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Securities- Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 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 | $ 2,152,859 | $ 2,724,439
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 14,726 | 28,284
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,329,380 | 1,619,124
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 207,735 | 193,330
Total investments with an unrealized loss, fair value | 4,482,239 | 4,343,563
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 222,461 | 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 | 957,969 | 1,123,453
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3,061 | 12,223
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 390,891 | 177,930
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5,333 | 2,054
Total investments with an unrealized loss, fair value | 1,348,860 | 1,301,383
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 8,394 | 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 | 2,268 | 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 | 199,013 | 210,127
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 18,582 | 24,554
Total investments with an unrealized loss, fair value | 201,281 | 212,474
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 18,586 | 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 | 805,246 | 990,956
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 6,802 | 9,211
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 599,399 | 607,659
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 86,297 | 98,356
Total investments with an unrealized loss, fair value | 1,404,645 | 1,598,615
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 93,099 | 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 | 328,147 | 446,241
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3,502 | 5,590
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 991,044 | 348,807
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 85,210 | 41,145
Total investments with an unrealized loss, fair value | 1,319,191 | 795,048
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 88,712 | 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 | 0 | 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 | 0 | 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 | 59,229 | 131,073
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,357 | 1,215
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 149,033 | 274,601
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 12,313 | 27,221
Total investments with an unrealized loss, fair value | 208,262 | 405,674
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | $ 13,670 | $ 28,436

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