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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 47,210 | $ 127,160
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 281 | 714
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,269,984 | 1,326,392
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 127,328 | 151,750
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,317,194 | 1,453,552
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 127,609 | 152,464
Obligations of U.S. Government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 999 | 25,886
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 85
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 250,613 | 247,027
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 12,495 | 20,283
Debt Securities, Available-for-sale, Unrealized Loss Position | 251,612 | 272,913
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 12,496 | 20,368
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 3,338 | 1,168
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 100 | 163
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 418,471 | 428,171
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 69,497 | 68,604
Debt Securities, Available-for-sale, Unrealized Loss Position | 421,809 | 429,339
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 69,597 | 68,767
Agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 42,873 | 58,249
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 180 | 417
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 509,144 | 540,032
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 43,527 | 58,666
Debt Securities, Available-for-sale, Unrealized Loss Position | 552,017 | 598,281
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 43,707 | 59,083
U.S. Treasury bills |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 8,130 | 7,574
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 620 | 1,176
Debt Securities, Available-for-sale, Unrealized Loss Position | 8,130 | 7,574
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 620 | 1,176
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 41,857
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 49
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 83,626 | 103,588
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,189 | 3,021
Debt Securities, Available-for-sale, Unrealized Loss Position | 83,626 | 145,445
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 1,189 | $ 3,070

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