Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands	Jun. 30, 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	$ 940,202	234,953
12 Months or More	134,990	185,663
Total	1,075,192	420,616
Available-for-sale and held-to-maturity, gross unrealized losses
Less than 12 Months	(10,669)	(1,484)
12 Months or More	(14,323)	(15,394)
Total	(24,992)	(16,878)
U.S. government securities
Available for sale, fair value
Less than 12 Months	103,494	349
12 Months or More	0	1,565
Total	103,494	1,914
Available for sale, gross unrealized losses
Less than 12 Months	(1,455)	(1)
12 Months or More	0	(13)
Total	(1,455)	(14)
Non U.S government securities
Available for sale, fair value
Less than 12 Months	2,677
12 Months or More	0
Total	2,677
Available for sale, gross unrealized losses
Less than 12 Months	(44)
12 Months or More	0
Total	(44)
Corporate securities and miscellaneous
Available for sale, fair value
Less than 12 Months	347,196	67,644
12 Months or More	40,383	63,575
Total	387,579	131,219
Available for sale, gross unrealized losses
Less than 12 Months	(4,271)	(346)
12 Months or More	(2,039)	(2,734)
Total	(6,310)	(3,080)
Municipal securities
Available for sale, fair value
Less than 12 Months	21,859	19,157
12 Months or More	19,056	22,004
Total	40,915	41,161
Available for sale, gross unrealized losses
Less than 12 Months	(380)	(400)
12 Months or More	(1,869)	(1,900)
Total	(2,249)	(2,300)
Residential mortgage-backed securities
Available for sale, fair value
Less than 12 Months	151,044	56,147
12 Months or More	61,911	74,075
Total	212,955	130,222
Available for sale, gross unrealized losses
Less than 12 Months	(1,553)	(262)
12 Months or More	(8,943)	(9,224)
Total	(10,496)	(9,486)
Commercial mortgage-backed securities
Available for sale, fair value
Less than 12 Months	21,241	4,646
12 Months or More	5,246	8,363
Total	26,487	13,009
Available for sale, gross unrealized losses
Less than 12 Months	(53)	(3)
12 Months or More	(507)	(594)
Total	(560)	(597)
Other asset-backed securities
Available for sale, fair value
Less than 12 Months	292,691	85,098
12 Months or More	8,394	16,081
Total	301,085	101,179
Available for sale, gross unrealized losses
Less than 12 Months	(2,913)	(424)
12 Months or More	(965)	(929)
Total	$ (3,878)	(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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