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Securities- Unrealized Losses (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 | $ 1,186,289 | $ 2,724,439
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 26,244 | 28,284
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3,364,227 | 1,619,124
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 180,316 | 193,330
Total investments with an unrealized loss, fair value | 4,550,516 | 4,343,563
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 206,560 | 221,614
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 226,406 | 1,123,453
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3,684 | 12,223
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,111,559 | 177,930
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 9,241 | 2,054
Total investments with an unrealized loss, fair value | 1,337,965 | 1,301,383
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 12,925 | 14,277
U.S. Government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,251 | 2,347
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4 | 18
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 198,385 | 210,127
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 16,123 | 24,554
Total investments with an unrealized loss, fair value | 199,636 | 212,474
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 16,127 | 24,572
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 530,173 | 990,956
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,955 | 9,211
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 916,298 | 607,659
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 76,515 | 98,356
Total investments with an unrealized loss, fair value | 1,446,471 | 1,598,615
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 78,470 | 107,567
State and municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 411,231 | 446,241
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 20,562 | 5,590
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 991,290 | 348,807
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 67,193 | 41,145
Total investments with an unrealized loss, fair value | 1,402,521 | 795,048
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 87,755 | 46,735
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 195 | 30,369
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 27
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Total investments with an unrealized loss, fair value | 195 | 30,369
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 0 | 27
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 17,033 | 131,073
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 39 | 1,215
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 146,695 | 274,601
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 11,244 | 27,221
Total investments with an unrealized loss, fair value | 163,728 | 405,674
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | $ 11,283 | $ 28,436

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