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Securities- Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 1,034,351 | $ 1,021,511
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 7,651 | 14,349
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,212,316 | 2,243,962
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 255,111 | 243,875
Total investments with an unrealized loss, fair value | 3,246,667 | 3,265,473
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 262,762 | 258,224
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 669,265 | 693,621
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3,780 | 11,651
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 130,101 | 192,500
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 599 | 2,929
Total investments with an unrealized loss, fair value | 799,366 | 886,121
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 4,379 | 14,580
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 | 1,428 | 14,989
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 13 | 11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 286,532 | 247,648
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 27,463 | 21,866
Total investments with an unrealized loss, fair value | 287,960 | 262,637
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 27,476 | 21,877
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 43,474 | 72,907
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 615 | 1,518
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 799,688 | 828,251
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 125,556 | 123,499
Total investments with an unrealized loss, fair value | 843,162 | 901,158
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 126,171 | 125,017
State and municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 254,269 | 185,108
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,053 | 908
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 500,627 | 449,212
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 51,940 | 44,200
Total investments with an unrealized loss, fair value | 754,896 | 634,320
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 53,993 | 45,108
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 39,732 | 42,207
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 91 | 254
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 120,109 | 122,469
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 8,802 | 10,026
Total investments with an unrealized loss, fair value | 159,841 | 164,676
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 8,893 | 10,280
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 26,183 | 12,679
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,099 | 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 375,259 | 403,882
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 40,751 | 41,355
Total investments with an unrealized loss, fair value | 401,442 | 416,561
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | $ 41,850 | $ 41,362

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