Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Available for sale, fair value
Less than 12 Months		$ 233,041
12 Months or More		185,663
Total		418,704
Available for sale, gross unrealized losses
Less than 12 Months		(1,436)
12 Months or More		(15,394)
Total		(16,830)
Held-to-maturity, fair value
Less than 12 Months		1,912
12 Months or More		0
Total		1,912
Held-to-maturity, gross unrealized losses
Less than 12 Months		(48)
12 Months or More		0
Total		(48)
Available-for-sale and held-to-maturity, fair value
Less than 12 Months	$ 929,701	234,953
12 Months or More	163,373	185,663
Total	1,093,074	420,616
Available-for-sale and held-to-maturity, gross unrealized losses
Less than 12 Months	(9,595)	(1,484)
12 Months or More	(16,513)	(15,394)
Total	(26,108)	(16,878)
U.S. government securities
Available for sale, fair value
Less than 12 Months	91,541	349
12 Months or More	707	1,565
Total	92,248	1,914
Available for sale, gross unrealized losses
Less than 12 Months	(769)	(1)
12 Months or More	(5)	(13)
Total	(774)	(14)
Non U.S government securities
Available for sale, fair value
Less than 12 Months	2,671
12 Months or More	0
Total	2,671
Available for sale, gross unrealized losses
Less than 12 Months	(25)
12 Months or More	0
Total	(25)
Corporate securities and miscellaneous
Available for sale, fair value
Less than 12 Months	341,776	67,644
12 Months or More	57,293	63,575
Total	399,069	131,219
Available for sale, gross unrealized losses
Less than 12 Months	(4,883)	(346)
12 Months or More	(3,998)	(2,734)
Total	(8,881)	(3,080)
Municipal securities
Available for sale, fair value
Less than 12 Months	23,170	19,157
12 Months or More	19,570	22,004
Total	42,740	41,161
Available for sale, gross unrealized losses
Less than 12 Months	(296)	(400)
12 Months or More	(1,872)	(1,900)
Total	(2,168)	(2,300)
Residential mortgage-backed securities
Available for sale, fair value
Less than 12 Months	130,908	56,147
12 Months or More	69,744	74,075
Total	200,652	130,222
Available for sale, gross unrealized losses
Less than 12 Months	(1,017)	(262)
12 Months or More	(9,137)	(9,224)
Total	(10,154)	(9,486)
Commercial mortgage-backed securities
Available for sale, fair value
Less than 12 Months	11,391	4,646
12 Months or More	8,276	8,363
Total	19,667	13,009
Available for sale, gross unrealized losses
Less than 12 Months	(21)	(3)
12 Months or More	(594)	(594)
Total	(615)	(597)
Other asset-backed securities
Available for sale, fair value
Less than 12 Months	328,244	85,098
12 Months or More	7,783	16,081
Total	336,027	101,179
Available for sale, gross unrealized losses
Less than 12 Months	(2,584)	(424)
12 Months or More	(907)	(929)
Total	$ (3,491)	(1,353)
Held-to-maturity, fair value
Less than 12 Months		1,912
12 Months or More		0
Total		1,912
Held-to-maturity, gross unrealized losses
Less than 12 Months		(48)
12 Months or More		0
Total		$ (48)

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