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Securities- Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 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 | $ 2,266,283 | $ 1,021,511
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 15,899 | 14,349
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,585,296 | 2,243,962
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 197,897 | 243,875
Total investments with an unrealized loss, fair value | 3,851,579 | 3,265,473
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 213,796 | 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 | 1,163,421 | 693,621
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 5,851 | 11,651
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 181,953 | 192,500
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,026 | 2,929
Total investments with an unrealized loss, fair value | 1,345,374 | 886,121
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 6,877 | 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 | 1,275 | 14,989
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 10 | 11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 236,960 | 247,648
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 23,870 | 21,866
Total investments with an unrealized loss, fair value | 238,235 | 262,637
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 23,880 | 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 | 661,753 | 72,907
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 7,350 | 1,518
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 605,683 | 828,251
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 104,467 | 123,499
Total investments with an unrealized loss, fair value | 1,267,436 | 901,158
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 111,817 | 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 | 237,393 | 185,108
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 60 | 908
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 277,936 | 449,212
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 38,048 | 44,200
Total investments with an unrealized loss, fair value | 515,329 | 634,320
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 38,108 | 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 | 69,306 | 42,207
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 342 | 254
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 21,427 | 122,469
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 356 | 10,026
Total investments with an unrealized loss, fair value | 90,733 | 164,676
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 698 | 10,280
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 133,135 | 12,679
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,286 | 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 261,337 | 403,882
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 30,130 | 41,355
Total investments with an unrealized loss, fair value | 394,472 | 416,561
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | $ 32,416 | $ 41,362

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