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Securities - Schedule of Available-for-sale Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Available-for-sale securities |  |
Fair Value, Less than 12 Months | $ 1,123,328 | $ 417,782
Unrealized Losses, Less than 12 Months | 16,600 | 3,014
Fair Value, 12 Months or Longer | 315,534 | 9,266
Unrealized Losses, 12 Months or Longer | 6,992 | 460
Fair Value | 1,438,862 | 427,048
Unrealized Losses | 23,592 | 3,474
U.S. Treasuries |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 137,935 |
Unrealized Losses, Less than 12 Months | 1,447 |
Fair Value, 12 Months or Longer | 0 |
Unrealized Losses, 12 Months or Longer | 0 |
Fair Value | 137,935 |
Unrealized Losses | 1,447 |
Obligations of U.S. Government sponsored entities |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 326,852 | 310,711
Unrealized Losses, Less than 12 Months | 3,879 | 1,992
Fair Value, 12 Months or Longer | 276,710 | 0
Unrealized Losses, 12 Months or Longer | 5,612 | 0
Fair Value | 603,562 | 310,711
Unrealized Losses | 9,491 | 1,992
Obligations of U.S. states and political subdivisions |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 14,192 | 8,868
Unrealized Losses, Less than 12 Months | 126 | 40
Fair Value, 12 Months or Longer | 1,281 | 0
Unrealized Losses, 12 Months or Longer | 19 | 0
Fair Value | 15,473 | 8,868
Unrealized Losses | 145 | 40
U.S. Government agencies |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 34,808 | 10,560
Unrealized Losses, Less than 12 Months | 405 | 396
Fair Value, 12 Months or Longer | 1,285 | 1,819
Unrealized Losses, 12 Months or Longer | 17 | 250
Fair Value | 36,093 | 12,379
Unrealized Losses | 422 | 646
U.S. Government sponsored entities |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 609,541 | 87,643
Unrealized Losses, Less than 12 Months | 10,743 | 586
Fair Value, 12 Months or Longer | 33,837 | 5,068
Unrealized Losses, 12 Months or Longer | 1,265 | 89
Fair Value | 643,378 | 92,711
Unrealized Losses | 12,008 | 675
U.S. corporate debt securities |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 0 | 0
Unrealized Losses, Less than 12 Months | 0 | 0
Fair Value, 12 Months or Longer | 2,421 | 2,379
Unrealized Losses, 12 Months or Longer | 79 | 121
Fair Value | 2,421 | 2,379
Unrealized Losses | $ 79 | $ 121

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