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Investments - Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands | Jun. 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 | $ 3,096,708 | $ 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 | 9,817 | 9,822
Available-for-sale debt securities gross unrealized gain | 57 | 7
Available-for-sale debt securities, gross unrealized loss | (205) | (326)
Available-for-sale debt securities, at fair value | 9,669 | 9,503
Foreign Government [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale debt securities, amortized cost basis | 186,815 | 171,033
Available-for-sale debt securities gross unrealized gain | 1,700 | 1,597
Available-for-sale debt securities, gross unrealized loss | (6,079) | (6,206)
Available-for-sale debt securities, at fair value | 182,436 | 166,424
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale debt securities, amortized cost basis | 126,677 | 128,359
Available-for-sale debt securities gross unrealized gain | 100 | 96
Available-for-sale debt securities, gross unrealized loss | (13,977) | (14,886)
Available-for-sale debt securities, at fair value | 112,800 | 113,569
Corporates [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale debt securities, amortized cost basis | 1,990,113 | 1,929,350
Available-for-sale debt securities gross unrealized gain | 19,854 | 11,853
Available-for-sale debt securities, gross unrealized loss | (90,960) | (116,095)
Available-for-sale debt securities, at fair value | 1,919,007 | 1,825,108
Residential Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale debt securities, amortized cost basis | 628,760 | 552,611
Available-for-sale debt securities gross unrealized gain | 2,219 | 536
Available-for-sale debt securities, gross unrealized loss | (58,313) | (66,590)
Available-for-sale debt securities, at fair value | 572,666 | 486,557
Commercial Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale debt securities, amortized cost basis | 106,388 | 110,426
Available-for-sale debt securities gross unrealized gain | 101 | 87
Available-for-sale debt securities, gross unrealized loss | (8,940) | (11,068)
Available-for-sale debt securities, at fair value | 97,549 | 99,445
Other Asset-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale debt securities, amortized cost basis | 206,131 | 250,882
Available-for-sale debt securities gross unrealized gain | 1,252 | 1,396
Available-for-sale debt securities, gross unrealized loss | (4,802) | (6,758)
Available-for-sale debt securities, at fair value | 202,581 | 245,520
Fixed-Maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale debt securities, amortized cost basis | 3,254,701 | 3,152,483
Available-for-sale debt securities gross unrealized gain | 25,283 | 15,572
Available-for-sale debt securities, gross unrealized loss | (183,276) | (221,929)
Available-for-sale debt securities, at fair value | $ 3,096,708 | $ 2,946,126

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