(18,645)
Ending balance	23,021	24,089
Available-for-sale securities | Residential mortgage-backed securities
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance	0	1,534
Included in earnings	0	(5)
Included in other comprehensive income (loss)	13	(24)
Purchases	0	0
Sales	(42)	(40)
Transfers into Level 3	2,207	0
Transfers out of Level 3	(1,384)	(1,465)
Ending balance	794	0
Equity securities | Equity securities
Roll forward of level 3 fair value measurements on a recurring basis
Beginning balance	6,974	7,334
Included in earnings	681	670
Included in other comprehensive income (loss)	0	0
Purchases	4,750	2,019
Sales	0	(84)
Transfers into Level 3	158	553
Transfers out of Level 3	(498)	(3,518)
Ending balance	$ 12,065	$ 6,974