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Investments - Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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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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