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Investments - Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, at fair value	$ 3,147,647	$ 2,946,126
U.S. Government and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, amortized cost basis	9,816	9,822
Available-for-sale debt securities gross unrealized gain	60	7
Available-for-sale debt securities, gross unrealized loss	(166)	(326)
Available-for-sale debt securities, at fair value	9,710	9,503
Foreign Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, amortized cost basis	176,081	171,033
Available-for-sale debt securities gross unrealized gain	2,241	1,597
Available-for-sale debt securities, gross unrealized loss	(5,356)	(6,206)
Available-for-sale debt securities, at fair value	172,966	166,424
States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, amortized cost basis	137,738	128,359
Available-for-sale debt securities gross unrealized gain	865	96
Available-for-sale debt securities, gross unrealized loss	(11,896)	(14,886)
Available-for-sale debt securities, at fair value	126,707	113,569
Corporates [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, amortized cost basis	1,992,511	1,929,350
Available-for-sale debt securities gross unrealized gain	29,881	11,853
Available-for-sale debt securities, gross unrealized loss	(73,323)	(116,095)
Available-for-sale debt securities, at fair value	1,949,069	1,825,108
Residential Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, amortized cost basis	655,909	552,611
Available-for-sale debt securities gross unrealized gain	4,892	536
Available-for-sale debt securities, gross unrealized loss	(52,484)	(66,590)
Available-for-sale debt securities, at fair value	608,317	486,557
Commercial Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, amortized cost basis	94,236	110,426
Available-for-sale debt securities gross unrealized gain	179	87
Available-for-sale debt securities, gross unrealized loss	(7,477)	(11,068)
Available-for-sale debt securities, at fair value	86,938	99,445
Other Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, amortized cost basis	197,520	250,882
Available-for-sale debt securities gross unrealized gain	874	1,396
Available-for-sale debt securities, gross unrealized loss	(4,454)	(6,758)
Available-for-sale debt securities, at fair value	193,940	245,520
Fixed-Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, amortized cost basis	3,263,811	3,152,483
Available-for-sale debt securities gross unrealized gain	38,992	15,572
Available-for-sale debt securities, gross unrealized loss	(155,156)	(221,929)
Available-for-sale debt securities, at fair value	$ 3,147,647	$ 2,946,126

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