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Securities- Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 652,209 | $ 1,456,921
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 9,858 | 77,421
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,072,985 | 1,550,911
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 278,334 | 248,005
Total investments with an unrealized loss, fair value | 2,725,194 | 3,007,832
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 288,192 | 325,426
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 26,629 | 192,188
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 131 | 1,963
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 175,219 | 1,997
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 945 | 4
Total investments with an unrealized loss, fair value | 201,848 | 194,185
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 1,076 | 1,967
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 | 26,524 | 46,062
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 225 | 2,224
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 255,530 | 350,094
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 25,159 | 34,094
Total investments with an unrealized loss, fair value | 282,054 | 396,156
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 25,384 | 36,318
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 73,079 | 390,014
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,031 | 34,106
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 849,254 | 570,601
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 136,568 | 109,477
Total investments with an unrealized loss, fair value | 922,333 | 960,615
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 138,599 | 143,583
State and municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 422,950 | 568,691
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 5,014 | 18,863
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 301,326 | 304,451
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 53,812 | 59,694
Total investments with an unrealized loss, fair value | 724,276 | 873,142
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 58,826 | 78,557
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 44,924 | 513
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,013 | 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 116,573 | 116,442
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 14,755 | 16,978
Total investments with an unrealized loss, fair value | 161,497 | 116,955
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 15,768 | 16,983
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 58,103 | 259,453
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,444 | 20,260
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 375,083 | 207,326
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 47,095 | 27,758
Total investments with an unrealized loss, fair value | 433,186 | 466,779
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | $ 48,539 | $ 48,018

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