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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 111,517 | $ 461,425
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,107 | 7,105
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,089,883 | 1,179,267
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 115,713 | 157,295
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,201,400 | 1,640,692
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 116,820 | 164,400
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 | 5,993 | 21,044
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 8 | 132
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 219,987 | 234,191
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 7,690 | 14,226
Debt Securities, Available-for-sale, Unrealized Loss Position | 225,980 | 255,235
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 7,698 | 14,358
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 | 6,614 | 3,117
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 244 | 143
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 416,996 | 403,767
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 67,418 | 83,568
Debt Securities, Available-for-sale, Unrealized Loss Position | 423,610 | 406,884
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 67,662 | 83,711
Agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 96,890 | 423,600
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 854 | 6,763
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 406,132 | 478,790
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 39,719 | 57,410
Debt Securities, Available-for-sale, Unrealized Loss Position | 503,022 | 902,390
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 40,573 | 64,173
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 | 1,956
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 44
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 6,580 | 8,342
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 170 | 408
Debt Securities, Available-for-sale, Unrealized Loss Position | 6,580 | 10,298
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 170 | 452
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,020 | 11,708
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 23
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 40,188 | 54,177
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 716 | 1,683
Debt Securities, Available-for-sale, Unrealized Loss Position | 42,208 | 65,885
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 717 | $ 1,706

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