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Securities- Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 2,311,866 | $ 1,800,502
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 112,082 | 20,878
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 391,433 | 317,275
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 28,865 | 11,808
Total investments with an unrealized loss, fair value | 2,703,299 | 2,117,777
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 140,947 | 32,686
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 81,164 | 178,610
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 150 | 881
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 | 81,164 | 178,610
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 150 | 881
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 | 400,351 | 353,951
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 14,124 | 2,987
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 29,597 | 54,266
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,107 | 1,974
Total investments with an unrealized loss, fair value | 429,948 | 408,217
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 16,231 | 4,961
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,205,002 | 744,996
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 60,486 | 11,663
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 224,667 | 178,956
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 23,453 | 6,647
Total investments with an unrealized loss, fair value | 1,429,669 | 923,952
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 83,939 | 18,310
State and municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 420,842 | 309,605
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 25,798 | 2,198
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 112,468 | 57,270
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 811 | 1,045
Total investments with an unrealized loss, fair value | 533,310 | 366,875
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 26,609 | 3,243
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 161,788 | 198,349
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 9,684 | 2,595
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 4,591 | 6,513
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 304 | 190
Total investments with an unrealized loss, fair value | 166,379 | 204,862
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 9,988 | 2,785
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 42,719 | 14,991
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,840 | 554
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 20,110 | 20,270
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,190 | 1,952
Total investments with an unrealized loss, fair value | 62,829 | 35,261
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | $ 4,030 | $ 2,506

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