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Investments - Schedule of Securities in Unrealized Loss Position (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 securities, continuous unrealized loss position, less than 12 months, fair value | $ 450,369 | $ 550,105
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | (10,506) | (12,617)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | 1,602,566 | 1,721,039
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | (172,770) | (209,312)
U.S. Government and Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value |  | 3,529
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses |  | (19)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | 5,780 | 5,660
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | (205) | (307)
Foreign Government [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 35,523 | 15,044
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | (713) | (139)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | 71,247 | 83,923
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | (5,366) | (6,067)
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 9,197 | 9,933
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | (412) | (350)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | 98,178 | 99,389
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | (13,565) | (14,536)
Corporates [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 301,840 | 398,232
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | (8,309) | (9,422)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | 917,117 | 1,000,264
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | (82,651) | (106,673)
Residential Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 85,725 | 106,276
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | (993) | (2,605)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | 318,434 | 327,850
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | (57,320) | (63,985)
Commercial Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 5,920 | 2,005
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | (17) | (1)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | 85,058 | 89,876
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | (8,923) | (11,067)
Other Asset-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 12,164 | 15,086
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | (62) | (81)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | 106,752 | 114,077
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | $ (4,740) | $ (6,677)

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