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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Dec. 31, 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 | $ 318,264 | $ 461,425
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,482 | 7,105
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 996,720 | 1,179,267
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 98,641 | 157,295
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,314,984 | 1,640,692
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 100,123 | 164,400
US Government-sponsored Enterprises Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 13,971 | 21,044
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 22 | 132
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 149,230 | 234,191
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5,069 | 14,226
Debt Securities, Available-for-sale, Unrealized Loss Position | 163,201 | 255,235
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 5,091 | 14,358
US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 32,658 | 3,117
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 245 | 143
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 425,879 | 403,767
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 57,864 | 83,568
Debt Securities, Available-for-sale, Unrealized Loss Position | 458,537 | 406,884
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 58,109 | 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 | 266,639 | 423,600
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,215 | 6,763
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 377,787 | 478,790
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 35,115 | 57,410
Debt Securities, Available-for-sale, Unrealized Loss Position | 644,426 | 902,390
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 36,330 | 64,173
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 4,996 | 11,708
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 23
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 40,418 | 54,177
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 499 | 1,683
Debt Securities, Available-for-sale, Unrealized Loss Position | 45,414 | 65,885
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 499 | 1,706
Corporate Debt Securities [Member] |  |
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 | 3,406 | 8,342
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 94 | 408
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,406 | 10,298
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 94 | $ 452

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