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Securities- Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 1,670,744 | $ 407,150
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 21,564 | 4,277
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 384,332 | 464,283
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 8,357 | 13,560
Total investments with an unrealized loss, fair value | 2,055,076 | 871,433
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 29,921 | 17,837
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 132,157 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 230 | 0
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 | 132,157 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 230 | 0
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 | 195,921 | 9,962
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,552 | 38
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 14,807 | 6,091
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 440 | 22
Total investments with an unrealized loss, fair value | 210,728 | 16,053
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 2,992 | 60
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 633,938 | 165,696
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 8,630 | 1,772
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 114,968 | 35,997
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,270 | 555
Total investments with an unrealized loss, fair value | 748,906 | 201,693
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 11,900 | 2,327
State and municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 523,859 | 175,115
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 9,138 | 2,220
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 222,884 | 345,435
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,961 | 10,264
Total investments with an unrealized loss, fair value | 746,743 | 520,550
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 12,099 | 12,484
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 166,457 | 46,399
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 592 | 207
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 6,703 | 52,840
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 141 | 450
Total investments with an unrealized loss, fair value | 173,160 | 99,239
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 733 | 657
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 18,412 | 9,978
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 422 | 40
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 24,970 | 23,920
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,545 | 2,269
Total investments with an unrealized loss, fair value | 43,382 | 33,898
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | $ 1,967 | $ 2,309

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