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v3.25.2

Investments - Securities In Unrealized Loss Position (Details) $ in Thousands | Jun. 30, 2025 USD ($) security | Dec. 31, 2024 USD ($) security
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Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | $ 912,718 | $ 1,568,486
12 Months or Greater - Fair Value | 2,540,860 | 2,674,209
Total - Fair Value | 3,453,578 | 4,242,695
Less Than 12 Months - Unrealized Losses | (12,881) | (23,848)
12 Months or Greater - Unrealized Losses | (253,859) | (322,308)
Total - Unrealized Losses | $ (266,740) | $ (346,156)
Number of securities in unrealized loss position (in securities) | security | 899 | 1,020
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | $ 109,799 | $ 37,017
12 Months or Greater - Fair Value | 65,219 | 69,959
Total - Fair Value | 175,018 | 106,976
Less Than 12 Months - Unrealized Losses | (109) | (437)
12 Months or Greater - Unrealized Losses | (3,343) | (4,650)
Total - Unrealized Losses | (3,452) | (5,087)
Obligations of U.S. states and political subdivisions |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 258,879 | 409,406
12 Months or Greater - Fair Value | 1,194,583 | 1,195,869
Total - Fair Value | 1,453,462 | 1,605,275
Less Than 12 Months - Unrealized Losses | (8,787) | (5,621)
12 Months or Greater - Unrealized Losses | (152,827) | (187,168)
Total - Unrealized Losses | (161,614) | (192,789)
Corporate debt securities |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 439,548 | 852,752
12 Months or Greater - Fair Value | 948,756 | 1,051,862
Total - Fair Value | 1,388,304 | 1,904,614
Less Than 12 Months - Unrealized Losses | (3,104) | (10,334)
12 Months or Greater - Unrealized Losses | (72,994) | (102,505)
Total - Unrealized Losses | (76,098) | (112,839)
ABS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 6,207 | 20,090
12 Months or Greater - Fair Value | 38,007 | 49,640
Total - Fair Value | 44,214 | 69,730
Less Than 12 Months - Unrealized Losses | (39) | (184)
12 Months or Greater - Unrealized Losses | (657) | (1,050)
Total - Unrealized Losses | (696) | (1,234)
RMBS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 29,666 | 171,654
12 Months or Greater - Fair Value | 189,541 | 151,893
Total - Fair Value | 219,207 | 323,547
Less Than 12 Months - Unrealized Losses | (320) | (5,498)
12 Months or Greater - Unrealized Losses | (20,322) | (20,030)
Total - Unrealized Losses | (20,642) | (25,528)
CMBS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 68,619 | 77,567
12 Months or Greater - Fair Value | 100,770 | 151,188
Total - Fair Value | 169,389 | 228,755
Less Than 12 Months - Unrealized Losses | (522) | (1,774)
12 Months or Greater - Unrealized Losses | (3,213) | (6,216)
Total - Unrealized Losses | (3,735) | (7,990)
Foreign government debt |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 0 | 0
12 Months or Greater - Fair Value | 3,984 | 3,798
Total - Fair Value | 3,984 | 3,798
Less Than 12 Months - Unrealized Losses | 0 | 0
12 Months or Greater - Unrealized Losses | (503) | (689)
Total - Unrealized Losses | $ (503) | $ (689)

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