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Securities - Schedule of Available-for-sale Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-sale securities |  |
Fair Value, Less than 12 Months | $ 1,151,338 | $ 1,095,830
Unrealized Losses, Less than 12 Months | 84,404 | 20,921
Fair Value, 12 Months or Longer | 693,287 | 394,300
Unrealized Losses, 12 Months or Longer | 99,044 | 11,982
Fair Value | 1,844,625 | 1,490,130
Unrealized Losses | 183,448 | 32,903
U.S. Treasuries |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 169,550 | 147,810
Unrealized Losses, Less than 12 Months | 16,547 | 2,542
Fair Value, 12 Months or Longer | 4,552 | 0
Unrealized Losses, 12 Months or Longer | 402 | 0
Fair Value | 174,102 | 147,810
Unrealized Losses | 16,949 | 2,542
Obligations of U.S. Government sponsored entities |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 353,414 | 362,895
Unrealized Losses, Less than 12 Months | 23,720 | 6,694
Fair Value, 12 Months or Longer | 411,422 | 289,210
Unrealized Losses, 12 Months or Longer | 46,058 | 8,678
Fair Value | 764,836 | 652,105
Unrealized Losses | 69,778 | 15,372
Obligations of U.S. states and political subdivisions |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 71,476 | 9,700
Unrealized Losses, Less than 12 Months | 6,901 | 85
Fair Value, 12 Months or Longer | 3,123 | 1,283
Unrealized Losses, 12 Months or Longer | 736 | 15
Fair Value | 74,599 | 10,983
Unrealized Losses | 7,637 | 100
U.S. Government agencies |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 36,509 | 22,074
Unrealized Losses, Less than 12 Months | 1,299 | 160
Fair Value, 12 Months or Longer | 21,389 | 16,846
Unrealized Losses, 12 Months or Longer | 2,810 | 372
Fair Value | 57,898 | 38,920
Unrealized Losses | 4,109 | 532
U.S. Government sponsored entities |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 520,389 | 553,351
Unrealized Losses, Less than 12 Months | 35,937 | 11,440
Fair Value, 12 Months or Longer | 250,441 | 84,537
Unrealized Losses, 12 Months or Longer | 48,898 | 2,841
Fair Value | 770,830 | 637,888
Unrealized Losses | 84,835 | 14,281
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 | 2,360 | 2,424
Unrealized Losses, 12 Months or Longer | 140 | 76
Fair Value | 2,360 | 2,424
Unrealized Losses | $ 140 | $ 76

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